include/libiberty.h

   1 /* Function declarations for libiberty.
   2
   3    Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   4    2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   5
   6    Note - certain prototypes declared in this header file are for
   7    functions whoes implementation copyright does not belong to the
   8    FSF.  Those prototypes are present in this file for reference
   9    purposes only and their presence in this file should not construed
  10    as an indication of ownership by the FSF of the implementation of
  11    those functions in any way or form whatsoever.
  12
  13    This program is free software; you can redistribute it and/or modify
  14    it under the terms of the GNU General Public License as published by
  15    the Free Software Foundation; either version 2, or (at your option)
  16    any later version.
  17
  18    This program is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program; if not, write to the Free Software
  25    Foundation, Inc., 51 Franklin Street - Fifth Floor,
  26    Boston, MA 02110-1301, USA.
  27
  28    Written by Cygnus Support, 1994.
  29
  30    The libiberty library provides a number of functions which are
  31    missing on some operating systems.  We do not declare those here,
  32    to avoid conflicts with the system header files on operating
  33    systems that do support those functions.  In this file we only
  34    declare those functions which are specific to libiberty.  */
  35
  36 #ifndef LIBIBERTY_H
  37 #define LIBIBERTY_H
  38
  39 #ifdef __cplusplus
  40 extern "C" {
  41 #endif
  42
  43 #include "ansidecl.h"
  44
  45 /* Get a definition for size_t.  */
  46 #include <stddef.h>
  47 /* Get a definition for va_list.  */
  48 #include <stdarg.h>
  49
  50 #include <stdio.h>
  51
  52 /* If the OS supports it, ensure that the supplied stream is setup to
  53    avoid any multi-threaded locking.  Otherwise leave the FILE pointer
  54    unchanged.  If the stream is NULL do nothing.  */
  55
  56 extern void unlock_stream (FILE *);
  57
  58 /* If the OS supports it, ensure that the standard I/O streams, stdin,
  59    stdout and stderr are setup to avoid any multi-threaded locking.
  60    Otherwise do nothing.  */
  61
  62 extern void unlock_std_streams (void);
  63
  64 /* Open and return a FILE pointer.  If the OS supports it, ensure that
  65    the stream is setup to avoid any multi-threaded locking.  Otherwise
  66    return the FILE pointer unchanged.  */
  67
  68 extern FILE *fopen_unlocked (const char *, const char *);
  69 extern FILE *fdopen_unlocked (int, const char *);
  70 extern FILE *freopen_unlocked (const char *, const char *, FILE *);
  71
  72 /* Build an argument vector from a string.  Allocates memory using
  73    malloc.  Use freeargv to free the vector.  */
  74
  75 extern char **buildargv (const char *) ATTRIBUTE_MALLOC;
  76
  77 /* Free a vector returned by buildargv.  */
  78
  79 extern void freeargv (char **);
  80
  81 /* Duplicate an argument vector. Allocates memory using malloc.  Use
  82    freeargv to free the vector.  */
  83
  84 extern char **dupargv (char **) ATTRIBUTE_MALLOC;
  85
  86 /* Expand "@file" arguments in argv.  */
  87
  88 extern void expandargv PARAMS ((int *, char ***));
  89
  90 /* Write argv to an @-file, inserting necessary quoting.  */
  91
  92 extern int writeargv PARAMS ((char **, FILE *));
  93
  94 /* Return the last component of a path name.  Note that we can't use a
  95    prototype here because the parameter is declared inconsistently
  96    across different systems, sometimes as "char *" and sometimes as
  97    "const char *" */
  98
  99 /* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is
 100    undefined, we haven't run the autoconf check so provide the
 101    declaration without arguments.  If it is 0, we checked and failed
 102    to find the declaration so provide a fully prototyped one.  If it
 103    is 1, we found it so don't provide any declaration at all.  */
 104 #if !HAVE_DECL_BASENAME
 105 #if defined (__GNU_LIBRARY__ ) || defined (__linux__) || defined (__FreeBSD__) || defined (__OpenBSD__) || defined(__NetBSD__) || defined (__CYGWIN__) || defined (__CYGWIN32__) || defined (__MINGW32__) || defined (HAVE_DECL_BASENAME)
 106 extern char *basename (const char *);
 107 #else
 108 /* Do not allow basename to be used if there is no prototype seen.  We
 109    either need to use the above prototype or have one from
 110    autoconf which would result in HAVE_DECL_BASENAME being set.  */
 111 #define basename basename_cannot_be_used_without_a_prototype
 112 #endif
 113 #endif
 114
 115 /* A well-defined basename () that is always compiled in.  */
 116
 117 extern const char *lbasename (const char *);
 118
 119 /* A well-defined realpath () that is always compiled in.  */
 120
 121 extern char *lrealpath (const char *);
 122
 123 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 124    the last argument of this function, to terminate the list of
 125    strings.  Allocates memory using xmalloc.  */
 126
 127 extern char *concat (const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_SENTINEL;
 128
 129 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 130    the last argument of this function, to terminate the list of
 131    strings.  Allocates memory using xmalloc.  The first argument is
 132    not one of the strings to be concatenated, but if not NULL is a
 133    pointer to be freed after the new string is created, similar to the
 134    way xrealloc works.  */
 135
 136 extern char *reconcat (char *, const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_SENTINEL;
 137
 138 /* Determine the length of concatenating an arbitrary number of
 139    strings.  You must pass NULL as the last argument of this function,
 140    to terminate the list of strings.  */
 141
 142 extern unsigned long concat_length (const char *, ...) ATTRIBUTE_SENTINEL;
 143
 144 /* Concatenate an arbitrary number of strings into a SUPPLIED area of
 145    memory.  You must pass NULL as the last argument of this function,
 146    to terminate the list of strings.  The supplied memory is assumed
 147    to be large enough.  */
 148
 149 extern char *concat_copy (char *, const char *, ...) ATTRIBUTE_SENTINEL;
 150
 151 /* Concatenate an arbitrary number of strings into a GLOBAL area of
 152    memory.  You must pass NULL as the last argument of this function,
 153    to terminate the list of strings.  The supplied memory is assumed
 154    to be large enough.  */
 155
 156 extern char *concat_copy2 (const char *, ...) ATTRIBUTE_SENTINEL;
 157
 158 /* This is the global area used by concat_copy2.  */
 159
 160 extern char *libiberty_concat_ptr;
 161
 162 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 163    the last argument of this function, to terminate the list of
 164    strings.  Allocates memory using alloca.  The arguments are
 165    evaluated twice!  */
 166 #define ACONCAT(ACONCAT_PARAMS) \
 167   (libiberty_concat_ptr = (char *) alloca (concat_length ACONCAT_PARAMS + 1), \
 168    concat_copy2 ACONCAT_PARAMS)
 169
 170 /* Check whether two file descriptors refer to the same file.  */
 171
 172 extern int fdmatch (int fd1, int fd2);
 173
 174 /* Return the position of the first bit set in the argument.  */
 175 /* Prototypes vary from system to system, so we only provide a
 176    prototype on systems where we know that we need it.  */
 177 #if defined (HAVE_DECL_FFS) && !HAVE_DECL_FFS
 178 extern int ffs(int);
 179 #endif
 180
 181 /* Get the working directory.  The result is cached, so don't call
 182    chdir() between calls to getpwd().  */
 183
 184 extern char * getpwd (void);
 185
 186 /* Get the current time.  */
 187 /* Prototypes vary from system to system, so we only provide a
 188    prototype on systems where we know that we need it.  */
 189 #ifdef __MINGW32__
 190 /* Forward declaration to avoid #include <sys/time.h>.   */
 191 struct timeval;
 192 extern int gettimeofday (struct timeval *, void *);
 193 #endif
 194
 195 /* Get the amount of time the process has run, in microseconds.  */
 196
 197 extern long get_run_time (void);
 198
 199 /* Generate a relocated path to some installation directory.  Allocates
 200    return value using malloc.  */
 201
 202 extern char *make_relative_prefix (const char *, const char *,
 203                                    const char *) ATTRIBUTE_MALLOC;
 204
 205 /* Generate a relocated path to some installation directory without
 206    attempting to follow any soft links.  Allocates
 207    return value using malloc.  */
 208
 209 extern char *make_relative_prefix_ignore_links (const char *, const char *,
 210                                                 const char *) ATTRIBUTE_MALLOC;
 211
 212 /* Choose a temporary directory to use for scratch files.  */
 213
 214 extern char *choose_temp_base (void) ATTRIBUTE_MALLOC;
 215
 216 /* Return a temporary file name or NULL if unable to create one.  */
 217
 218 extern char *make_temp_file (const char *) ATTRIBUTE_MALLOC;
 219
 220 /* Remove a link to a file unless it is special. */
 221
 222 extern int unlink_if_ordinary (const char *);
 223
 224 /* Allocate memory filled with spaces.  Allocates using malloc.  */
 225
 226 extern const char *spaces (int count);
 227
 228 /* Return the maximum error number for which strerror will return a
 229    string.  */
 230
 231 extern int errno_max (void);
 232
 233 /* Return the name of an errno value (e.g., strerrno (EINVAL) returns
 234    "EINVAL").  */
 235
 236 extern const char *strerrno (int);
 237
 238 /* Given the name of an errno value, return the value.  */
 239
 240 extern int strtoerrno (const char *);
 241
 242 /* ANSI's strerror(), but more robust.  */
 243
 244 extern char *xstrerror (int);
 245
 246 /* Return the maximum signal number for which strsignal will return a
 247    string.  */
 248
 249 extern int signo_max (void);
 250
 251 /* Return a signal message string for a signal number
 252    (e.g., strsignal (SIGHUP) returns something like "Hangup").  */
 253 /* This is commented out as it can conflict with one in system headers.
 254    We still document its existence though.  */
 255
 256 /*extern const char *strsignal (int);*/
 257
 258 /* Return the name of a signal number (e.g., strsigno (SIGHUP) returns
 259    "SIGHUP").  */
 260
 261 extern const char *strsigno (int);
 262
 263 /* Given the name of a signal, return its number.  */
 264
 265 extern int strtosigno (const char *);
 266
 267 /* Register a function to be run by xexit.  Returns 0 on success.  */
 268
 269 extern int xatexit (void (*fn) (void));
 270
 271 /* Exit, calling all the functions registered with xatexit.  */
 272
 273 extern void xexit (int status) ATTRIBUTE_NORETURN;
 274
 275 /* Set the program name used by xmalloc.  */
 276
 277 extern void xmalloc_set_program_name (const char *);
 278
 279 /* Report an allocation failure.  */
 280 extern void xmalloc_failed (size_t) ATTRIBUTE_NORETURN;
 281
 282 /* Allocate memory without fail.  If malloc fails, this will print a
 283    message to stderr (using the name set by xmalloc_set_program_name,
 284    if any) and then call xexit.  */
 285
 286 extern void *xmalloc (size_t) ATTRIBUTE_MALLOC;
 287
 288 /* Reallocate memory without fail.  This works like xmalloc.  Note,
 289    realloc type functions are not suitable for attribute malloc since
 290    they may return the same address across multiple calls. */
 291
 292 extern void *xrealloc (void *, size_t);
 293
 294 /* Allocate memory without fail and set it to zero.  This works like
 295    xmalloc.  */
 296
 297 extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC;
 298
 299 /* Copy a string into a memory buffer without fail.  */
 300
 301 extern char *xstrdup (const char *) ATTRIBUTE_MALLOC;
 302
 303 /* Copy at most N characters from string into a buffer without fail.  */
 304
 305 extern char *xstrndup (const char *, size_t) ATTRIBUTE_MALLOC;
 306
 307 /* Copy an existing memory buffer to a new memory buffer without fail.  */
 308
 309 extern void *xmemdup (const void *, size_t, size_t) ATTRIBUTE_MALLOC;
 310
 311 /* Physical memory routines.  Return values are in BYTES.  */
 312 extern double physmem_total (void);
 313 extern double physmem_available (void);
 314
 315 /* Compute the 32-bit CRC of a block of memory.  */
 316 extern unsigned int xcrc32 (const unsigned char *, int, unsigned int);
 317
 318 /* These macros provide a K&R/C89/C++-friendly way of allocating structures
 319    with nice encapsulation.  The XDELETE*() macros are technically
 320    superfluous, but provided here for symmetry.  Using them consistently
 321    makes it easier to update client code to use different allocators such
 322    as new/delete and new[]/delete[].  */
 323
 324 /* Scalar allocators.  */
 325
 326 #define XALLOCA(T)              ((T *) alloca (sizeof (T)))
 327 #define XNEW(T)                 ((T *) xmalloc (sizeof (T)))
 328 #define XCNEW(T)                ((T *) xcalloc (1, sizeof (T)))
 329 #define XDUP(T, P)              ((T *) xmemdup ((P), sizeof (T), sizeof (T)))
 330 #define XDELETE(P)              free ((void*) (P))
 331
 332 /* Array allocators.  */
 333
 334 #define XALLOCAVEC(T, N)        ((T *) alloca (sizeof (T) * (N)))
 335 #define XNEWVEC(T, N)           ((T *) xmalloc (sizeof (T) * (N)))
 336 #define XCNEWVEC(T, N)          ((T *) xcalloc ((N), sizeof (T)))
 337 #define XDUPVEC(T, P, N)        ((T *) xmemdup ((P), sizeof (T) * (N), sizeof (T) * (N)))
 338 #define XRESIZEVEC(T, P, N)     ((T *) xrealloc ((void *) (P), sizeof (T) * (N)))
 339 #define XDELETEVEC(P)           free ((void*) (P))
 340
 341 /* Allocators for variable-sized structures and raw buffers.  */
 342
 343 #define XALLOCAVAR(T, S)        ((T *) alloca ((S)))
 344 #define XNEWVAR(T, S)           ((T *) xmalloc ((S)))
 345 #define XCNEWVAR(T, S)          ((T *) xcalloc (1, (S)))
 346 #define XDUPVAR(T, P, S1, S2)   ((T *) xmemdup ((P), (S1), (S2)))
 347 #define XRESIZEVAR(T, P, S)     ((T *) xrealloc ((P), (S)))
 348
 349 /* Type-safe obstack allocator.  */
 350
 351 #define XOBNEW(O, T)            ((T *) obstack_alloc ((O), sizeof (T)))
 352 #define XOBNEWVEC(O, T, N)      ((T *) obstack_alloc ((O), sizeof (T) * (N)))
 353 #define XOBNEWVAR(O, T, S)      ((T *) obstack_alloc ((O), (S)))
 354 #define XOBFINISH(O, T)         ((T) obstack_finish ((O)))
 355
 356 /* hex character manipulation routines */
 357
 358 #define _hex_array_size 256
 359 #define _hex_bad        99
 360 extern const unsigned char _hex_value[_hex_array_size];
 361 extern void hex_init (void);
 362 #define hex_p(c)        (hex_value (c) != _hex_bad)
 363 /* If you change this, note well: Some code relies on side effects in
 364    the argument being performed exactly once.  */
 365 #define hex_value(c)    ((unsigned int) _hex_value[(unsigned char) (c)])
 366
 367 /* Flags for pex_init.  These are bits to be or'ed together.  */
 368
 369 /* Record subprocess times, if possible.  */
 370 #define PEX_RECORD_TIMES        0x1
 371
 372 /* Use pipes for communication between processes, if possible.  */
 373 #define PEX_USE_PIPES           0x2
 374
 375 /* Save files used for communication between processes.  */
 376 #define PEX_SAVE_TEMPS          0x4
 377
 378 /* Prepare to execute one or more programs, with standard output of
 379    each program fed to standard input of the next.
 380    FLAGS        As above.
 381    PNAME        The name of the program to report in error messages.
 382    TEMPBASE     A base name to use for temporary files; may be NULL to
 383                 use a random name.
 384    Returns NULL on error.  */
 385
 386 extern struct pex_obj *pex_init (int flags, const char *pname,
 387                                  const char *tempbase);
 388
 389 /* Flags for pex_run.  These are bits to be or'ed together.  */
 390
 391 /* Last program in pipeline.  Standard output of program goes to
 392    OUTNAME, or, if OUTNAME is NULL, to standard output of caller.  Do
 393    not set this if you want to call pex_read_output.  After this is
 394    set, pex_run may no longer be called with the same struct
 395    pex_obj.  */
 396 #define PEX_LAST                0x1
 397
 398 /* Search for program in executable search path.  */
 399 #define PEX_SEARCH              0x2
 400
 401 /* OUTNAME is a suffix.  */
 402 #define PEX_SUFFIX              0x4
 403
 404 /* Send program's standard error to standard output.  */
 405 #define PEX_STDERR_TO_STDOUT    0x8
 406
 407 /* Input file should be opened in binary mode.  This flag is ignored
 408    on Unix.  */
 409 #define PEX_BINARY_INPUT        0x10
 410
 411 /* Output file should be opened in binary mode.  This flag is ignored
 412    on Unix.  For proper behaviour PEX_BINARY_INPUT and
 413    PEX_BINARY_OUTPUT have to match appropriately--i.e., a call using
 414    PEX_BINARY_OUTPUT should be followed by a call using
 415    PEX_BINARY_INPUT.  */
 416 #define PEX_BINARY_OUTPUT       0x20
 417
 418 /* Capture stderr to a pipe.  The output can be read by
 419    calling pex_read_err and reading from the returned
 420    FILE object.  This flag may be specified only for
 421    the last program in a pipeline.
 422
 423    This flag is supported only on Unix and Windows.  */
 424 #define PEX_STDERR_TO_PIPE      0x40
 425
 426 /* Capture stderr in binary mode.  This flag is ignored
 427    on Unix.  */
 428 #define PEX_BINARY_ERROR        0x80
 429
 430
 431 /* Execute one program.  Returns NULL on success.  On error returns an
 432    error string (typically just the name of a system call); the error
 433    string is statically allocated.
 434
 435    OBJ          Returned by pex_init.
 436
 437    FLAGS        As above.
 438
 439    EXECUTABLE   The program to execute.
 440
 441    ARGV         NULL terminated array of arguments to pass to the program.
 442
 443    OUTNAME      Sets the output file name as follows:
 444
 445                 PEX_SUFFIX set (OUTNAME may not be NULL):
 446                   TEMPBASE parameter to pex_init not NULL:
 447                     Output file name is the concatenation of TEMPBASE
 448                     and OUTNAME.
 449                   TEMPBASE is NULL:
 450                     Output file name is a random file name ending in
 451                     OUTNAME.
 452                 PEX_SUFFIX not set:
 453                   OUTNAME not NULL:
 454                     Output file name is OUTNAME.
 455                   OUTNAME NULL, TEMPBASE not NULL:
 456                     Output file name is randomly chosen using
 457                     TEMPBASE.
 458                   OUTNAME NULL, TEMPBASE NULL:
 459                     Output file name is randomly chosen.
 460
 461                 If PEX_LAST is not set, the output file name is the
 462                 name to use for a temporary file holding stdout, if
 463                 any (there will not be a file if PEX_USE_PIPES is set
 464                 and the system supports pipes).  If a file is used, it
 465                 will be removed when no longer needed unless
 466                 PEX_SAVE_TEMPS is set.
 467
 468                 If PEX_LAST is set, and OUTNAME is not NULL, standard
 469                 output is written to the output file name.  The file
 470                 will not be removed.  If PEX_LAST and PEX_SUFFIX are
 471                 both set, TEMPBASE may not be NULL.
 472
 473    ERRNAME      If not NULL, this is the name of a file to which
 474                 standard error is written.  If NULL, standard error of
 475                 the program is standard error of the caller.
 476
 477    ERR          On an error return, *ERR is set to an errno value, or
 478                 to 0 if there is no relevant errno.
 479 */
 480
 481 extern const char *pex_run (struct pex_obj *obj, int flags,
 482                             const char *executable, char * const *argv,
 483                             const char *outname, const char *errname,
 484                             int *err);
 485
 486 /* As for pex_run (), but takes an extra parameter to enable the
 487    environment for the child process to be specified.
 488
 489    ENV          The environment for the child process, specified as
 490                 an array of character pointers.  Each element of the
 491                 array should point to a string of the form VAR=VALUE,
 492                 with the exception of the last element which must be
 493                 a null pointer.
 494 */
 495
 496 extern const char *pex_run_in_environment (struct pex_obj *obj, int flags,
 497                                            const char *executable,
 498                                            char * const *argv,
 499                                            char * const *env,
 500                                            const char *outname,
 501                                            const char *errname, int *err);
 502
 503 /* Return a stream for a temporary file to pass to the first program
 504    in the pipeline as input.  The file name is chosen as for pex_run.
 505    pex_run closes the file automatically; don't close it yourself.  */
 506
 507 extern FILE *pex_input_file (struct pex_obj *obj, int flags,
 508                              const char *in_name);
 509
 510 /* Return a stream for a pipe connected to the standard input of the
 511    first program in the pipeline.  You must have passed
 512    `PEX_USE_PIPES' to `pex_init'.  Close the returned stream
 513    yourself.  */
 514
 515 extern FILE *pex_input_pipe (struct pex_obj *obj, int binary);
 516
 517 /* Read the standard output of the last program to be executed.
 518    pex_run can not be called after this.  BINARY should be non-zero if
 519    the file should be opened in binary mode; this is ignored on Unix.
 520    Returns NULL on error.  Don't call fclose on the returned FILE; it
 521    will be closed by pex_free.  */
 522
 523 extern FILE *pex_read_output (struct pex_obj *, int binary);
 524
 525 /* Read the standard error of the last program to be executed.
 526    pex_run can not be called after this.  BINARY should be non-zero if
 527    the file should be opened in binary mode; this is ignored on Unix.
 528    Returns NULL on error.  Don't call fclose on the returned FILE; it
 529    will be closed by pex_free.  */
 530
 531 extern FILE *pex_read_err (struct pex_obj *, int binary);
 532
 533 /* Return exit status of all programs in VECTOR.  COUNT indicates the
 534    size of VECTOR.  The status codes in the vector are in the order of
 535    the calls to pex_run.  Returns 0 on error, 1 on success.  */
 536
 537 extern int pex_get_status (struct pex_obj *, int count, int *vector);
 538
 539 /* Return times of all programs in VECTOR.  COUNT indicates the size
 540    of VECTOR.  struct pex_time is really just struct timeval, but that
 541    is not portable to all systems.  Returns 0 on error, 1 on
 542    success.  */
 543
 544 struct pex_time
 545 {
 546   unsigned long user_seconds;
 547   unsigned long user_microseconds;
 548   unsigned long system_seconds;
 549   unsigned long system_microseconds;
 550 };
 551
 552 extern int pex_get_times (struct pex_obj *, int count,
 553                           struct pex_time *vector);
 554
 555 /* Clean up a pex_obj.  If you have not called pex_get_times or
 556    pex_get_status, this will try to kill the subprocesses.  */
 557
 558 extern void pex_free (struct pex_obj *);
 559
 560 /* Just execute one program.  Return value is as for pex_run.
 561    FLAGS        Combination of PEX_SEARCH and PEX_STDERR_TO_STDOUT.
 562    EXECUTABLE   As for pex_run.
 563    ARGV         As for pex_run.
 564    PNAME        As for pex_init.
 565    OUTNAME      As for pex_run when PEX_LAST is set.
 566    ERRNAME      As for pex_run.
 567    STATUS       Set to exit status on success.
 568    ERR          As for pex_run.
 569 */
 570
 571 extern const char *pex_one (int flags, const char *executable,
 572                             char * const *argv, const char *pname,
 573                             const char *outname, const char *errname,
 574                             int *status, int *err);
 575
 576 /* pexecute and pwait are the old pexecute interface, still here for
 577    backward compatibility.  Don't use these for new code.  Instead,
 578    use pex_init/pex_run/pex_get_status/pex_free, or pex_one.  */
 579
 580 /* Definitions used by the pexecute routine.  */
 581
 582 #define PEXECUTE_FIRST   1
 583 #define PEXECUTE_LAST    2
 584 #define PEXECUTE_ONE     (PEXECUTE_FIRST + PEXECUTE_LAST)
 585 #define PEXECUTE_SEARCH  4
 586 #define PEXECUTE_VERBOSE 8
 587
 588 /* Execute a program.  */
 589
 590 extern int pexecute (const char *, char * const *, const char *,
 591                      const char *, char **, char **, int);
 592
 593 /* Wait for pexecute to finish.  */
 594
 595 extern int pwait (int, int *, int);
 596
 597 #if !HAVE_DECL_ASPRINTF
 598 /* Like sprintf but provides a pointer to malloc'd storage, which must
 599    be freed by the caller.  */
 600
 601 extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;
 602 #endif
 603
 604 #if !HAVE_DECL_VASPRINTF
 605 /* Like vsprintf but provides a pointer to malloc'd storage, which
 606    must be freed by the caller.  */
 607
 608 extern int vasprintf (char **, const char *, va_list) ATTRIBUTE_PRINTF(2,0);
 609 #endif
 610
 611 #if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 612 /* Like sprintf but prints at most N characters.  */
 613 extern int snprintf (char *, size_t, const char *, ...) ATTRIBUTE_PRINTF_3;
 614 #endif
 615
 616 #if defined(HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 617 /* Like vsprintf but prints at most N characters.  */
 618 extern int vsnprintf (char *, size_t, const char *, va_list) ATTRIBUTE_PRINTF(3,0);
 619 #endif
 620
 621 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 622 /* Compare version strings.  */
 623 extern int strverscmp (const char *, const char *);
 624 #endif
 625
 626 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 627
 628 /* Drastically simplified alloca configurator.  If we're using GCC,
 629    we use __builtin_alloca; otherwise we use the C alloca.  The C
 630    alloca is always available.  You can override GCC by defining
 631    USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
 632    also set/unset as it is often used to indicate whether code needs
 633    to call alloca(0).  */
 634 extern void *C_alloca (size_t) ATTRIBUTE_MALLOC;
 635 #undef alloca
 636 #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
 637 # define alloca(x) __builtin_alloca(x)
 638 # undef C_ALLOCA
 639 # define ASTRDUP(X) \
 640   (__extension__ ({ const char *const libiberty_optr = (X); \
 641    const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
 642    char *const libiberty_nptr = (char *const) alloca (libiberty_len); \
 643    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
 644 #else
 645 # define alloca(x) C_alloca(x)
 646 # undef USE_C_ALLOCA
 647 # define USE_C_ALLOCA 1
 648 # undef C_ALLOCA
 649 # define C_ALLOCA 1
 650 extern const char *libiberty_optr;
 651 extern char *libiberty_nptr;
 652 extern unsigned long libiberty_len;
 653 # define ASTRDUP(X) \
 654   (libiberty_optr = (X), \
 655    libiberty_len = strlen (libiberty_optr) + 1, \
 656    libiberty_nptr = (char *) alloca (libiberty_len), \
 657    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
 658 #endif
 659
 660 #ifdef __cplusplus
 661 }
 662 #endif
 663
 664
 665 #endif /* ! defined (LIBIBERTY_H) */