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