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
  86 /* Return the last component of a path name.  Note that we can't use a
  87    prototype here because the parameter is declared inconsistently
  88    across different systems, sometimes as "char *" and sometimes as
  89    "const char *" */
  90
  91 /* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is
  92    undefined, we haven't run the autoconf check so provide the
  93    declaration without arguments.  If it is 0, we checked and failed
  94    to find the declaration so provide a fully prototyped one.  If it
  95    is 1, we found it so don't provide any declaration at all.  */
  96 #if !HAVE_DECL_BASENAME
  97 #if defined (__GNU_LIBRARY__ ) || defined (__linux__) || defined (__FreeBSD__) || defined (__OpenBSD__) || defined(__NetBSD__) || defined (__CYGWIN__) || defined (__CYGWIN32__) || defined (__MINGW32__) || defined (HAVE_DECL_BASENAME)
  98 extern char *basename (const char *);
  99 #else
 100 /* Do not allow basename to be used if there is no prototype seen.  We
 101    either need to use the above prototype or have one from
 102    autoconf which would result in HAVE_DECL_BASENAME being set.  */
 103 #define basename basename_cannot_be_used_without_a_prototype
 104 #endif
 105 #endif
 106
 107 /* A well-defined basename () that is always compiled in.  */
 108
 109 extern const char *lbasename (const char *);
 110
 111 /* A well-defined realpath () that is always compiled in.  */
 112
 113 extern char *lrealpath (const char *);
 114
 115 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 116    the last argument of this function, to terminate the list of
 117    strings.  Allocates memory using xmalloc.  */
 118
 119 extern char *concat (const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_SENTINEL;
 120
 121 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 122    the last argument of this function, to terminate the list of
 123    strings.  Allocates memory using xmalloc.  The first argument is
 124    not one of the strings to be concatenated, but if not NULL is a
 125    pointer to be freed after the new string is created, similar to the
 126    way xrealloc works.  */
 127
 128 extern char *reconcat (char *, const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_SENTINEL;
 129
 130 /* Determine the length of concatenating an arbitrary number of
 131    strings.  You must pass NULL as the last argument of this function,
 132    to terminate the list of strings.  */
 133
 134 extern unsigned long concat_length (const char *, ...) ATTRIBUTE_SENTINEL;
 135
 136 /* Concatenate an arbitrary number of strings into a SUPPLIED area of
 137    memory.  You must pass NULL as the last argument of this function,
 138    to terminate the list of strings.  The supplied memory is assumed
 139    to be large enough.  */
 140
 141 extern char *concat_copy (char *, const char *, ...) ATTRIBUTE_SENTINEL;
 142
 143 /* Concatenate an arbitrary number of strings into a GLOBAL 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_copy2 (const char *, ...) ATTRIBUTE_SENTINEL;
 149
 150 /* This is the global area used by concat_copy2.  */
 151
 152 extern char *libiberty_concat_ptr;
 153
 154 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 155    the last argument of this function, to terminate the list of
 156    strings.  Allocates memory using alloca.  The arguments are
 157    evaluated twice!  */
 158 #define ACONCAT(ACONCAT_PARAMS) \
 159   (libiberty_concat_ptr = (char *) alloca (concat_length ACONCAT_PARAMS + 1), \
 160    concat_copy2 ACONCAT_PARAMS)
 161
 162 /* Check whether two file descriptors refer to the same file.  */
 163
 164 extern int fdmatch (int fd1, int fd2);
 165
 166 /* Return the position of the first bit set in the argument.  */
 167 /* Prototypes vary from system to system, so we only provide a
 168    prototype on systems where we know that we need it.  */
 169 #if defined (HAVE_DECL_FFS) && !HAVE_DECL_FFS
 170 extern int ffs(int);
 171 #endif
 172
 173 /* Get the working directory.  The result is cached, so don't call
 174    chdir() between calls to getpwd().  */
 175
 176 extern char * getpwd (void);
 177
 178 /* Get the current time.  */
 179 /* Prototypes vary from system to system, so we only provide a
 180    prototype on systems where we know that we need it.  */
 181 #ifdef __MINGW32__
 182 /* Forward declaration to avoid #include <sys/time.h>.   */
 183 struct timeval;
 184 extern int gettimeofday (struct timeval *, void *);
 185 #endif
 186
 187 /* Get the amount of time the process has run, in microseconds.  */
 188
 189 extern long get_run_time (void);
 190
 191 /* Generate a relocated path to some installation directory.  Allocates
 192    return value using malloc.  */
 193
 194 extern char *make_relative_prefix (const char *, const char *,
 195                                    const char *) ATTRIBUTE_MALLOC;
 196
 197 /* Choose a temporary directory to use for scratch files.  */
 198
 199 extern char *choose_temp_base (void) ATTRIBUTE_MALLOC;
 200
 201 /* Return a temporary file name or NULL if unable to create one.  */
 202
 203 extern char *make_temp_file (const char *) ATTRIBUTE_MALLOC;
 204
 205 /* Remove a link to a file unless it is special. */
 206
 207 extern int unlink_if_ordinary (const char *);
 208
 209 /* Allocate memory filled with spaces.  Allocates using malloc.  */
 210
 211 extern const char *spaces (int count);
 212
 213 /* Return the maximum error number for which strerror will return a
 214    string.  */
 215
 216 extern int errno_max (void);
 217
 218 /* Return the name of an errno value (e.g., strerrno (EINVAL) returns
 219    "EINVAL").  */
 220
 221 extern const char *strerrno (int);
 222
 223 /* Given the name of an errno value, return the value.  */
 224
 225 extern int strtoerrno (const char *);
 226
 227 /* ANSI's strerror(), but more robust.  */
 228
 229 extern char *xstrerror (int);
 230
 231 /* Return the maximum signal number for which strsignal will return a
 232    string.  */
 233
 234 extern int signo_max (void);
 235
 236 /* Return a signal message string for a signal number
 237    (e.g., strsignal (SIGHUP) returns something like "Hangup").  */
 238 /* This is commented out as it can conflict with one in system headers.
 239    We still document its existence though.  */
 240
 241 /*extern const char *strsignal (int);*/
 242
 243 /* Return the name of a signal number (e.g., strsigno (SIGHUP) returns
 244    "SIGHUP").  */
 245
 246 extern const char *strsigno (int);
 247
 248 /* Given the name of a signal, return its number.  */
 249
 250 extern int strtosigno (const char *);
 251
 252 /* Register a function to be run by xexit.  Returns 0 on success.  */
 253
 254 extern int xatexit (void (*fn) (void));
 255
 256 /* Exit, calling all the functions registered with xatexit.  */
 257
 258 extern void xexit (int status) ATTRIBUTE_NORETURN;
 259
 260 /* Set the program name used by xmalloc.  */
 261
 262 extern void xmalloc_set_program_name (const char *);
 263
 264 /* Report an allocation failure.  */
 265 extern void xmalloc_failed (size_t) ATTRIBUTE_NORETURN;
 266
 267 /* Allocate memory without fail.  If malloc fails, this will print a
 268    message to stderr (using the name set by xmalloc_set_program_name,
 269    if any) and then call xexit.  */
 270
 271 extern void *xmalloc (size_t) ATTRIBUTE_MALLOC;
 272
 273 /* Reallocate memory without fail.  This works like xmalloc.  Note,
 274    realloc type functions are not suitable for attribute malloc since
 275    they may return the same address across multiple calls. */
 276
 277 extern void *xrealloc (void *, size_t);
 278
 279 /* Allocate memory without fail and set it to zero.  This works like
 280    xmalloc.  */
 281
 282 extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC;
 283
 284 /* Copy a string into a memory buffer without fail.  */
 285
 286 extern char *xstrdup (const char *) ATTRIBUTE_MALLOC;
 287
 288 /* Copy at most N characters from string into a buffer without fail.  */
 289
 290 extern char *xstrndup (const char *, size_t) ATTRIBUTE_MALLOC;
 291
 292 /* Copy an existing memory buffer to a new memory buffer without fail.  */
 293
 294 extern void *xmemdup (const void *, size_t, size_t) ATTRIBUTE_MALLOC;
 295
 296 /* Physical memory routines.  Return values are in BYTES.  */
 297 extern double physmem_total (void);
 298 extern double physmem_available (void);
 299
 300
 301 /* These macros provide a K&R/C89/C++-friendly way of allocating structures
 302    with nice encapsulation.  The XDELETE*() macros are technically
 303    superfluous, but provided here for symmetry.  Using them consistently
 304    makes it easier to update client code to use different allocators such
 305    as new/delete and new[]/delete[].  */
 306
 307 /* Scalar allocators.  */
 308
 309 #define XNEW(T)                 ((T *) xmalloc (sizeof (T)))
 310 #define XCNEW(T)                ((T *) xcalloc (1, sizeof (T)))
 311 #define XDELETE(P)              free ((void*) (P))
 312
 313 /* Array allocators.  */
 314
 315 #define XNEWVEC(T, N)           ((T *) xmalloc (sizeof (T) * (N)))
 316 #define XCNEWVEC(T, N)          ((T *) xcalloc ((N), sizeof (T)))
 317 #define XRESIZEVEC(T, P, N)     ((T *) xrealloc ((void *) (P), sizeof (T) * (N)))
 318 #define XDELETEVEC(P)           free ((void*) (P))
 319
 320 /* Allocators for variable-sized structures and raw buffers.  */
 321
 322 #define XNEWVAR(T, S)           ((T *) xmalloc ((S)))
 323 #define XCNEWVAR(T, S)          ((T *) xcalloc (1, (S)))
 324 #define XRESIZEVAR(T, P, S)     ((T *) xrealloc ((P), (S)))
 325
 326 /* Type-safe obstack allocator.  */
 327
 328 #define XOBNEW(O, T)            ((T *) obstack_alloc ((O), sizeof (T)))
 329 #define XOBFINISH(O, T)         ((T) obstack_finish ((O)))
 330
 331 /* hex character manipulation routines */
 332
 333 #define _hex_array_size 256
 334 #define _hex_bad        99
 335 extern const unsigned char _hex_value[_hex_array_size];
 336 extern void hex_init (void);
 337 #define hex_p(c)        (hex_value (c) != _hex_bad)
 338 /* If you change this, note well: Some code relies on side effects in
 339    the argument being performed exactly once.  */
 340 #define hex_value(c)    ((unsigned int) _hex_value[(unsigned char) (c)])
 341
 342 /* Flags for pex_init.  These are bits to be or'ed together.  */
 343
 344 /* Record subprocess times, if possible.  */
 345 #define PEX_RECORD_TIMES        0x1
 346
 347 /* Use pipes for communication between processes, if possible.  */
 348 #define PEX_USE_PIPES           0x2
 349
 350 /* Save files used for communication between processes.  */
 351 #define PEX_SAVE_TEMPS          0x4
 352
 353 /* Prepare to execute one or more programs, with standard output of
 354    each program fed to standard input of the next.
 355    FLAGS        As above.
 356    PNAME        The name of the program to report in error messages.
 357    TEMPBASE     A base name to use for temporary files; may be NULL to
 358                 use a random name.
 359    Returns NULL on error.  */
 360
 361 extern struct pex_obj *pex_init (int flags, const char *pname,
 362                                  const char *tempbase);
 363
 364 /* Flags for pex_run.  These are bits to be or'ed together.  */
 365
 366 /* Last program in pipeline.  Standard output of program goes to
 367    OUTNAME, or, if OUTNAME is NULL, to standard output of caller.  Do
 368    not set this if you want to call pex_read_output.  After this is
 369    set, pex_run may no longer be called with the same struct
 370    pex_obj.  */
 371 #define PEX_LAST                0x1
 372
 373 /* Search for program in executable search path.  */
 374 #define PEX_SEARCH              0x2
 375
 376 /* OUTNAME is a suffix.  */
 377 #define PEX_SUFFIX              0x4
 378
 379 /* Send program's standard error to standard output.  */
 380 #define PEX_STDERR_TO_STDOUT    0x8
 381
 382 /* Input file should be opened in binary mode.  This flag is ignored
 383    on Unix.  */
 384 #define PEX_BINARY_INPUT        0x10
 385
 386 /* Output file should be opened in binary mode.  This flag is ignored
 387    on Unix.  For proper behaviour PEX_BINARY_INPUT and
 388    PEX_BINARY_OUTPUT have to match appropriately--i.e., a call using
 389    PEX_BINARY_OUTPUT should be followed by a call using
 390    PEX_BINARY_INPUT.  */
 391 #define PEX_BINARY_OUTPUT       0x20
 392
 393 /* Execute one program.  Returns NULL on success.  On error returns an
 394    error string (typically just the name of a system call); the error
 395    string is statically allocated.
 396
 397    OBJ          Returned by pex_init.
 398
 399    FLAGS        As above.
 400
 401    EXECUTABLE   The program to execute.
 402
 403    ARGV         NULL terminated array of arguments to pass to the program.
 404
 405    OUTNAME      Sets the output file name as follows:
 406
 407                 PEX_SUFFIX set (OUTNAME may not be NULL):
 408                   TEMPBASE parameter to pex_init not NULL:
 409                     Output file name is the concatenation of TEMPBASE
 410                     and OUTNAME.
 411                   TEMPBASE is NULL:
 412                     Output file name is a random file name ending in
 413                     OUTNAME.
 414                 PEX_SUFFIX not set:
 415                   OUTNAME not NULL:
 416                     Output file name is OUTNAME.
 417                   OUTNAME NULL, TEMPBASE not NULL:
 418                     Output file name is randomly chosen using
 419                     TEMPBASE.
 420                   OUTNAME NULL, TEMPBASE NULL:
 421                     Output file name is randomly chosen.
 422
 423                 If PEX_LAST is not set, the output file name is the
 424                 name to use for a temporary file holding stdout, if
 425                 any (there will not be a file if PEX_USE_PIPES is set
 426                 and the system supports pipes).  If a file is used, it
 427                 will be removed when no longer needed unless
 428                 PEX_SAVE_TEMPS is set.
 429
 430                 If PEX_LAST is set, and OUTNAME is not NULL, standard
 431                 output is written to the output file name.  The file
 432                 will not be removed.  If PEX_LAST and PEX_SUFFIX are
 433                 both set, TEMPBASE may not be NULL.
 434
 435    ERRNAME      If not NULL, this is the name of a file to which
 436                 standard error is written.  If NULL, standard error of
 437                 the program is standard error of the caller.
 438
 439    ERR          On an error return, *ERR is set to an errno value, or
 440                 to 0 if there is no relevant errno.
 441 */
 442
 443 extern const char *pex_run (struct pex_obj *obj, int flags,
 444                             const char *executable, char * const *argv,
 445                             const char *outname, const char *errname,
 446                             int *err);
 447
 448 /* Read the standard output of the last program to be executed.
 449    pex_run can not be called after this.  BINARY should be non-zero if
 450    the file should be opened in binary mode; this is ignored on Unix.
 451    Returns NULL on error.  Don't call fclose on the returned FILE; it
 452    will be closed by pex_free.  */
 453
 454 extern FILE *pex_read_output (struct pex_obj *, int binary);
 455
 456 /* Return exit status of all programs in VECTOR.  COUNT indicates the
 457    size of VECTOR.  The status codes in the vector are in the order of
 458    the calls to pex_run.  Returns 0 on error, 1 on success.  */
 459
 460 extern int pex_get_status (struct pex_obj *, int count, int *vector);
 461
 462 /* Return times of all programs in VECTOR.  COUNT indicates the size
 463    of VECTOR.  struct pex_time is really just struct timeval, but that
 464    is not portable to all systems.  Returns 0 on error, 1 on
 465    success.  */
 466
 467 struct pex_time
 468 {
 469   unsigned long user_seconds;
 470   unsigned long user_microseconds;
 471   unsigned long system_seconds;
 472   unsigned long system_microseconds;
 473 };
 474
 475 extern int pex_get_times (struct pex_obj *, int count,
 476                           struct pex_time *vector);
 477
 478 /* Clean up a pex_obj.  */
 479
 480 extern void pex_free (struct pex_obj *);
 481
 482 /* Just execute one program.  Return value is as for pex_run.
 483    FLAGS        Combination of PEX_SEARCH and PEX_STDERR_TO_STDOUT.
 484    EXECUTABLE   As for pex_run.
 485    ARGV         As for pex_run.
 486    PNAME        As for pex_init.
 487    OUTNAME      As for pex_run when PEX_LAST is set.
 488    ERRNAME      As for pex_run.
 489    STATUS       Set to exit status on success.
 490    ERR          As for pex_run.
 491 */
 492
 493 extern const char *pex_one (int flags, const char *executable,
 494                             char * const *argv, const char *pname,
 495                             const char *outname, const char *errname,
 496                             int *status, int *err);
 497
 498 /* pexecute and pwait are the old pexecute interface, still here for
 499    backward compatibility.  Don't use these for new code.  Instead,
 500    use pex_init/pex_run/pex_get_status/pex_free, or pex_one.  */
 501
 502 /* Definitions used by the pexecute routine.  */
 503
 504 #define PEXECUTE_FIRST   1
 505 #define PEXECUTE_LAST    2
 506 #define PEXECUTE_ONE     (PEXECUTE_FIRST + PEXECUTE_LAST)
 507 #define PEXECUTE_SEARCH  4
 508 #define PEXECUTE_VERBOSE 8
 509
 510 /* Execute a program.  */
 511
 512 extern int pexecute (const char *, char * const *, const char *,
 513                      const char *, char **, char **, int);
 514
 515 /* Wait for pexecute to finish.  */
 516
 517 extern int pwait (int, int *, int);
 518
 519 #if !HAVE_DECL_ASPRINTF
 520 /* Like sprintf but provides a pointer to malloc'd storage, which must
 521    be freed by the caller.  */
 522
 523 extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;
 524 #endif
 525
 526 #if !HAVE_DECL_VASPRINTF
 527 /* Like vsprintf but provides a pointer to malloc'd storage, which
 528    must be freed by the caller.  */
 529
 530 extern int vasprintf (char **, const char *, va_list) ATTRIBUTE_PRINTF(2,0);
 531 #endif
 532
 533 #if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 534 /* Like sprintf but prints at most N characters.  */
 535 extern int snprintf (char *, size_t, const char *, ...) ATTRIBUTE_PRINTF_3;
 536 #endif
 537
 538 #if defined(HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 539 /* Like vsprintf but prints at most N characters.  */
 540 extern int vsnprintf (char *, size_t, const char *, va_list) ATTRIBUTE_PRINTF(3,0);
 541 #endif
 542
 543 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 544 /* Compare version strings.  */
 545 extern int strverscmp (const char *, const char *);
 546 #endif
 547
 548 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 549
 550 /* Drastically simplified alloca configurator.  If we're using GCC,
 551    we use __builtin_alloca; otherwise we use the C alloca.  The C
 552    alloca is always available.  You can override GCC by defining
 553    USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
 554    also set/unset as it is often used to indicate whether code needs
 555    to call alloca(0).  */
 556 extern void *C_alloca (size_t) ATTRIBUTE_MALLOC;
 557 #undef alloca
 558 #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
 559 # define alloca(x) __builtin_alloca(x)
 560 # undef C_ALLOCA
 561 # define ASTRDUP(X) \
 562   (__extension__ ({ const char *const libiberty_optr = (X); \
 563    const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
 564    char *const libiberty_nptr = (char *const) alloca (libiberty_len); \
 565    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
 566 #else
 567 # define alloca(x) C_alloca(x)
 568 # undef USE_C_ALLOCA
 569 # define USE_C_ALLOCA 1
 570 # undef C_ALLOCA
 571 # define C_ALLOCA 1
 572 extern const char *libiberty_optr;
 573 extern char *libiberty_nptr;
 574 extern unsigned long libiberty_len;
 575 # define ASTRDUP(X) \
 576   (libiberty_optr = (X), \
 577    libiberty_len = strlen (libiberty_optr) + 1, \
 578    libiberty_nptr = (char *) alloca (libiberty_len), \
 579    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
 580 #endif
 581
 582 #ifdef __cplusplus
 583 }
 584 #endif
 585
 586
 587 #endif /* ! defined (LIBIBERTY_H) */