include/libiberty.h

   1 /* Function declarations for libiberty.
   2
   3    Copyright 2001, 2002, 2005 Free Software Foundation, Inc.
   4
   5    Note - certain prototypes declared in this header file are for
   6    functions whoes implementation copyright does not belong to the
   7    FSF.  Those prototypes are present in this file for reference
   8    purposes only and their presence in this file should not construed
   9    as an indication of ownership by the FSF of the implementation of
  10    those functions in any way or form whatsoever.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 2, or (at your option)
  15    any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 51 Franklin Street - Fifth Floor,
  25    Boston, MA 02110-1301, USA.
  26
  27    Written by Cygnus Support, 1994.
  28
  29    The libiberty library provides a number of functions which are
  30    missing on some operating systems.  We do not declare those here,
  31    to avoid conflicts with the system header files on operating
  32    systems that do support those functions.  In this file we only
  33    declare those functions which are specific to libiberty.  */
  34
  35 #ifndef LIBIBERTY_H
  36 #define LIBIBERTY_H
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 #include "ansidecl.h"
  43
  44 /* Get a definition for size_t.  */
  45 #include <stddef.h>
  46 /* Get a definition for va_list.  */
  47 #include <stdarg.h>
  48
  49 #include <stdio.h>
  50
  51 /* If the OS supports it, ensure that the supplied stream is setup to
  52    avoid any multi-threaded locking.  Otherwise leave the FILE pointer
  53    unchanged.  If the stream is NULL do nothing.  */
  54
  55 extern void unlock_stream (FILE *);
  56
  57 /* If the OS supports it, ensure that the standard I/O streams, stdin,
  58    stdout and stderr are setup to avoid any multi-threaded locking.
  59    Otherwise do nothing.  */
  60
  61 extern void unlock_std_streams (void);
  62
  63 /* Open and return a FILE pointer.  If the OS supports it, ensure that
  64    the stream is setup to avoid any multi-threaded locking.  Otherwise
  65    return the FILE pointer unchanged.  */
  66
  67 extern FILE *fopen_unlocked (const char *, const char *);
  68 extern FILE *fdopen_unlocked (int, const char *);
  69 extern FILE *freopen_unlocked (const char *, const char *, FILE *);
  70
  71 /* Build an argument vector from a string.  Allocates memory using
  72    malloc.  Use freeargv to free the vector.  */
  73
  74 extern char **buildargv (const char *) ATTRIBUTE_MALLOC;
  75
  76 /* Free a vector returned by buildargv.  */
  77
  78 extern void freeargv (char **);
  79
  80 /* Duplicate an argument vector. Allocates memory using malloc.  Use
  81    freeargv to free the vector.  */
  82
  83 extern char **dupargv (char **) ATTRIBUTE_MALLOC;
  84
  85 /* Expand "@file" arguments in argv.  */
  86
  87 extern void expandargv PARAMS ((int *, char ***));
  88
  89 /* Write argv to an @-file, inserting necessary quoting.  */
  90
  91 extern int writeargv PARAMS ((char **, FILE *));
  92
  93 /* Return the last component of a path name.  Note that we can't use a
  94    prototype here because the parameter is declared inconsistently
  95    across different systems, sometimes as "char *" and sometimes as
  96    "const char *" */
  97
  98 /* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is
  99    undefined, we haven't run the autoconf check so provide the
 100    declaration without arguments.  If it is 0, we checked and failed
 101    to find the declaration so provide a fully prototyped one.  If it
 102    is 1, we found it so don't provide any declaration at all.  */
 103 #if !HAVE_DECL_BASENAME
 104 #if defined (__GNU_LIBRARY__ ) || defined (__linux__) || defined (__FreeBSD__) || defined (__OpenBSD__) || defined(__NetBSD__) || defined (__CYGWIN__) || defined (__CYGWIN32__) || defined (__MINGW32__) || defined (HAVE_DECL_BASENAME)
 105 extern char *basename (const char *);
 106 #else
 107 /* Do not allow basename to be used if there is no prototype seen.  We
 108    either need to use the above prototype or have one from
 109    autoconf which would result in HAVE_DECL_BASENAME being set.  */
 110 #define basename basename_cannot_be_used_without_a_prototype
 111 #endif
 112 #endif
 113
 114 /* A well-defined basename () that is always compiled in.  */
 115
 116 extern const char *lbasename (const char *);
 117
 118 /* A well-defined realpath () that is always compiled in.  */
 119
 120 extern char *lrealpath (const char *);
 121
 122 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 123    the last argument of this function, to terminate the list of
 124    strings.  Allocates memory using xmalloc.  */
 125
 126 extern char *concat (const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_SENTINEL;
 127
 128 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 129    the last argument of this function, to terminate the list of
 130    strings.  Allocates memory using xmalloc.  The first argument is
 131    not one of the strings to be concatenated, but if not NULL is a
 132    pointer to be freed after the new string is created, similar to the
 133    way xrealloc works.  */
 134
 135 extern char *reconcat (char *, const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_SENTINEL;
 136
 137 /* Determine the length of concatenating an arbitrary number of
 138    strings.  You must pass NULL as the last argument of this function,
 139    to terminate the list of strings.  */
 140
 141 extern unsigned long concat_length (const char *, ...) ATTRIBUTE_SENTINEL;
 142
 143 /* Concatenate an arbitrary number of strings into a SUPPLIED area of
 144    memory.  You must pass NULL as the last argument of this function,
 145    to terminate the list of strings.  The supplied memory is assumed
 146    to be large enough.  */
 147
 148 extern char *concat_copy (char *, const char *, ...) ATTRIBUTE_SENTINEL;
 149
 150 /* Concatenate an arbitrary number of strings into a GLOBAL area of
 151    memory.  You must pass NULL as the last argument of this function,
 152    to terminate the list of strings.  The supplied memory is assumed
 153    to be large enough.  */
 154
 155 extern char *concat_copy2 (const char *, ...) ATTRIBUTE_SENTINEL;
 156
 157 /* This is the global area used by concat_copy2.  */
 158
 159 extern char *libiberty_concat_ptr;
 160
 161 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 162    the last argument of this function, to terminate the list of
 163    strings.  Allocates memory using alloca.  The arguments are
 164    evaluated twice!  */
 165 #define ACONCAT(ACONCAT_PARAMS) \
 166   (libiberty_concat_ptr = (char *) alloca (concat_length ACONCAT_PARAMS + 1), \
 167    concat_copy2 ACONCAT_PARAMS)
 168
 169 /* Check whether two file descriptors refer to the same file.  */
 170
 171 extern int fdmatch (int fd1, int fd2);
 172
 173 /* Return the position of the first bit set in the argument.  */
 174 /* Prototypes vary from system to system, so we only provide a
 175    prototype on systems where we know that we need it.  */
 176 #if defined (HAVE_DECL_FFS) && !HAVE_DECL_FFS
 177 extern int ffs(int);
 178 #endif
 179
 180 /* Get the working directory.  The result is cached, so don't call
 181    chdir() between calls to getpwd().  */
 182
 183 extern char * getpwd (void);
 184
 185 /* Get the current time.  */
 186 /* Prototypes vary from system to system, so we only provide a
 187    prototype on systems where we know that we need it.  */
 188 #ifdef __MINGW32__
 189 /* Forward declaration to avoid #include <sys/time.h>.   */
 190 struct timeval;
 191 extern int gettimeofday (struct timeval *, void *);
 192 #endif
 193
 194 /* Get the amount of time the process has run, in microseconds.  */
 195
 196 extern long get_run_time (void);
 197
 198 /* Generate a relocated path to some installation directory.  Allocates
 199    return value using malloc.  */
 200
 201 extern char *make_relative_prefix (const char *, const char *,
 202                                    const char *) ATTRIBUTE_MALLOC;
 203
 204 /* Generate a relocated path to some installation directory without
 205    attempting to follow any soft links.  Allocates
 206    return value using malloc.  */
 207
 208 extern char *make_relative_prefix_ignore_links (const char *, const char *,
 209                                                 const char *) ATTRIBUTE_MALLOC;
 210
 211 /* Choose a temporary directory to use for scratch files.  */
 212
 213 extern char *choose_temp_base (void) ATTRIBUTE_MALLOC;
 214
 215 /* Return a temporary file name or NULL if unable to create one.  */
 216
 217 extern char *make_temp_file (const char *) ATTRIBUTE_MALLOC;
 218
 219 /* Remove a link to a file unless it is special. */
 220
 221 extern int unlink_if_ordinary (const char *);
 222
 223 /* Allocate memory filled with spaces.  Allocates using malloc.  */
 224
 225 extern const char *spaces (int count);
 226
 227 /* Return the maximum error number for which strerror will return a
 228    string.  */
 229
 230 extern int errno_max (void);
 231
 232 /* Return the name of an errno value (e.g., strerrno (EINVAL) returns
 233    "EINVAL").  */
 234
 235 extern const char *strerrno (int);
 236
 237 /* Given the name of an errno value, return the value.  */
 238
 239 extern int strtoerrno (const char *);
 240
 241 /* ANSI's strerror(), but more robust.  */
 242
 243 extern char *xstrerror (int);
 244
 245 /* Return the maximum signal number for which strsignal will return a
 246    string.  */
 247
 248 extern int signo_max (void);
 249
 250 /* Return a signal message string for a signal number
 251    (e.g., strsignal (SIGHUP) returns something like "Hangup").  */
 252 /* This is commented out as it can conflict with one in system headers.
 253    We still document its existence though.  */
 254
 255 /*extern const char *strsignal (int);*/
 256
 257 /* Return the name of a signal number (e.g., strsigno (SIGHUP) returns
 258    "SIGHUP").  */
 259
 260 extern const char *strsigno (int);
 261
 262 /* Given the name of a signal, return its number.  */
 263
 264 extern int strtosigno (const char *);
 265
 266 /* Register a function to be run by xexit.  Returns 0 on success.  */
 267
 268 extern int xatexit (void (*fn) (void));
 269
 270 /* Exit, calling all the functions registered with xatexit.  */
 271
 272 extern void xexit (int status) ATTRIBUTE_NORETURN;
 273
 274 /* Set the program name used by xmalloc.  */
 275
 276 extern void xmalloc_set_program_name (const char *);
 277
 278 /* Report an allocation failure.  */
 279 extern void xmalloc_failed (size_t) ATTRIBUTE_NORETURN;
 280
 281 /* Allocate memory without fail.  If malloc fails, this will print a
 282    message to stderr (using the name set by xmalloc_set_program_name,
 283    if any) and then call xexit.  */
 284
 285 extern void *xmalloc (size_t) ATTRIBUTE_MALLOC;
 286
 287 /* Reallocate memory without fail.  This works like xmalloc.  Note,
 288    realloc type functions are not suitable for attribute malloc since
 289    they may return the same address across multiple calls. */
 290
 291 extern void *xrealloc (void *, size_t);
 292
 293 /* Allocate memory without fail and set it to zero.  This works like
 294    xmalloc.  */
 295
 296 extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC;
 297
 298 /* Copy a string into a memory buffer without fail.  */
 299
 300 extern char *xstrdup (const char *) ATTRIBUTE_MALLOC;
 301
 302 /* Copy at most N characters from string into a buffer without fail.  */
 303
 304 extern char *xstrndup (const char *, size_t) ATTRIBUTE_MALLOC;
 305
 306 /* Copy an existing memory buffer to a new memory buffer without fail.  */
 307
 308 extern void *xmemdup (const void *, size_t, size_t) ATTRIBUTE_MALLOC;
 309
 310 /* Physical memory routines.  Return values are in BYTES.  */
 311 extern double physmem_total (void);
 312 extern double physmem_available (void);
 313
 314
 315 /* These macros provide a K&R/C89/C++-friendly way of allocating structures
 316    with nice encapsulation.  The XDELETE*() macros are technically
 317    superfluous, but provided here for symmetry.  Using them consistently
 318    makes it easier to update client code to use different allocators such
 319    as new/delete and new[]/delete[].  */
 320
 321 /* Scalar allocators.  */
 322
 323 #define XNEW(T)                 ((T *) xmalloc (sizeof (T)))
 324 #define XCNEW(T)                ((T *) xcalloc (1, sizeof (T)))
 325 #define XDELETE(P)              free ((void*) (P))
 326
 327 /* Array allocators.  */
 328
 329 #define XNEWVEC(T, N)           ((T *) xmalloc (sizeof (T) * (N)))
 330 #define XCNEWVEC(T, N)          ((T *) xcalloc ((N), sizeof (T)))
 331 #define XRESIZEVEC(T, P, N)     ((T *) xrealloc ((void *) (P), sizeof (T) * (N)))
 332 #define XDELETEVEC(P)           free ((void*) (P))
 333
 334 /* Allocators for variable-sized structures and raw buffers.  */
 335
 336 #define XNEWVAR(T, S)           ((T *) xmalloc ((S)))
 337 #define XCNEWVAR(T, S)          ((T *) xcalloc (1, (S)))
 338 #define XRESIZEVAR(T, P, S)     ((T *) xrealloc ((P), (S)))
 339
 340 /* Type-safe obstack allocator.  */
 341
 342 #define XOBNEW(O, T)            ((T *) obstack_alloc ((O), sizeof (T)))
 343 #define XOBFINISH(O, T)         ((T) obstack_finish ((O)))
 344
 345 /* hex character manipulation routines */
 346
 347 #define _hex_array_size 256
 348 #define _hex_bad        99
 349 extern const unsigned char _hex_value[_hex_array_size];
 350 extern void hex_init (void);
 351 #define hex_p(c)        (hex_value (c) != _hex_bad)
 352 /* If you change this, note well: Some code relies on side effects in
 353    the argument being performed exactly once.  */
 354 #define hex_value(c)    ((unsigned int) _hex_value[(unsigned char) (c)])
 355
 356 /* Flags for pex_init.  These are bits to be or'ed together.  */
 357
 358 /* Record subprocess times, if possible.  */
 359 #define PEX_RECORD_TIMES        0x1
 360
 361 /* Use pipes for communication between processes, if possible.  */
 362 #define PEX_USE_PIPES           0x2
 363
 364 /* Save files used for communication between processes.  */
 365 #define PEX_SAVE_TEMPS          0x4
 366
 367 /* Prepare to execute one or more programs, with standard output of
 368    each program fed to standard input of the next.
 369    FLAGS        As above.
 370    PNAME        The name of the program to report in error messages.
 371    TEMPBASE     A base name to use for temporary files; may be NULL to
 372                 use a random name.
 373    Returns NULL on error.  */
 374
 375 extern struct pex_obj *pex_init (int flags, const char *pname,
 376                                  const char *tempbase);
 377
 378 /* Flags for pex_run.  These are bits to be or'ed together.  */
 379
 380 /* Last program in pipeline.  Standard output of program goes to
 381    OUTNAME, or, if OUTNAME is NULL, to standard output of caller.  Do
 382    not set this if you want to call pex_read_output.  After this is
 383    set, pex_run may no longer be called with the same struct
 384    pex_obj.  */
 385 #define PEX_LAST                0x1
 386
 387 /* Search for program in executable search path.  */
 388 #define PEX_SEARCH              0x2
 389
 390 /* OUTNAME is a suffix.  */
 391 #define PEX_SUFFIX              0x4
 392
 393 /* Send program's standard error to standard output.  */
 394 #define PEX_STDERR_TO_STDOUT    0x8
 395
 396 /* Input file should be opened in binary mode.  This flag is ignored
 397    on Unix.  */
 398 #define PEX_BINARY_INPUT        0x10
 399
 400 /* Output file should be opened in binary mode.  This flag is ignored
 401    on Unix.  For proper behaviour PEX_BINARY_INPUT and
 402    PEX_BINARY_OUTPUT have to match appropriately--i.e., a call using
 403    PEX_BINARY_OUTPUT should be followed by a call using
 404    PEX_BINARY_INPUT.  */
 405 #define PEX_BINARY_OUTPUT       0x20
 406
 407 /* Capture stderr to a pipe.  The output can be read by
 408    calling pex_read_err and reading from the returned
 409    FILE object.  This flag may be specified only for
 410    the last program in a pipeline.
 411
 412    This flag is supported only on Unix and Windows.  */
 413 #define PEX_STDERR_TO_PIPE      0x40
 414
 415 /* Capture stderr in binary mode.  This flag is ignored
 416    on Unix.  */
 417 #define PEX_BINARY_ERROR        0x80
 418
 419
 420 /* Execute one program.  Returns NULL on success.  On error returns an
 421    error string (typically just the name of a system call); the error
 422    string is statically allocated.
 423
 424    OBJ          Returned by pex_init.
 425
 426    FLAGS        As above.
 427
 428    EXECUTABLE   The program to execute.
 429
 430    ARGV         NULL terminated array of arguments to pass to the program.
 431
 432    OUTNAME      Sets the output file name as follows:
 433
 434                 PEX_SUFFIX set (OUTNAME may not be NULL):
 435                   TEMPBASE parameter to pex_init not NULL:
 436                     Output file name is the concatenation of TEMPBASE
 437                     and OUTNAME.
 438                   TEMPBASE is NULL:
 439                     Output file name is a random file name ending in
 440                     OUTNAME.
 441                 PEX_SUFFIX not set:
 442                   OUTNAME not NULL:
 443                     Output file name is OUTNAME.
 444                   OUTNAME NULL, TEMPBASE not NULL:
 445                     Output file name is randomly chosen using
 446                     TEMPBASE.
 447                   OUTNAME NULL, TEMPBASE NULL:
 448                     Output file name is randomly chosen.
 449
 450                 If PEX_LAST is not set, the output file name is the
 451                 name to use for a temporary file holding stdout, if
 452                 any (there will not be a file if PEX_USE_PIPES is set
 453                 and the system supports pipes).  If a file is used, it
 454                 will be removed when no longer needed unless
 455                 PEX_SAVE_TEMPS is set.
 456
 457                 If PEX_LAST is set, and OUTNAME is not NULL, standard
 458                 output is written to the output file name.  The file
 459                 will not be removed.  If PEX_LAST and PEX_SUFFIX are
 460                 both set, TEMPBASE may not be NULL.
 461
 462    ERRNAME      If not NULL, this is the name of a file to which
 463                 standard error is written.  If NULL, standard error of
 464                 the program is standard error of the caller.
 465
 466    ERR          On an error return, *ERR is set to an errno value, or
 467                 to 0 if there is no relevant errno.
 468 */
 469
 470 extern const char *pex_run (struct pex_obj *obj, int flags,
 471                             const char *executable, char * const *argv,
 472                             const char *outname, const char *errname,
 473                             int *err);
 474
 475 /* As for pex_run (), but takes an extra parameter to enable the
 476    environment for the child process to be specified.
 477
 478    ENV          The environment for the child process, specified as
 479                 an array of character pointers.  Each element of the
 480                 array should point to a string of the form VAR=VALUE,
 481                 with the exception of the last element which must be
 482                 a null pointer.
 483 */
 484
 485 extern const char *pex_run_in_environment (struct pex_obj *obj, int flags,
 486                                            const char *executable,
 487                                            char * const *argv,
 488                                            char * const *env,
 489                                            const char *outname,
 490                                            const char *errname, int *err);
 491
 492 /* Return a stream for a temporary file to pass to the first program
 493    in the pipeline as input.  The file name is chosen as for pex_run.
 494    pex_run closes the file automatically; don't close it yourself.  */
 495
 496 extern FILE *pex_input_file (struct pex_obj *obj, int flags,
 497                              const char *in_name);
 498
 499 /* Return a stream for a pipe connected to the standard input of the
 500    first program in the pipeline.  You must have passed
 501    `PEX_USE_PIPES' to `pex_init'.  Close the returned stream
 502    yourself.  */
 503
 504 extern FILE *pex_input_pipe (struct pex_obj *obj, int binary);
 505
 506 /* Read the standard output of the last program to be executed.
 507    pex_run can not be called after this.  BINARY should be non-zero if
 508    the file should be opened in binary mode; this is ignored on Unix.
 509    Returns NULL on error.  Don't call fclose on the returned FILE; it
 510    will be closed by pex_free.  */
 511
 512 extern FILE *pex_read_output (struct pex_obj *, int binary);
 513
 514 /* Read the standard error of the last program to be executed.
 515    pex_run can not be called after this.  BINARY should be non-zero if
 516    the file should be opened in binary mode; this is ignored on Unix.
 517    Returns NULL on error.  Don't call fclose on the returned FILE; it
 518    will be closed by pex_free.  */
 519
 520 extern FILE *pex_read_err (struct pex_obj *, int binary);
 521
 522 /* Return exit status of all programs in VECTOR.  COUNT indicates the
 523    size of VECTOR.  The status codes in the vector are in the order of
 524    the calls to pex_run.  Returns 0 on error, 1 on success.  */
 525
 526 extern int pex_get_status (struct pex_obj *, int count, int *vector);
 527
 528 /* Return times of all programs in VECTOR.  COUNT indicates the size
 529    of VECTOR.  struct pex_time is really just struct timeval, but that
 530    is not portable to all systems.  Returns 0 on error, 1 on
 531    success.  */
 532
 533 struct pex_time
 534 {
 535   unsigned long user_seconds;
 536   unsigned long user_microseconds;
 537   unsigned long system_seconds;
 538   unsigned long system_microseconds;
 539 };
 540
 541 extern int pex_get_times (struct pex_obj *, int count,
 542                           struct pex_time *vector);
 543
 544 /* Clean up a pex_obj.  */
 545
 546 extern void pex_free (struct pex_obj *);
 547
 548 /* Just execute one program.  Return value is as for pex_run.
 549    FLAGS        Combination of PEX_SEARCH and PEX_STDERR_TO_STDOUT.
 550    EXECUTABLE   As for pex_run.
 551    ARGV         As for pex_run.
 552    PNAME        As for pex_init.
 553    OUTNAME      As for pex_run when PEX_LAST is set.
 554    ERRNAME      As for pex_run.
 555    STATUS       Set to exit status on success.
 556    ERR          As for pex_run.
 557 */
 558
 559 extern const char *pex_one (int flags, const char *executable,
 560                             char * const *argv, const char *pname,
 561                             const char *outname, const char *errname,
 562                             int *status, int *err);
 563
 564 /* pexecute and pwait are the old pexecute interface, still here for
 565    backward compatibility.  Don't use these for new code.  Instead,
 566    use pex_init/pex_run/pex_get_status/pex_free, or pex_one.  */
 567
 568 /* Definitions used by the pexecute routine.  */
 569
 570 #define PEXECUTE_FIRST   1
 571 #define PEXECUTE_LAST    2
 572 #define PEXECUTE_ONE     (PEXECUTE_FIRST + PEXECUTE_LAST)
 573 #define PEXECUTE_SEARCH  4
 574 #define PEXECUTE_VERBOSE 8
 575
 576 /* Execute a program.  */
 577
 578 extern int pexecute (const char *, char * const *, const char *,
 579                      const char *, char **, char **, int);
 580
 581 /* Wait for pexecute to finish.  */
 582
 583 extern int pwait (int, int *, int);
 584
 585 #if !HAVE_DECL_ASPRINTF
 586 /* Like sprintf but provides a pointer to malloc'd storage, which must
 587    be freed by the caller.  */
 588
 589 extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;
 590 #endif
 591
 592 #if !HAVE_DECL_VASPRINTF
 593 /* Like vsprintf but provides a pointer to malloc'd storage, which
 594    must be freed by the caller.  */
 595
 596 extern int vasprintf (char **, const char *, va_list) ATTRIBUTE_PRINTF(2,0);
 597 #endif
 598
 599 #if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 600 /* Like sprintf but prints at most N characters.  */
 601 extern int snprintf (char *, size_t, const char *, ...) ATTRIBUTE_PRINTF_3;
 602 #endif
 603
 604 #if defined(HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 605 /* Like vsprintf but prints at most N characters.  */
 606 extern int vsnprintf (char *, size_t, const char *, va_list) ATTRIBUTE_PRINTF(3,0);
 607 #endif
 608
 609 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 610 /* Compare version strings.  */
 611 extern int strverscmp (const char *, const char *);
 612 #endif
 613
 614 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 615
 616 /* Drastically simplified alloca configurator.  If we're using GCC,
 617    we use __builtin_alloca; otherwise we use the C alloca.  The C
 618    alloca is always available.  You can override GCC by defining
 619    USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
 620    also set/unset as it is often used to indicate whether code needs
 621    to call alloca(0).  */
 622 extern void *C_alloca (size_t) ATTRIBUTE_MALLOC;
 623 #undef alloca
 624 #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
 625 # define alloca(x) __builtin_alloca(x)
 626 # undef C_ALLOCA
 627 # define ASTRDUP(X) \
 628   (__extension__ ({ const char *const libiberty_optr = (X); \
 629    const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
 630    char *const libiberty_nptr = (char *const) alloca (libiberty_len); \
 631    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
 632 #else
 633 # define alloca(x) C_alloca(x)
 634 # undef USE_C_ALLOCA
 635 # define USE_C_ALLOCA 1
 636 # undef C_ALLOCA
 637 # define C_ALLOCA 1
 638 extern const char *libiberty_optr;
 639 extern char *libiberty_nptr;
 640 extern unsigned long libiberty_len;
 641 # define ASTRDUP(X) \
 642   (libiberty_optr = (X), \
 643    libiberty_len = strlen (libiberty_optr) + 1, \
 644    libiberty_nptr = (char *) alloca (libiberty_len), \
 645    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
 646 #endif
 647
 648 #ifdef __cplusplus
 649 }
 650 #endif
 651
 652
 653 #endif /* ! defined (LIBIBERTY_H) */