include/libiberty.h

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