opal/libltdl/ltdl.c

   1 /* ltdl.c -- system independent dlopen wrapper
   2    Copyright (C) 1998, 1999, 2000, 2004  Free Software Foundation, Inc.
   3    Originally by Thomas Tanner <tanner@ffii.org>
   4    This file is part of GNU Libtool.
   5
   6 This library is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU Lesser General Public
   8 License as published by the Free Software Foundation; either
   9 version 2 of the License, or (at your option) any later version.
  10
  11 As a special exception to the GNU Lesser General Public License,
  12 if you distribute this file as part of a program or library that
  13 is built using GNU libtool, you may include it under the same
  14 distribution terms that you use for the rest of that program.
  15
  16 This library is distributed in the hope that it will be useful,
  17 but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19 Lesser General Public License for more details.
  20
  21 You should have received a copy of the GNU Lesser General Public
  22 License along with this library; if not, write to the Free Software
  23 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  24 02110-1301  USA
  25
  26 */
  27
  28 #if HAVE_CONFIG_H
  29 #  include <config.h>
  30 #endif
  31
  32 #if HAVE_UNISTD_H
  33 #  include <unistd.h>
  34 #endif
  35
  36 #if HAVE_STDIO_H
  37 #  include <stdio.h>
  38 #endif
  39
  40 /* Include the header defining malloc.  On K&R C compilers,
  41    that's <malloc.h>, on ANSI C and ISO C compilers, that's <stdlib.h>.  */
  42 #if HAVE_STDLIB_H
  43 #  include <stdlib.h>
  44 #else
  45 #  if HAVE_MALLOC_H
  46 #    include <malloc.h>
  47 #  endif
  48 #endif
  49
  50 #if HAVE_STRING_H
  51 #  include <string.h>
  52 #else
  53 #  if HAVE_STRINGS_H
  54 #    include <strings.h>
  55 #  endif
  56 #endif
  57
  58 #if HAVE_CTYPE_H
  59 #  include <ctype.h>
  60 #endif
  61
  62 #if HAVE_MEMORY_H
  63 #  include <memory.h>
  64 #endif
  65
  66 #if HAVE_ERRNO_H
  67 #  include <errno.h>
  68 #endif
  69
  70
  71 #ifndef __WINDOWS__
  72 #  ifdef __WIN32__
  73 #    define __WINDOWS__
  74 #  endif
  75 #endif
  76
  77
  78 #undef LT_USE_POSIX_DIRENT
  79 #ifdef HAVE_CLOSEDIR
  80 #  ifdef HAVE_OPENDIR
  81 #    ifdef HAVE_READDIR
  82 #      ifdef HAVE_DIRENT_H
  83 #        define LT_USE_POSIX_DIRENT
  84 #      endif /* HAVE_DIRENT_H */
  85 #    endif /* HAVE_READDIR */
  86 #  endif /* HAVE_OPENDIR */
  87 #endif /* HAVE_CLOSEDIR */
  88
  89
  90 #undef LT_USE_WINDOWS_DIRENT_EMULATION
  91 #ifndef LT_USE_POSIX_DIRENT
  92 #  ifdef __WINDOWS__
  93 #    define LT_USE_WINDOWS_DIRENT_EMULATION
  94 #  endif /* __WINDOWS__ */
  95 #endif /* LT_USE_POSIX_DIRENT */
  96
  97
  98 #ifdef LT_USE_POSIX_DIRENT
  99 #  include <dirent.h>
 100 #  define LT_D_NAMLEN(dirent) (strlen((dirent)->d_name))
 101 #else
 102 #  ifdef LT_USE_WINDOWS_DIRENT_EMULATION
 103 #    define LT_D_NAMLEN(dirent) (strlen((dirent)->d_name))
 104 #  else
 105 #    define dirent direct
 106 #    define LT_D_NAMLEN(dirent) ((dirent)->d_namlen)
 107 #    if HAVE_SYS_NDIR_H
 108 #      include <sys/ndir.h>
 109 #    endif
 110 #    if HAVE_SYS_DIR_H
 111 #      include <sys/dir.h>
 112 #    endif
 113 #    if HAVE_NDIR_H
 114 #      include <ndir.h>
 115 #    endif
 116 #  endif
 117 #endif
 118
 119 #if HAVE_ARGZ_H
 120 #  include <argz.h>
 121 #endif
 122
 123 #if HAVE_ASSERT_H
 124 #  include <assert.h>
 125 #else
 126 #  define assert(arg)   ((void) 0)
 127 #endif
 128
 129 #include "ltdl.h"
 130
 131 #if WITH_DMALLOC
 132 #  include <dmalloc.h>
 133 #endif
 134
 135
 136
 137 \f
 138 /* --- WINDOWS SUPPORT --- */
 139
 140
 141 #ifdef DLL_EXPORT
 142 #  define LT_GLOBAL_DATA        __declspec(dllexport)
 143 #else
 144 #  define LT_GLOBAL_DATA
 145 #endif
 146
 147 /* fopen() mode flags for reading a text file */
 148 #undef  LT_READTEXT_MODE
 149 #ifdef __WINDOWS__
 150 #  define LT_READTEXT_MODE "rt"
 151 #else
 152 #  define LT_READTEXT_MODE "r"
 153 #endif
 154
 155 #ifdef LT_USE_WINDOWS_DIRENT_EMULATION
 156
 157 #include <windows.h>
 158
 159 #define dirent lt_dirent
 160 #define DIR lt_DIR
 161
 162 struct dirent
 163 {
 164   char d_name[2048];
 165   int  d_namlen;
 166 };
 167
 168 typedef struct _DIR
 169 {
 170   HANDLE hSearch;
 171   WIN32_FIND_DATA Win32FindData;
 172   BOOL firsttime;
 173   struct dirent file_info;
 174 } DIR;
 175
 176 #endif /* LT_USE_WINDOWS_DIRENT_EMULATION */
 177
 178 \f
 179 /* --- MANIFEST CONSTANTS --- */
 180
 181
 182 /* Standard libltdl search path environment variable name  */
 183 #undef  LTDL_SEARCHPATH_VAR
 184 #define LTDL_SEARCHPATH_VAR     "LTDL_LIBRARY_PATH"
 185
 186 /* Standard libtool archive file extension.  */
 187 #undef  LTDL_ARCHIVE_EXT
 188 #define LTDL_ARCHIVE_EXT        ".la"
 189
 190 /* max. filename length */
 191 #ifndef LT_FILENAME_MAX
 192 #  define LT_FILENAME_MAX       1024
 193 #endif
 194
 195 /* This is the maximum symbol size that won't require malloc/free */
 196 #undef  LT_SYMBOL_LENGTH
 197 #define LT_SYMBOL_LENGTH        128
 198
 199 /* This accounts for the _LTX_ separator */
 200 #undef  LT_SYMBOL_OVERHEAD
 201 #define LT_SYMBOL_OVERHEAD      5
 202
 203
 204
 205 \f
 206 /* --- MEMORY HANDLING --- */
 207
 208
 209 /* These are the functions used internally.  In addition to making
 210    use of the associated function pointers above, they also perform
 211    error handling.  */
 212 static char   *lt_estrdup       LT_PARAMS((const char *str));
 213 static lt_ptr lt_emalloc        LT_PARAMS((size_t size));
 214 static lt_ptr lt_erealloc       LT_PARAMS((lt_ptr addr, size_t size));
 215
 216 /* static lt_ptr rpl_realloc    LT_PARAMS((lt_ptr ptr, size_t size)); */
 217 #define rpl_realloc realloc
 218
 219 /* These are the pointers that can be changed by the caller:  */
 220 LT_GLOBAL_DATA lt_ptr (*lt_dlmalloc)    LT_PARAMS((size_t size))
 221                         = (lt_ptr (*) LT_PARAMS((size_t))) malloc;
 222 LT_GLOBAL_DATA lt_ptr (*lt_dlrealloc)   LT_PARAMS((lt_ptr ptr, size_t size))
 223                         = (lt_ptr (*) LT_PARAMS((lt_ptr, size_t))) rpl_realloc;
 224 LT_GLOBAL_DATA void   (*lt_dlfree)      LT_PARAMS((lt_ptr ptr))
 225                         = (void (*) LT_PARAMS((lt_ptr))) free;
 226
 227 /* The following macros reduce the amount of typing needed to cast
 228    assigned memory.  */
 229 #if WITH_DMALLOC
 230
 231 #define LT_DLMALLOC(tp, n)      ((tp *) xmalloc ((n) * sizeof(tp)))
 232 #define LT_DLREALLOC(tp, p, n)  ((tp *) xrealloc ((p), (n) * sizeof(tp)))
 233 #define LT_DLFREE(p)                                            \
 234         LT_STMT_START { if (p) (p) = (xfree (p), (lt_ptr) 0); } LT_STMT_END
 235
 236 #define LT_EMALLOC(tp, n)       ((tp *) xmalloc ((n) * sizeof(tp)))
 237 #define LT_EREALLOC(tp, p, n)   ((tp *) xrealloc ((p), (n) * sizeof(tp)))
 238
 239 #else
 240
 241 #define LT_DLMALLOC(tp, n)      ((tp *) lt_dlmalloc ((n) * sizeof(tp)))
 242 #define LT_DLREALLOC(tp, p, n)  ((tp *) lt_dlrealloc ((p), (n) * sizeof(tp)))
 243 #define LT_DLFREE(p)                                            \
 244         LT_STMT_START { if (p) (p) = (lt_dlfree (p), (lt_ptr) 0); } LT_STMT_END
 245
 246 #define LT_EMALLOC(tp, n)       ((tp *) lt_emalloc ((n) * sizeof(tp)))
 247 #define LT_EREALLOC(tp, p, n)   ((tp *) lt_erealloc ((p), (n) * sizeof(tp)))
 248
 249 #endif
 250
 251 #define LT_DLMEM_REASSIGN(p, q)                 LT_STMT_START { \
 252         if ((p) != (q)) { if (p) lt_dlfree (p); (p) = (q); (q) = 0; }   \
 253                                                 } LT_STMT_END
 254
 255 \f
 256 /* --- REPLACEMENT FUNCTIONS --- */
 257
 258
 259 #undef strdup
 260 #define strdup rpl_strdup
 261
 262 static char *strdup LT_PARAMS((const char *str));
 263
 264 static char *
 265 strdup(str)
 266      const char *str;
 267 {
 268   char *tmp = 0;
 269
 270   if (str)
 271     {
 272       tmp = LT_DLMALLOC (char, 1+ strlen (str));
 273       if (tmp)
 274         {
 275           strcpy(tmp, str);
 276         }
 277     }
 278
 279   return tmp;
 280 }
 281
 282
 283 #if ! HAVE_STRCMP
 284
 285 #undef strcmp
 286 #define strcmp rpl_strcmp
 287
 288 static int strcmp LT_PARAMS((const char *str1, const char *str2));
 289
 290 static int
 291 strcmp (str1, str2)
 292      const char *str1;
 293      const char *str2;
 294 {
 295   if (str1 == str2)
 296     return 0;
 297   if (str1 == 0)
 298     return -1;
 299   if (str2 == 0)
 300     return 1;
 301
 302   for (;*str1 && *str2; ++str1, ++str2)
 303     {
 304       if (*str1 != *str2)
 305         break;
 306     }
 307
 308   return (int)(*str1 - *str2);
 309 }
 310 #endif
 311
 312
 313 #if ! HAVE_STRCHR
 314
 315 #  if HAVE_INDEX
 316 #    define strchr index
 317 #  else
 318 #    define strchr rpl_strchr
 319
 320 static const char *strchr LT_PARAMS((const char *str, int ch));
 321
 322 static const char*
 323 strchr(str, ch)
 324      const char *str;
 325      int ch;
 326 {
 327   const char *p;
 328
 329   for (p = str; *p != (char)ch && *p != LT_EOS_CHAR; ++p)
 330     /*NOWORK*/;
 331
 332   return (*p == (char)ch) ? p : 0;
 333 }
 334
 335 #  endif
 336 #endif /* !HAVE_STRCHR */
 337
 338
 339 #if ! HAVE_STRRCHR
 340
 341 #  if HAVE_RINDEX
 342 #    define strrchr rindex
 343 #  else
 344 #    define strrchr rpl_strrchr
 345
 346 static const char *strrchr LT_PARAMS((const char *str, int ch));
 347
 348 static const char*
 349 strrchr(str, ch)
 350      const char *str;
 351      int ch;
 352 {
 353   const char *p, *q = 0;
 354
 355   for (p = str; *p != LT_EOS_CHAR; ++p)
 356     {
 357       if (*p == (char) ch)
 358         {
 359           q = p;
 360         }
 361     }
 362
 363   return q;
 364 }
 365
 366 # endif
 367 #endif
 368
 369 /* NOTE:  Neither bcopy nor the memcpy implementation below can
 370           reliably handle copying in overlapping areas of memory.  Use
 371           memmove (for which there is a fallback implmentation below)
 372           if you need that behaviour.  */
 373 #if ! HAVE_MEMCPY
 374
 375 #  if HAVE_BCOPY
 376 #    define memcpy(dest, src, size)     bcopy (src, dest, size)
 377 #  else
 378 #    define memcpy rpl_memcpy
 379
 380 static lt_ptr memcpy LT_PARAMS((lt_ptr dest, const lt_ptr src, size_t size));
 381
 382 static lt_ptr
 383 memcpy (dest, src, size)
 384      lt_ptr dest;
 385      const lt_ptr src;
 386      size_t size;
 387 {
 388   const char *  s = src;
 389   char *        d = dest;
 390   size_t        i = 0;
 391
 392   for (i = 0; i < size; ++i)
 393     {
 394       d[i] = s[i];
 395     }
 396
 397   return dest;
 398 }
 399
 400 #  endif /* !HAVE_BCOPY */
 401 #endif   /* !HAVE_MEMCPY */
 402
 403 #if ! HAVE_MEMMOVE
 404 #  define memmove rpl_memmove
 405
 406 static lt_ptr memmove LT_PARAMS((lt_ptr dest, const lt_ptr src, size_t size));
 407
 408 static lt_ptr
 409 memmove (dest, src, size)
 410      lt_ptr dest;
 411      const lt_ptr src;
 412      size_t size;
 413 {
 414   const char *  s = src;
 415   char *        d = dest;
 416   size_t        i;
 417
 418   if (d < s)
 419     for (i = 0; i < size; ++i)
 420       {
 421         d[i] = s[i];
 422       }
 423   else if (d > s && size > 0)
 424     for (i = size -1; ; --i)
 425       {
 426         d[i] = s[i];
 427         if (i == 0)
 428           break;
 429       }
 430
 431   return dest;
 432 }
 433
 434 #endif /* !HAVE_MEMMOVE */
 435
 436 #ifdef LT_USE_WINDOWS_DIRENT_EMULATION
 437
 438 static void closedir LT_PARAMS((DIR *entry));
 439
 440 static void
 441 closedir(entry)
 442   DIR *entry;
 443 {
 444   assert(entry != (DIR *) NULL);
 445   FindClose(entry->hSearch);
 446   lt_dlfree((lt_ptr)entry);
 447 }
 448
 449
 450 static DIR * opendir LT_PARAMS((const char *path));
 451
 452 static DIR*
 453 opendir (path)
 454   const char *path;
 455 {
 456   char file_specification[LT_FILENAME_MAX];
 457   DIR *entry;
 458
 459   assert(path != (char *) NULL);
 460   /* allow space for: path + '\\' '\\' '*' '.' '*' + '\0' */
 461   (void) strncpy (file_specification, path, LT_FILENAME_MAX-6);
 462   file_specification[LT_FILENAME_MAX-6] = LT_EOS_CHAR;
 463   (void) strcat(file_specification,"\\");
 464   entry = LT_DLMALLOC (DIR,sizeof(DIR));
 465   if (entry != (DIR *) 0)
 466     {
 467       entry->firsttime = TRUE;
 468       entry->hSearch = FindFirstFile(file_specification,&entry->Win32FindData);
 469     }
 470   if (entry->hSearch == INVALID_HANDLE_VALUE)
 471     {
 472       (void) strcat(file_specification,"\\*.*");
 473       entry->hSearch = FindFirstFile(file_specification,&entry->Win32FindData);
 474       if (entry->hSearch == INVALID_HANDLE_VALUE)
 475         {
 476           LT_DLFREE (entry);
 477           return (DIR *) 0;
 478         }
 479     }
 480   return(entry);
 481 }
 482
 483
 484 static struct dirent *readdir LT_PARAMS((DIR *entry));
 485
 486 static struct dirent *readdir(entry)
 487   DIR *entry;
 488 {
 489   int
 490     status;
 491
 492   if (entry == (DIR *) 0)
 493     return((struct dirent *) 0);
 494   if (!entry->firsttime)
 495     {
 496       status = FindNextFile(entry->hSearch,&entry->Win32FindData);
 497       if (status == 0)
 498         return((struct dirent *) 0);
 499     }
 500   entry->firsttime = FALSE;
 501   (void) strncpy(entry->file_info.d_name,entry->Win32FindData.cFileName,
 502     LT_FILENAME_MAX-1);
 503   entry->file_info.d_name[LT_FILENAME_MAX - 1] = LT_EOS_CHAR;
 504   entry->file_info.d_namlen = strlen(entry->file_info.d_name);
 505   return(&entry->file_info);
 506 }
 507
 508 #endif /* LT_USE_WINDOWS_DIRENT_EMULATION */
 509
 510 /* According to Alexandre Oliva <oliva@lsd.ic.unicamp.br>,
 511     ``realloc is not entirely portable''
 512    In any case we want to use the allocator supplied by the user without
 513    burdening them with an lt_dlrealloc function pointer to maintain.
 514    Instead implement our own version (with known boundary conditions)
 515    using lt_dlmalloc and lt_dlfree. */
 516
 517 /* #undef realloc
 518    #define realloc rpl_realloc
 519 */
 520 #if 0
 521   /* You can't (re)define realloc unless you also (re)define malloc.
 522      Right now, this code uses the size of the *destination* to decide
 523      how much to copy.  That's not right, but you can't know the size
 524      of the source unless you know enough about, or wrote malloc.  So
 525      this code is disabled... */
 526
 527 static lt_ptr
 528 realloc (ptr, size)
 529      lt_ptr ptr;
 530      size_t size;
 531 {
 532   if (size == 0)
 533     {
 534       /* For zero or less bytes, free the original memory */
 535       if (ptr != 0)
 536         {
 537           lt_dlfree (ptr);
 538         }
 539
 540       return (lt_ptr) 0;
 541     }
 542   else if (ptr == 0)
 543     {
 544       /* Allow reallocation of a NULL pointer.  */
 545       return lt_dlmalloc (size);
 546     }
 547   else
 548     {
 549       /* Allocate a new block, copy and free the old block.  */
 550       lt_ptr mem = lt_dlmalloc (size);
 551
 552       if (mem)
 553         {
 554           memcpy (mem, ptr, size);
 555           lt_dlfree (ptr);
 556         }
 557
 558       /* Note that the contents of PTR are not damaged if there is
 559          insufficient memory to realloc.  */
 560       return mem;
 561     }
 562 }
 563 #endif
 564
 565
 566 #if ! HAVE_ARGZ_APPEND
 567 #  define argz_append rpl_argz_append
 568
 569 static error_t argz_append LT_PARAMS((char **pargz, size_t *pargz_len,
 570                                         const char *buf, size_t buf_len));
 571
 572 static error_t
 573 argz_append (pargz, pargz_len, buf, buf_len)
 574      char **pargz;
 575      size_t *pargz_len;
 576      const char *buf;
 577      size_t buf_len;
 578 {
 579   size_t argz_len;
 580   char  *argz;
 581
 582   assert (pargz);
 583   assert (pargz_len);
 584   assert ((*pargz && *pargz_len) || (!*pargz && !*pargz_len));
 585
 586   /* If nothing needs to be appended, no more work is required.  */
 587   if (buf_len == 0)
 588     return 0;
 589
 590   /* Ensure there is enough room to append BUF_LEN.  */
 591   argz_len = *pargz_len + buf_len;
 592   argz = LT_DLREALLOC (char, *pargz, argz_len);
 593   if (!argz)
 594     return ENOMEM;
 595
 596   /* Copy characters from BUF after terminating '\0' in ARGZ.  */
 597   memcpy (argz + *pargz_len, buf, buf_len);
 598
 599   /* Assign new values.  */
 600   *pargz = argz;
 601   *pargz_len = argz_len;
 602
 603   return 0;
 604 }
 605 #endif /* !HAVE_ARGZ_APPEND */
 606
 607
 608 #if ! HAVE_ARGZ_CREATE_SEP
 609 #  define argz_create_sep rpl_argz_create_sep
 610
 611 static error_t argz_create_sep LT_PARAMS((const char *str, int delim,
 612                                             char **pargz, size_t *pargz_len));
 613
 614 static error_t
 615 argz_create_sep (str, delim, pargz, pargz_len)
 616      const char *str;
 617      int delim;
 618      char **pargz;
 619      size_t *pargz_len;
 620 {
 621   size_t argz_len;
 622   char *argz = 0;
 623
 624   assert (str);
 625   assert (pargz);
 626   assert (pargz_len);
 627
 628   /* Make a copy of STR, but replacing each occurrence of
 629      DELIM with '\0'.  */
 630   argz_len = 1+ LT_STRLEN (str);
 631   if (argz_len)
 632     {
 633       const char *p;
 634       char *q;
 635
 636       argz = LT_DLMALLOC (char, argz_len);
 637       if (!argz)
 638         return ENOMEM;
 639
 640       for (p = str, q = argz; *p != LT_EOS_CHAR; ++p)
 641         {
 642           if (*p == delim)
 643             {
 644               /* Ignore leading delimiters, and fold consecutive
 645                  delimiters in STR into a single '\0' in ARGZ.  */
 646               if ((q > argz) && (q[-1] != LT_EOS_CHAR))
 647                 *q++ = LT_EOS_CHAR;
 648               else
 649                 --argz_len;
 650             }
 651           else
 652             *q++ = *p;
 653         }
 654       /* Copy terminating LT_EOS_CHAR.  */
 655       *q = *p;
 656     }
 657
 658   /* If ARGZ_LEN has shrunk to nothing, release ARGZ's memory.  */
 659   if (!argz_len)
 660     LT_DLFREE (argz);
 661
 662   /* Assign new values.  */
 663   *pargz = argz;
 664   *pargz_len = argz_len;
 665
 666   return 0;
 667 }
 668 #endif /* !HAVE_ARGZ_CREATE_SEP */
 669
 670
 671 #if ! HAVE_ARGZ_INSERT
 672 #  define argz_insert rpl_argz_insert
 673
 674 static error_t argz_insert LT_PARAMS((char **pargz, size_t *pargz_len,
 675                                         char *before, const char *entry));
 676
 677 static error_t
 678 argz_insert (pargz, pargz_len, before, entry)
 679      char **pargz;
 680      size_t *pargz_len;
 681      char *before;
 682      const char *entry;
 683 {
 684   assert (pargz);
 685   assert (pargz_len);
 686   assert (entry && *entry);
 687
 688   /* No BEFORE address indicates ENTRY should be inserted after the
 689      current last element.  */
 690   if (!before)
 691     return argz_append (pargz, pargz_len, entry, 1+ LT_STRLEN (entry));
 692
 693   /* This probably indicates a programmer error, but to preserve
 694      semantics, scan back to the start of an entry if BEFORE points
 695      into the middle of it.  */
 696   while ((before > *pargz) && (before[-1] != LT_EOS_CHAR))
 697     --before;
 698
 699   {
 700     size_t entry_len    = 1+ LT_STRLEN (entry);
 701     size_t argz_len     = *pargz_len + entry_len;
 702     size_t offset       = before - *pargz;
 703     char   *argz        = LT_DLREALLOC (char, *pargz, argz_len);
 704
 705     if (!argz)
 706       return ENOMEM;
 707
 708     /* Make BEFORE point to the equivalent offset in ARGZ that it
 709        used to have in *PARGZ incase realloc() moved the block.  */
 710     before = argz + offset;
 711
 712     /* Move the ARGZ entries starting at BEFORE up into the new
 713        space at the end -- making room to copy ENTRY into the
 714        resulting gap.  */
 715     memmove (before + entry_len, before, *pargz_len - offset);
 716     memcpy  (before, entry, entry_len);
 717
 718     /* Assign new values.  */
 719     *pargz = argz;
 720     *pargz_len = argz_len;
 721   }
 722
 723   return 0;
 724 }
 725 #endif /* !HAVE_ARGZ_INSERT */
 726
 727
 728 #if ! HAVE_ARGZ_NEXT
 729 #  define argz_next rpl_argz_next
 730
 731 static char *argz_next LT_PARAMS((char *argz, size_t argz_len,
 732                                     const char *entry));
 733
 734 static char *
 735 argz_next (argz, argz_len, entry)
 736      char *argz;
 737      size_t argz_len;
 738      const char *entry;
 739 {
 740   assert ((argz && argz_len) || (!argz && !argz_len));
 741
 742   if (entry)
 743     {
 744       /* Either ARGZ/ARGZ_LEN is empty, or ENTRY points into an address
 745          within the ARGZ vector.  */
 746       assert ((!argz && !argz_len)
 747               || ((argz <= entry) && (entry < (argz + argz_len))));
 748
 749       /* Move to the char immediately after the terminating
 750          '\0' of ENTRY.  */
 751       entry = 1+ strchr (entry, LT_EOS_CHAR);
 752
 753       /* Return either the new ENTRY, or else NULL if ARGZ is
 754          exhausted.  */
 755       return (entry >= argz + argz_len) ? 0 : (char *) entry;
 756     }
 757   else
 758     {
 759       /* This should probably be flagged as a programmer error,
 760          since starting an argz_next loop with the iterator set
 761          to ARGZ is safer.  To preserve semantics, handle the NULL
 762          case by returning the start of ARGZ (if any).  */
 763       if (argz_len > 0)
 764         return argz;
 765       else
 766         return 0;
 767     }
 768 }
 769 #endif /* !HAVE_ARGZ_NEXT */
 770
 771
 772
 773 #if ! HAVE_ARGZ_STRINGIFY
 774 #  define argz_stringify rpl_argz_stringify
 775
 776 static void argz_stringify LT_PARAMS((char *argz, size_t argz_len,
 777                                        int sep));
 778
 779 static void
 780 argz_stringify (argz, argz_len, sep)
 781      char *argz;
 782      size_t argz_len;
 783      int sep;
 784 {
 785   assert ((argz && argz_len) || (!argz && !argz_len));
 786
 787   if (sep)
 788     {
 789       --argz_len;               /* don't stringify the terminating EOS */
 790       while (--argz_len > 0)
 791         {
 792           if (argz[argz_len] == LT_EOS_CHAR)
 793             argz[argz_len] = sep;
 794         }
 795     }
 796 }
 797 #endif /* !HAVE_ARGZ_STRINGIFY */
 798
 799
 800
 801 \f
 802 /* --- TYPE DEFINITIONS -- */
 803
 804
 805 /* This type is used for the array of caller data sets in each handler. */
 806 typedef struct {
 807   lt_dlcaller_id        key;
 808   lt_ptr                data;
 809 } lt_caller_data;
 810
 811
 812
 813 \f
 814 /* --- OPAQUE STRUCTURES DECLARED IN LTDL.H --- */
 815
 816
 817 /* Extract the diagnostic strings from the error table macro in the same
 818    order as the enumerated indices in ltdl.h. */
 819
 820 static const char *lt_dlerror_strings[] =
 821   {
 822 #define LT_ERROR(name, diagnostic)      (diagnostic),
 823     lt_dlerror_table
 824 #undef LT_ERROR
 825
 826     0
 827   };
 828
 829 /* This structure is used for the list of registered loaders. */
 830 struct lt_dlloader {
 831   struct lt_dlloader   *next;
 832   const char           *loader_name;    /* identifying name for each loader */
 833   const char           *sym_prefix;     /* prefix for symbols */
 834   lt_module_open       *module_open;
 835   lt_module_close      *module_close;
 836   lt_find_sym          *find_sym;
 837   lt_dlloader_exit     *dlloader_exit;
 838   lt_user_data          dlloader_data;
 839 };
 840
 841 struct lt_dlhandle_struct {
 842   struct lt_dlhandle_struct   *next;
 843   lt_dlloader          *loader;         /* dlopening interface */
 844   lt_dlinfo             info;
 845   int                   depcount;       /* number of dependencies */
 846   lt_dlhandle          *deplibs;        /* dependencies */
 847   lt_module             module;         /* system module handle */
 848   lt_ptr                system;         /* system specific data */
 849   lt_caller_data       *caller_data;    /* per caller associated data */
 850   int                   flags;          /* various boolean stats */
 851 };
 852
 853 /* Various boolean flags can be stored in the flags field of an
 854    lt_dlhandle_struct... */
 855 #define LT_DLGET_FLAG(handle, flag) (((handle)->flags & (flag)) == (flag))
 856 #define LT_DLSET_FLAG(handle, flag) ((handle)->flags |= (flag))
 857
 858 #define LT_DLRESIDENT_FLAG          (0x01 << 0)
 859 /* ...add more flags here... */
 860
 861 #define LT_DLIS_RESIDENT(handle)    LT_DLGET_FLAG(handle, LT_DLRESIDENT_FLAG)
 862
 863
 864 #define LT_DLSTRERROR(name)     lt_dlerror_strings[LT_CONC(LT_ERROR_,name)]
 865
 866 static  const char      objdir[]                = LTDL_OBJDIR;
 867 static  const char      archive_ext[]           = LTDL_ARCHIVE_EXT;
 868 #ifdef  LTDL_SHLIB_EXT
 869 static  const char      shlib_ext[]             = LTDL_SHLIB_EXT;
 870 #endif
 871 #ifdef  LTDL_SYSSEARCHPATH
 872 static  const char      sys_search_path[]       = LTDL_SYSSEARCHPATH;
 873 #endif
 874
 875
 876
 877 \f
 878 /* --- MUTEX LOCKING --- */
 879
 880
 881 /* Macros to make it easier to run the lock functions only if they have
 882    been registered.  The reason for the complicated lock macro is to
 883    ensure that the stored error message from the last error is not
 884    accidentally erased if the current function doesn't generate an
 885    error of its own.  */
 886 #define LT_DLMUTEX_LOCK()                       LT_STMT_START { \
 887         if (lt_dlmutex_lock_func) (*lt_dlmutex_lock_func)();    \
 888                                                 } LT_STMT_END
 889 #define LT_DLMUTEX_UNLOCK()                     LT_STMT_START { \
 890         if (lt_dlmutex_unlock_func) (*lt_dlmutex_unlock_func)();\
 891                                                 } LT_STMT_END
 892 #define LT_DLMUTEX_SETERROR(errormsg)           LT_STMT_START { \
 893         if (lt_dlmutex_seterror_func)                           \
 894                 (*lt_dlmutex_seterror_func) (errormsg);         \
 895         else    lt_dllast_error = (errormsg);   } LT_STMT_END
 896 #define LT_DLMUTEX_GETERROR(errormsg)           LT_STMT_START { \
 897         if (lt_dlmutex_seterror_func)                           \
 898                 (errormsg) = (*lt_dlmutex_geterror_func) ();    \
 899         else    (errormsg) = lt_dllast_error;   } LT_STMT_END
 900
 901 /* The mutex functions stored here are global, and are necessarily the
 902    same for all threads that wish to share access to libltdl.  */
 903 static  lt_dlmutex_lock     *lt_dlmutex_lock_func     = 0;
 904 static  lt_dlmutex_unlock   *lt_dlmutex_unlock_func   = 0;
 905 static  lt_dlmutex_seterror *lt_dlmutex_seterror_func = 0;
 906 static  lt_dlmutex_geterror *lt_dlmutex_geterror_func = 0;
 907 static  const char          *lt_dllast_error          = 0;
 908
 909
 910 /* Either set or reset the mutex functions.  Either all the arguments must
 911    be valid functions, or else all can be NULL to turn off locking entirely.
 912    The registered functions should be manipulating a static global lock
 913    from the lock() and unlock() callbacks, which needs to be reentrant.  */
 914 int
 915 lt_dlmutex_register (lock, unlock, seterror, geterror)
 916      lt_dlmutex_lock *lock;
 917      lt_dlmutex_unlock *unlock;
 918      lt_dlmutex_seterror *seterror;
 919      lt_dlmutex_geterror *geterror;
 920 {
 921   lt_dlmutex_unlock *old_unlock = unlock;
 922   int                errors     = 0;
 923
 924   /* Lock using the old lock() callback, if any.  */
 925   LT_DLMUTEX_LOCK ();
 926
 927   if ((lock && unlock && seterror && geterror)
 928       || !(lock || unlock || seterror || geterror))
 929     {
 930       lt_dlmutex_lock_func     = lock;
 931       lt_dlmutex_unlock_func   = unlock;
 932       lt_dlmutex_geterror_func = geterror;
 933     }
 934   else
 935     {
 936       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_MUTEX_ARGS));
 937       ++errors;
 938     }
 939
 940   /* Use the old unlock() callback we saved earlier, if any.  Otherwise
 941      record any errors using internal storage.  */
 942   if (old_unlock)
 943     (*old_unlock) ();
 944
 945   /* Return the number of errors encountered during the execution of
 946      this function.  */
 947   return errors;
 948 }
 949
 950
 951
 952 \f
 953 /* --- ERROR HANDLING --- */
 954
 955
 956 static  const char    **user_error_strings      = 0;
 957 static  int             errorcount              = LT_ERROR_MAX;
 958
 959 int
 960 lt_dladderror (diagnostic)
 961      const char *diagnostic;
 962 {
 963   int           errindex = 0;
 964   int           result   = -1;
 965   const char  **temp     = (const char **) 0;
 966
 967   assert (diagnostic);
 968
 969   LT_DLMUTEX_LOCK ();
 970
 971   errindex = errorcount - LT_ERROR_MAX;
 972   temp = LT_EREALLOC (const char *, user_error_strings, 1 + errindex);
 973   if (temp)
 974     {
 975       user_error_strings                = temp;
 976       user_error_strings[errindex]      = diagnostic;
 977       result                            = errorcount++;
 978     }
 979
 980   LT_DLMUTEX_UNLOCK ();
 981
 982   return result;
 983 }
 984
 985 int
 986 lt_dlseterror (errindex)
 987      int errindex;
 988 {
 989   int           errors   = 0;
 990
 991   LT_DLMUTEX_LOCK ();
 992
 993   if (errindex >= errorcount || errindex < 0)
 994     {
 995       /* Ack!  Error setting the error message! */
 996       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_ERRORCODE));
 997       ++errors;
 998     }
 999   else if (errindex < LT_ERROR_MAX)
1000     {
1001       /* No error setting the error message! */
1002       LT_DLMUTEX_SETERROR (lt_dlerror_strings[errindex]);
1003     }
1004   else
1005     {
1006       /* No error setting the error message! */
1007       LT_DLMUTEX_SETERROR (user_error_strings[errindex - LT_ERROR_MAX]);
1008     }
1009
1010   LT_DLMUTEX_UNLOCK ();
1011
1012   return errors;
1013 }
1014
1015 static lt_ptr
1016 lt_emalloc (size)
1017      size_t size;
1018 {
1019   lt_ptr mem = lt_dlmalloc (size);
1020   if (size && !mem)
1021     LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY));
1022   return mem;
1023 }
1024
1025 static lt_ptr
1026 lt_erealloc (addr, size)
1027      lt_ptr addr;
1028      size_t size;
1029 {
1030   lt_ptr mem = lt_dlrealloc (addr, size);
1031   if (size && !mem)
1032     LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY));
1033   return mem;
1034 }
1035
1036 static char *
1037 lt_estrdup (str)
1038      const char *str;
1039 {
1040   char *copy = strdup (str);
1041   if (LT_STRLEN (str) && !copy)
1042     LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY));
1043   return copy;
1044 }
1045
1046
1047
1048 \f
1049 /* --- DLOPEN() INTERFACE LOADER --- */
1050
1051
1052 #if HAVE_LIBDL
1053
1054 /* dynamic linking with dlopen/dlsym */
1055
1056 #if HAVE_DLFCN_H
1057 #  include <dlfcn.h>
1058 #endif
1059
1060 #if HAVE_SYS_DL_H
1061 #  include <sys/dl.h>
1062 #endif
1063
1064 #ifdef RTLD_GLOBAL
1065 #  define LT_GLOBAL             RTLD_GLOBAL
1066 #else
1067 #  ifdef DL_GLOBAL
1068 #    define LT_GLOBAL           DL_GLOBAL
1069 #  endif
1070 #endif /* !RTLD_GLOBAL */
1071 #ifndef LT_GLOBAL
1072 #  define LT_GLOBAL             0
1073 #endif /* !LT_GLOBAL */
1074
1075 /* We may have to define LT_LAZY_OR_NOW in the command line if we
1076    find out it does not work in some platform. */
1077 #ifndef LT_LAZY_OR_NOW
1078 #  ifdef RTLD_LAZY
1079 #    define LT_LAZY_OR_NOW      RTLD_LAZY
1080 #  else
1081 #    ifdef DL_LAZY
1082 #      define LT_LAZY_OR_NOW    DL_LAZY
1083 #    endif
1084 #  endif /* !RTLD_LAZY */
1085 #endif
1086 #ifndef LT_LAZY_OR_NOW
1087 #  ifdef RTLD_NOW
1088 #    define LT_LAZY_OR_NOW      RTLD_NOW
1089 #  else
1090 #    ifdef DL_NOW
1091 #      define LT_LAZY_OR_NOW    DL_NOW
1092 #    endif
1093 #  endif /* !RTLD_NOW */
1094 #endif
1095 #ifndef LT_LAZY_OR_NOW
1096 #  define LT_LAZY_OR_NOW        0
1097 #endif /* !LT_LAZY_OR_NOW */
1098
1099 #if HAVE_DLERROR
1100 #  define DLERROR(arg)  dlerror ()
1101 #else
1102 #  define DLERROR(arg)  LT_DLSTRERROR (arg)
1103 #endif
1104
1105 static lt_module
1106 sys_dl_open (loader_data, filename)
1107      lt_user_data loader_data;
1108      const char *filename;
1109 {
1110   lt_module   module   = dlopen (filename, LT_GLOBAL | LT_LAZY_OR_NOW);
1111
1112   if (!module)
1113     {
1114       LT_DLMUTEX_SETERROR (DLERROR (CANNOT_OPEN));
1115     }
1116
1117   return module;
1118 }
1119
1120 static int
1121 sys_dl_close (loader_data, module)
1122      lt_user_data loader_data;
1123      lt_module module;
1124 {
1125   int errors = 0;
1126
1127   if (dlclose (module) != 0)
1128     {
1129       LT_DLMUTEX_SETERROR (DLERROR (CANNOT_CLOSE));
1130       ++errors;
1131     }
1132
1133   return errors;
1134 }
1135
1136 static lt_ptr
1137 sys_dl_sym (loader_data, module, symbol)
1138      lt_user_data loader_data;
1139      lt_module module;
1140      const char *symbol;
1141 {
1142   lt_ptr address = dlsym (module, symbol);
1143
1144   if (!address)
1145     {
1146       LT_DLMUTEX_SETERROR (DLERROR (SYMBOL_NOT_FOUND));
1147     }
1148
1149   return address;
1150 }
1151
1152 static struct lt_user_dlloader sys_dl =
1153   {
1154 #  ifdef NEED_USCORE
1155     "_",
1156 #  else
1157     0,
1158 #  endif
1159     sys_dl_open, sys_dl_close, sys_dl_sym, 0, 0 };
1160
1161
1162 #endif /* HAVE_LIBDL */
1163
1164
1165 \f
1166 /* --- SHL_LOAD() INTERFACE LOADER --- */
1167
1168 #if HAVE_SHL_LOAD
1169
1170 /* dynamic linking with shl_load (HP-UX) (comments from gmodule) */
1171
1172 #ifdef HAVE_DL_H
1173 #  include <dl.h>
1174 #endif
1175
1176 /* some flags are missing on some systems, so we provide
1177  * harmless defaults.
1178  *
1179  * Mandatory:
1180  * BIND_IMMEDIATE  - Resolve symbol references when the library is loaded.
1181  * BIND_DEFERRED   - Delay code symbol resolution until actual reference.
1182  *
1183  * Optionally:
1184  * BIND_FIRST      - Place the library at the head of the symbol search
1185  *                   order.
1186  * BIND_NONFATAL   - The default BIND_IMMEDIATE behavior is to treat all
1187  *                   unsatisfied symbols as fatal.  This flag allows
1188  *                   binding of unsatisfied code symbols to be deferred
1189  *                   until use.
1190  *                   [Perl: For certain libraries, like DCE, deferred
1191  *                   binding often causes run time problems. Adding
1192  *                   BIND_NONFATAL to BIND_IMMEDIATE still allows
1193  *                   unresolved references in situations like this.]
1194  * BIND_NOSTART    - Do not call the initializer for the shared library
1195  *                   when the library is loaded, nor on a future call to
1196  *                   shl_unload().
1197  * BIND_VERBOSE    - Print verbose messages concerning possible
1198  *                   unsatisfied symbols.
1199  *
1200  * hp9000s700/hp9000s800:
1201  * BIND_RESTRICTED - Restrict symbols visible by the library to those
1202  *                   present at library load time.
1203  * DYNAMIC_PATH    - Allow the loader to dynamically search for the
1204  *                   library specified by the path argument.
1205  */
1206
1207 #ifndef DYNAMIC_PATH
1208 #  define DYNAMIC_PATH          0
1209 #endif
1210 #ifndef BIND_RESTRICTED
1211 #  define BIND_RESTRICTED       0
1212 #endif
1213
1214 #define LT_BIND_FLAGS   (BIND_IMMEDIATE | BIND_NONFATAL | DYNAMIC_PATH)
1215
1216 static lt_module
1217 sys_shl_open (loader_data, filename)
1218      lt_user_data loader_data;
1219      const char *filename;
1220 {
1221   static shl_t self = (shl_t) 0;
1222   lt_module module = shl_load (filename, LT_BIND_FLAGS, 0L);
1223
1224   /* Since searching for a symbol against a NULL module handle will also
1225      look in everything else that was already loaded and exported with
1226      the -E compiler flag, we always cache a handle saved before any
1227      modules are loaded.  */
1228   if (!self)
1229     {
1230       lt_ptr address;
1231       shl_findsym (&self, "main", TYPE_UNDEFINED, &address);
1232     }
1233
1234   if (!filename)
1235     {
1236       module = self;
1237     }
1238   else
1239     {
1240       module = shl_load (filename, LT_BIND_FLAGS, 0L);
1241
1242       if (!module)
1243         {
1244           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN));
1245         }
1246     }
1247
1248   return module;
1249 }
1250
1251 static int
1252 sys_shl_close (loader_data, module)
1253      lt_user_data loader_data;
1254      lt_module module;
1255 {
1256   int errors = 0;
1257
1258   if (module && (shl_unload ((shl_t) (module)) != 0))
1259     {
1260       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE));
1261       ++errors;
1262     }
1263
1264   return errors;
1265 }
1266
1267 static lt_ptr
1268 sys_shl_sym (loader_data, module, symbol)
1269      lt_user_data loader_data;
1270      lt_module module;
1271      const char *symbol;
1272 {
1273   lt_ptr address = 0;
1274
1275   /* sys_shl_open should never return a NULL module handle */
1276   if (module == (lt_module) 0)
1277   {
1278     LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
1279   }
1280   else if (!shl_findsym((shl_t*) &module, symbol, TYPE_UNDEFINED, &address))
1281     {
1282       if (!address)
1283         {
1284           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
1285         }
1286     }
1287
1288   return address;
1289 }
1290
1291 static struct lt_user_dlloader sys_shl = {
1292   0, sys_shl_open, sys_shl_close, sys_shl_sym, 0, 0
1293 };
1294
1295 #endif /* HAVE_SHL_LOAD */
1296
1297
1298
1299 \f
1300 /* --- LOADLIBRARY() INTERFACE LOADER --- */
1301
1302 #ifdef __WINDOWS__
1303
1304 /* dynamic linking for Win32 */
1305
1306 #include <windows.h>
1307
1308 /* Forward declaration; required to implement handle search below. */
1309 static lt_dlhandle handles;
1310
1311 static lt_module
1312 sys_wll_open (loader_data, filename)
1313      lt_user_data loader_data;
1314      const char *filename;
1315 {
1316   lt_dlhandle   cur;
1317   lt_module     module     = 0;
1318   const char   *errormsg   = 0;
1319   char         *searchname = 0;
1320   char         *ext;
1321   char          self_name_buf[MAX_PATH];
1322
1323   if (!filename)
1324     {
1325       /* Get the name of main module */
1326       *self_name_buf = 0;
1327       GetModuleFileName (NULL, self_name_buf, sizeof (self_name_buf));
1328       filename = ext = self_name_buf;
1329     }
1330   else
1331     {
1332       ext = strrchr (filename, '.');
1333     }
1334
1335   if (ext)
1336     {
1337       /* FILENAME already has an extension. */
1338       searchname = lt_estrdup (filename);
1339     }
1340   else
1341     {
1342       /* Append a `.' to stop Windows from adding an
1343          implicit `.dll' extension. */
1344       searchname = LT_EMALLOC (char, 2+ LT_STRLEN (filename));
1345       if (searchname)
1346         sprintf (searchname, "%s.", filename);
1347     }
1348   if (!searchname)
1349     return 0;
1350
1351   {
1352     /* Silence dialog from LoadLibrary on some failures.
1353        No way to get the error mode, but to set it,
1354        so set it twice to preserve any previous flags. */
1355     UINT errormode = SetErrorMode(SEM_FAILCRITICALERRORS);
1356     SetErrorMode(errormode | SEM_FAILCRITICALERRORS);
1357
1358 #if defined(__CYGWIN__)
1359     {
1360       char wpath[MAX_PATH];
1361       cygwin_conv_to_full_win32_path (searchname, wpath);
1362       module = LoadLibrary (wpath);
1363     }
1364 #else
1365     module = LoadLibrary (searchname);
1366 #endif
1367
1368     /* Restore the error mode. */
1369     SetErrorMode(errormode);
1370   }
1371
1372   LT_DLFREE (searchname);
1373
1374   /* libltdl expects this function to fail if it is unable
1375      to physically load the library.  Sadly, LoadLibrary
1376      will search the loaded libraries for a match and return
1377      one of them if the path search load fails.
1378
1379      We check whether LoadLibrary is returning a handle to
1380      an already loaded module, and simulate failure if we
1381      find one. */
1382   LT_DLMUTEX_LOCK ();
1383   cur = handles;
1384   while (cur)
1385     {
1386       if (!cur->module)
1387         {
1388           cur = 0;
1389           break;
1390         }
1391
1392       if (cur->module == module)
1393         {
1394           break;
1395         }
1396
1397       cur = cur->next;
1398   }
1399   LT_DLMUTEX_UNLOCK ();
1400
1401   if (cur || !module)
1402     {
1403       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN));
1404       module = 0;
1405     }
1406
1407   return module;
1408 }
1409
1410 static int
1411 sys_wll_close (loader_data, module)
1412      lt_user_data loader_data;
1413      lt_module module;
1414 {
1415   int         errors   = 0;
1416
1417   if (FreeLibrary(module) == 0)
1418     {
1419       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE));
1420       ++errors;
1421     }
1422
1423   return errors;
1424 }
1425
1426 static lt_ptr
1427 sys_wll_sym (loader_data, module, symbol)
1428      lt_user_data loader_data;
1429      lt_module module;
1430      const char *symbol;
1431 {
1432   lt_ptr      address  = GetProcAddress (module, symbol);
1433
1434   if (!address)
1435     {
1436       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
1437     }
1438
1439   return address;
1440 }
1441
1442 static struct lt_user_dlloader sys_wll = {
1443   0, sys_wll_open, sys_wll_close, sys_wll_sym, 0, 0
1444 };
1445
1446 #endif /* __WINDOWS__ */
1447
1448
1449
1450 \f
1451 /* --- LOAD_ADD_ON() INTERFACE LOADER --- */
1452
1453
1454 #ifdef __BEOS__
1455
1456 /* dynamic linking for BeOS */
1457
1458 #include <kernel/image.h>
1459
1460 static lt_module
1461 sys_bedl_open (loader_data, filename)
1462      lt_user_data loader_data;
1463      const char *filename;
1464 {
1465   image_id image = 0;
1466
1467   if (filename)
1468     {
1469       image = load_add_on (filename);
1470     }
1471   else
1472     {
1473       image_info info;
1474       int32 cookie = 0;
1475       if (get_next_image_info (0, &cookie, &info) == B_OK)
1476         image = load_add_on (info.name);
1477     }
1478
1479   if (image <= 0)
1480     {
1481       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN));
1482       image = 0;
1483     }
1484
1485   return (lt_module) image;
1486 }
1487
1488 static int
1489 sys_bedl_close (loader_data, module)
1490      lt_user_data loader_data;
1491      lt_module module;
1492 {
1493   int errors = 0;
1494
1495   if (unload_add_on ((image_id) module) != B_OK)
1496     {
1497       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE));
1498       ++errors;
1499     }
1500
1501   return errors;
1502 }
1503
1504 static lt_ptr
1505 sys_bedl_sym (loader_data, module, symbol)
1506      lt_user_data loader_data;
1507      lt_module module;
1508      const char *symbol;
1509 {
1510   lt_ptr address = 0;
1511   image_id image = (image_id) module;
1512
1513   if (get_image_symbol (image, symbol, B_SYMBOL_TYPE_ANY, address) != B_OK)
1514     {
1515       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
1516       address = 0;
1517     }
1518
1519   return address;
1520 }
1521
1522 static struct lt_user_dlloader sys_bedl = {
1523   0, sys_bedl_open, sys_bedl_close, sys_bedl_sym, 0, 0
1524 };
1525
1526 #endif /* __BEOS__ */
1527
1528
1529
1530 \f
1531 /* --- DLD_LINK() INTERFACE LOADER --- */
1532
1533
1534 #if HAVE_DLD
1535
1536 /* dynamic linking with dld */
1537
1538 #if HAVE_DLD_H
1539 #include <dld.h>
1540 #endif
1541
1542 static lt_module
1543 sys_dld_open (loader_data, filename)
1544      lt_user_data loader_data;
1545      const char *filename;
1546 {
1547   lt_module module = strdup (filename);
1548
1549   if (dld_link (filename) != 0)
1550     {
1551       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN));
1552       LT_DLFREE (module);
1553       module = 0;
1554     }
1555
1556   return module;
1557 }
1558
1559 static int
1560 sys_dld_close (loader_data, module)
1561      lt_user_data loader_data;
1562      lt_module module;
1563 {
1564   int errors = 0;
1565
1566   if (dld_unlink_by_file ((char*)(module), 1) != 0)
1567     {
1568       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE));
1569       ++errors;
1570     }
1571   else
1572     {
1573       LT_DLFREE (module);
1574     }
1575
1576   return errors;
1577 }
1578
1579 static lt_ptr
1580 sys_dld_sym (loader_data, module, symbol)
1581      lt_user_data loader_data;
1582      lt_module module;
1583      const char *symbol;
1584 {
1585   lt_ptr address = dld_get_func (symbol);
1586
1587   if (!address)
1588     {
1589       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
1590     }
1591
1592   return address;
1593 }
1594
1595 static struct lt_user_dlloader sys_dld = {
1596   0, sys_dld_open, sys_dld_close, sys_dld_sym, 0, 0
1597 };
1598
1599 #endif /* HAVE_DLD */
1600
1601 /* --- DYLD() MACOSX/DARWIN INTERFACE LOADER --- */
1602 #if HAVE_DYLD
1603
1604
1605 #if HAVE_MACH_O_DYLD_H
1606 #if !defined(__APPLE_CC__) && !defined(__MWERKS__) && !defined(__private_extern__)
1607 /* Is this correct? Does it still function properly? */
1608 #define __private_extern__ extern
1609 #endif
1610 # include <mach-o/dyld.h>
1611 #endif
1612 #include <mach-o/getsect.h>
1613
1614 /* We have to put some stuff here that isn't in older dyld.h files */
1615 #ifndef ENUM_DYLD_BOOL
1616 # define ENUM_DYLD_BOOL
1617 # undef FALSE
1618 # undef TRUE
1619  enum DYLD_BOOL {
1620     FALSE,
1621     TRUE
1622  };
1623 #endif
1624 #ifndef LC_REQ_DYLD
1625 # define LC_REQ_DYLD 0x80000000
1626 #endif
1627 #ifndef LC_LOAD_WEAK_DYLIB
1628 # define LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD)
1629 #endif
1630 static const struct mach_header * (*ltdl_NSAddImage)(const char *image_name, unsigned long options) = 0;
1631 static NSSymbol (*ltdl_NSLookupSymbolInImage)(const struct mach_header *image,const char *symbolName, unsigned long options) = 0;
1632 static enum DYLD_BOOL (*ltdl_NSIsSymbolNameDefinedInImage)(const struct mach_header *image, const char *symbolName) = 0;
1633 static enum DYLD_BOOL (*ltdl_NSMakePrivateModulePublic)(NSModule module) = 0;
1634
1635 #ifndef NSADDIMAGE_OPTION_NONE
1636 #define NSADDIMAGE_OPTION_NONE                          0x0
1637 #endif
1638 #ifndef NSADDIMAGE_OPTION_RETURN_ON_ERROR
1639 #define NSADDIMAGE_OPTION_RETURN_ON_ERROR               0x1
1640 #endif
1641 #ifndef NSADDIMAGE_OPTION_WITH_SEARCHING
1642 #define NSADDIMAGE_OPTION_WITH_SEARCHING                0x2
1643 #endif
1644 #ifndef NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED
1645 #define NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED         0x4
1646 #endif
1647 #ifndef NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME
1648 #define NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME 0x8
1649 #endif
1650 #ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_BIND
1651 #define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND            0x0
1652 #endif
1653 #ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW
1654 #define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW        0x1
1655 #endif
1656 #ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY
1657 #define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY      0x2
1658 #endif
1659 #ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR
1660 #define NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR 0x4
1661 #endif
1662
1663
1664 static const char *
1665 lt_int_dyld_error(othererror)
1666         char* othererror;
1667 {
1668 /* return the dyld error string, or the passed in error string if none */
1669         NSLinkEditErrors ler;
1670         int lerno;
1671         const char *errstr;
1672         const char *file;
1673         NSLinkEditError(&ler,&lerno,&file,&errstr);
1674         if (!errstr || !strlen(errstr)) errstr = othererror;
1675         return errstr;
1676 }
1677
1678 static const struct mach_header *
1679 lt_int_dyld_get_mach_header_from_nsmodule(module)
1680         NSModule module;
1681 {
1682 /* There should probably be an apple dyld api for this */
1683         int i=_dyld_image_count();
1684         int j;
1685         const char *modname=NSNameOfModule(module);
1686         const struct mach_header *mh=NULL;
1687         if (!modname) return NULL;
1688         for (j = 0; j < i; j++)
1689         {
1690                 if (!strcmp(_dyld_get_image_name(j),modname))
1691                 {
1692                         mh=_dyld_get_image_header(j);
1693                         break;
1694                 }
1695         }
1696         return mh;
1697 }
1698
1699 static const char* lt_int_dyld_lib_install_name(mh)
1700         const struct mach_header *mh;
1701 {
1702 /* NSAddImage is also used to get the loaded image, but it only works if the lib
1703    is installed, for uninstalled libs we need to check the install_names against
1704    each other. Note that this is still broken if DYLD_IMAGE_SUFFIX is set and a
1705    different lib was loaded as a result
1706 */
1707         int j;
1708         struct load_command *lc;
1709         unsigned long offset = sizeof(struct mach_header);
1710         const char* retStr=NULL;
1711         for (j = 0; j < mh->ncmds; j++)
1712         {
1713                 lc = (struct load_command*)(((unsigned long)mh) + offset);
1714                 if (LC_ID_DYLIB == lc->cmd)
1715                 {
1716                         retStr=(char*)(((struct dylib_command*)lc)->dylib.name.offset +
1717                                                                         (unsigned long)lc);
1718                 }
1719                 offset += lc->cmdsize;
1720         }
1721         return retStr;
1722 }
1723
1724 static const struct mach_header *
1725 lt_int_dyld_match_loaded_lib_by_install_name(const char *name)
1726 {
1727         int i=_dyld_image_count();
1728         int j;
1729         const struct mach_header *mh=NULL;
1730         const char *id=NULL;
1731         for (j = 0; j < i; j++)
1732         {
1733                 id=lt_int_dyld_lib_install_name(_dyld_get_image_header(j));
1734                 if ((id) && (!strcmp(id,name)))
1735                 {
1736                         mh=_dyld_get_image_header(j);
1737                         break;
1738                 }
1739         }
1740         return mh;
1741 }
1742
1743 static NSSymbol
1744 lt_int_dyld_NSlookupSymbolInLinkedLibs(symbol,mh)
1745         const char *symbol;
1746         const struct mach_header *mh;
1747 {
1748         /* Safe to assume our mh is good */
1749         int j;
1750         struct load_command *lc;
1751         unsigned long offset = sizeof(struct mach_header);
1752         NSSymbol retSym = 0;
1753         const struct mach_header *mh1;
1754         if ((ltdl_NSLookupSymbolInImage) && NSIsSymbolNameDefined(symbol) )
1755         {
1756                 for (j = 0; j < mh->ncmds; j++)
1757                 {
1758                         lc = (struct load_command*)(((unsigned long)mh) + offset);
1759                         if ((LC_LOAD_DYLIB == lc->cmd) || (LC_LOAD_WEAK_DYLIB == lc->cmd))
1760                         {
1761                                 mh1=lt_int_dyld_match_loaded_lib_by_install_name((char*)(((struct dylib_command*)lc)->dylib.name.offset +
1762                                                                                 (unsigned long)lc));
1763                                 if (!mh1)
1764                                 {
1765                                         /* Maybe NSAddImage can find it */
1766                                         mh1=ltdl_NSAddImage((char*)(((struct dylib_command*)lc)->dylib.name.offset +
1767                                                                                 (unsigned long)lc),
1768                                                                                 NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED +
1769                                                                                 NSADDIMAGE_OPTION_WITH_SEARCHING +
1770                                                                                 NSADDIMAGE_OPTION_RETURN_ON_ERROR );
1771                                 }
1772                                 if (mh1)
1773                                 {
1774                                         retSym = ltdl_NSLookupSymbolInImage(mh1,
1775                                                                                         symbol,
1776                                                                                         NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW
1777                                                                                         | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR
1778                                                                                         );
1779                                         if (retSym) break;
1780                                 }
1781                         }
1782                         offset += lc->cmdsize;
1783                 }
1784         }
1785         return retSym;
1786 }
1787
1788 static int
1789 sys_dyld_init()
1790 {
1791         int retCode = 0;
1792         int err = 0;
1793         if (!_dyld_present()) {
1794                 retCode=1;
1795         }
1796         else {
1797       err = _dyld_func_lookup("__dyld_NSAddImage",(unsigned long*)&ltdl_NSAddImage);
1798       err = _dyld_func_lookup("__dyld_NSLookupSymbolInImage",(unsigned long*)&ltdl_NSLookupSymbolInImage);
1799       err = _dyld_func_lookup("__dyld_NSIsSymbolNameDefinedInImage",(unsigned long*)&ltdl_NSIsSymbolNameDefinedInImage);
1800       err = _dyld_func_lookup("__dyld_NSMakePrivateModulePublic",(unsigned long*)&ltdl_NSMakePrivateModulePublic);
1801     }
1802  return retCode;
1803 }
1804
1805 static lt_module
1806 sys_dyld_open (loader_data, filename)
1807      lt_user_data loader_data;
1808      const char *filename;
1809 {
1810         lt_module   module   = 0;
1811         NSObjectFileImage ofi = 0;
1812         NSObjectFileImageReturnCode ofirc;
1813
1814         if (!filename)
1815                 return (lt_module)-1;
1816         ofirc = NSCreateObjectFileImageFromFile(filename, &ofi);
1817         switch (ofirc)
1818         {
1819                 case NSObjectFileImageSuccess:
1820                         module = NSLinkModule(ofi, filename,
1821                                                 NSLINKMODULE_OPTION_RETURN_ON_ERROR
1822                                                  | NSLINKMODULE_OPTION_PRIVATE
1823                                                  | NSLINKMODULE_OPTION_BINDNOW);
1824                         NSDestroyObjectFileImage(ofi);
1825                         if (module)
1826                                 ltdl_NSMakePrivateModulePublic(module);
1827                         break;
1828                 case NSObjectFileImageInappropriateFile:
1829                     if (ltdl_NSIsSymbolNameDefinedInImage && ltdl_NSLookupSymbolInImage)
1830                     {
1831                                 module = (lt_module)ltdl_NSAddImage(filename, NSADDIMAGE_OPTION_RETURN_ON_ERROR);
1832                                 break;
1833                         }
1834                 default:
1835                         LT_DLMUTEX_SETERROR (lt_int_dyld_error(LT_DLSTRERROR(CANNOT_OPEN)));
1836                         return 0;
1837         }
1838         if (!module) LT_DLMUTEX_SETERROR (lt_int_dyld_error(LT_DLSTRERROR(CANNOT_OPEN)));
1839   return module;
1840 }
1841
1842 static int
1843 sys_dyld_close (loader_data, module)
1844      lt_user_data loader_data;
1845      lt_module module;
1846 {
1847         int retCode = 0;
1848         int flags = 0;
1849         if (module == (lt_module)-1) return 0;
1850 #ifdef __BIG_ENDIAN__
1851         if (((struct mach_header *)module)->magic == MH_MAGIC)
1852 #else
1853     if (((struct mach_header *)module)->magic == MH_CIGAM)
1854 #endif
1855         {
1856           LT_DLMUTEX_SETERROR("Can not close a dylib");
1857           retCode = 1;
1858         }
1859         else
1860         {
1861 #if 1
1862 /* Currently, if a module contains c++ static destructors and it is unloaded, we
1863    get a segfault in atexit(), due to compiler and dynamic loader differences of
1864    opinion, this works around that.
1865 */
1866                 if ((const struct section *)NULL !=
1867                    getsectbynamefromheader(lt_int_dyld_get_mach_header_from_nsmodule(module),
1868                    "__DATA","__mod_term_func"))
1869                 {
1870                         flags += NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED;
1871                 }
1872 #endif
1873 #ifdef __ppc__
1874                         flags += NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES;
1875 #endif
1876                 if (!NSUnLinkModule(module,flags))
1877                 {
1878                         retCode=1;
1879                         LT_DLMUTEX_SETERROR (lt_int_dyld_error(LT_DLSTRERROR(CANNOT_CLOSE)));
1880                 }
1881         }
1882
1883  return retCode;
1884 }
1885
1886 static lt_ptr
1887 sys_dyld_sym (loader_data, module, symbol)
1888      lt_user_data loader_data;
1889      lt_module module;
1890      const char *symbol;
1891 {
1892         lt_ptr address = 0;
1893         NSSymbol *nssym = 0;
1894         void *unused;
1895         const struct mach_header *mh=NULL;
1896         char saveError[256] = "Symbol not found";
1897         if (module == (lt_module)-1)
1898         {
1899                 _dyld_lookup_and_bind(symbol,(unsigned long*)&address,&unused);
1900                 return address;
1901         }
1902 #ifdef __BIG_ENDIAN__
1903         if (((struct mach_header *)module)->magic == MH_MAGIC)
1904 #else
1905     if (((struct mach_header *)module)->magic == MH_CIGAM)
1906 #endif
1907         {
1908             if (ltdl_NSIsSymbolNameDefinedInImage && ltdl_NSLookupSymbolInImage)
1909             {
1910                 mh=module;
1911                         if (ltdl_NSIsSymbolNameDefinedInImage((struct mach_header*)module,symbol))
1912                         {
1913                                 nssym = ltdl_NSLookupSymbolInImage((struct mach_header*)module,
1914                                                                                         symbol,
1915                                                                                         NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW
1916                                                                                         | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR
1917                                                                                         );
1918                         }
1919             }
1920
1921         }
1922   else {
1923         nssym = NSLookupSymbolInModule(module, symbol);
1924         }
1925         if (!nssym)
1926         {
1927                 strncpy(saveError, lt_int_dyld_error(LT_DLSTRERROR(SYMBOL_NOT_FOUND)), 255);
1928                 saveError[255] = 0;
1929                 if (!mh) mh=lt_int_dyld_get_mach_header_from_nsmodule(module);
1930                 nssym = lt_int_dyld_NSlookupSymbolInLinkedLibs(symbol,mh);
1931         }
1932         if (!nssym)
1933         {
1934                 LT_DLMUTEX_SETERROR (saveError);
1935                 return NULL;
1936         }
1937         return NSAddressOfSymbol(nssym);
1938 }
1939
1940 static struct lt_user_dlloader sys_dyld =
1941   { "_", sys_dyld_open, sys_dyld_close, sys_dyld_sym, 0, 0 };
1942
1943
1944 #endif /* HAVE_DYLD */
1945
1946 \f
1947 /* --- DLPREOPEN() INTERFACE LOADER --- */
1948
1949
1950 /* emulate dynamic linking using preloaded_symbols */
1951
1952 typedef struct lt_dlsymlists_t
1953 {
1954   struct lt_dlsymlists_t       *next;
1955   const lt_dlsymlist           *syms;
1956 } lt_dlsymlists_t;
1957
1958 static  const lt_dlsymlist     *default_preloaded_symbols       = 0;
1959 static  lt_dlsymlists_t        *preloaded_symbols               = 0;
1960
1961 static int
1962 presym_init (loader_data)
1963      lt_user_data loader_data;
1964 {
1965   int errors = 0;
1966
1967   LT_DLMUTEX_LOCK ();
1968
1969   preloaded_symbols = 0;
1970   if (default_preloaded_symbols)
1971     {
1972       errors = lt_dlpreload (default_preloaded_symbols);
1973     }
1974
1975   LT_DLMUTEX_UNLOCK ();
1976
1977   return errors;
1978 }
1979
1980 static int
1981 presym_free_symlists ()
1982 {
1983   lt_dlsymlists_t *lists;
1984
1985   LT_DLMUTEX_LOCK ();
1986
1987   lists = preloaded_symbols;
1988   while (lists)
1989     {
1990       lt_dlsymlists_t   *tmp = lists;
1991
1992       lists = lists->next;
1993       LT_DLFREE (tmp);
1994     }
1995   preloaded_symbols = 0;
1996
1997   LT_DLMUTEX_UNLOCK ();
1998
1999   return 0;
2000 }
2001
2002 static int
2003 presym_exit (loader_data)
2004      lt_user_data loader_data;
2005 {
2006   presym_free_symlists ();
2007   return 0;
2008 }
2009
2010 static int
2011 presym_add_symlist (preloaded)
2012      const lt_dlsymlist *preloaded;
2013 {
2014   lt_dlsymlists_t *tmp;
2015   lt_dlsymlists_t *lists;
2016   int              errors   = 0;
2017
2018   LT_DLMUTEX_LOCK ();
2019
2020   lists = preloaded_symbols;
2021   while (lists)
2022     {
2023       if (lists->syms == preloaded)
2024         {
2025           goto done;
2026         }
2027       lists = lists->next;
2028     }
2029
2030   tmp = LT_EMALLOC (lt_dlsymlists_t, 1);
2031   if (tmp)
2032     {
2033       memset (tmp, 0, sizeof(lt_dlsymlists_t));
2034       tmp->syms = preloaded;
2035       tmp->next = preloaded_symbols;
2036       preloaded_symbols = tmp;
2037     }
2038   else
2039     {
2040       ++errors;
2041     }
2042
2043  done:
2044   LT_DLMUTEX_UNLOCK ();
2045   return errors;
2046 }
2047
2048 static lt_module
2049 presym_open (loader_data, filename)
2050      lt_user_data loader_data;
2051      const char *filename;
2052 {
2053   lt_dlsymlists_t *lists;
2054   lt_module        module = (lt_module) 0;
2055
2056   LT_DLMUTEX_LOCK ();
2057   lists = preloaded_symbols;
2058
2059   if (!lists)
2060     {
2061       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_SYMBOLS));
2062       goto done;
2063     }
2064
2065   /* Can't use NULL as the reflective symbol header, as NULL is
2066      used to mark the end of the entire symbol list.  Self-dlpreopened
2067      symbols follow this magic number, chosen to be an unlikely
2068      clash with a real module name.  */
2069   if (!filename)
2070     {
2071       filename = "@PROGRAM@";
2072     }
2073
2074   while (lists)
2075     {
2076       const lt_dlsymlist *syms = lists->syms;
2077
2078       while (syms->name)
2079         {
2080           if (!syms->address && strcmp(syms->name, filename) == 0)
2081             {
2082               module = (lt_module) syms;
2083               goto done;
2084             }
2085           ++syms;
2086         }
2087
2088       lists = lists->next;
2089     }
2090
2091   LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
2092
2093  done:
2094   LT_DLMUTEX_UNLOCK ();
2095   return module;
2096 }
2097
2098 static int
2099 presym_close (loader_data, module)
2100      lt_user_data loader_data;
2101      lt_module module;
2102 {
2103   /* Just to silence gcc -Wall */
2104   module = 0;
2105   return 0;
2106 }
2107
2108 static lt_ptr
2109 presym_sym (loader_data, module, symbol)
2110      lt_user_data loader_data;
2111      lt_module module;
2112      const char *symbol;
2113 {
2114   lt_dlsymlist *syms = (lt_dlsymlist*) module;
2115
2116   ++syms;
2117   while (syms->address)
2118     {
2119       if (strcmp(syms->name, symbol) == 0)
2120         {
2121           return syms->address;
2122         }
2123
2124     ++syms;
2125   }
2126
2127   LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
2128
2129   return 0;
2130 }
2131
2132 static struct lt_user_dlloader presym = {
2133   0, presym_open, presym_close, presym_sym, presym_exit, 0
2134 };
2135
2136
2137
2138
2139 \f
2140 /* --- DYNAMIC MODULE LOADING --- */
2141
2142
2143 /* The type of a function used at each iteration of  foreach_dirinpath().  */
2144 typedef int     foreach_callback_func LT_PARAMS((char *filename, lt_ptr data1,
2145                                                  lt_ptr data2));
2146
2147 static  int     foreach_dirinpath     LT_PARAMS((const char *search_path,
2148                                                  const char *base_name,
2149                                                  foreach_callback_func *func,
2150                                                  lt_ptr data1, lt_ptr data2));
2151
2152 static  int     find_file_callback    LT_PARAMS((char *filename, lt_ptr data,
2153                                                  lt_ptr ignored));
2154 static  int     find_handle_callback  LT_PARAMS((char *filename, lt_ptr data,
2155                                                  lt_ptr ignored));
2156 static  int     foreachfile_callback  LT_PARAMS((char *filename, lt_ptr data1,
2157                                                  lt_ptr data2));
2158
2159
2160 static  int     canonicalize_path     LT_PARAMS((const char *path,
2161                                                  char **pcanonical));
2162 static  int     argzize_path          LT_PARAMS((const char *path,
2163                                                  char **pargz,
2164                                                  size_t *pargz_len));
2165 static  FILE   *find_file             LT_PARAMS((const char *search_path,
2166                                                  const char *base_name,
2167                                                  char **pdir));
2168 static  lt_dlhandle *find_handle      LT_PARAMS((const char *search_path,
2169                                                  const char *base_name,
2170                                                  lt_dlhandle *handle));
2171 static  int     find_module           LT_PARAMS((lt_dlhandle *handle,
2172                                                  const char *dir,
2173                                                  const char *libdir,
2174                                                  const char *dlname,
2175                                                  const char *old_name,
2176                                                  int installed));
2177 static  int     free_vars             LT_PARAMS((char *dlname, char *oldname,
2178                                                  char *libdir, char *deplibs));
2179 static  int     load_deplibs          LT_PARAMS((lt_dlhandle handle,
2180                                                  char *deplibs));
2181 static  int     trim                  LT_PARAMS((char **dest,
2182                                                  const char *str));
2183 static  int     try_dlopen            LT_PARAMS((lt_dlhandle *handle,
2184                                                  const char *filename));
2185 static  int     tryall_dlopen         LT_PARAMS((lt_dlhandle *handle,
2186                                                  const char *filename));
2187 static  int     unload_deplibs        LT_PARAMS((lt_dlhandle handle));
2188 static  int     lt_argz_insert        LT_PARAMS((char **pargz,
2189                                                  size_t *pargz_len,
2190                                                  char *before,
2191                                                  const char *entry));
2192 static  int     lt_argz_insertinorder LT_PARAMS((char **pargz,
2193                                                  size_t *pargz_len,
2194                                                  const char *entry));
2195 static  int     lt_argz_insertdir     LT_PARAMS((char **pargz,
2196                                                  size_t *pargz_len,
2197                                                  const char *dirnam,
2198                                                  struct dirent *dp));
2199 static  int     lt_dlpath_insertdir   LT_PARAMS((char **ppath,
2200                                                  char *before,
2201                                                  const char *dir));
2202 static  int     list_files_by_dir     LT_PARAMS((const char *dirnam,
2203                                                  char **pargz,
2204                                                  size_t *pargz_len));
2205 static  int     file_not_found        LT_PARAMS((void));
2206
2207 static  char           *user_search_path= 0;
2208 static  lt_dlloader    *loaders         = 0;
2209 static  lt_dlhandle     handles         = 0;
2210 static  int             initialized     = 0;
2211
2212 /* Initialize libltdl. */
2213 int
2214 lt_dlinit ()
2215 {
2216   int         errors   = 0;
2217
2218   LT_DLMUTEX_LOCK ();
2219
2220   /* Initialize only at first call. */
2221   if (++initialized == 1)
2222     {
2223       handles = 0;
2224       user_search_path = 0; /* empty search path */
2225
2226 #if HAVE_LIBDL
2227       errors += lt_dlloader_add (lt_dlloader_next (0), &sys_dl, "dlopen");
2228 #endif
2229 #if HAVE_SHL_LOAD
2230       errors += lt_dlloader_add (lt_dlloader_next (0), &sys_shl, "dlopen");
2231 #endif
2232 #ifdef __WINDOWS__
2233       errors += lt_dlloader_add (lt_dlloader_next (0), &sys_wll, "dlopen");
2234 #endif
2235 #ifdef __BEOS__
2236       errors += lt_dlloader_add (lt_dlloader_next (0), &sys_bedl, "dlopen");
2237 #endif
2238 #if HAVE_DLD
2239       errors += lt_dlloader_add (lt_dlloader_next (0), &sys_dld, "dld");
2240 #endif
2241 #if HAVE_DYLD
2242        errors += lt_dlloader_add (lt_dlloader_next (0), &sys_dyld, "dyld");
2243        errors += sys_dyld_init();
2244 #endif
2245       errors += lt_dlloader_add (lt_dlloader_next (0), &presym, "dlpreload");
2246
2247       if (presym_init (presym.dlloader_data))
2248         {
2249           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INIT_LOADER));
2250           ++errors;
2251         }
2252       else if (errors != 0)
2253         {
2254           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (DLOPEN_NOT_SUPPORTED));
2255           ++errors;
2256         }
2257     }
2258
2259   LT_DLMUTEX_UNLOCK ();
2260
2261   return errors;
2262 }
2263
2264 int
2265 lt_dlpreload (preloaded)
2266      const lt_dlsymlist *preloaded;
2267 {
2268   int errors = 0;
2269
2270   if (preloaded)
2271     {
2272       errors = presym_add_symlist (preloaded);
2273     }
2274   else
2275     {
2276       presym_free_symlists();
2277
2278       LT_DLMUTEX_LOCK ();
2279       if (default_preloaded_symbols)
2280         {
2281           errors = lt_dlpreload (default_preloaded_symbols);
2282         }
2283       LT_DLMUTEX_UNLOCK ();
2284     }
2285
2286   return errors;
2287 }
2288
2289 int
2290 lt_dlpreload_default (preloaded)
2291      const lt_dlsymlist *preloaded;
2292 {
2293   LT_DLMUTEX_LOCK ();
2294   default_preloaded_symbols = preloaded;
2295   LT_DLMUTEX_UNLOCK ();
2296   return 0;
2297 }
2298
2299 int
2300 lt_dlexit ()
2301 {
2302   /* shut down libltdl */
2303   lt_dlloader *loader;
2304   int          errors   = 0;
2305
2306   LT_DLMUTEX_LOCK ();
2307   loader = loaders;
2308
2309   if (!initialized)
2310     {
2311       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SHUTDOWN));
2312       ++errors;
2313       goto done;
2314     }
2315
2316   /* shut down only at last call. */
2317   if (--initialized == 0)
2318     {
2319       int       level;
2320
2321       while (handles && LT_DLIS_RESIDENT (handles))
2322         {
2323           handles = handles->next;
2324         }
2325
2326       /* close all modules */
2327       for (level = 1; handles; ++level)
2328         {
2329           lt_dlhandle cur = handles;
2330           int saw_nonresident = 0;
2331
2332           while (cur)
2333             {
2334               lt_dlhandle tmp = cur;
2335               cur = cur->next;
2336               if (!LT_DLIS_RESIDENT (tmp))
2337                 saw_nonresident = 1;
2338               if (!LT_DLIS_RESIDENT (tmp) && tmp->info.ref_count <= level)
2339                 {
2340                   if (lt_dlclose (tmp))
2341                     {
2342                       ++errors;
2343                     }
2344                 }
2345             }
2346           /* done if only resident modules are left */
2347           if (!saw_nonresident)
2348             break;
2349         }
2350
2351       /* close all loaders */
2352       while (loader)
2353         {
2354           lt_dlloader *next = loader->next;
2355           lt_user_data data = loader->dlloader_data;
2356           if (loader->dlloader_exit && loader->dlloader_exit (data))
2357             {
2358               ++errors;
2359             }
2360
2361           LT_DLMEM_REASSIGN (loader, next);
2362         }
2363       loaders = 0;
2364     }
2365
2366  done:
2367   LT_DLMUTEX_UNLOCK ();
2368   return errors;
2369 }
2370
2371 static int
2372 tryall_dlopen (handle, filename)
2373      lt_dlhandle *handle;
2374      const char *filename;
2375 {
2376   lt_dlhandle    cur;
2377   lt_dlloader   *loader;
2378   const char    *saved_error;
2379   int            errors         = 0;
2380
2381   LT_DLMUTEX_GETERROR (saved_error);
2382   LT_DLMUTEX_LOCK ();
2383
2384   cur    = handles;
2385   loader = loaders;
2386
2387   /* check whether the module was already opened */
2388   while (cur)
2389     {
2390       /* try to dlopen the program itself? */
2391       if (!cur->info.filename && !filename)
2392         {
2393           break;
2394         }
2395
2396       if (cur->info.filename && filename
2397           && strcmp (cur->info.filename, filename) == 0)
2398         {
2399           break;
2400         }
2401
2402       cur = cur->next;
2403     }
2404
2405   if (cur)
2406     {
2407       ++cur->info.ref_count;
2408       *handle = cur;
2409       goto done;
2410     }
2411
2412   cur = *handle;
2413   if (filename)
2414     {
2415       /* Comment out the check of file permissions using access.
2416          This call seems to always return -1 with error EACCES.
2417       */
2418       /* We need to catch missing file errors early so that
2419          file_not_found() can detect what happened.
2420       if (access (filename, R_OK) != 0)
2421         {
2422           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
2423           ++errors;
2424           goto done;
2425         } */
2426
2427       cur->info.filename = lt_estrdup (filename);
2428       if (!cur->info.filename)
2429         {
2430           ++errors;
2431           goto done;
2432         }
2433     }
2434   else
2435     {
2436       cur->info.filename = 0;
2437     }
2438
2439   while (loader)
2440     {
2441       lt_user_data data = loader->dlloader_data;
2442
2443       cur->module = loader->module_open (data, filename);
2444
2445       if (cur->module != 0)
2446         {
2447           break;
2448         }
2449       loader = loader->next;
2450     }
2451
2452   if (!loader)
2453     {
2454       LT_DLFREE (cur->info.filename);
2455       ++errors;
2456       goto done;
2457     }
2458
2459   cur->loader   = loader;
2460   LT_DLMUTEX_SETERROR (saved_error);
2461
2462  done:
2463   LT_DLMUTEX_UNLOCK ();
2464
2465   return errors;
2466 }
2467
2468 static int
2469 tryall_dlopen_module (handle, prefix, dirname, dlname)
2470      lt_dlhandle *handle;
2471      const char *prefix;
2472      const char *dirname;
2473      const char *dlname;
2474 {
2475   int      error        = 0;
2476   char     *filename    = 0;
2477   size_t   filename_len = 0;
2478   size_t   dirname_len  = LT_STRLEN (dirname);
2479
2480   assert (handle);
2481   assert (dirname);
2482   assert (dlname);
2483 #ifdef LT_DIRSEP_CHAR
2484   /* Only canonicalized names (i.e. with DIRSEP chars already converted)
2485      should make it into this function:  */
2486   assert (strchr (dirname, LT_DIRSEP_CHAR) == 0);
2487 #endif
2488
2489   if (dirname_len > 0)
2490     if (dirname[dirname_len -1] == '/')
2491       --dirname_len;
2492   filename_len = dirname_len + 1 + LT_STRLEN (dlname);
2493
2494   /* Allocate memory, and combine DIRNAME and MODULENAME into it.
2495      The PREFIX (if any) is handled below.  */
2496   filename  = LT_EMALLOC (char, dirname_len + 1 + filename_len + 1);
2497   if (!filename)
2498     return 1;
2499
2500   sprintf (filename, "%.*s/%s", (int) dirname_len, dirname, dlname);
2501
2502   /* Now that we have combined DIRNAME and MODULENAME, if there is
2503      also a PREFIX to contend with, simply recurse with the arguments
2504      shuffled.  Otherwise, attempt to open FILENAME as a module.  */
2505   if (prefix)
2506     {
2507       error += tryall_dlopen_module (handle,
2508                                      (const char *) 0, prefix, filename);
2509     }
2510   else if (tryall_dlopen (handle, filename) != 0)
2511     {
2512       ++error;
2513     }
2514
2515   LT_DLFREE (filename);
2516   return error;
2517 }
2518
2519 static int
2520 find_module (handle, dir, libdir, dlname, old_name, installed)
2521      lt_dlhandle *handle;
2522      const char *dir;
2523      const char *libdir;
2524      const char *dlname;
2525      const char *old_name;
2526      int installed;
2527 {
2528   /* Try to open the old library first; if it was dlpreopened,
2529      we want the preopened version of it, even if a dlopenable
2530      module is available.  */
2531   if (old_name && tryall_dlopen (handle, old_name) == 0)
2532     {
2533       return 0;
2534     }
2535
2536   /* Try to open the dynamic library.  */
2537   if (dlname)
2538     {
2539       /* try to open the installed module */
2540       if (installed && libdir)
2541         {
2542           if (tryall_dlopen_module (handle,
2543                                     (const char *) 0, libdir, dlname) == 0)
2544             return 0;
2545         }
2546
2547       /* try to open the not-installed module */
2548       if (!installed)
2549         {
2550           if (tryall_dlopen_module (handle, dir, objdir, dlname) == 0)
2551             return 0;
2552         }
2553
2554       /* maybe it was moved to another directory */
2555       {
2556           if (tryall_dlopen_module (handle,
2557                                     (const char *) 0, dir, dlname) == 0)
2558             return 0;
2559       }
2560     }
2561
2562   return 1;
2563 }
2564
2565
2566 static int
2567 canonicalize_path (path, pcanonical)
2568      const char *path;
2569      char **pcanonical;
2570 {
2571   char *canonical = 0;
2572
2573   assert (path && *path);
2574   assert (pcanonical);
2575
2576   canonical = LT_EMALLOC (char, 1+ LT_STRLEN (path));
2577   if (!canonical)
2578     return 1;
2579
2580   {
2581     size_t dest = 0;
2582     size_t src;
2583     for (src = 0; path[src] != LT_EOS_CHAR; ++src)
2584       {
2585         /* Path separators are not copied to the beginning or end of
2586            the destination, or if another separator would follow
2587            immediately.  */
2588         if (path[src] == LT_PATHSEP_CHAR)
2589           {
2590             if ((dest == 0)
2591                 || (path[1+ src] == LT_PATHSEP_CHAR)
2592                 || (path[1+ src] == LT_EOS_CHAR))
2593               continue;
2594           }
2595
2596         /* Anything other than a directory separator is copied verbatim.  */
2597         if ((path[src] != '/')
2598 #ifdef LT_DIRSEP_CHAR
2599             && (path[src] != LT_DIRSEP_CHAR)
2600 #endif
2601             )
2602           {
2603             canonical[dest++] = path[src];
2604           }
2605         /* Directory separators are converted and copied only if they are
2606            not at the end of a path -- i.e. before a path separator or
2607            NULL terminator.  */
2608         else if ((path[1+ src] != LT_PATHSEP_CHAR)
2609                  && (path[1+ src] != LT_EOS_CHAR)
2610 #ifdef LT_DIRSEP_CHAR
2611                  && (path[1+ src] != LT_DIRSEP_CHAR)
2612 #endif
2613                  && (path[1+ src] != '/'))
2614           {
2615             canonical[dest++] = '/';
2616           }
2617       }
2618
2619     /* Add an end-of-string marker at the end.  */
2620     canonical[dest] = LT_EOS_CHAR;
2621   }
2622
2623   /* Assign new value.  */
2624   *pcanonical = canonical;
2625
2626   return 0;
2627 }
2628
2629 static int
2630 argzize_path (path, pargz, pargz_len)
2631      const char *path;
2632      char **pargz;
2633      size_t *pargz_len;
2634 {
2635   error_t error;
2636
2637   assert (path);
2638   assert (pargz);
2639   assert (pargz_len);
2640
2641   if ((error = argz_create_sep (path, LT_PATHSEP_CHAR, pargz, pargz_len)))
2642     {
2643       switch (error)
2644         {
2645         case ENOMEM:
2646           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY));
2647           break;
2648         default:
2649           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (UNKNOWN));
2650           break;
2651         }
2652
2653       return 1;
2654     }
2655
2656   return 0;
2657 }
2658
2659 /* Repeatedly call FUNC with each LT_PATHSEP_CHAR delimited element
2660    of SEARCH_PATH and references to DATA1 and DATA2, until FUNC returns
2661    non-zero or all elements are exhausted.  If BASE_NAME is non-NULL,
2662    it is appended to each SEARCH_PATH element before FUNC is called.  */
2663 static int
2664 foreach_dirinpath (search_path, base_name, func, data1, data2)
2665      const char *search_path;
2666      const char *base_name;
2667      foreach_callback_func *func;
2668      lt_ptr data1;
2669      lt_ptr data2;
2670 {
2671   int    result         = 0;
2672   int    filenamesize   = 0;
2673   size_t lenbase        = LT_STRLEN (base_name);
2674   size_t argz_len       = 0;
2675   char *argz            = 0;
2676   char *filename        = 0;
2677   char *canonical       = 0;
2678
2679   LT_DLMUTEX_LOCK ();
2680
2681   if (!search_path || !*search_path)
2682     {
2683       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
2684       goto cleanup;
2685     }
2686
2687   if (canonicalize_path (search_path, &canonical) != 0)
2688     goto cleanup;
2689
2690   if (argzize_path (canonical, &argz, &argz_len) != 0)
2691     goto cleanup;
2692
2693   {
2694     char *dir_name = 0;
2695     while ((dir_name = argz_next (argz, argz_len, dir_name)))
2696       {
2697         size_t lendir = LT_STRLEN (dir_name);
2698
2699         if (lendir +1 +lenbase >= filenamesize)
2700         {
2701           LT_DLFREE (filename);
2702           filenamesize  = lendir +1 +lenbase +1; /* "/d" + '/' + "f" + '\0' */
2703           filename      = LT_EMALLOC (char, filenamesize);
2704           if (!filename)
2705             goto cleanup;
2706         }
2707
2708         assert (filenamesize > lendir);
2709         strcpy (filename, dir_name);
2710
2711         if (base_name && *base_name)
2712           {
2713             if (filename[lendir -1] != '/')
2714               filename[lendir++] = '/';
2715             strcpy (filename +lendir, base_name);
2716           }
2717
2718         if ((result = (*func) (filename, data1, data2)))
2719           {
2720             break;
2721           }
2722       }
2723   }
2724
2725  cleanup:
2726   LT_DLFREE (argz);
2727   LT_DLFREE (canonical);
2728   LT_DLFREE (filename);
2729
2730   LT_DLMUTEX_UNLOCK ();
2731
2732   return result;
2733 }
2734
2735 /* If FILEPATH can be opened, store the name of the directory component
2736    in DATA1, and the opened FILE* structure address in DATA2.  Otherwise
2737    DATA1 is unchanged, but DATA2 is set to a pointer to NULL.  */
2738 static int
2739 find_file_callback (filename, data1, data2)
2740      char *filename;
2741      lt_ptr data1;
2742      lt_ptr data2;
2743 {
2744   char       **pdir     = (char **) data1;
2745   FILE       **pfile    = (FILE **) data2;
2746   int        is_done    = 0;
2747
2748   assert (filename && *filename);
2749   assert (pdir);
2750   assert (pfile);
2751
2752   if ((*pfile = fopen (filename, LT_READTEXT_MODE)))
2753     {
2754       char *dirend = strrchr (filename, '/');
2755
2756       if (dirend > filename)
2757         *dirend   = LT_EOS_CHAR;
2758
2759       LT_DLFREE (*pdir);
2760       *pdir   = lt_estrdup (filename);
2761       is_done = (*pdir == 0) ? -1 : 1;
2762     }
2763
2764   return is_done;
2765 }
2766
2767 static FILE *
2768 find_file (search_path, base_name, pdir)
2769      const char *search_path;
2770      const char *base_name;
2771      char **pdir;
2772 {
2773   FILE *file = 0;
2774
2775   foreach_dirinpath (search_path, base_name, find_file_callback, pdir, &file);
2776
2777   return file;
2778 }
2779
2780 static int
2781 find_handle_callback (filename, data, ignored)
2782      char *filename;
2783      lt_ptr data;
2784      lt_ptr ignored;
2785 {
2786   lt_dlhandle  *handle          = (lt_dlhandle *) data;
2787   int           notfound        = access (filename, R_OK);
2788
2789   /* Bail out if file cannot be read...  */
2790   if (notfound)
2791     return 0;
2792
2793   /* Try to dlopen the file, but do not continue searching in any
2794      case.  */
2795   if (tryall_dlopen (handle, filename) != 0)
2796     *handle = 0;
2797
2798   return 1;
2799 }
2800
2801 /* If HANDLE was found return it, otherwise return 0.  If HANDLE was
2802    found but could not be opened, *HANDLE will be set to 0.  */
2803 static lt_dlhandle *
2804 find_handle (search_path, base_name, handle)
2805      const char *search_path;
2806      const char *base_name;
2807      lt_dlhandle *handle;
2808 {
2809   if (!search_path)
2810     return 0;
2811
2812   if (!foreach_dirinpath (search_path, base_name, find_handle_callback,
2813                           handle, 0))
2814     return 0;
2815
2816   return handle;
2817 }
2818
2819 static int
2820 load_deplibs (handle, deplibs)
2821      lt_dlhandle handle;
2822      char *deplibs;
2823 {
2824 #if LTDL_DLOPEN_DEPLIBS
2825   char  *p, *save_search_path = 0;
2826   int   depcount = 0;
2827   int   i;
2828   char  **names = 0;
2829 #endif
2830   int   errors = 0;
2831
2832   handle->depcount = 0;
2833
2834 #if LTDL_DLOPEN_DEPLIBS
2835   if (!deplibs)
2836     {
2837       return errors;
2838     }
2839   ++errors;
2840
2841   LT_DLMUTEX_LOCK ();
2842   if (user_search_path)
2843     {
2844       save_search_path = lt_estrdup (user_search_path);
2845       if (!save_search_path)
2846         goto cleanup;
2847     }
2848
2849   /* extract search paths and count deplibs */
2850   p = deplibs;
2851   while (*p)
2852     {
2853       if (!isspace ((int) *p))
2854         {
2855           char *end = p+1;
2856           while (*end && !isspace((int) *end))
2857             {
2858               ++end;
2859             }
2860
2861           if (strncmp(p, "-L", 2) == 0 || strncmp(p, "-R", 2) == 0)
2862             {
2863               char save = *end;
2864               *end = 0; /* set a temporary string terminator */
2865               if (lt_dladdsearchdir(p+2))
2866                 {
2867                   goto cleanup;
2868                 }
2869               *end = save;
2870             }
2871           else
2872             {
2873               ++depcount;
2874             }
2875
2876           p = end;
2877         }
2878       else
2879         {
2880           ++p;
2881         }
2882     }
2883
2884   /* restore the old search path */
2885   LT_DLFREE (user_search_path);
2886   user_search_path = save_search_path;
2887
2888   LT_DLMUTEX_UNLOCK ();
2889
2890   if (!depcount)
2891     {
2892       errors = 0;
2893       goto cleanup;
2894     }
2895
2896   names = LT_EMALLOC (char *, depcount * sizeof (char*));
2897   if (!names)
2898     goto cleanup;
2899
2900   /* now only extract the actual deplibs */
2901   depcount = 0;
2902   p = deplibs;
2903   while (*p)
2904     {
2905       if (isspace ((int) *p))
2906         {
2907           ++p;
2908         }
2909       else
2910         {
2911           char *end = p+1;
2912           while (*end && !isspace ((int) *end))
2913             {
2914               ++end;
2915             }
2916
2917           if (strncmp(p, "-L", 2) != 0 && strncmp(p, "-R", 2) != 0)
2918             {
2919               char *name;
2920               char save = *end;
2921               *end = 0; /* set a temporary string terminator */
2922               if (strncmp(p, "-l", 2) == 0)
2923                 {
2924                   size_t name_len = 3+ /* "lib" */ LT_STRLEN (p + 2);
2925                   name = LT_EMALLOC (char, 1+ name_len);
2926                   if (name)
2927                     sprintf (name, "lib%s", p+2);
2928                 }
2929               else
2930                 name = lt_estrdup(p);
2931
2932               if (!name)
2933                 goto cleanup_names;
2934
2935               names[depcount++] = name;
2936               *end = save;
2937             }
2938           p = end;
2939         }
2940     }
2941
2942   /* load the deplibs (in reverse order)
2943      At this stage, don't worry if the deplibs do not load correctly,
2944      they may already be statically linked into the loading application
2945      for instance.  There will be a more enlightening error message
2946      later on if the loaded module cannot resolve all of its symbols.  */
2947   if (depcount)
2948     {
2949       int       j = 0;
2950
2951       handle->deplibs = (lt_dlhandle*) LT_EMALLOC (lt_dlhandle *, depcount);
2952       if (!handle->deplibs)
2953         goto cleanup;
2954
2955       for (i = 0; i < depcount; ++i)
2956         {
2957           handle->deplibs[j] = lt_dlopenext(names[depcount-1-i]);
2958           if (handle->deplibs[j])
2959             {
2960               ++j;
2961             }
2962         }
2963
2964       handle->depcount  = j;    /* Number of successfully loaded deplibs */
2965       errors            = 0;
2966     }
2967
2968  cleanup_names:
2969   for (i = 0; i < depcount; ++i)
2970     {
2971       LT_DLFREE (names[i]);
2972     }
2973
2974  cleanup:
2975   LT_DLFREE (names);
2976 #endif
2977
2978   return errors;
2979 }
2980
2981 static int
2982 unload_deplibs (handle)
2983      lt_dlhandle handle;
2984 {
2985   int i;
2986   int errors = 0;
2987
2988   if (handle->depcount)
2989     {
2990       for (i = 0; i < handle->depcount; ++i)
2991         {
2992           if (!LT_DLIS_RESIDENT (handle->deplibs[i]))
2993             {
2994               errors += lt_dlclose (handle->deplibs[i]);
2995             }
2996         }
2997     }
2998
2999   return errors;
3000 }
3001
3002 static int
3003 trim (dest, str)
3004      char **dest;
3005      const char *str;
3006 {
3007   /* remove the leading and trailing "'" from str
3008      and store the result in dest */
3009   const char *end   = strrchr (str, '\'');
3010   size_t len        = LT_STRLEN (str);
3011   char *tmp;
3012
3013   LT_DLFREE (*dest);
3014
3015   if (!end)
3016     return 1;
3017
3018   if (len > 3 && str[0] == '\'')
3019     {
3020       tmp = LT_EMALLOC (char, end - str);
3021       if (!tmp)
3022         return 1;
3023
3024       strncpy(tmp, &str[1], (end - str) - 1);
3025       tmp[len-3] = LT_EOS_CHAR;
3026       *dest = tmp;
3027     }
3028   else
3029     {
3030       *dest = 0;
3031     }
3032
3033   return 0;
3034 }
3035
3036 static int
3037 free_vars (dlname, oldname, libdir, deplibs)
3038      char *dlname;
3039      char *oldname;
3040      char *libdir;
3041      char *deplibs;
3042 {
3043   LT_DLFREE (dlname);
3044   LT_DLFREE (oldname);
3045   LT_DLFREE (libdir);
3046   LT_DLFREE (deplibs);
3047
3048   return 0;
3049 }
3050
3051 static int
3052 try_dlopen (phandle, filename)
3053      lt_dlhandle *phandle;
3054      const char *filename;
3055 {
3056   const char *  ext             = 0;
3057   const char *  saved_error     = 0;
3058   char *        canonical       = 0;
3059   char *        base_name       = 0;
3060   char *        dir             = 0;
3061   char *        name            = 0;
3062   int           errors          = 0;
3063   lt_dlhandle   newhandle;
3064
3065   assert (phandle);
3066   assert (*phandle == 0);
3067
3068   LT_DLMUTEX_GETERROR (saved_error);
3069
3070   /* dlopen self? */
3071   if (!filename)
3072     {
3073       *phandle = (lt_dlhandle) LT_EMALLOC (struct lt_dlhandle_struct, 1);
3074       if (*phandle == 0)
3075         return 1;
3076
3077       memset (*phandle, 0, sizeof(struct lt_dlhandle_struct));
3078       newhandle = *phandle;
3079
3080       /* lt_dlclose()ing yourself is very bad!  Disallow it.  */
3081       LT_DLSET_FLAG (*phandle, LT_DLRESIDENT_FLAG);
3082
3083       if (tryall_dlopen (&newhandle, 0) != 0)
3084         {
3085           LT_DLFREE (*phandle);
3086           return 1;
3087         }
3088
3089       goto register_handle;
3090     }
3091
3092   assert (filename && *filename);
3093
3094   /* Doing this immediately allows internal functions to safely
3095      assume only canonicalized paths are passed.  */
3096   if (canonicalize_path (filename, &canonical) != 0)
3097     {
3098       ++errors;
3099       goto cleanup;
3100     }
3101
3102   /* If the canonical module name is a path (relative or absolute)
3103      then split it into a directory part and a name part.  */
3104   base_name = strrchr (canonical, '/');
3105   if (base_name)
3106     {
3107       size_t dirlen = (1+ base_name) - canonical;
3108
3109       dir = LT_EMALLOC (char, 1+ dirlen);
3110       if (!dir)
3111         {
3112           ++errors;
3113           goto cleanup;
3114         }
3115
3116       strncpy (dir, canonical, dirlen);
3117       dir[dirlen] = LT_EOS_CHAR;
3118
3119       ++base_name;
3120     }
3121   else
3122     base_name = canonical;
3123
3124   assert (base_name && *base_name);
3125
3126   /* Check whether we are opening a libtool module (.la extension).  */
3127   ext = strrchr (base_name, '.');
3128   if (ext && strcmp (ext, archive_ext) == 0)
3129     {
3130       /* this seems to be a libtool module */
3131       FILE *    file     = 0;
3132       char *    dlname   = 0;
3133       char *    old_name = 0;
3134       char *    libdir   = 0;
3135       char *    deplibs  = 0;
3136       char *    line     = 0;
3137       size_t    line_len;
3138
3139       /* if we can't find the installed flag, it is probably an
3140          installed libtool archive, produced with an old version
3141          of libtool */
3142       int       installed = 1;
3143
3144       /* extract the module name from the file name */
3145       name = LT_EMALLOC (char, ext - base_name + 1);
3146       if (!name)
3147         {
3148           ++errors;
3149           goto cleanup;
3150         }
3151
3152       /* canonicalize the module name */
3153       {
3154         size_t i;
3155         for (i = 0; i < ext - base_name; ++i)
3156           {
3157             if (isalnum ((int)(base_name[i])))
3158               {
3159                 name[i] = base_name[i];
3160               }
3161             else
3162               {
3163                 name[i] = '_';
3164               }
3165           }
3166         name[ext - base_name] = LT_EOS_CHAR;
3167       }
3168
3169       /* Now try to open the .la file.  If there is no directory name
3170          component, try to find it first in user_search_path and then other
3171          prescribed paths.  Otherwise (or in any case if the module was not
3172          yet found) try opening just the module name as passed.  */
3173       if (!dir)
3174         {
3175           const char *search_path;
3176
3177           LT_DLMUTEX_LOCK ();
3178           search_path = user_search_path;
3179           if (search_path)
3180             file = find_file (user_search_path, base_name, &dir);
3181           LT_DLMUTEX_UNLOCK ();
3182
3183           if (!file)
3184             {
3185               search_path = getenv (LTDL_SEARCHPATH_VAR);
3186               if (search_path)
3187                 file = find_file (search_path, base_name, &dir);
3188             }
3189
3190 #ifdef LTDL_SHLIBPATH_VAR
3191           if (!file)
3192             {
3193               search_path = getenv (LTDL_SHLIBPATH_VAR);
3194               if (search_path)
3195                 file = find_file (search_path, base_name, &dir);
3196             }
3197 #endif
3198 #ifdef LTDL_SYSSEARCHPATH
3199           if (!file && sys_search_path)
3200             {
3201               file = find_file (sys_search_path, base_name, &dir);
3202             }
3203 #endif
3204         }
3205       if (!file)
3206         {
3207           file = fopen (filename, LT_READTEXT_MODE);
3208         }
3209
3210       /* If we didn't find the file by now, it really isn't there.  Set
3211          the status flag, and bail out.  */
3212       if (!file)
3213         {
3214           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
3215           ++errors;
3216           goto cleanup;
3217         }
3218
3219       line_len = LT_FILENAME_MAX;
3220       line = LT_EMALLOC (char, line_len);
3221       if (!line)
3222         {
3223           fclose (file);
3224           ++errors;
3225           goto cleanup;
3226         }
3227
3228       /* read the .la file */
3229       while (!feof (file))
3230         {
3231           if (!fgets (line, (int) line_len, file))
3232             {
3233               break;
3234             }
3235
3236           /* Handle the case where we occasionally need to read a line
3237              that is longer than the initial buffer size.  */
3238           while ((line[LT_STRLEN(line) -1] != '\n') && (!feof (file)))
3239             {
3240               line = LT_DLREALLOC (char, line, line_len *2);
3241               if (!fgets (&line[line_len -1], (int) line_len +1, file))
3242                 {
3243                   break;
3244                 }
3245               line_len *= 2;
3246             }
3247
3248           if (line[0] == '\n' || line[0] == '#')
3249             {
3250               continue;
3251             }
3252
3253 #undef  STR_DLNAME
3254 #define STR_DLNAME      "dlname="
3255           if (strncmp (line, STR_DLNAME, sizeof (STR_DLNAME) - 1) == 0)
3256             {
3257               errors += trim (&dlname, &line[sizeof (STR_DLNAME) - 1]);
3258             }
3259
3260 #undef  STR_OLD_LIBRARY
3261 #define STR_OLD_LIBRARY "old_library="
3262           else if (strncmp (line, STR_OLD_LIBRARY,
3263                             sizeof (STR_OLD_LIBRARY) - 1) == 0)
3264             {
3265               errors += trim (&old_name, &line[sizeof (STR_OLD_LIBRARY) - 1]);
3266             }
3267 #undef  STR_LIBDIR
3268 #define STR_LIBDIR      "libdir="
3269           else if (strncmp (line, STR_LIBDIR, sizeof (STR_LIBDIR) - 1) == 0)
3270             {
3271               errors += trim (&libdir, &line[sizeof(STR_LIBDIR) - 1]);
3272             }
3273
3274 #undef  STR_DL_DEPLIBS
3275 #define STR_DL_DEPLIBS  "dependency_libs="
3276           else if (strncmp (line, STR_DL_DEPLIBS,
3277                             sizeof (STR_DL_DEPLIBS) - 1) == 0)
3278             {
3279               errors += trim (&deplibs, &line[sizeof (STR_DL_DEPLIBS) - 1]);
3280             }
3281           else if (strcmp (line, "installed=yes\n") == 0)
3282             {
3283               installed = 1;
3284             }
3285           else if (strcmp (line, "installed=no\n") == 0)
3286             {
3287               installed = 0;
3288             }
3289
3290 #undef  STR_LIBRARY_NAMES
3291 #define STR_LIBRARY_NAMES "library_names="
3292           else if (! dlname && strncmp (line, STR_LIBRARY_NAMES,
3293                                         sizeof (STR_LIBRARY_NAMES) - 1) == 0)
3294             {
3295               char *last_libname;
3296               errors += trim (&dlname, &line[sizeof (STR_LIBRARY_NAMES) - 1]);
3297               if (!errors
3298                   && dlname
3299                   && (last_libname = strrchr (dlname, ' ')) != 0)
3300                 {
3301                   last_libname = lt_estrdup (last_libname + 1);
3302                   if (!last_libname)
3303                     {
3304                       ++errors;
3305                       goto cleanup;
3306                     }
3307                   LT_DLMEM_REASSIGN (dlname, last_libname);
3308                 }
3309             }
3310
3311           if (errors)
3312             break;
3313         }
3314
3315       fclose (file);
3316       LT_DLFREE (line);
3317
3318       /* allocate the handle */
3319       *phandle = (lt_dlhandle) LT_EMALLOC (struct lt_dlhandle_struct, 1);
3320       if (*phandle == 0)
3321         ++errors;
3322
3323       if (errors)
3324         {
3325           free_vars (dlname, old_name, libdir, deplibs);
3326           LT_DLFREE (*phandle);
3327           goto cleanup;
3328         }
3329
3330       assert (*phandle);
3331
3332       memset (*phandle, 0, sizeof(struct lt_dlhandle_struct));
3333       if (load_deplibs (*phandle, deplibs) == 0)
3334         {
3335           newhandle = *phandle;
3336           /* find_module may replace newhandle */
3337           if (find_module (&newhandle, dir, libdir, dlname, old_name, installed))
3338             {
3339               unload_deplibs (*phandle);
3340               ++errors;
3341             }
3342         }
3343       else
3344         {
3345           ++errors;
3346         }
3347
3348       free_vars (dlname, old_name, libdir, deplibs);
3349       if (errors)
3350         {
3351           LT_DLFREE (*phandle);
3352           goto cleanup;
3353         }
3354
3355       if (*phandle != newhandle)
3356         {
3357           unload_deplibs (*phandle);
3358         }
3359     }
3360   else
3361     {
3362       /* not a libtool module */
3363       *phandle = (lt_dlhandle) LT_EMALLOC (struct lt_dlhandle_struct, 1);
3364       if (*phandle == 0)
3365         {
3366           ++errors;
3367           goto cleanup;
3368         }
3369
3370       memset (*phandle, 0, sizeof (struct lt_dlhandle_struct));
3371       newhandle = *phandle;
3372
3373       /* If the module has no directory name component, try to find it
3374          first in user_search_path and then other prescribed paths.
3375          Otherwise (or in any case if the module was not yet found) try
3376          opening just the module name as passed.  */
3377       if ((dir || (!find_handle (user_search_path, base_name, &newhandle)
3378                    && !find_handle (getenv (LTDL_SEARCHPATH_VAR), base_name,
3379                                     &newhandle)
3380 #ifdef LTDL_SHLIBPATH_VAR
3381                    && !find_handle (getenv (LTDL_SHLIBPATH_VAR), base_name,
3382                                     &newhandle)
3383 #endif
3384 #ifdef LTDL_SYSSEARCHPATH
3385                    && !find_handle (sys_search_path, base_name, &newhandle)
3386 #endif
3387                    )))
3388         {
3389           if (tryall_dlopen (&newhandle, filename) != 0)
3390             {
3391               newhandle = NULL;
3392             }
3393         }
3394
3395       if (!newhandle)
3396         {
3397           LT_DLFREE (*phandle);
3398           ++errors;
3399           goto cleanup;
3400         }
3401     }
3402
3403  register_handle:
3404   LT_DLMEM_REASSIGN (*phandle, newhandle);
3405
3406   if ((*phandle)->info.ref_count == 0)
3407     {
3408       (*phandle)->info.ref_count        = 1;
3409       LT_DLMEM_REASSIGN ((*phandle)->info.name, name);
3410
3411       LT_DLMUTEX_LOCK ();
3412       (*phandle)->next          = handles;
3413       handles                   = *phandle;
3414       LT_DLMUTEX_UNLOCK ();
3415     }
3416
3417   LT_DLMUTEX_SETERROR (saved_error);
3418
3419  cleanup:
3420   LT_DLFREE (dir);
3421   LT_DLFREE (name);
3422   LT_DLFREE (canonical);
3423
3424   return errors;
3425 }
3426
3427 lt_dlhandle
3428 lt_dlopen (filename)
3429      const char *filename;
3430 {
3431   lt_dlhandle handle = 0;
3432
3433   /* Just incase we missed a code path in try_dlopen() that reports
3434      an error, but forgets to reset handle... */
3435   if (try_dlopen (&handle, filename) != 0)
3436     return 0;
3437
3438   return handle;
3439 }
3440
3441 /* If the last error messge store was `FILE_NOT_FOUND', then return
3442    non-zero.  */
3443 static int
3444 file_not_found ()
3445 {
3446   const char *error = 0;
3447
3448   LT_DLMUTEX_GETERROR (error);
3449   if (error == LT_DLSTRERROR (FILE_NOT_FOUND))
3450     return 1;
3451
3452   return 0;
3453 }
3454
3455 /* If FILENAME has an ARCHIVE_EXT or SHLIB_EXT extension, try to
3456    open the FILENAME as passed.  Otherwise try appending ARCHIVE_EXT,
3457    and if a file is still not found try again with SHLIB_EXT appended
3458    instead.  */
3459 lt_dlhandle
3460 lt_dlopenext (filename)
3461      const char *filename;
3462 {
3463   lt_dlhandle   handle          = 0;
3464   char *        tmp             = 0;
3465   char *        ext             = 0;
3466   size_t        len;
3467   int           errors          = 0;
3468
3469   if (!filename)
3470     {
3471       return lt_dlopen (filename);
3472     }
3473
3474   assert (filename);
3475
3476   len = LT_STRLEN (filename);
3477   ext = strrchr (filename, '.');
3478
3479   /* If FILENAME already bears a suitable extension, there is no need
3480      to try appending additional extensions.  */
3481   if (ext && ((strcmp (ext, archive_ext) == 0)
3482 #ifdef LTDL_SHLIB_EXT
3483               || (strcmp (ext, shlib_ext) == 0)
3484 #endif
3485       ))
3486     {
3487       return lt_dlopen (filename);
3488     }
3489
3490   /* First try appending ARCHIVE_EXT.  */
3491   tmp = LT_EMALLOC (char, len + LT_STRLEN (archive_ext) + 1);
3492   if (!tmp)
3493     return 0;
3494
3495   strcpy (tmp, filename);
3496   strcat (tmp, archive_ext);
3497   errors = try_dlopen (&handle, tmp);
3498
3499   /* If we found FILENAME, stop searching -- whether we were able to
3500      load the file as a module or not.  If the file exists but loading
3501      failed, it is better to return an error message here than to
3502      report FILE_NOT_FOUND when the alternatives (foo.so etc) are not
3503      in the module search path.  */
3504   if (handle || ((errors > 0) && !file_not_found ()))
3505     {
3506       LT_DLFREE (tmp);
3507       return handle;
3508     }
3509
3510 #ifdef LTDL_SHLIB_EXT
3511   /* Try appending SHLIB_EXT.   */
3512   if (LT_STRLEN (shlib_ext) > LT_STRLEN (archive_ext))
3513     {
3514       LT_DLFREE (tmp);
3515       tmp = LT_EMALLOC (char, len + LT_STRLEN (shlib_ext) + 1);
3516       if (!tmp)
3517         return 0;
3518
3519       strcpy (tmp, filename);
3520     }
3521   else
3522     {
3523       tmp[len] = LT_EOS_CHAR;
3524     }
3525
3526   strcat(tmp, shlib_ext);
3527   errors = try_dlopen (&handle, tmp);
3528
3529   /* As before, if the file was found but loading failed, return now
3530      with the current error message.  */
3531   if (handle || ((errors > 0) && !file_not_found ()))
3532     {
3533       LT_DLFREE (tmp);
3534       return handle;
3535     }
3536 #endif
3537
3538   /* Still here?  Then we really did fail to locate any of the file
3539      names we tried.  */
3540   LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
3541   LT_DLFREE (tmp);
3542   return 0;
3543 }
3544
3545
3546 static int
3547 lt_argz_insert (pargz, pargz_len, before, entry)
3548      char **pargz;
3549      size_t *pargz_len;
3550      char *before;
3551      const char *entry;
3552 {
3553   error_t error;
3554
3555   if ((error = argz_insert (pargz, pargz_len, before, entry)))
3556     {
3557       switch (error)
3558         {
3559         case ENOMEM:
3560           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY));
3561           break;
3562         default:
3563           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (UNKNOWN));
3564           break;
3565         }
3566       return 1;
3567     }
3568
3569   return 0;
3570 }
3571
3572 static int
3573 lt_argz_insertinorder (pargz, pargz_len, entry)
3574      char **pargz;
3575      size_t *pargz_len;
3576      const char *entry;
3577 {
3578   char *before = 0;
3579
3580   assert (pargz);
3581   assert (pargz_len);
3582   assert (entry && *entry);
3583
3584   if (*pargz)
3585     while ((before = argz_next (*pargz, *pargz_len, before)))
3586       {
3587         int cmp = strcmp (entry, before);
3588
3589         if (cmp < 0)  break;
3590         if (cmp == 0) return 0; /* No duplicates! */
3591       }
3592
3593   return lt_argz_insert (pargz, pargz_len, before, entry);
3594 }
3595
3596 static int
3597 lt_argz_insertdir (pargz, pargz_len, dirnam, dp)
3598      char **pargz;
3599      size_t *pargz_len;
3600      const char *dirnam;
3601      struct dirent *dp;
3602 {
3603   char   *buf       = 0;
3604   size_t buf_len    = 0;
3605   char   *end       = 0;
3606   size_t end_offset = 0;
3607   size_t dir_len    = 0;
3608   int    errors     = 0;
3609
3610   assert (pargz);
3611   assert (pargz_len);
3612   assert (dp);
3613
3614   dir_len = LT_STRLEN (dirnam);
3615   end     = dp->d_name + LT_D_NAMLEN(dp);
3616
3617   /* Ignore version numbers.  */
3618   {
3619     char *p;
3620     for (p = end; p -1 > dp->d_name; --p)
3621       if (strchr (".0123456789", p[-1]) == 0)
3622         break;
3623
3624     if (*p == '.')
3625       end = p;
3626   }
3627
3628   /* Ignore filename extension.  */
3629   {
3630     char *p;
3631     for (p = end -1; p > dp->d_name; --p)
3632       if (*p == '.')
3633         {
3634           end = p;
3635           break;
3636         }
3637   }
3638
3639   /* Prepend the directory name.  */
3640   end_offset    = end - dp->d_name;
3641   buf_len       = dir_len + 1+ end_offset;
3642   buf           = LT_EMALLOC (char, 1+ buf_len);
3643   if (!buf)
3644     return ++errors;
3645
3646   assert (buf);
3647
3648   strcpy  (buf, dirnam);
3649   strcat  (buf, "/");
3650   strncat (buf, dp->d_name, end_offset);
3651   buf[buf_len] = LT_EOS_CHAR;
3652
3653   /* Try to insert (in order) into ARGZ/ARGZ_LEN.  */
3654   if (lt_argz_insertinorder (pargz, pargz_len, buf) != 0)
3655     ++errors;
3656
3657   LT_DLFREE (buf);
3658
3659   return errors;
3660 }
3661
3662 static int
3663 list_files_by_dir (dirnam, pargz, pargz_len)
3664      const char *dirnam;
3665      char **pargz;
3666      size_t *pargz_len;
3667 {
3668   DIR   *dirp     = 0;
3669   int    errors   = 0;
3670
3671   assert (dirnam && *dirnam);
3672   assert (pargz);
3673   assert (pargz_len);
3674   assert (dirnam[LT_STRLEN(dirnam) -1] != '/');
3675
3676   dirp = opendir (dirnam);
3677   if (dirp)
3678     {
3679       struct dirent *dp = 0;
3680
3681       while ((dp = readdir (dirp)))
3682         if (dp->d_name[0] != '.')
3683           if (lt_argz_insertdir (pargz, pargz_len, dirnam, dp))
3684             {
3685               ++errors;
3686               break;
3687             }
3688
3689       closedir (dirp);
3690     }
3691   else
3692     ++errors;
3693
3694   return errors;
3695 }
3696
3697
3698 /* If there are any files in DIRNAME, call the function passed in
3699    DATA1 (with the name of each file and DATA2 as arguments).  */
3700 static int
3701 foreachfile_callback (dirname, data1, data2)
3702      char *dirname;
3703      lt_ptr data1;
3704      lt_ptr data2;
3705 {
3706   int (*func) LT_PARAMS((const char *filename, lt_ptr data))
3707         = (int (*) LT_PARAMS((const char *filename, lt_ptr data))) data1;
3708
3709   int     is_done  = 0;
3710   char   *argz     = 0;
3711   size_t  argz_len = 0;
3712
3713   if (list_files_by_dir (dirname, &argz, &argz_len) != 0)
3714     goto cleanup;
3715   if (!argz)
3716     goto cleanup;
3717
3718   {
3719     char *filename = 0;
3720     while ((filename = argz_next (argz, argz_len, filename)))
3721       if ((is_done = (*func) (filename, data2)))
3722         break;
3723   }
3724
3725  cleanup:
3726   LT_DLFREE (argz);
3727
3728   return is_done;
3729 }
3730
3731
3732 /* Call FUNC for each unique extensionless file in SEARCH_PATH, along
3733    with DATA.  The filenames passed to FUNC would be suitable for
3734    passing to lt_dlopenext.  The extensions are stripped so that
3735    individual modules do not generate several entries (e.g. libfoo.la,
3736    libfoo.so, libfoo.so.1, libfoo.so.1.0.0).  If SEARCH_PATH is NULL,
3737    then the same directories that lt_dlopen would search are examined.  */
3738 int
3739 lt_dlforeachfile (search_path, func, data)
3740      const char *search_path;
3741      int (*func) LT_PARAMS ((const char *filename, lt_ptr data));
3742      lt_ptr data;
3743 {
3744   int is_done = 0;
3745
3746   if (search_path)
3747     {
3748       /* If a specific path was passed, search only the directories
3749          listed in it.  */
3750       is_done = foreach_dirinpath (search_path, 0,
3751                                    foreachfile_callback, func, data);
3752     }
3753   else
3754     {
3755       /* Otherwise search the default paths.  */
3756       is_done = foreach_dirinpath (user_search_path, 0,
3757                                    foreachfile_callback, func, data);
3758       if (!is_done)
3759         {
3760           is_done = foreach_dirinpath (getenv("LTDL_LIBRARY_PATH"), 0,
3761                                        foreachfile_callback, func, data);
3762         }
3763
3764 #ifdef LTDL_SHLIBPATH_VAR
3765       if (!is_done)
3766         {
3767           is_done = foreach_dirinpath (getenv(LTDL_SHLIBPATH_VAR), 0,
3768                                        foreachfile_callback, func, data);
3769         }
3770 #endif
3771 #ifdef LTDL_SYSSEARCHPATH
3772       if (!is_done)
3773         {
3774           is_done = foreach_dirinpath (getenv(LTDL_SYSSEARCHPATH), 0,
3775                                        foreachfile_callback, func, data);
3776         }
3777 #endif
3778     }
3779
3780   return is_done;
3781 }
3782
3783 int
3784 lt_dlclose (handle)
3785      lt_dlhandle handle;
3786 {
3787   lt_dlhandle cur, last;
3788   int errors = 0;
3789
3790   LT_DLMUTEX_LOCK ();
3791
3792   /* check whether the handle is valid */
3793   last = cur = handles;
3794   while (cur && handle != cur)
3795     {
3796       last = cur;
3797       cur = cur->next;
3798     }
3799
3800   if (!cur)
3801     {
3802       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
3803       ++errors;
3804       goto done;
3805     }
3806
3807   handle->info.ref_count--;
3808
3809   /* Note that even with resident modules, we must track the ref_count
3810      correctly incase the user decides to reset the residency flag
3811      later (even though the API makes no provision for that at the
3812      moment).  */
3813   if (handle->info.ref_count <= 0 && !LT_DLIS_RESIDENT (handle))
3814     {
3815       lt_user_data data = handle->loader->dlloader_data;
3816
3817       if (handle != handles)
3818         {
3819           last->next = handle->next;
3820         }
3821       else
3822         {
3823           handles = handle->next;
3824         }
3825
3826       errors += handle->loader->module_close (data, handle->module);
3827       errors += unload_deplibs(handle);
3828
3829       /* It is up to the callers to free the data itself.  */
3830       LT_DLFREE (handle->caller_data);
3831
3832       LT_DLFREE (handle->info.filename);
3833       LT_DLFREE (handle->info.name);
3834       LT_DLFREE (handle);
3835
3836       goto done;
3837     }
3838
3839   if (LT_DLIS_RESIDENT (handle))
3840     {
3841       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CLOSE_RESIDENT_MODULE));
3842       ++errors;
3843     }
3844
3845  done:
3846   LT_DLMUTEX_UNLOCK ();
3847
3848   return errors;
3849 }
3850
3851 lt_ptr
3852 lt_dlsym (handle, symbol)
3853      lt_dlhandle handle;
3854      const char *symbol;
3855 {
3856   size_t lensym;
3857   char  lsym[LT_SYMBOL_LENGTH];
3858   char  *sym;
3859   lt_ptr address;
3860   lt_user_data data;
3861
3862   if (!handle)
3863     {
3864       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
3865       return 0;
3866     }
3867
3868   if (!symbol)
3869     {
3870       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
3871       return 0;
3872     }
3873
3874   lensym = LT_STRLEN (symbol) + LT_STRLEN (handle->loader->sym_prefix)
3875                                         + LT_STRLEN (handle->info.name);
3876
3877   if (lensym + LT_SYMBOL_OVERHEAD < LT_SYMBOL_LENGTH)
3878     {
3879       sym = lsym;
3880     }
3881   else
3882     {
3883       sym = LT_EMALLOC (char, lensym + LT_SYMBOL_OVERHEAD + 1);
3884       if (!sym)
3885         {
3886           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (BUFFER_OVERFLOW));
3887           return 0;
3888         }
3889     }
3890
3891   data = handle->loader->dlloader_data;
3892   if (handle->info.name)
3893     {
3894       const char *saved_error;
3895
3896       LT_DLMUTEX_GETERROR (saved_error);
3897
3898       /* this is a libtool module */
3899       if (handle->loader->sym_prefix)
3900         {
3901           strcpy(sym, handle->loader->sym_prefix);
3902           strcat(sym, handle->info.name);
3903         }
3904       else
3905         {
3906           strcpy(sym, handle->info.name);
3907         }
3908
3909       strcat(sym, "_LTX_");
3910       strcat(sym, symbol);
3911
3912       /* try "modulename_LTX_symbol" */
3913       address = handle->loader->find_sym (data, handle->module, sym);
3914       if (address)
3915         {
3916           if (sym != lsym)
3917             {
3918               LT_DLFREE (sym);
3919             }
3920           return address;
3921         }
3922       LT_DLMUTEX_SETERROR (saved_error);
3923     }
3924
3925   /* otherwise try "symbol" */
3926   if (handle->loader->sym_prefix)
3927     {
3928       strcpy(sym, handle->loader->sym_prefix);
3929       strcat(sym, symbol);
3930     }
3931   else
3932     {
3933       strcpy(sym, symbol);
3934     }
3935
3936   address = handle->loader->find_sym (data, handle->module, sym);
3937   if (sym != lsym)
3938     {
3939       LT_DLFREE (sym);
3940     }
3941
3942   return address;
3943 }
3944
3945 const char *
3946 lt_dlerror ()
3947 {
3948   const char *error;
3949
3950   LT_DLMUTEX_GETERROR (error);
3951   LT_DLMUTEX_SETERROR (0);
3952
3953   return error ? error : NULL;
3954 }
3955
3956 static int
3957 lt_dlpath_insertdir (ppath, before, dir)
3958      char **ppath;
3959      char *before;
3960      const char *dir;
3961 {
3962   int    errors         = 0;
3963   char  *canonical      = 0;
3964   char  *argz           = 0;
3965   size_t argz_len       = 0;
3966
3967   assert (ppath);
3968   assert (dir && *dir);
3969
3970   if (canonicalize_path (dir, &canonical) != 0)
3971     {
3972       ++errors;
3973       goto cleanup;
3974     }
3975
3976   assert (canonical && *canonical);
3977
3978   /* If *PPATH is empty, set it to DIR.  */
3979   if (*ppath == 0)
3980     {
3981       assert (!before);         /* BEFORE cannot be set without PPATH.  */
3982       assert (dir);             /* Without DIR, don't call this function!  */
3983
3984       *ppath = lt_estrdup (dir);
3985       if (*ppath == 0)
3986         ++errors;
3987
3988       return errors;
3989     }
3990
3991   assert (ppath && *ppath);
3992
3993   if (argzize_path (*ppath, &argz, &argz_len) != 0)
3994     {
3995       ++errors;
3996       goto cleanup;
3997     }
3998
3999   /* Convert BEFORE into an equivalent offset into ARGZ.  This only works
4000      if *PPATH is already canonicalized, and hence does not change length
4001      with respect to ARGZ.  We canonicalize each entry as it is added to
4002      the search path, and don't call this function with (uncanonicalized)
4003      user paths, so this is a fair assumption.  */
4004   if (before)
4005     {
4006       assert (*ppath <= before);
4007       assert (before - *ppath <= strlen (*ppath));
4008
4009       before = before - *ppath + argz;
4010     }
4011
4012   if (lt_argz_insert (&argz, &argz_len, before, dir) != 0)
4013     {
4014       ++errors;
4015       goto cleanup;
4016     }
4017
4018   argz_stringify (argz, argz_len, LT_PATHSEP_CHAR);
4019   LT_DLMEM_REASSIGN (*ppath,  argz);
4020
4021  cleanup:
4022   LT_DLFREE (canonical);
4023   LT_DLFREE (argz);
4024
4025   return errors;
4026 }
4027
4028 int
4029 lt_dladdsearchdir (search_dir)
4030      const char *search_dir;
4031 {
4032   int errors = 0;
4033
4034   if (search_dir && *search_dir)
4035     {
4036       LT_DLMUTEX_LOCK ();
4037       if (lt_dlpath_insertdir (&user_search_path, 0, search_dir) != 0)
4038         ++errors;
4039       LT_DLMUTEX_UNLOCK ();
4040     }
4041
4042   return errors;
4043 }
4044
4045 int
4046 lt_dlinsertsearchdir (before, search_dir)
4047      const char *before;
4048      const char *search_dir;
4049 {
4050   int errors = 0;
4051
4052   if (before)
4053     {
4054       LT_DLMUTEX_LOCK ();
4055       if ((before < user_search_path)
4056           || (before >= user_search_path + LT_STRLEN (user_search_path)))
4057         {
4058           LT_DLMUTEX_UNLOCK ();
4059           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_POSITION));
4060           return 1;
4061         }
4062       LT_DLMUTEX_UNLOCK ();
4063     }
4064
4065   if (search_dir && *search_dir)
4066     {
4067       LT_DLMUTEX_LOCK ();
4068       if (lt_dlpath_insertdir (&user_search_path,
4069                                (char *) before, search_dir) != 0)
4070         {
4071           ++errors;
4072         }
4073       LT_DLMUTEX_UNLOCK ();
4074     }
4075
4076   return errors;
4077 }
4078
4079 int
4080 lt_dlsetsearchpath (search_path)
4081      const char *search_path;
4082 {
4083   int   errors      = 0;
4084
4085   LT_DLMUTEX_LOCK ();
4086   LT_DLFREE (user_search_path);
4087   LT_DLMUTEX_UNLOCK ();
4088
4089   if (!search_path || !LT_STRLEN (search_path))
4090     {
4091       return errors;
4092     }
4093
4094   LT_DLMUTEX_LOCK ();
4095   if (canonicalize_path (search_path, &user_search_path) != 0)
4096     ++errors;
4097   LT_DLMUTEX_UNLOCK ();
4098
4099   return errors;
4100 }
4101
4102 const char *
4103 lt_dlgetsearchpath ()
4104 {
4105   const char *saved_path;
4106
4107   LT_DLMUTEX_LOCK ();
4108   saved_path = user_search_path;
4109   LT_DLMUTEX_UNLOCK ();
4110
4111   return saved_path;
4112 }
4113
4114 int
4115 lt_dlmakeresident (handle)
4116      lt_dlhandle handle;
4117 {
4118   int errors = 0;
4119
4120   if (!handle)
4121     {
4122       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
4123       ++errors;
4124     }
4125   else
4126     {
4127       LT_DLSET_FLAG (handle, LT_DLRESIDENT_FLAG);
4128     }
4129
4130   return errors;
4131 }
4132
4133 int
4134 lt_dlisresident (handle)
4135      lt_dlhandle handle;
4136 {
4137   if (!handle)
4138     {
4139       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
4140       return -1;
4141     }
4142
4143   return LT_DLIS_RESIDENT (handle);
4144 }
4145
4146
4147
4148 \f
4149 /* --- MODULE INFORMATION --- */
4150
4151 const lt_dlinfo *
4152 lt_dlgetinfo (handle)
4153      lt_dlhandle handle;
4154 {
4155   if (!handle)
4156     {
4157       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
4158       return 0;
4159     }
4160
4161   return &(handle->info);
4162 }
4163
4164 lt_dlhandle
4165 lt_dlhandle_next (place)
4166      lt_dlhandle place;
4167 {
4168   return place ? place->next : handles;
4169 }
4170
4171 int
4172 lt_dlforeach (func, data)
4173      int (*func) LT_PARAMS((lt_dlhandle handle, lt_ptr data));
4174      lt_ptr data;
4175 {
4176   int errors = 0;
4177   lt_dlhandle cur;
4178
4179   LT_DLMUTEX_LOCK ();
4180
4181   cur = handles;
4182   while (cur)
4183     {
4184       lt_dlhandle tmp = cur;
4185
4186       cur = cur->next;
4187       if ((*func) (tmp, data))
4188         {
4189           ++errors;
4190           break;
4191         }
4192     }
4193
4194   LT_DLMUTEX_UNLOCK ();
4195
4196   return errors;
4197 }
4198
4199 lt_dlcaller_id
4200 lt_dlcaller_register ()
4201 {
4202   static lt_dlcaller_id last_caller_id = 0;
4203   int result;
4204
4205   LT_DLMUTEX_LOCK ();
4206   result = ++last_caller_id;
4207   LT_DLMUTEX_UNLOCK ();
4208
4209   return result;
4210 }
4211
4212 lt_ptr
4213 lt_dlcaller_set_data (key, handle, data)
4214      lt_dlcaller_id key;
4215      lt_dlhandle handle;
4216      lt_ptr data;
4217 {
4218   int n_elements = 0;
4219   lt_ptr stale = (lt_ptr) 0;
4220   int i;
4221
4222   /* This needs to be locked so that the caller data can be updated
4223      simultaneously by different threads.  */
4224   LT_DLMUTEX_LOCK ();
4225
4226   if (handle->caller_data)
4227     while (handle->caller_data[n_elements].key)
4228       ++n_elements;
4229
4230   for (i = 0; i < n_elements; ++i)
4231     {
4232       if (handle->caller_data[i].key == key)
4233         {
4234           stale = handle->caller_data[i].data;
4235           break;
4236         }
4237     }
4238
4239   /* Ensure that there is enough room in this handle's caller_data
4240      array to accept a new element (and an empty end marker).  */
4241   if (i == n_elements)
4242     {
4243       lt_caller_data *temp
4244         = LT_DLREALLOC (lt_caller_data, handle->caller_data, 2+ n_elements);
4245
4246       if (!temp)
4247         {
4248           stale = 0;
4249           goto done;
4250         }
4251
4252       handle->caller_data = temp;
4253
4254       /* We only need this if we needed to allocate a new caller_data.  */
4255       handle->caller_data[i].key  = key;
4256       handle->caller_data[1+ i].key = 0;
4257     }
4258
4259   handle->caller_data[i].data = data;
4260
4261  done:
4262   LT_DLMUTEX_UNLOCK ();
4263
4264   return stale;
4265 }
4266
4267 lt_ptr
4268 lt_dlcaller_get_data  (key, handle)
4269      lt_dlcaller_id key;
4270      lt_dlhandle handle;
4271 {
4272   lt_ptr result = (lt_ptr) 0;
4273
4274   /* This needs to be locked so that the caller data isn't updated by
4275      another thread part way through this function.  */
4276   LT_DLMUTEX_LOCK ();
4277
4278   /* Locate the index of the element with a matching KEY.  */
4279   {
4280     int i;
4281     for (i = 0; handle->caller_data[i].key; ++i)
4282       {
4283         if (handle->caller_data[i].key == key)
4284           {
4285             result = handle->caller_data[i].data;
4286             break;
4287           }
4288       }
4289   }
4290
4291   LT_DLMUTEX_UNLOCK ();
4292
4293   return result;
4294 }
4295
4296
4297 \f
4298 /* --- USER MODULE LOADER API --- */
4299
4300
4301 int
4302 lt_dlloader_add (place, dlloader, loader_name)
4303      lt_dlloader *place;
4304      const struct lt_user_dlloader *dlloader;
4305      const char *loader_name;
4306 {
4307   int errors = 0;
4308   lt_dlloader *node = 0, *ptr = 0;
4309
4310   if ((dlloader == 0)   /* diagnose null parameters */
4311       || (dlloader->module_open == 0)
4312       || (dlloader->module_close == 0)
4313       || (dlloader->find_sym == 0))
4314     {
4315       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
4316       return 1;
4317     }
4318
4319   /* Create a new dlloader node with copies of the user callbacks.  */
4320   node = LT_EMALLOC (lt_dlloader, 1);
4321   if (!node)
4322     return 1;
4323
4324   node->next            = 0;
4325   node->loader_name     = loader_name;
4326   node->sym_prefix      = dlloader->sym_prefix;
4327   node->dlloader_exit   = dlloader->dlloader_exit;
4328   node->module_open     = dlloader->module_open;
4329   node->module_close    = dlloader->module_close;
4330   node->find_sym        = dlloader->find_sym;
4331   node->dlloader_data   = dlloader->dlloader_data;
4332
4333   LT_DLMUTEX_LOCK ();
4334   if (!loaders)
4335     {
4336       /* If there are no loaders, NODE becomes the list! */
4337       loaders = node;
4338     }
4339   else if (!place)
4340     {
4341       /* If PLACE is not set, add NODE to the end of the
4342          LOADERS list. */
4343       for (ptr = loaders; ptr->next; ptr = ptr->next)
4344         {
4345           /*NOWORK*/;
4346         }
4347
4348       ptr->next = node;
4349     }
4350   else if (loaders == place)
4351     {
4352       /* If PLACE is the first loader, NODE goes first. */
4353       node->next = place;
4354       loaders = node;
4355     }
4356   else
4357     {
4358       /* Find the node immediately preceding PLACE. */
4359       for (ptr = loaders; ptr->next != place; ptr = ptr->next)
4360         {
4361           /*NOWORK*/;
4362         }
4363
4364       if (ptr->next != place)
4365         {
4366           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
4367           ++errors;
4368         }
4369       else
4370         {
4371           /* Insert NODE between PTR and PLACE. */
4372           node->next = place;
4373           ptr->next  = node;
4374         }
4375     }
4376
4377   LT_DLMUTEX_UNLOCK ();
4378
4379   return errors;
4380 }
4381
4382 int
4383 lt_dlloader_remove (loader_name)
4384      const char *loader_name;
4385 {
4386   lt_dlloader *place = lt_dlloader_find (loader_name);
4387   lt_dlhandle handle;
4388   int errors = 0;
4389
4390   if (!place)
4391     {
4392       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
4393       return 1;
4394     }
4395
4396   LT_DLMUTEX_LOCK ();
4397
4398   /* Fail if there are any open modules which use this loader. */
4399   for  (handle = handles; handle; handle = handle->next)
4400     {
4401       if (handle->loader == place)
4402         {
4403           LT_DLMUTEX_SETERROR (LT_DLSTRERROR (REMOVE_LOADER));
4404           ++errors;
4405           goto done;
4406         }
4407     }
4408
4409   if (place == loaders)
4410     {
4411       /* PLACE is the first loader in the list. */
4412       loaders = loaders->next;
4413     }
4414   else
4415     {
4416       /* Find the loader before the one being removed. */
4417       lt_dlloader *prev;
4418       for (prev = loaders; prev->next; prev = prev->next)
4419         {
4420           if (!strcmp (prev->next->loader_name, loader_name))
4421             {
4422               break;
4423             }
4424         }
4425
4426       place = prev->next;
4427       prev->next = prev->next->next;
4428     }
4429
4430   if (place->dlloader_exit)
4431     {
4432       errors = place->dlloader_exit (place->dlloader_data);
4433     }
4434
4435   LT_DLFREE (place);
4436
4437  done:
4438   LT_DLMUTEX_UNLOCK ();
4439
4440   return errors;
4441 }
4442
4443 lt_dlloader *
4444 lt_dlloader_next (place)
4445      lt_dlloader *place;
4446 {
4447   lt_dlloader *next;
4448
4449   LT_DLMUTEX_LOCK ();
4450   next = place ? place->next : loaders;
4451   LT_DLMUTEX_UNLOCK ();
4452
4453   return next;
4454 }
4455
4456 const char *
4457 lt_dlloader_name (place)
4458      lt_dlloader *place;
4459 {
4460   const char *name = 0;
4461
4462   if (place)
4463     {
4464       LT_DLMUTEX_LOCK ();
4465       name = place ? place->loader_name : 0;
4466       LT_DLMUTEX_UNLOCK ();
4467     }
4468   else
4469     {
4470       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
4471     }
4472
4473   return name;
4474 }
4475
4476 lt_user_data *
4477 lt_dlloader_data (place)
4478      lt_dlloader *place;
4479 {
4480   lt_user_data *data = 0;
4481
4482   if (place)
4483     {
4484       LT_DLMUTEX_LOCK ();
4485       data = place ? &(place->dlloader_data) : 0;
4486       LT_DLMUTEX_UNLOCK ();
4487     }
4488   else
4489     {
4490       LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
4491     }
4492
4493   return data;
4494 }
4495
4496 lt_dlloader *
4497 lt_dlloader_find (loader_name)
4498      const char *loader_name;
4499 {
4500   lt_dlloader *place = 0;
4501
4502   LT_DLMUTEX_LOCK ();
4503   for (place = loaders; place; place = place->next)
4504     {
4505       if (strcmp (place->loader_name, loader_name) == 0)
4506         {
4507           break;
4508         }
4509     }
4510   LT_DLMUTEX_UNLOCK ();
4511
4512   return place;
4513 }