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 /* Choose a temporary directory to use for scratch files.  */
 201
 202 extern char *choose_temp_base (void) ATTRIBUTE_MALLOC;
 203
 204 /* Return a temporary file name or NULL if unable to create one.  */
 205
 206 extern char *make_temp_file (const char *) ATTRIBUTE_MALLOC;
 207
 208 /* Remove a link to a file unless it is special. */
 209
 210 extern int unlink_if_ordinary (const char *);
 211
 212 /* Allocate memory filled with spaces.  Allocates using malloc.  */
 213
 214 extern const char *spaces (int count);
 215
 216 /* Return the maximum error number for which strerror will return a
 217    string.  */
 218
 219 extern int errno_max (void);
 220
 221 /* Return the name of an errno value (e.g., strerrno (EINVAL) returns
 222    "EINVAL").  */
 223
 224 extern const char *strerrno (int);
 225
 226 /* Given the name of an errno value, return the value.  */
 227
 228 extern int strtoerrno (const char *);
 229
 230 /* ANSI's strerror(), but more robust.  */
 231
 232 extern char *xstrerror (int);
 233
 234 /* Return the maximum signal number for which strsignal will return a
 235    string.  */
 236
 237 extern int signo_max (void);
 238
 239 /* Return a signal message string for a signal number
 240    (e.g., strsignal (SIGHUP) returns something like "Hangup").  */
 241 /* This is commented out as it can conflict with one in system headers.
 242    We still document its existence though.  */
 243
 244 /*extern const char *strsignal (int);*/
 245
 246 /* Return the name of a signal number (e.g., strsigno (SIGHUP) returns
 247    "SIGHUP").  */
 248
 249 extern const char *strsigno (int);
 250
 251 /* Given the name of a signal, return its number.  */
 252
 253 extern int strtosigno (const char *);
 254
 255 /* Register a function to be run by xexit.  Returns 0 on success.  */
 256
 257 extern int xatexit (void (*fn) (void));
 258
 259 /* Exit, calling all the functions registered with xatexit.  */
 260
 261 extern void xexit (int status) ATTRIBUTE_NORETURN;
 262
 263 /* Set the program name used by xmalloc.  */
 264
 265 extern void xmalloc_set_program_name (const char *);
 266
 267 /* Report an allocation failure.  */
 268 extern void xmalloc_failed (size_t) ATTRIBUTE_NORETURN;
 269
 270 /* Allocate memory without fail.  If malloc fails, this will print a
 271    message to stderr (using the name set by xmalloc_set_program_name,
 272    if any) and then call xexit.  */
 273
 274 extern void *xmalloc (size_t) ATTRIBUTE_MALLOC;
 275
 276 /* Reallocate memory without fail.  This works like xmalloc.  Note,
 277    realloc type functions are not suitable for attribute malloc since
 278    they may return the same address across multiple calls. */
 279
 280 extern void *xrealloc (void *, size_t);
 281
 282 /* Allocate memory without fail and set it to zero.  This works like
 283    xmalloc.  */
 284
 285 extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC;
 286
 287 /* Copy a string into a memory buffer without fail.  */
 288
 289 extern char *xstrdup (const char *) ATTRIBUTE_MALLOC;
 290
 291 /* Copy at most N characters from string into a buffer without fail.  */
 292
 293 extern char *xstrndup (const char *, size_t) ATTRIBUTE_MALLOC;
 294
 295 /* Copy an existing memory buffer to a new memory buffer without fail.  */
 296
 297 extern void *xmemdup (const void *, size_t, size_t) ATTRIBUTE_MALLOC;
 298
 299 /* Physical memory routines.  Return values are in BYTES.  */
 300 extern double physmem_total (void);
 301 extern double physmem_available (void);
 302
 303
 304 /* These macros provide a K&R/C89/C++-friendly way of allocating structures
 305    with nice encapsulation.  The XDELETE*() macros are technically
 306    superfluous, but provided here for symmetry.  Using them consistently
 307    makes it easier to update client code to use different allocators such
 308    as new/delete and new[]/delete[].  */
 309
 310 /* Scalar allocators.  */
 311
 312 #define XNEW(T)                 ((T *) xmalloc (sizeof (T)))
 313 #define XCNEW(T)                ((T *) xcalloc (1, sizeof (T)))
 314 #define XDELETE(P)              free ((void*) (P))
 315
 316 /* Array allocators.  */
 317
 318 #define XNEWVEC(T, N)           ((T *) xmalloc (sizeof (T) * (N)))
 319 #define XCNEWVEC(T, N)          ((T *) xcalloc ((N), sizeof (T)))
 320 #define XRESIZEVEC(T, P, N)     ((T *) xrealloc ((void *) (P), sizeof (T) * (N)))
 321 #define XDELETEVEC(P)           free ((void*) (P))
 322
 323 /* Allocators for variable-sized structures and raw buffers.  */
 324
 325 #define XNEWVAR(T, S)           ((T *) xmalloc ((S)))
 326 #define XCNEWVAR(T, S)          ((T *) xcalloc (1, (S)))
 327 #define XRESIZEVAR(T, P, S)     ((T *) xrealloc ((P), (S)))
 328
 329 /* Type-safe obstack allocator.  */
 330
 331 #define XOBNEW(O, T)            ((T *) obstack_alloc ((O), sizeof (T)))
 332 #define XOBFINISH(O, T)         ((T) obstack_finish ((O)))
 333
 334 /* hex character manipulation routines */
 335
 336 #define _hex_array_size 256
 337 #define _hex_bad        99
 338 extern const unsigned char _hex_value[_hex_array_size];
 339 extern void hex_init (void);
 340 #define hex_p(c)        (hex_value (c) != _hex_bad)
 341 /* If you change this, note well: Some code relies on side effects in
 342    the argument being performed exactly once.  */
 343 #define hex_value(c)    ((unsigned int) _hex_value[(unsigned char) (c)])
 344
 345 /* Flags for pex_init.  These are bits to be or'ed together.  */
 346
 347 /* Record subprocess times, if possible.  */
 348 #define PEX_RECORD_TIMES        0x1
 349
 350 /* Use pipes for communication between processes, if possible.  */
 351 #define PEX_USE_PIPES           0x2
 352
 353 /* Save files used for communication between processes.  */
 354 #define PEX_SAVE_TEMPS          0x4
 355
 356 /* Prepare to execute one or more programs, with standard output of
 357    each program fed to standard input of the next.
 358    FLAGS        As above.
 359    PNAME        The name of the program to report in error messages.
 360    TEMPBASE     A base name to use for temporary files; may be NULL to
 361                 use a random name.
 362    Returns NULL on error.  */
 363
 364 extern struct pex_obj *pex_init (int flags, const char *pname,
 365                                  const char *tempbase);
 366
 367 /* Flags for pex_run.  These are bits to be or'ed together.  */
 368
 369 /* Last program in pipeline.  Standard output of program goes to
 370    OUTNAME, or, if OUTNAME is NULL, to standard output of caller.  Do
 371    not set this if you want to call pex_read_output.  After this is
 372    set, pex_run may no longer be called with the same struct
 373    pex_obj.  */
 374 #define PEX_LAST                0x1
 375
 376 /* Search for program in executable search path.  */
 377 #define PEX_SEARCH              0x2
 378
 379 /* OUTNAME is a suffix.  */
 380 #define PEX_SUFFIX              0x4
 381
 382 /* Send program's standard error to standard output.  */
 383 #define PEX_STDERR_TO_STDOUT    0x8
 384
 385 /* Input file should be opened in binary mode.  This flag is ignored
 386    on Unix.  */
 387 #define PEX_BINARY_INPUT        0x10
 388
 389 /* Output file should be opened in binary mode.  This flag is ignored
 390    on Unix.  For proper behaviour PEX_BINARY_INPUT and
 391    PEX_BINARY_OUTPUT have to match appropriately--i.e., a call using
 392    PEX_BINARY_OUTPUT should be followed by a call using
 393    PEX_BINARY_INPUT.  */
 394 #define PEX_BINARY_OUTPUT       0x20
 395
 396 /* Execute one program.  Returns NULL on success.  On error returns an
 397    error string (typically just the name of a system call); the error
 398    string is statically allocated.
 399
 400    OBJ          Returned by pex_init.
 401
 402    FLAGS        As above.
 403
 404    EXECUTABLE   The program to execute.
 405
 406    ARGV         NULL terminated array of arguments to pass to the program.
 407
 408    OUTNAME      Sets the output file name as follows:
 409
 410                 PEX_SUFFIX set (OUTNAME may not be NULL):
 411                   TEMPBASE parameter to pex_init not NULL:
 412                     Output file name is the concatenation of TEMPBASE
 413                     and OUTNAME.
 414                   TEMPBASE is NULL:
 415                     Output file name is a random file name ending in
 416                     OUTNAME.
 417                 PEX_SUFFIX not set:
 418                   OUTNAME not NULL:
 419                     Output file name is OUTNAME.
 420                   OUTNAME NULL, TEMPBASE not NULL:
 421                     Output file name is randomly chosen using
 422                     TEMPBASE.
 423                   OUTNAME NULL, TEMPBASE NULL:
 424                     Output file name is randomly chosen.
 425
 426                 If PEX_LAST is not set, the output file name is the
 427                 name to use for a temporary file holding stdout, if
 428                 any (there will not be a file if PEX_USE_PIPES is set
 429                 and the system supports pipes).  If a file is used, it
 430                 will be removed when no longer needed unless
 431                 PEX_SAVE_TEMPS is set.
 432
 433                 If PEX_LAST is set, and OUTNAME is not NULL, standard
 434                 output is written to the output file name.  The file
 435                 will not be removed.  If PEX_LAST and PEX_SUFFIX are
 436                 both set, TEMPBASE may not be NULL.
 437
 438    ERRNAME      If not NULL, this is the name of a file to which
 439                 standard error is written.  If NULL, standard error of
 440                 the program is standard error of the caller.
 441
 442    ERR          On an error return, *ERR is set to an errno value, or
 443                 to 0 if there is no relevant errno.
 444 */
 445
 446 extern const char *pex_run (struct pex_obj *obj, int flags,
 447                             const char *executable, char * const *argv,
 448                             const char *outname, const char *errname,
 449                             int *err);
 450
 451 /* As for pex_run (), but takes an extra parameter to enable the
 452    environment for the child process to be specified.
 453
 454    ENV          The environment for the child process, specified as
 455                 an array of character pointers.  Each element of the
 456                 array should point to a string of the form VAR=VALUE,
 457                 with the exception of the last element which must be
 458                 a null pointer.
 459 */
 460
 461 extern const char *pex_run_in_environment (struct pex_obj *obj, int flags,
 462                                            const char *executable,
 463                                            char * const *argv,
 464                                            char * const *env,
 465                                            const char *outname,
 466                                            const char *errname, int *err);
 467
 468 /* Return a `FILE' pointer FP for the standard input of the first
 469    program in the pipeline; FP is opened for writing.  You must have
 470    passed `PEX_USE_PIPES' to the `pex_init' call that returned OBJ.
 471    You must close FP yourself with `fclose' to indicate that the
 472    pipeline's input is complete.
 473
 474    The file descriptor underlying FP is marked not to be inherited by
 475    child processes.
 476
 477    This call is not supported on systems which do not support pipes;
 478    it returns with an error.  (We could implement it by writing a
 479    temporary file, but then you would need to write all your data and
 480    close FP before your first call to `pex_run' -- and that wouldn't
 481    work on systems that do support pipes: the pipe would fill up, and
 482    you would block.  So there isn't any easy way to conceal the
 483    differences between the two types of systems.)
 484
 485    If you call both `pex_write_input' and `pex_read_output', be
 486    careful to avoid deadlock.  If the output pipe fills up, so that
 487    each program in the pipeline is waiting for the next to read more
 488    data, and you fill the input pipe by writing more data to FP, then
 489    there is no way to make progress: the only process that could read
 490    data from the output pipe is you, but you are blocked on the input
 491    pipe.  */
 492
 493 extern FILE *pex_write_input (struct pex_obj *obj, int binary);
 494
 495 /* Return a stream for a temporary file to pass to the first program
 496    in the pipeline as input.  The file name is chosen as for pex_run.
 497    pex_run closes the file automatically; don't close it yourself.  */
 498
 499 extern FILE *pex_input_file (struct pex_obj *obj, int flags,
 500                              const char *in_name);
 501
 502 /* Return a stream for a pipe connected to the standard input of the
 503    first program in the pipeline.  You must have passed
 504    `PEX_USE_PIPES' to `pex_init'.  Close the returned stream
 505    yourself.  */
 506
 507 extern FILE *pex_input_pipe (struct pex_obj *obj, int binary);
 508
 509 /* Read the standard output of the last program to be executed.
 510    pex_run can not be called after this.  BINARY should be non-zero if
 511    the file should be opened in binary mode; this is ignored on Unix.
 512    Returns NULL on error.  Don't call fclose on the returned FILE; it
 513    will be closed by pex_free.  */
 514
 515 extern FILE *pex_read_output (struct pex_obj *, int binary);
 516
 517 /* Return exit status of all programs in VECTOR.  COUNT indicates the
 518    size of VECTOR.  The status codes in the vector are in the order of
 519    the calls to pex_run.  Returns 0 on error, 1 on success.  */
 520
 521 extern int pex_get_status (struct pex_obj *, int count, int *vector);
 522
 523 /* Return times of all programs in VECTOR.  COUNT indicates the size
 524    of VECTOR.  struct pex_time is really just struct timeval, but that
 525    is not portable to all systems.  Returns 0 on error, 1 on
 526    success.  */
 527
 528 struct pex_time
 529 {
 530   unsigned long user_seconds;
 531   unsigned long user_microseconds;
 532   unsigned long system_seconds;
 533   unsigned long system_microseconds;
 534 };
 535
 536 extern int pex_get_times (struct pex_obj *, int count,
 537                           struct pex_time *vector);
 538
 539 /* Clean up a pex_obj.  */
 540
 541 extern void pex_free (struct pex_obj *);
 542
 543 /* Just execute one program.  Return value is as for pex_run.
 544    FLAGS        Combination of PEX_SEARCH and PEX_STDERR_TO_STDOUT.
 545    EXECUTABLE   As for pex_run.
 546    ARGV         As for pex_run.
 547    PNAME        As for pex_init.
 548    OUTNAME      As for pex_run when PEX_LAST is set.
 549    ERRNAME      As for pex_run.
 550    STATUS       Set to exit status on success.
 551    ERR          As for pex_run.
 552 */
 553
 554 extern const char *pex_one (int flags, const char *executable,
 555                             char * const *argv, const char *pname,
 556                             const char *outname, const char *errname,
 557                             int *status, int *err);
 558
 559 /* pexecute and pwait are the old pexecute interface, still here for
 560    backward compatibility.  Don't use these for new code.  Instead,
 561    use pex_init/pex_run/pex_get_status/pex_free, or pex_one.  */
 562
 563 /* Definitions used by the pexecute routine.  */
 564
 565 #define PEXECUTE_FIRST   1
 566 #define PEXECUTE_LAST    2
 567 #define PEXECUTE_ONE     (PEXECUTE_FIRST + PEXECUTE_LAST)
 568 #define PEXECUTE_SEARCH  4
 569 #define PEXECUTE_VERBOSE 8
 570
 571 /* Execute a program.  */
 572
 573 extern int pexecute (const char *, char * const *, const char *,
 574                      const char *, char **, char **, int);
 575
 576 /* Wait for pexecute to finish.  */
 577
 578 extern int pwait (int, int *, int);
 579
 580 #if !HAVE_DECL_ASPRINTF
 581 /* Like sprintf but provides a pointer to malloc'd storage, which must
 582    be freed by the caller.  */
 583
 584 extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;
 585 #endif
 586
 587 #if !HAVE_DECL_VASPRINTF
 588 /* Like vsprintf but provides a pointer to malloc'd storage, which
 589    must be freed by the caller.  */
 590
 591 extern int vasprintf (char **, const char *, va_list) ATTRIBUTE_PRINTF(2,0);
 592 #endif
 593
 594 #if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 595 /* Like sprintf but prints at most N characters.  */
 596 extern int snprintf (char *, size_t, const char *, ...) ATTRIBUTE_PRINTF_3;
 597 #endif
 598
 599 #if defined(HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 600 /* Like vsprintf but prints at most N characters.  */
 601 extern int vsnprintf (char *, size_t, const char *, va_list) ATTRIBUTE_PRINTF(3,0);
 602 #endif
 603
 604 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 605 /* Compare version strings.  */
 606 extern int strverscmp (const char *, const char *);
 607 #endif
 608
 609 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 610
 611 /* Drastically simplified alloca configurator.  If we're using GCC,
 612    we use __builtin_alloca; otherwise we use the C alloca.  The C
 613    alloca is always available.  You can override GCC by defining
 614    USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
 615    also set/unset as it is often used to indicate whether code needs
 616    to call alloca(0).  */
 617 extern void *C_alloca (size_t) ATTRIBUTE_MALLOC;
 618 #undef alloca
 619 #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
 620 # define alloca(x) __builtin_alloca(x)
 621 # undef C_ALLOCA
 622 # define ASTRDUP(X) \
 623   (__extension__ ({ const char *const libiberty_optr = (X); \
 624    const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
 625    char *const libiberty_nptr = (char *const) alloca (libiberty_len); \
 626    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
 627 #else
 628 # define alloca(x) C_alloca(x)
 629 # undef USE_C_ALLOCA
 630 # define USE_C_ALLOCA 1
 631 # undef C_ALLOCA
 632 # define C_ALLOCA 1
 633 extern const char *libiberty_optr;
 634 extern char *libiberty_nptr;
 635 extern unsigned long libiberty_len;
 636 # define ASTRDUP(X) \
 637   (libiberty_optr = (X), \
 638    libiberty_len = strlen (libiberty_optr) + 1, \
 639    libiberty_nptr = (char *) alloca (libiberty_len), \
 640    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
 641 #endif
 642
 643 #ifdef __cplusplus
 644 }
 645 #endif
 646
 647
 648 #endif /* ! defined (LIBIBERTY_H) */