gcc/java/jcf-path.c

   1 /* Handle CLASSPATH, -classpath, and path searching.
   2    Copyright (C) 1998-2016 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.
  19
  20 Java and all Java-based marks are trademarks or registered trademarks
  21 of Sun Microsystems, Inc. in the United States and other countries.
  22 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  23
  24 /* Written by Tom Tromey <tromey@cygnus.com>, October 1998.  */
  25
  26 #include "config.h"
  27 #include "system.h"
  28 #include "coretypes.h"
  29
  30 #include <dirent.h>
  31
  32 #include "jcf.h"
  33
  34 #ifndef DIR_UP
  35 #define DIR_UP ".."
  36 #endif
  37
  38 \f
  39
  40 /* Possible flag values.  */
  41 #define FLAG_SYSTEM 1
  42 #define FLAG_ZIP    2
  43
  44 /* We keep linked lists of directory names.  A ``directory'' can be
  45    either an ordinary directory or a .zip file.  */
  46 struct entry
  47 {
  48   char *name;
  49   int flags;
  50   struct entry *next;
  51 };
  52
  53 static void free_entry (struct entry **);
  54 static void append_entry (struct entry **, struct entry *);
  55 static void add_entry (struct entry **, const char *, int);
  56 static void add_path (struct entry **, const char *, int);
  57
  58 /* We support several different ways to set the class path.
  59
  60    built-in system directory (only libgcj.jar)
  61    CLASSPATH environment variable
  62    -classpath option overrides $CLASSPATH
  63    -CLASSPATH option is a synonym for -classpath (for compatibility)
  64    -bootclasspath overrides built-in
  65    -extdirs sets the extensions directory path (overrides built-in)
  66    -I prepends path to list
  67
  68    We implement this by keeping several path lists, and then simply
  69    ignoring the ones which are not relevant.  */
  70
  71 /* This holds all the -I directories.  */
  72 static struct entry *include_dirs;
  73
  74 /* This holds the CLASSPATH environment variable.  */
  75 static struct entry *classpath_env;
  76
  77 /* This holds the -classpath command-line option.  */
  78 static struct entry *classpath_user;
  79
  80 /* This holds the default directories.  Some of these will have the
  81    "system" flag set.  */
  82 static struct entry *sys_dirs;
  83
  84 /* This holds the extensions path entries.  */
  85 static struct entry *extensions;
  86
  87 /* This is the sealed list.  It is just a combination of other lists.  */
  88 static struct entry *sealed;
  89
  90 /* We keep track of the longest path we've seen.  */
  91 static int longest_path = 0;
  92
  93 \f
  94
  95 static void
  96 free_entry (struct entry **entp)
  97 {
  98   struct entry *e, *n;
  99
 100   for (e = *entp; e; e = n)
 101     {
 102       n = e->next;
 103       free (e->name);
 104       free (e);
 105     }
 106   *entp = NULL;
 107 }
 108
 109 static void
 110 append_entry (struct entry **entp, struct entry *ent)
 111 {
 112   /* It doesn't matter if this is slow, since it is run only at
 113      startup, and then infrequently.  */
 114   struct entry *e;
 115
 116   /* Find end of list.  */
 117   for (e = *entp; e && e->next; e = e->next)
 118     ;
 119
 120   if (e)
 121     e->next = ent;
 122   else
 123     *entp = ent;
 124 }
 125
 126 static void
 127 add_entry (struct entry **entp, const char *filename, int is_system)
 128 {
 129   int len;
 130   struct entry *n;
 131
 132   n = XNEW (struct entry);
 133   n->flags = is_system ? FLAG_SYSTEM : 0;
 134   n->next = NULL;
 135
 136   len = strlen (filename);
 137
 138   if (len > 4 && (FILENAME_CMP (filename + len - 4, ".zip") == 0
 139                   || FILENAME_CMP (filename + len - 4, ".jar") == 0))
 140     {
 141       n->flags |= FLAG_ZIP;
 142       /* If the user uses -classpath then he'll have to include
 143          libgcj.jar in the value.  We check for this in a simplistic
 144          way.  Symlinks will fool this test.  This is only used for
 145          -MM and -MMD, so it probably isn't terribly important.  */
 146       if (! FILENAME_CMP (filename, LIBGCJ_ZIP_FILE))
 147         n->flags |= FLAG_SYSTEM;
 148     }
 149
 150   /* Note that we add a trailing separator to `.zip' names as well.
 151      This is a little hack that lets the searching code in jcf-io.c
 152      work more easily.  Eww.  */
 153   if (! IS_DIR_SEPARATOR (filename[len - 1]))
 154     {
 155       char *f2 = (char *) alloca (len + 2);
 156       strcpy (f2, filename);
 157       f2[len] = DIR_SEPARATOR;
 158       f2[len + 1] = '\0';
 159       n->name = xstrdup (f2);
 160       ++len;
 161     }
 162   else
 163     n->name = xstrdup (filename);
 164
 165   if (len > longest_path)
 166     longest_path = len;
 167
 168   append_entry (entp, n);
 169 }
 170
 171 static void
 172 add_path (struct entry **entp, const char *cp, int is_system)
 173 {
 174   const char *startp, *endp;
 175
 176   if (cp)
 177     {
 178       char *buf = (char *) alloca (strlen (cp) + 3);
 179       startp = endp = cp;
 180       while (1)
 181         {
 182           if (! *endp || *endp == PATH_SEPARATOR)
 183             {
 184               if (endp == startp)
 185                 {
 186                   buf[0] = '.';
 187                   buf[1] = DIR_SEPARATOR;
 188                   buf[2] = '\0';
 189                 }
 190               else
 191                 {
 192                   strncpy (buf, startp, endp - startp);
 193                   buf[endp - startp] = '\0';
 194                 }
 195               add_entry (entp, buf, is_system);
 196               if (! *endp)
 197                 break;
 198               ++endp;
 199               startp = endp;
 200             }
 201           else
 202             ++endp;
 203         }
 204     }
 205 }
 206
 207 static int init_done = 0;
 208
 209 /* Initialize the path module.  */
 210 void
 211 jcf_path_init (void)
 212 {
 213   char *cp;
 214   char *attempt, sep[2];
 215   struct stat stat_b;
 216   int found = 0, len;
 217
 218   if (init_done)
 219     return;
 220   init_done = 1;
 221
 222   sep[0] = DIR_SEPARATOR;
 223   sep[1] = '\0';
 224
 225   cp = getenv ("GCC_EXEC_PREFIX");
 226   if (cp)
 227     {
 228       attempt = (char *) alloca (strlen (cp) + 50);
 229       /* The exec prefix can be something like
 230          /usr/local/bin/../lib/gcc-lib/.  We want to change this
 231          into a pointer to the share/java directory.  We support two
 232          configurations: one where prefix and exec-prefix are the
 233          same, and one where exec-prefix is `prefix/SOMETHING'.  */
 234       strcpy (attempt, cp);
 235       strcat (attempt, DIR_UP);
 236       strcat (attempt, sep);
 237       strcat (attempt, DIR_UP);
 238       strcat (attempt, sep);
 239       len = strlen (attempt);
 240
 241       strcpy (attempt + len, "share");
 242       strcat (attempt, sep);
 243       strcat (attempt, "java");
 244       strcat (attempt, sep);
 245       strcat (attempt, "libgcj-" DEFAULT_TARGET_VERSION ".jar");
 246       if (! stat (attempt, &stat_b))
 247         {
 248           add_entry (&sys_dirs, attempt, 1);
 249           found = 1;
 250           strcpy (&attempt[strlen (attempt)
 251                            - strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],
 252                   sep);
 253           strcat (attempt, "ext");
 254           strcat (attempt, sep);
 255           if (! stat (attempt, &stat_b))
 256             jcf_path_extdirs_arg (attempt);
 257         }
 258       else
 259         {
 260           strcpy (attempt + len, DIR_UP);
 261           strcat (attempt, sep);
 262           strcat (attempt, "share");
 263           strcat (attempt, sep);
 264           strcat (attempt, "java");
 265           strcat (attempt, sep);
 266           strcat (attempt, "libgcj-" DEFAULT_TARGET_VERSION ".jar");
 267           if (! stat (attempt, &stat_b))
 268             {
 269               add_entry (&sys_dirs, attempt, 1);
 270               found = 1;
 271               strcpy (&attempt[strlen (attempt)
 272                                - strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],
 273                       sep);
 274               strcat (attempt, "ext");
 275               strcat (attempt, sep);
 276               if (! stat (attempt, &stat_b))
 277                 jcf_path_extdirs_arg (attempt);
 278             }
 279         }
 280     }
 281   if (! found)
 282     {
 283       /* Desperation: use the installed one.  */
 284       char *extdirs;
 285       add_entry (&sys_dirs, LIBGCJ_ZIP_FILE, 1);
 286       extdirs = (char *) alloca (strlen (LIBGCJ_ZIP_FILE) + 1);
 287       strcpy (extdirs, LIBGCJ_ZIP_FILE);
 288       strcpy (&extdirs[strlen (LIBGCJ_ZIP_FILE)
 289                       - strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],
 290               "ext");
 291       strcat (extdirs, sep);
 292       if (! stat (extdirs, &stat_b))
 293         jcf_path_extdirs_arg (extdirs);
 294     }
 295
 296   cp = getenv ("CLASSPATH");
 297   add_path (&classpath_env, cp, 0);
 298 }
 299
 300 /* Call this when -classpath is seen on the command line.
 301    This overrides only the $CLASSPATH environment variable.
 302  */
 303 void
 304 jcf_path_classpath_arg (const char *path)
 305 {
 306   free_entry (&classpath_user);
 307   add_path (&classpath_user, path, 0);
 308 }
 309
 310 /* Call this when -bootclasspath is seen on the command line.
 311  */
 312 void
 313 jcf_path_bootclasspath_arg (const char *path)
 314 {
 315   free_entry (&sys_dirs);
 316   add_path (&sys_dirs, path, 1);
 317 }
 318
 319 /* Call this when -extdirs is seen on the command line.
 320  */
 321 void
 322 jcf_path_extdirs_arg (const char *cp)
 323 {
 324   const char *startp, *endp;
 325
 326   free_entry (&extensions);
 327
 328   if (cp)
 329     {
 330       char *buf = (char *) alloca (strlen (cp) + 3);
 331       startp = endp = cp;
 332       while (1)
 333         {
 334           if (! *endp || *endp == PATH_SEPARATOR)
 335             {
 336               if (endp == startp)
 337                 return;
 338
 339               strncpy (buf, startp, endp - startp);
 340               buf[endp - startp] = '\0';
 341
 342               {
 343                 DIR *dirp = NULL;
 344                 int dirname_length = strlen (buf);
 345
 346                 dirp = opendir (buf);
 347                 if (dirp == NULL)
 348                   return;
 349
 350                 for (;;)
 351                   {
 352                     struct dirent *direntp = readdir (dirp);
 353
 354                     if (!direntp)
 355                       break;
 356
 357                     if (direntp->d_name[0] != '.')
 358                       {
 359                         char *name = (char *) alloca (dirname_length
 360                                              + strlen (direntp->d_name) + 2);
 361                         strcpy (name, buf);
 362                         if (! IS_DIR_SEPARATOR (name[dirname_length-1]))
 363                           {
 364                             name[dirname_length] = DIR_SEPARATOR;
 365                             name[dirname_length+1] = 0;
 366                           }
 367                         strcat (name, direntp->d_name);
 368                         add_entry (&extensions, name, 0);
 369                       }
 370                   }
 371                 if (dirp)
 372                   closedir (dirp);
 373               }
 374
 375               if (! *endp)
 376                 break;
 377               ++endp;
 378               startp = endp;
 379             }
 380           else
 381             ++endp;
 382         }
 383     }
 384 }
 385
 386 /* Call this when -I is seen on the command line.  */
 387 void
 388 jcf_path_include_arg (const char *path)
 389 {
 390   add_entry (&include_dirs, path, 0);
 391 }
 392
 393 /* We `seal' the path by linking everything into one big list.  Then
 394    we provide a way to iterate through the sealed list.  If PRINT is
 395    true then we print the final class path to stderr.  */
 396 void
 397 jcf_path_seal (int print)
 398 {
 399   struct entry *secondary;
 400
 401   sealed = include_dirs;
 402   include_dirs = NULL;
 403
 404   if (classpath_user)
 405     {
 406       secondary = classpath_user;
 407       classpath_user = NULL;
 408     }
 409   else
 410     {
 411       if (! classpath_env)
 412         add_entry (&classpath_env, ".", 0);
 413
 414       secondary = classpath_env;
 415       classpath_env = NULL;
 416     }
 417
 418
 419   free_entry (&classpath_user);
 420   free_entry (&classpath_env);
 421
 422   append_entry (&sealed, secondary);
 423   append_entry (&sealed, sys_dirs);
 424   append_entry (&sealed, extensions);
 425   sys_dirs = NULL;
 426   extensions = NULL;
 427
 428   if (print)
 429     {
 430       struct entry *ent;
 431       fprintf (stderr, "Class path starts here:\n");
 432       for (ent = sealed; ent; ent = ent->next)
 433         {
 434           fprintf (stderr, "    %s", ent->name);
 435           if ((ent->flags & FLAG_SYSTEM))
 436             fprintf (stderr, " (system)");
 437           if ((ent->flags & FLAG_ZIP))
 438             fprintf (stderr, " (zip)");
 439           fprintf (stderr, "\n");
 440         }
 441     }
 442 }
 443
 444 void *
 445 jcf_path_start (void)
 446 {
 447   return (void *) sealed;
 448 }
 449
 450 void *
 451 jcf_path_next (void *x)
 452 {
 453   struct entry *ent = (struct entry *) x;
 454   return (void *) ent->next;
 455 }
 456
 457 static const char
 458 PATH_SEPARATOR_STR[] = {PATH_SEPARATOR, '\0'};
 459
 460 char *
 461 jcf_path_compute (const char *prefix)
 462 {
 463   struct entry *iter;
 464   char *result;
 465   int length = strlen (prefix) + 1;
 466   int first;
 467
 468   for (iter = sealed; iter != NULL; iter = iter->next)
 469     length += strlen (iter->name) + 1;
 470
 471   result = (char *) xmalloc (length);
 472   strcpy (result, prefix);
 473   first = 1;
 474   for (iter = sealed; iter != NULL; iter = iter->next)
 475     {
 476       if (! first)
 477         strcat (result, PATH_SEPARATOR_STR);
 478       first = 0;
 479       strcat (result, iter->name);
 480       /* Ugly: we want to strip the '/' from zip entries when
 481          computing a string classpath.  */
 482       if ((iter->flags & FLAG_ZIP) != 0)
 483         result[strlen (result) - 1] = '\0';
 484     }
 485
 486   return result;
 487 }
 488
 489 /* We guarantee that the return path will either be a zip file, or it
 490    will end with a directory separator.  */
 491 char *
 492 jcf_path_name (void *x)
 493 {
 494   struct entry *ent = (struct entry *) x;
 495   return ent->name;
 496 }
 497
 498 int
 499 jcf_path_is_zipfile (void *x)
 500 {
 501   struct entry *ent = (struct entry *) x;
 502   return (ent->flags & FLAG_ZIP);
 503 }
 504
 505 int
 506 jcf_path_is_system (void *x)
 507 {
 508   struct entry *ent = (struct entry *) x;
 509   return (ent->flags & FLAG_SYSTEM);
 510 }
 511
 512 int
 513 jcf_path_max_len (void)
 514 {
 515   return longest_path;
 516 }