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) */ 663