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 /* Execute one program.  Returns NULL on success.  On error returns an
 404    error string (typically just the name of a system call); the error
 405    string is statically allocated.
 406
 407    OBJ          Returned by pex_init.
 408
 409    FLAGS        As above.
 410
 411    EXECUTABLE   The program to execute.
 412
 413    ARGV         NULL terminated array of arguments to pass to the program.
 414
 415    OUTNAME      Sets the output file name as follows:
 416
 417                 PEX_SUFFIX set (OUTNAME may not be NULL):
 418                   TEMPBASE parameter to pex_init not NULL:
 419                     Output file name is the concatenation of TEMPBASE
 420                     and OUTNAME.
 421                   TEMPBASE is NULL:
 422                     Output file name is a random file name ending in
 423                     OUTNAME.
 424                 PEX_SUFFIX not set:
 425                   OUTNAME not NULL:
 426                     Output file name is OUTNAME.
 427                   OUTNAME NULL, TEMPBASE not NULL:
 428                     Output file name is randomly chosen using
 429                     TEMPBASE.
 430                   OUTNAME NULL, TEMPBASE NULL:
 431                     Output file name is randomly chosen.
 432
 433                 If PEX_LAST is not set, the output file name is the
 434                 name to use for a temporary file holding stdout, if
 435                 any (there will not be a file if PEX_USE_PIPES is set
 436                 and the system supports pipes).  If a file is used, it
 437                 will be removed when no longer needed unless
 438                 PEX_SAVE_TEMPS is set.
 439
 440                 If PEX_LAST is set, and OUTNAME is not NULL, standard
 441                 output is written to the output file name.  The file
 442                 will not be removed.  If PEX_LAST and PEX_SUFFIX are
 443                 both set, TEMPBASE may not be NULL.
 444
 445    ERRNAME      If not NULL, this is the name of a file to which
 446                 standard error is written.  If NULL, standard error of
 447                 the program is standard error of the caller.
 448
 449    ERR          On an error return, *ERR is set to an errno value, or
 450                 to 0 if there is no relevant errno.
 451 */
 452
 453 extern const char *pex_run (struct pex_obj *obj, int flags,
 454                             const char *executable, char * const *argv,
 455                             const char *outname, const char *errname,
 456                             int *err);
 457
 458 /* As for pex_run (), but takes an extra parameter to enable the
 459    environment for the child process to be specified.
 460
 461    ENV          The environment for the child process, specified as
 462                 an array of character pointers.  Each element of the
 463                 array should point to a string of the form VAR=VALUE,
 464                 with the exception of the last element which must be
 465                 a null pointer.
 466 */
 467
 468 extern const char *pex_run_in_environment (struct pex_obj *obj, int flags,
 469                                            const char *executable,
 470                                            char * const *argv,
 471                                            char * const *env,
 472                                            const char *outname,
 473                                            const char *errname, int *err);
 474
 475 /* Return a `FILE' pointer FP for the standard input of the first
 476    program in the pipeline; FP is opened for writing.  You must have
 477    passed `PEX_USE_PIPES' to the `pex_init' call that returned OBJ.
 478    You must close FP yourself with `fclose' to indicate that the
 479    pipeline's input is complete.
 480
 481    The file descriptor underlying FP is marked not to be inherited by
 482    child processes.
 483
 484    This call is not supported on systems which do not support pipes;
 485    it returns with an error.  (We could implement it by writing a
 486    temporary file, but then you would need to write all your data and
 487    close FP before your first call to `pex_run' -- and that wouldn't
 488    work on systems that do support pipes: the pipe would fill up, and
 489    you would block.  So there isn't any easy way to conceal the
 490    differences between the two types of systems.)
 491
 492    If you call both `pex_write_input' and `pex_read_output', be
 493    careful to avoid deadlock.  If the output pipe fills up, so that
 494    each program in the pipeline is waiting for the next to read more
 495    data, and you fill the input pipe by writing more data to FP, then
 496    there is no way to make progress: the only process that could read
 497    data from the output pipe is you, but you are blocked on the input
 498    pipe.  */
 499
 500 extern FILE *pex_write_input (struct pex_obj *obj, int binary);
 501
 502 /* Return a stream for a temporary file to pass to the first program
 503    in the pipeline as input.  The file name is chosen as for pex_run.
 504    pex_run closes the file automatically; don't close it yourself.  */
 505
 506 extern FILE *pex_input_file (struct pex_obj *obj, int flags,
 507                              const char *in_name);
 508
 509 /* Return a stream for a pipe connected to the standard input of the
 510    first program in the pipeline.  You must have passed
 511    `PEX_USE_PIPES' to `pex_init'.  Close the returned stream
 512    yourself.  */
 513
 514 extern FILE *pex_input_pipe (struct pex_obj *obj, int binary);
 515
 516 /* Read the standard output of the last program to be executed.
 517    pex_run can not be called after this.  BINARY should be non-zero if
 518    the file should be opened in binary mode; this is ignored on Unix.
 519    Returns NULL on error.  Don't call fclose on the returned FILE; it
 520    will be closed by pex_free.  */
 521
 522 extern FILE *pex_read_output (struct pex_obj *, int binary);
 523
 524 /* Return exit status of all programs in VECTOR.  COUNT indicates the
 525    size of VECTOR.  The status codes in the vector are in the order of
 526    the calls to pex_run.  Returns 0 on error, 1 on success.  */
 527
 528 extern int pex_get_status (struct pex_obj *, int count, int *vector);
 529
 530 /* Return times of all programs in VECTOR.  COUNT indicates the size
 531    of VECTOR.  struct pex_time is really just struct timeval, but that
 532    is not portable to all systems.  Returns 0 on error, 1 on
 533    success.  */
 534
 535 struct pex_time
 536 {
 537   unsigned long user_seconds;
 538   unsigned long user_microseconds;
 539   unsigned long system_seconds;
 540   unsigned long system_microseconds;
 541 };
 542
 543 extern int pex_get_times (struct pex_obj *, int count,
 544                           struct pex_time *vector);
 545
 546 /* Clean up a pex_obj.  */
 547
 548 extern void pex_free (struct pex_obj *);
 549
 550 /* Just execute one program.  Return value is as for pex_run.
 551    FLAGS        Combination of PEX_SEARCH and PEX_STDERR_TO_STDOUT.
 552    EXECUTABLE   As for pex_run.
 553    ARGV         As for pex_run.
 554    PNAME        As for pex_init.
 555    OUTNAME      As for pex_run when PEX_LAST is set.
 556    ERRNAME      As for pex_run.
 557    STATUS       Set to exit status on success.
 558    ERR          As for pex_run.
 559 */
 560
 561 extern const char *pex_one (int flags, const char *executable,
 562                             char * const *argv, const char *pname,
 563                             const char *outname, const char *errname,
 564                             int *status, int *err);
 565
 566 /* pexecute and pwait are the old pexecute interface, still here for
 567    backward compatibility.  Don't use these for new code.  Instead,
 568    use pex_init/pex_run/pex_get_status/pex_free, or pex_one.  */
 569
 570 /* Definitions used by the pexecute routine.  */
 571
 572 #define PEXECUTE_FIRST   1
 573 #define PEXECUTE_LAST    2
 574 #define PEXECUTE_ONE     (PEXECUTE_FIRST + PEXECUTE_LAST)
 575 #define PEXECUTE_SEARCH  4
 576 #define PEXECUTE_VERBOSE 8
 577
 578 /* Execute a program.  */
 579
 580 extern int pexecute (const char *, char * const *, const char *,
 581                      const char *, char **, char **, int);
 582
 583 /* Wait for pexecute to finish.  */
 584
 585 extern int pwait (int, int *, int);
 586
 587 #if !HAVE_DECL_ASPRINTF
 588 /* Like sprintf but provides a pointer to malloc'd storage, which must
 589    be freed by the caller.  */
 590
 591 extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;
 592 #endif
 593
 594 #if !HAVE_DECL_VASPRINTF
 595 /* Like vsprintf but provides a pointer to malloc'd storage, which
 596    must be freed by the caller.  */
 597
 598 extern int vasprintf (char **, const char *, va_list) ATTRIBUTE_PRINTF(2,0);
 599 #endif
 600
 601 #if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 602 /* Like sprintf but prints at most N characters.  */
 603 extern int snprintf (char *, size_t, const char *, ...) ATTRIBUTE_PRINTF_3;
 604 #endif
 605
 606 #if defined(HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 607 /* Like vsprintf but prints at most N characters.  */
 608 extern int vsnprintf (char *, size_t, const char *, va_list) ATTRIBUTE_PRINTF(3,0);
 609 #endif
 610
 611 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 612 /* Compare version strings.  */
 613 extern int strverscmp (const char *, const char *);
 614 #endif
 615
 616 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 617
 618 /* Drastically simplified alloca configurator.  If we're using GCC,
 619    we use __builtin_alloca; otherwise we use the C alloca.  The C
 620    alloca is always available.  You can override GCC by defining
 621    USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
 622    also set/unset as it is often used to indicate whether code needs
 623    to call alloca(0).  */
 624 extern void *C_alloca (size_t) ATTRIBUTE_MALLOC;
 625 #undef alloca
 626 #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
 627 # define alloca(x) __builtin_alloca(x)
 628 # undef C_ALLOCA
 629 # define ASTRDUP(X) \
 630   (__extension__ ({ const char *const libiberty_optr = (X); \
 631    const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
 632    char *const libiberty_nptr = (char *const) alloca (libiberty_len); \
 633    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
 634 #else
 635 # define alloca(x) C_alloca(x)
 636 # undef USE_C_ALLOCA
 637 # define USE_C_ALLOCA 1
 638 # undef C_ALLOCA
 639 # define C_ALLOCA 1
 640 extern const char *libiberty_optr;
 641 extern char *libiberty_nptr;
 642 extern unsigned long libiberty_len;
 643 # define ASTRDUP(X) \
 644   (libiberty_optr = (X), \
 645    libiberty_len = strlen (libiberty_optr) + 1, \
 646    libiberty_nptr = (char *) alloca (libiberty_len), \
 647    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
 648 #endif
 649
 650 #ifdef __cplusplus
 651 }
 652 #endif
 653
 654
 655 #endif /* ! defined (LIBIBERTY_H) */