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, 2010, 2011 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 number of elements in argv.  */
  95
  96 extern int countargv (char**);
  97
  98 /* Return the last component of a path name.  Note that we can't use a
  99    prototype here because the parameter is declared inconsistently
 100    across different systems, sometimes as "char *" and sometimes as
 101    "const char *" */
 102
 103 /* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is
 104    undefined, we haven't run the autoconf check so provide the
 105    declaration without arguments.  If it is 0, we checked and failed
 106    to find the declaration so provide a fully prototyped one.  If it
 107    is 1, we found it so don't provide any declaration at all.  */
 108 #if !HAVE_DECL_BASENAME
 109 #if defined (__GNU_LIBRARY__ ) || defined (__linux__) || defined (__FreeBSD__) || defined (__OpenBSD__) || defined(__NetBSD__) || defined (__CYGWIN__) || defined (__CYGWIN32__) || defined (__MINGW32__) || defined (HAVE_DECL_BASENAME)
 110 extern char *basename (const char *);
 111 #else
 112 /* Do not allow basename to be used if there is no prototype seen.  We
 113    either need to use the above prototype or have one from
 114    autoconf which would result in HAVE_DECL_BASENAME being set.  */
 115 #define basename basename_cannot_be_used_without_a_prototype
 116 #endif
 117 #endif
 118
 119 /* A well-defined basename () that is always compiled in.  */
 120
 121 extern const char *lbasename (const char *);
 122
 123 /* Same, but assumes DOS semantics (drive name, backslash is also a
 124    dir separator) regardless of host.  */
 125
 126 extern const char *dos_lbasename (const char *);
 127
 128 /* Same, but assumes Unix semantics (absolute paths always start with
 129    a slash, only forward slash is accepted as dir separator)
 130    regardless of host.  */
 131
 132 extern const char *unix_lbasename (const char *);
 133
 134 /* A well-defined realpath () that is always compiled in.  */
 135
 136 extern char *lrealpath (const char *);
 137
 138 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 139    the last argument of this function, to terminate the list of
 140    strings.  Allocates memory using xmalloc.  */
 141
 142 extern char *concat (const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_SENTINEL;
 143
 144 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 145    the last argument of this function, to terminate the list of
 146    strings.  Allocates memory using xmalloc.  The first argument is
 147    not one of the strings to be concatenated, but if not NULL is a
 148    pointer to be freed after the new string is created, similar to the
 149    way xrealloc works.  */
 150
 151 extern char *reconcat (char *, const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_SENTINEL;
 152
 153 /* Determine the length of concatenating an arbitrary number of
 154    strings.  You must pass NULL as the last argument of this function,
 155    to terminate the list of strings.  */
 156
 157 extern unsigned long concat_length (const char *, ...) ATTRIBUTE_SENTINEL;
 158
 159 /* Concatenate an arbitrary number of strings into a SUPPLIED area of
 160    memory.  You must pass NULL as the last argument of this function,
 161    to terminate the list of strings.  The supplied memory is assumed
 162    to be large enough.  */
 163
 164 extern char *concat_copy (char *, const char *, ...) ATTRIBUTE_SENTINEL;
 165
 166 /* Concatenate an arbitrary number of strings into a GLOBAL area of
 167    memory.  You must pass NULL as the last argument of this function,
 168    to terminate the list of strings.  The supplied memory is assumed
 169    to be large enough.  */
 170
 171 extern char *concat_copy2 (const char *, ...) ATTRIBUTE_SENTINEL;
 172
 173 /* This is the global area used by concat_copy2.  */
 174
 175 extern char *libiberty_concat_ptr;
 176
 177 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 178    the last argument of this function, to terminate the list of
 179    strings.  Allocates memory using alloca.  The arguments are
 180    evaluated twice!  */
 181 #define ACONCAT(ACONCAT_PARAMS) \
 182   (libiberty_concat_ptr = (char *) alloca (concat_length ACONCAT_PARAMS + 1), \
 183    concat_copy2 ACONCAT_PARAMS)
 184
 185 /* Check whether two file descriptors refer to the same file.  */
 186
 187 extern int fdmatch (int fd1, int fd2);
 188
 189 /* Return the position of the first bit set in the argument.  */
 190 /* Prototypes vary from system to system, so we only provide a
 191    prototype on systems where we know that we need it.  */
 192 #if defined (HAVE_DECL_FFS) && !HAVE_DECL_FFS
 193 extern int ffs(int);
 194 #endif
 195
 196 /* Get the working directory.  The result is cached, so don't call
 197    chdir() between calls to getpwd().  */
 198
 199 extern char * getpwd (void);
 200
 201 /* Get the current time.  */
 202 /* Prototypes vary from system to system, so we only provide a
 203    prototype on systems where we know that we need it.  */
 204 #ifdef __MINGW32__
 205 /* Forward declaration to avoid #include <sys/time.h>.   */
 206 struct timeval;
 207 extern int gettimeofday (struct timeval *, void *);
 208 #endif
 209
 210 /* Get the amount of time the process has run, in microseconds.  */
 211
 212 extern long get_run_time (void);
 213
 214 /* Generate a relocated path to some installation directory.  Allocates
 215    return value using malloc.  */
 216
 217 extern char *make_relative_prefix (const char *, const char *,
 218                                    const char *) ATTRIBUTE_MALLOC;
 219
 220 /* Generate a relocated path to some installation directory without
 221    attempting to follow any soft links.  Allocates
 222    return value using malloc.  */
 223
 224 extern char *make_relative_prefix_ignore_links (const char *, const char *,
 225                                                 const char *) ATTRIBUTE_MALLOC;
 226
 227 /* Choose a temporary directory to use for scratch files.  */
 228
 229 extern char *choose_temp_base (void) ATTRIBUTE_MALLOC;
 230
 231 /* Return a temporary file name or NULL if unable to create one.  */
 232
 233 extern char *make_temp_file (const char *) ATTRIBUTE_MALLOC;
 234
 235 /* Remove a link to a file unless it is special. */
 236
 237 extern int unlink_if_ordinary (const char *);
 238
 239 /* Allocate memory filled with spaces.  Allocates using malloc.  */
 240
 241 extern const char *spaces (int count);
 242
 243 /* Return the maximum error number for which strerror will return a
 244    string.  */
 245
 246 extern int errno_max (void);
 247
 248 /* Return the name of an errno value (e.g., strerrno (EINVAL) returns
 249    "EINVAL").  */
 250
 251 extern const char *strerrno (int);
 252
 253 /* Given the name of an errno value, return the value.  */
 254
 255 extern int strtoerrno (const char *);
 256
 257 /* ANSI's strerror(), but more robust.  */
 258
 259 extern char *xstrerror (int);
 260
 261 /* Return the maximum signal number for which strsignal will return a
 262    string.  */
 263
 264 extern int signo_max (void);
 265
 266 /* Return a signal message string for a signal number
 267    (e.g., strsignal (SIGHUP) returns something like "Hangup").  */
 268 /* This is commented out as it can conflict with one in system headers.
 269    We still document its existence though.  */
 270
 271 /*extern const char *strsignal (int);*/
 272
 273 /* Return the name of a signal number (e.g., strsigno (SIGHUP) returns
 274    "SIGHUP").  */
 275
 276 extern const char *strsigno (int);
 277
 278 /* Given the name of a signal, return its number.  */
 279
 280 extern int strtosigno (const char *);
 281
 282 /* Register a function to be run by xexit.  Returns 0 on success.  */
 283
 284 extern int xatexit (void (*fn) (void));
 285
 286 /* Exit, calling all the functions registered with xatexit.  */
 287
 288 extern void xexit (int status) ATTRIBUTE_NORETURN;
 289
 290 /* Set the program name used by xmalloc.  */
 291
 292 extern void xmalloc_set_program_name (const char *);
 293
 294 /* Report an allocation failure.  */
 295 extern void xmalloc_failed (size_t) ATTRIBUTE_NORETURN;
 296
 297 /* Allocate memory without fail.  If malloc fails, this will print a
 298    message to stderr (using the name set by xmalloc_set_program_name,
 299    if any) and then call xexit.  */
 300
 301 extern void *xmalloc (size_t) ATTRIBUTE_MALLOC;
 302
 303 /* Reallocate memory without fail.  This works like xmalloc.  Note,
 304    realloc type functions are not suitable for attribute malloc since
 305    they may return the same address across multiple calls. */
 306
 307 extern void *xrealloc (void *, size_t);
 308
 309 /* Allocate memory without fail and set it to zero.  This works like
 310    xmalloc.  */
 311
 312 extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC;
 313
 314 /* Copy a string into a memory buffer without fail.  */
 315
 316 extern char *xstrdup (const char *) ATTRIBUTE_MALLOC;
 317
 318 /* Copy at most N characters from string into a buffer without fail.  */
 319
 320 extern char *xstrndup (const char *, size_t) ATTRIBUTE_MALLOC;
 321
 322 /* Copy an existing memory buffer to a new memory buffer without fail.  */
 323
 324 extern void *xmemdup (const void *, size_t, size_t) ATTRIBUTE_MALLOC;
 325
 326 /* Physical memory routines.  Return values are in BYTES.  */
 327 extern double physmem_total (void);
 328 extern double physmem_available (void);
 329
 330 /* Compute the 32-bit CRC of a block of memory.  */
 331 extern unsigned int xcrc32 (const unsigned char *, int, unsigned int);
 332
 333 /* These macros provide a K&R/C89/C++-friendly way of allocating structures
 334    with nice encapsulation.  The XDELETE*() macros are technically
 335    superfluous, but provided here for symmetry.  Using them consistently
 336    makes it easier to update client code to use different allocators such
 337    as new/delete and new[]/delete[].  */
 338
 339 /* Scalar allocators.  */
 340
 341 #define XALLOCA(T)              ((T *) alloca (sizeof (T)))
 342 #define XNEW(T)                 ((T *) xmalloc (sizeof (T)))
 343 #define XCNEW(T)                ((T *) xcalloc (1, sizeof (T)))
 344 #define XDUP(T, P)              ((T *) xmemdup ((P), sizeof (T), sizeof (T)))
 345 #define XDELETE(P)              free ((void*) (P))
 346
 347 /* Array allocators.  */
 348
 349 #define XALLOCAVEC(T, N)        ((T *) alloca (sizeof (T) * (N)))
 350 #define XNEWVEC(T, N)           ((T *) xmalloc (sizeof (T) * (N)))
 351 #define XCNEWVEC(T, N)          ((T *) xcalloc ((N), sizeof (T)))
 352 #define XDUPVEC(T, P, N)        ((T *) xmemdup ((P), sizeof (T) * (N), sizeof (T) * (N)))
 353 #define XRESIZEVEC(T, P, N)     ((T *) xrealloc ((void *) (P), sizeof (T) * (N)))
 354 #define XDELETEVEC(P)           free ((void*) (P))
 355
 356 /* Allocators for variable-sized structures and raw buffers.  */
 357
 358 #define XALLOCAVAR(T, S)        ((T *) alloca ((S)))
 359 #define XNEWVAR(T, S)           ((T *) xmalloc ((S)))
 360 #define XCNEWVAR(T, S)          ((T *) xcalloc (1, (S)))
 361 #define XDUPVAR(T, P, S1, S2)   ((T *) xmemdup ((P), (S1), (S2)))
 362 #define XRESIZEVAR(T, P, S)     ((T *) xrealloc ((P), (S)))
 363
 364 /* Type-safe obstack allocator.  */
 365
 366 #define XOBNEW(O, T)            ((T *) obstack_alloc ((O), sizeof (T)))
 367 #define XOBNEWVEC(O, T, N)      ((T *) obstack_alloc ((O), sizeof (T) * (N)))
 368 #define XOBNEWVAR(O, T, S)      ((T *) obstack_alloc ((O), (S)))
 369 #define XOBFINISH(O, T)         ((T) obstack_finish ((O)))
 370
 371 /* hex character manipulation routines */
 372
 373 #define _hex_array_size 256
 374 #define _hex_bad        99
 375 extern const unsigned char _hex_value[_hex_array_size];
 376 extern void hex_init (void);
 377 #define hex_p(c)        (hex_value (c) != _hex_bad)
 378 /* If you change this, note well: Some code relies on side effects in
 379    the argument being performed exactly once.  */
 380 #define hex_value(c)    ((unsigned int) _hex_value[(unsigned char) (c)])
 381
 382 /* Flags for pex_init.  These are bits to be or'ed together.  */
 383
 384 /* Record subprocess times, if possible.  */
 385 #define PEX_RECORD_TIMES        0x1
 386
 387 /* Use pipes for communication between processes, if possible.  */
 388 #define PEX_USE_PIPES           0x2
 389
 390 /* Save files used for communication between processes.  */
 391 #define PEX_SAVE_TEMPS          0x4
 392
 393 /* Prepare to execute one or more programs, with standard output of
 394    each program fed to standard input of the next.
 395    FLAGS        As above.
 396    PNAME        The name of the program to report in error messages.
 397    TEMPBASE     A base name to use for temporary files; may be NULL to
 398                 use a random name.
 399    Returns NULL on error.  */
 400
 401 extern struct pex_obj *pex_init (int flags, const char *pname,
 402                                  const char *tempbase);
 403
 404 /* Flags for pex_run.  These are bits to be or'ed together.  */
 405
 406 /* Last program in pipeline.  Standard output of program goes to
 407    OUTNAME, or, if OUTNAME is NULL, to standard output of caller.  Do
 408    not set this if you want to call pex_read_output.  After this is
 409    set, pex_run may no longer be called with the same struct
 410    pex_obj.  */
 411 #define PEX_LAST                0x1
 412
 413 /* Search for program in executable search path.  */
 414 #define PEX_SEARCH              0x2
 415
 416 /* OUTNAME is a suffix.  */
 417 #define PEX_SUFFIX              0x4
 418
 419 /* Send program's standard error to standard output.  */
 420 #define PEX_STDERR_TO_STDOUT    0x8
 421
 422 /* Input file should be opened in binary mode.  This flag is ignored
 423    on Unix.  */
 424 #define PEX_BINARY_INPUT        0x10
 425
 426 /* Output file should be opened in binary mode.  This flag is ignored
 427    on Unix.  For proper behaviour PEX_BINARY_INPUT and
 428    PEX_BINARY_OUTPUT have to match appropriately--i.e., a call using
 429    PEX_BINARY_OUTPUT should be followed by a call using
 430    PEX_BINARY_INPUT.  */
 431 #define PEX_BINARY_OUTPUT       0x20
 432
 433 /* Capture stderr to a pipe.  The output can be read by
 434    calling pex_read_err and reading from the returned
 435    FILE object.  This flag may be specified only for
 436    the last program in a pipeline.
 437
 438    This flag is supported only on Unix and Windows.  */
 439 #define PEX_STDERR_TO_PIPE      0x40
 440
 441 /* Capture stderr in binary mode.  This flag is ignored
 442    on Unix.  */
 443 #define PEX_BINARY_ERROR        0x80
 444
 445
 446 /* Execute one program.  Returns NULL on success.  On error returns an
 447    error string (typically just the name of a system call); the error
 448    string is statically allocated.
 449
 450    OBJ          Returned by pex_init.
 451
 452    FLAGS        As above.
 453
 454    EXECUTABLE   The program to execute.
 455
 456    ARGV         NULL terminated array of arguments to pass to the program.
 457
 458    OUTNAME      Sets the output file name as follows:
 459
 460                 PEX_SUFFIX set (OUTNAME may not be NULL):
 461                   TEMPBASE parameter to pex_init not NULL:
 462                     Output file name is the concatenation of TEMPBASE
 463                     and OUTNAME.
 464                   TEMPBASE is NULL:
 465                     Output file name is a random file name ending in
 466                     OUTNAME.
 467                 PEX_SUFFIX not set:
 468                   OUTNAME not NULL:
 469                     Output file name is OUTNAME.
 470                   OUTNAME NULL, TEMPBASE not NULL:
 471                     Output file name is randomly chosen using
 472                     TEMPBASE.
 473                   OUTNAME NULL, TEMPBASE NULL:
 474                     Output file name is randomly chosen.
 475
 476                 If PEX_LAST is not set, the output file name is the
 477                 name to use for a temporary file holding stdout, if
 478                 any (there will not be a file if PEX_USE_PIPES is set
 479                 and the system supports pipes).  If a file is used, it
 480                 will be removed when no longer needed unless
 481                 PEX_SAVE_TEMPS is set.
 482
 483                 If PEX_LAST is set, and OUTNAME is not NULL, standard
 484                 output is written to the output file name.  The file
 485                 will not be removed.  If PEX_LAST and PEX_SUFFIX are
 486                 both set, TEMPBASE may not be NULL.
 487
 488    ERRNAME      If not NULL, this is the name of a file to which
 489                 standard error is written.  If NULL, standard error of
 490                 the program is standard error of the caller.
 491
 492    ERR          On an error return, *ERR is set to an errno value, or
 493                 to 0 if there is no relevant errno.
 494 */
 495
 496 extern const char *pex_run (struct pex_obj *obj, int flags,
 497                             const char *executable, char * const *argv,
 498                             const char *outname, const char *errname,
 499                             int *err);
 500
 501 /* As for pex_run (), but takes an extra parameter to enable the
 502    environment for the child process to be specified.
 503
 504    ENV          The environment for the child process, specified as
 505                 an array of character pointers.  Each element of the
 506                 array should point to a string of the form VAR=VALUE,
 507                 with the exception of the last element which must be
 508                 a null pointer.
 509 */
 510
 511 extern const char *pex_run_in_environment (struct pex_obj *obj, int flags,
 512                                            const char *executable,
 513                                            char * const *argv,
 514                                            char * const *env,
 515                                            const char *outname,
 516                                            const char *errname, int *err);
 517
 518 /* Return a stream for a temporary file to pass to the first program
 519    in the pipeline as input.  The file name is chosen as for pex_run.
 520    pex_run closes the file automatically; don't close it yourself.  */
 521
 522 extern FILE *pex_input_file (struct pex_obj *obj, int flags,
 523                              const char *in_name);
 524
 525 /* Return a stream for a pipe connected to the standard input of the
 526    first program in the pipeline.  You must have passed
 527    `PEX_USE_PIPES' to `pex_init'.  Close the returned stream
 528    yourself.  */
 529
 530 extern FILE *pex_input_pipe (struct pex_obj *obj, int binary);
 531
 532 /* Read the standard output of the last program to be executed.
 533    pex_run can not be called after this.  BINARY should be non-zero if
 534    the file should be opened in binary mode; this is ignored on Unix.
 535    Returns NULL on error.  Don't call fclose on the returned FILE; it
 536    will be closed by pex_free.  */
 537
 538 extern FILE *pex_read_output (struct pex_obj *, int binary);
 539
 540 /* Read the standard error of the last program to be executed.
 541    pex_run can not be called after this.  BINARY should be non-zero if
 542    the file should be opened in binary mode; this is ignored on Unix.
 543    Returns NULL on error.  Don't call fclose on the returned FILE; it
 544    will be closed by pex_free.  */
 545
 546 extern FILE *pex_read_err (struct pex_obj *, int binary);
 547
 548 /* Return exit status of all programs in VECTOR.  COUNT indicates the
 549    size of VECTOR.  The status codes in the vector are in the order of
 550    the calls to pex_run.  Returns 0 on error, 1 on success.  */
 551
 552 extern int pex_get_status (struct pex_obj *, int count, int *vector);
 553
 554 /* Return times of all programs in VECTOR.  COUNT indicates the size
 555    of VECTOR.  struct pex_time is really just struct timeval, but that
 556    is not portable to all systems.  Returns 0 on error, 1 on
 557    success.  */
 558
 559 struct pex_time
 560 {
 561   unsigned long user_seconds;
 562   unsigned long user_microseconds;
 563   unsigned long system_seconds;
 564   unsigned long system_microseconds;
 565 };
 566
 567 extern int pex_get_times (struct pex_obj *, int count,
 568                           struct pex_time *vector);
 569
 570 /* Clean up a pex_obj.  If you have not called pex_get_times or
 571    pex_get_status, this will try to kill the subprocesses.  */
 572
 573 extern void pex_free (struct pex_obj *);
 574
 575 /* Just execute one program.  Return value is as for pex_run.
 576    FLAGS        Combination of PEX_SEARCH and PEX_STDERR_TO_STDOUT.
 577    EXECUTABLE   As for pex_run.
 578    ARGV         As for pex_run.
 579    PNAME        As for pex_init.
 580    OUTNAME      As for pex_run when PEX_LAST is set.
 581    ERRNAME      As for pex_run.
 582    STATUS       Set to exit status on success.
 583    ERR          As for pex_run.
 584 */
 585
 586 extern const char *pex_one (int flags, const char *executable,
 587                             char * const *argv, const char *pname,
 588                             const char *outname, const char *errname,
 589                             int *status, int *err);
 590
 591 /* pexecute and pwait are the old pexecute interface, still here for
 592    backward compatibility.  Don't use these for new code.  Instead,
 593    use pex_init/pex_run/pex_get_status/pex_free, or pex_one.  */
 594
 595 /* Definitions used by the pexecute routine.  */
 596
 597 #define PEXECUTE_FIRST   1
 598 #define PEXECUTE_LAST    2
 599 #define PEXECUTE_ONE     (PEXECUTE_FIRST + PEXECUTE_LAST)
 600 #define PEXECUTE_SEARCH  4
 601 #define PEXECUTE_VERBOSE 8
 602
 603 /* Execute a program.  */
 604
 605 extern int pexecute (const char *, char * const *, const char *,
 606                      const char *, char **, char **, int);
 607
 608 /* Wait for pexecute to finish.  */
 609
 610 extern int pwait (int, int *, int);
 611
 612 #if !HAVE_DECL_ASPRINTF
 613 /* Like sprintf but provides a pointer to malloc'd storage, which must
 614    be freed by the caller.  */
 615
 616 extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;
 617 #endif
 618
 619 #if !HAVE_DECL_VASPRINTF
 620 /* Like vsprintf but provides a pointer to malloc'd storage, which
 621    must be freed by the caller.  */
 622
 623 extern int vasprintf (char **, const char *, va_list) ATTRIBUTE_PRINTF(2,0);
 624 #endif
 625
 626 #if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 627 /* Like sprintf but prints at most N characters.  */
 628 extern int snprintf (char *, size_t, const char *, ...) ATTRIBUTE_PRINTF_3;
 629 #endif
 630
 631 #if defined(HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 632 /* Like vsprintf but prints at most N characters.  */
 633 extern int vsnprintf (char *, size_t, const char *, va_list) ATTRIBUTE_PRINTF(3,0);
 634 #endif
 635
 636 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 637 /* Compare version strings.  */
 638 extern int strverscmp (const char *, const char *);
 639 #endif
 640
 641 /* Set the title of a process */
 642 extern void setproctitle (const char *name, ...);
 643
 644 /* Increase stack limit if possible.  */
 645 extern void stack_limit_increase (unsigned long);
 646
 647 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 648
 649 /* Drastically simplified alloca configurator.  If we're using GCC,
 650    we use __builtin_alloca; otherwise we use the C alloca.  The C
 651    alloca is always available.  You can override GCC by defining
 652    USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
 653    also set/unset as it is often used to indicate whether code needs
 654    to call alloca(0).  */
 655 extern void *C_alloca (size_t) ATTRIBUTE_MALLOC;
 656 #undef alloca
 657 #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
 658 # define alloca(x) __builtin_alloca(x)
 659 # undef C_ALLOCA
 660 # define ASTRDUP(X) \
 661   (__extension__ ({ const char *const libiberty_optr = (X); \
 662    const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
 663    char *const libiberty_nptr = (char *const) alloca (libiberty_len); \
 664    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
 665 #else
 666 # define alloca(x) C_alloca(x)
 667 # undef USE_C_ALLOCA
 668 # define USE_C_ALLOCA 1
 669 # undef C_ALLOCA
 670 # define C_ALLOCA 1
 671 extern const char *libiberty_optr;
 672 extern char *libiberty_nptr;
 673 extern unsigned long libiberty_len;
 674 # define ASTRDUP(X) \
 675   (libiberty_optr = (X), \
 676    libiberty_len = strlen (libiberty_optr) + 1, \
 677    libiberty_nptr = (char *) alloca (libiberty_len), \
 678    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
 679 #endif
 680
 681 #ifdef __cplusplus
 682 }
 683 #endif
 684
 685
 686 #endif /* ! defined (LIBIBERTY_H) */