lib/replace/replace.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    macros to go along with the lib/replace/ portability layer code
   5
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Jelmer Vernooij 2006-2008
   8    Copyright (C) Jeremy Allison 2007.
   9
  10      ** NOTE! The following LGPL license applies to the replace
  11      ** library. This does NOT imply that all of Samba is released
  12      ** under the LGPL
  13
  14    This library is free software; you can redistribute it and/or
  15    modify it under the terms of the GNU Lesser General Public
  16    License as published by the Free Software Foundation; either
  17    version 3 of the License, or (at your option) any later version.
  18
  19    This library is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22    Lesser General Public License for more details.
  23
  24    You should have received a copy of the GNU Lesser General Public
  25    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  26 */
  27
  28 #ifndef _LIBREPLACE_REPLACE_H
  29 #define _LIBREPLACE_REPLACE_H
  30
  31 #ifndef NO_CONFIG_H
  32 #include "config.h"
  33 #endif
  34
  35 #ifdef HAVE_STANDARDS_H
  36 #include <standards.h>
  37 #endif
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <stdarg.h>
  42 #include <errno.h>
  43
  44 #if defined(_MSC_VER) || defined(__MINGW32__)
  45 #include "win32_replace.h"
  46 #endif
  47
  48
  49 #ifdef HAVE_STDINT_H
  50 #include <stdint.h>
  51 /* force off HAVE_INTTYPES_H so that roken doesn't try to include both,
  52    which causes a warning storm on irix */
  53 #undef HAVE_INTTYPES_H
  54 #elif HAVE_INTTYPES_H
  55 #define __STDC_FORMAT_MACROS
  56 #include <inttypes.h>
  57 #endif
  58
  59 #ifndef __PRI64_PREFIX
  60 # if __WORDSIZE == 64
  61 #  define __PRI64_PREFIX        "l"
  62 # else
  63 #  define __PRI64_PREFIX        "ll"
  64 # endif
  65 #endif
  66
  67 /* Decimal notation.  */
  68 #ifndef PRId8
  69 # define PRId8          "d"
  70 #endif
  71 #ifndef PRId16
  72 # define PRId16         "d"
  73 #endif
  74 #ifndef PRId32
  75 # define PRId32         "d"
  76 #endif
  77 #ifndef PRId64
  78 # define PRId64         __PRI64_PREFIX "d"
  79 #endif
  80
  81 #ifndef PRIi8
  82 # define PRIi8          "i"
  83 #endif
  84 #ifndef PRIi8
  85 # define PRIi16         "i"
  86 #endif
  87 #ifndef PRIi8
  88 # define PRIi32         "i"
  89 #endif
  90 #ifndef PRIi8
  91 # define PRIi64         __PRI64_PREFIX "i"
  92 #endif
  93
  94 #ifndef PRIu8
  95 # define PRIu8          "u"
  96 #endif
  97 #ifndef PRIu16
  98 # define PRIu16         "u"
  99 #endif
 100 #ifndef PRIu32
 101 # define PRIu32         "u"
 102 #endif
 103 #ifndef PRIu64
 104 # define PRIu64         __PRI64_PREFIX "u"
 105 #endif
 106
 107 #ifdef HAVE_STRING_H
 108 #include <string.h>
 109 #endif
 110
 111 #ifdef HAVE_STRINGS_H
 112 #include <strings.h>
 113 #endif
 114
 115 #ifdef HAVE_SYS_TYPES_H
 116 #include <sys/types.h>
 117 #endif
 118
 119 #if STDC_HEADERS
 120 #include <stdlib.h>
 121 #include <stddef.h>
 122 #endif
 123
 124 #ifndef HAVE_STRERROR
 125 extern char *sys_errlist[];
 126 #define strerror(i) sys_errlist[i]
 127 #endif
 128
 129 #ifndef HAVE_ERRNO_DECL
 130 extern int errno;
 131 #endif
 132
 133 #ifndef HAVE_STRDUP
 134 #define strdup rep_strdup
 135 char *rep_strdup(const char *s);
 136 #endif
 137
 138 #ifndef HAVE_MEMMOVE
 139 #define memmove rep_memmove
 140 void *rep_memmove(void *dest,const void *src,int size);
 141 #endif
 142
 143 #ifndef HAVE_MKTIME
 144 #define mktime rep_mktime
 145 /* prototype is in "system/time.h" */
 146 #endif
 147
 148 #ifndef HAVE_TIMEGM
 149 #define timegm rep_timegm
 150 /* prototype is in "system/time.h" */
 151 #endif
 152
 153 #ifndef HAVE_UTIME
 154 #define utime rep_utime
 155 /* prototype is in "system/time.h" */
 156 #endif
 157
 158 #ifndef HAVE_UTIMES
 159 #define utimes rep_utimes
 160 /* prototype is in "system/time.h" */
 161 #endif
 162
 163 #ifndef HAVE_STRLCPY
 164 #define strlcpy rep_strlcpy
 165 size_t rep_strlcpy(char *d, const char *s, size_t bufsize);
 166 #endif
 167
 168 #ifndef HAVE_STRLCAT
 169 #define strlcat rep_strlcat
 170 size_t rep_strlcat(char *d, const char *s, size_t bufsize);
 171 #endif
 172
 173 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
 174 #undef HAVE_STRNDUP
 175 #define strndup rep_strndup
 176 char *rep_strndup(const char *s, size_t n);
 177 #endif
 178
 179 #if (defined(BROKEN_STRNLEN) || !defined(HAVE_STRNLEN))
 180 #undef HAVE_STRNLEN
 181 #define strnlen rep_strnlen
 182 size_t rep_strnlen(const char *s, size_t n);
 183 #endif
 184
 185 #if !HAVE_DECL_ENVIRON
 186 #ifdef __APPLE__
 187 #include <crt_externs.h>
 188 #define environ (*_NSGetEnviron())
 189 #else
 190 extern char **environ;
 191 #endif
 192 #endif
 193
 194 #ifndef HAVE_SETENV
 195 #define setenv rep_setenv
 196 int rep_setenv(const char *name, const char *value, int overwrite);
 197 #else
 198 #ifndef HAVE_SETENV_DECL
 199 int setenv(const char *name, const char *value, int overwrite);
 200 #endif
 201 #endif
 202
 203 #ifndef HAVE_UNSETENV
 204 #define unsetenv rep_unsetenv
 205 int rep_unsetenv(const char *name);
 206 #endif
 207
 208 #ifndef HAVE_SETEUID
 209 #define seteuid rep_seteuid
 210 int rep_seteuid(uid_t);
 211 #endif
 212
 213 #ifndef HAVE_SETEGID
 214 #define setegid rep_setegid
 215 int rep_setegid(gid_t);
 216 #endif
 217
 218 #if (defined(USE_SETRESUID) && !defined(HAVE_SETRESUID_DECL))
 219 /* stupid glibc */
 220 int setresuid(uid_t ruid, uid_t euid, uid_t suid);
 221 #endif
 222 #if (defined(USE_SETRESUID) && !defined(HAVE_SETRESGID_DECL))
 223 int setresgid(gid_t rgid, gid_t egid, gid_t sgid);
 224 #endif
 225
 226 #ifndef HAVE_CHOWN
 227 #define chown rep_chown
 228 int rep_chown(const char *path, uid_t uid, gid_t gid);
 229 #endif
 230
 231 #ifndef HAVE_CHROOT
 232 #define chroot rep_chroot
 233 int rep_chroot(const char *dirname);
 234 #endif
 235
 236 #ifndef HAVE_LINK
 237 #define link rep_link
 238 int rep_link(const char *oldpath, const char *newpath);
 239 #endif
 240
 241 #ifndef HAVE_READLINK
 242 #define readlink rep_readlink
 243 ssize_t rep_readlink(const char *path, char *buf, size_t bufsize);
 244 #endif
 245
 246 #ifndef HAVE_SYMLINK
 247 #define symlink rep_symlink
 248 int rep_symlink(const char *oldpath, const char *newpath);
 249 #endif
 250
 251 #ifndef HAVE_REALPATH
 252 #define realpath rep_realpath
 253 char *rep_realpath(const char *path, char *resolved_path);
 254 #endif
 255
 256 #ifndef HAVE_LCHOWN
 257 #define lchown rep_lchown
 258 int rep_lchown(const char *fname,uid_t uid,gid_t gid);
 259 #endif
 260
 261 #ifdef HAVE_UNIX_H
 262 #include <unix.h>
 263 #endif
 264
 265 #ifndef HAVE_SETLINEBUF
 266 #define setlinebuf rep_setlinebuf
 267 void rep_setlinebuf(FILE *);
 268 #endif
 269
 270 #ifndef HAVE_STRCASESTR
 271 #define strcasestr rep_strcasestr
 272 char *rep_strcasestr(const char *haystack, const char *needle);
 273 #endif
 274
 275 #ifndef HAVE_STRTOK_R
 276 #define strtok_r rep_strtok_r
 277 char *rep_strtok_r(char *s, const char *delim, char **save_ptr);
 278 #endif
 279
 280 #ifndef HAVE_STRTOLL
 281 #define strtoll rep_strtoll
 282 long long int rep_strtoll(const char *str, char **endptr, int base);
 283 #endif
 284
 285 #ifndef HAVE_STRTOULL
 286 #define strtoull rep_strtoull
 287 unsigned long long int rep_strtoull(const char *str, char **endptr, int base);
 288 #endif
 289
 290 #ifndef HAVE_FTRUNCATE
 291 #define ftruncate rep_ftruncate
 292 int rep_ftruncate(int,off_t);
 293 #endif
 294
 295 #ifndef HAVE_INITGROUPS
 296 #define initgroups rep_initgroups
 297 int rep_initgroups(char *name, gid_t id);
 298 #endif
 299
 300 #if !defined(HAVE_BZERO) && defined(HAVE_MEMSET)
 301 #define bzero(a,b) memset((a),'\0',(b))
 302 #endif
 303
 304 #ifndef HAVE_DLERROR
 305 #define dlerror rep_dlerror
 306 char *rep_dlerror(void);
 307 #endif
 308
 309 #ifndef HAVE_DLOPEN
 310 #define dlopen rep_dlopen
 311 #ifdef DLOPEN_TAKES_UNSIGNED_FLAGS
 312 void *rep_dlopen(const char *name, unsigned int flags);
 313 #else
 314 void *rep_dlopen(const char *name, int flags);
 315 #endif
 316 #endif
 317
 318 #ifndef HAVE_DLSYM
 319 #define dlsym rep_dlsym
 320 void *rep_dlsym(void *handle, const char *symbol);
 321 #endif
 322
 323 #ifndef HAVE_DLCLOSE
 324 #define dlclose rep_dlclose
 325 int rep_dlclose(void *handle);
 326 #endif
 327
 328 #ifndef HAVE_SOCKETPAIR
 329 #define socketpair rep_socketpair
 330 /* prototype is in system/network.h */
 331 #endif
 332
 333 #ifndef PRINTF_ATTRIBUTE
 334 #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 )
 335 /** Use gcc attribute to check printf fns.  a1 is the 1-based index of
 336  * the parameter containing the format, and a2 the index of the first
 337  * argument. Note that some gcc 2.x versions don't handle this
 338  * properly **/
 339 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
 340 #else
 341 #define PRINTF_ATTRIBUTE(a1, a2)
 342 #endif
 343 #endif
 344
 345 #ifndef _DEPRECATED_
 346 #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 )
 347 #define _DEPRECATED_ __attribute__ ((deprecated))
 348 #else
 349 #define _DEPRECATED_
 350 #endif
 351 #endif
 352
 353 #ifndef HAVE_VASPRINTF
 354 #define vasprintf rep_vasprintf
 355 int rep_vasprintf(char **ptr, const char *format, va_list ap) PRINTF_ATTRIBUTE(2,0);
 356 #endif
 357
 358 #if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 359 #define snprintf rep_snprintf
 360 int rep_snprintf(char *,size_t ,const char *, ...) PRINTF_ATTRIBUTE(3,4);
 361 #endif
 362
 363 #if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 364 #define vsnprintf rep_vsnprintf
 365 int rep_vsnprintf(char *,size_t ,const char *, va_list ap) PRINTF_ATTRIBUTE(3,0);
 366 #endif
 367
 368 #ifndef HAVE_ASPRINTF
 369 #define asprintf rep_asprintf
 370 int rep_asprintf(char **,const char *, ...) PRINTF_ATTRIBUTE(2,3);
 371 #endif
 372
 373 #ifndef HAVE_VSYSLOG
 374 #ifdef HAVE_SYSLOG
 375 #define vsyslog rep_vsyslog
 376 void rep_vsyslog (int facility_priority, const char *format, va_list arglist) PRINTF_ATTRIBUTE(2,0);
 377 #endif
 378 #endif
 379
 380 /* we used to use these fns, but now we have good replacements
 381    for snprintf and vsnprintf */
 382 #define slprintf snprintf
 383
 384
 385 #ifndef HAVE_VA_COPY
 386 #undef va_copy
 387 #ifdef HAVE___VA_COPY
 388 #define va_copy(dest, src) __va_copy(dest, src)
 389 #else
 390 #define va_copy(dest, src) (dest) = (src)
 391 #endif
 392 #endif
 393
 394 #ifndef HAVE_VOLATILE
 395 #define volatile
 396 #endif
 397
 398 #ifndef HAVE_COMPARISON_FN_T
 399 typedef int (*comparison_fn_t)(const void *, const void *);
 400 #endif
 401
 402 #ifdef REPLACE_STRPTIME
 403 #define strptime rep_strptime
 404 struct tm;
 405 char *rep_strptime(const char *buf, const char *format, struct tm *tm);
 406 #endif
 407
 408 #ifndef HAVE_DUP2
 409 #define dup2 rep_dup2
 410 int rep_dup2(int oldfd, int newfd);
 411 #endif
 412
 413 /* Load header file for dynamic linking stuff */
 414 #ifdef HAVE_DLFCN_H
 415 #include <dlfcn.h>
 416 #endif
 417
 418 #ifndef RTLD_LAZY
 419 #define RTLD_LAZY 0
 420 #endif
 421 #ifndef RTLD_NOW
 422 #define RTLD_NOW 0
 423 #endif
 424 #ifndef RTLD_GLOBAL
 425 #define RTLD_GLOBAL 0
 426 #endif
 427
 428 #ifndef HAVE_SECURE_MKSTEMP
 429 #define mkstemp(path) rep_mkstemp(path)
 430 int rep_mkstemp(char *temp);
 431 #endif
 432
 433 #ifndef HAVE_MKDTEMP
 434 #define mkdtemp rep_mkdtemp
 435 char *rep_mkdtemp(char *template);
 436 #endif
 437
 438 #ifndef HAVE_PREAD
 439 #define pread rep_pread
 440 ssize_t rep_pread(int __fd, void *__buf, size_t __nbytes, off_t __offset);
 441 #define LIBREPLACE_PREAD_REPLACED 1
 442 #else
 443 #define LIBREPLACE_PREAD_NOT_REPLACED 1
 444 #endif
 445
 446 #ifndef HAVE_PWRITE
 447 #define pwrite rep_pwrite
 448 ssize_t rep_pwrite(int __fd, const void *__buf, size_t __nbytes, off_t __offset);
 449 #define LIBREPLACE_PWRITE_REPLACED 1
 450 #else
 451 #define LIBREPLACE_PWRITE_NOT_REPLACED 1
 452 #endif
 453
 454 #if !defined(HAVE_INET_NTOA) || defined(REPLACE_INET_NTOA)
 455 #define inet_ntoa rep_inet_ntoa
 456 /* prototype is in "system/network.h" */
 457 #endif
 458
 459 #ifndef HAVE_INET_PTON
 460 #define inet_pton rep_inet_pton
 461 /* prototype is in "system/network.h" */
 462 #endif
 463
 464 #ifndef HAVE_INET_NTOP
 465 #define inet_ntop rep_inet_ntop
 466 /* prototype is in "system/network.h" */
 467 #endif
 468
 469 #ifndef HAVE_INET_ATON
 470 #define inet_aton rep_inet_aton
 471 /* prototype is in "system/network.h" */
 472 #endif
 473
 474 #ifndef HAVE_CONNECT
 475 #define connect rep_connect
 476 /* prototype is in "system/network.h" */
 477 #endif
 478
 479 #ifndef HAVE_GETHOSTBYNAME
 480 #define gethostbyname rep_gethostbyname
 481 /* prototype is in "system/network.h" */
 482 #endif
 483
 484 #ifndef HAVE_GETIFADDRS
 485 #define getifaddrs rep_getifaddrs
 486 /* prototype is in "system/network.h" */
 487 #endif
 488
 489 #ifndef HAVE_FREEIFADDRS
 490 #define freeifaddrs rep_freeifaddrs
 491 /* prototype is in "system/network.h" */
 492 #endif
 493
 494 #ifdef HAVE_LIMITS_H
 495 #include <limits.h>
 496 #endif
 497
 498 #ifdef HAVE_SYS_PARAM_H
 499 #include <sys/param.h>
 500 #endif
 501
 502 /* The extra casts work around common compiler bugs.  */
 503 #define _TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
 504 /* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
 505    It is necessary at least when t == time_t.  */
 506 #define _TYPE_MINIMUM(t) ((t) (_TYPE_SIGNED (t) \
 507                               ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
 508 #define _TYPE_MAXIMUM(t) ((t) (~ (t) 0 - _TYPE_MINIMUM (t)))
 509
 510 #ifndef UINT16_MAX
 511 #define UINT16_MAX 65535
 512 #endif
 513
 514 #ifndef UINT32_MAX
 515 #define UINT32_MAX (4294967295U)
 516 #endif
 517
 518 #ifndef UINT64_MAX
 519 #define UINT64_MAX ((uint64_t)-1)
 520 #endif
 521
 522 #ifndef CHAR_BIT
 523 #define CHAR_BIT 8
 524 #endif
 525
 526 #ifndef INT32_MAX
 527 #define INT32_MAX _TYPE_MAXIMUM(int32_t)
 528 #endif
 529
 530 #ifdef HAVE_STDBOOL_H
 531 #include <stdbool.h>
 532 #endif
 533
 534 #if !defined(HAVE_BOOL)
 535 #ifdef HAVE__Bool
 536 #define bool _Bool
 537 #else
 538 typedef int bool;
 539 #endif
 540 #endif
 541
 542 #if !defined(HAVE_INTPTR_T)
 543 typedef long long intptr_t ;
 544 #endif
 545
 546 #if !defined(HAVE_UINTPTR_T)
 547 typedef unsigned long long uintptr_t ;
 548 #endif
 549
 550 #if !defined(HAVE_PTRDIFF_T)
 551 typedef unsigned long long ptrdiff_t ;
 552 #endif
 553
 554 /*
 555  * to prevent <rpcsvc/yp_prot.h> from doing a redefine of 'bool'
 556  *
 557  * IRIX, HPUX, MacOS 10 and Solaris need BOOL_DEFINED
 558  * Tru64 needs _BOOL_EXISTS
 559  * AIX needs _BOOL,_TRUE,_FALSE
 560  */
 561 #ifndef BOOL_DEFINED
 562 #define BOOL_DEFINED
 563 #endif
 564 #ifndef _BOOL_EXISTS
 565 #define _BOOL_EXISTS
 566 #endif
 567 #ifndef _BOOL
 568 #define _BOOL
 569 #endif
 570
 571 #ifndef __bool_true_false_are_defined
 572 #define __bool_true_false_are_defined
 573 #endif
 574
 575 #ifndef true
 576 #define true (1)
 577 #endif
 578 #ifndef false
 579 #define false (0)
 580 #endif
 581
 582 #ifndef _TRUE
 583 #define _TRUE true
 584 #endif
 585 #ifndef _FALSE
 586 #define _FALSE false
 587 #endif
 588
 589 #ifndef HAVE_FUNCTION_MACRO
 590 #ifdef HAVE_func_MACRO
 591 #define __FUNCTION__ __func__
 592 #else
 593 #define __FUNCTION__ ("")
 594 #endif
 595 #endif
 596
 597
 598 #ifndef MIN
 599 #define MIN(a,b) ((a)<(b)?(a):(b))
 600 #endif
 601
 602 #ifndef MAX
 603 #define MAX(a,b) ((a)>(b)?(a):(b))
 604 #endif
 605
 606 #if !defined(HAVE_VOLATILE)
 607 #define volatile
 608 #endif
 609
 610 /**
 611   this is a warning hack. The idea is to use this everywhere that we
 612   get the "discarding const" warning from gcc. That doesn't actually
 613   fix the problem of course, but it means that when we do get to
 614   cleaning them up we can do it by searching the code for
 615   discard_const.
 616
 617   It also means that other error types aren't as swamped by the noise
 618   of hundreds of const warnings, so we are more likely to notice when
 619   we get new errors.
 620
 621   Please only add more uses of this macro when you find it
 622   _really_ hard to fix const warnings. Our aim is to eventually use
 623   this function in only a very few places.
 624
 625   Also, please call this via the discard_const_p() macro interface, as that
 626   makes the return type safe.
 627 */
 628 #define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
 629
 630 /** Type-safe version of discard_const */
 631 #define discard_const_p(type, ptr) ((type *)discard_const(ptr))
 632
 633 #ifndef __STRING
 634 #define __STRING(x)    #x
 635 #endif
 636
 637 #ifndef __STRINGSTRING
 638 #define __STRINGSTRING(x) __STRING(x)
 639 #endif
 640
 641 #ifndef __LINESTR__
 642 #define __LINESTR__ __STRINGSTRING(__LINE__)
 643 #endif
 644
 645 #ifndef __location__
 646 #define __location__ __FILE__ ":" __LINESTR__
 647 #endif
 648
 649 /**
 650  * zero a structure
 651  */
 652 #define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
 653
 654 /**
 655  * zero a structure given a pointer to the structure
 656  */
 657 #define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
 658
 659 /**
 660  * zero a structure given a pointer to the structure - no zero check
 661  */
 662 #define ZERO_STRUCTPN(x) memset((char *)(x), 0, sizeof(*(x)))
 663
 664 /* zero an array - note that sizeof(array) must work - ie. it must not be a
 665    pointer */
 666 #define ZERO_ARRAY(x) memset((char *)(x), 0, sizeof(x))
 667
 668 /**
 669  * work out how many elements there are in a static array
 670  */
 671 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
 672
 673 /**
 674  * pointer difference macro
 675  */
 676 #define PTR_DIFF(p1,p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
 677
 678 #if MMAP_BLACKLIST
 679 #undef HAVE_MMAP
 680 #endif
 681
 682 #ifdef __COMPAR_FN_T
 683 #define QSORT_CAST (__compar_fn_t)
 684 #endif
 685
 686 #ifndef QSORT_CAST
 687 #define QSORT_CAST (int (*)(const void *, const void *))
 688 #endif
 689
 690 #ifndef PATH_MAX
 691 #define PATH_MAX 1024
 692 #endif
 693
 694 #ifndef MAX_DNS_NAME_LENGTH
 695 #define MAX_DNS_NAME_LENGTH 256 /* Actually 255 but +1 for terminating null. */
 696 #endif
 697
 698 #ifndef HAVE_CRYPT
 699 char *ufc_crypt(const char *key, const char *salt);
 700 #define crypt ufc_crypt
 701 #else
 702 #ifdef HAVE_CRYPT_H
 703 #include <crypt.h>
 704 #endif
 705 #endif
 706
 707 /* these macros gain us a few percent of speed on gcc */
 708 #if (__GNUC__ >= 3)
 709 /* the strange !! is to ensure that __builtin_expect() takes either 0 or 1
 710    as its first argument */
 711 #ifndef likely
 712 #define likely(x)   __builtin_expect(!!(x), 1)
 713 #endif
 714 #ifndef unlikely
 715 #define unlikely(x) __builtin_expect(!!(x), 0)
 716 #endif
 717 #else
 718 #ifndef likely
 719 #define likely(x) (x)
 720 #endif
 721 #ifndef unlikely
 722 #define unlikely(x) (x)
 723 #endif
 724 #endif
 725
 726 #endif /* _LIBREPLACE_REPLACE_H */