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_MEMMEM
 144 #define memmem rep_memmem
 145 void *rep_memmem(const void *haystack, size_t haystacklen,
 146                  const void *needle, size_t needlelen);
 147 #endif
 148
 149 #ifndef HAVE_MKTIME
 150 #define mktime rep_mktime
 151 /* prototype is in "system/time.h" */
 152 #endif
 153
 154 #ifndef HAVE_TIMEGM
 155 #define timegm rep_timegm
 156 /* prototype is in "system/time.h" */
 157 #endif
 158
 159 #ifndef HAVE_UTIME
 160 #define utime rep_utime
 161 /* prototype is in "system/time.h" */
 162 #endif
 163
 164 #ifndef HAVE_UTIMES
 165 #define utimes rep_utimes
 166 /* prototype is in "system/time.h" */
 167 #endif
 168
 169 #ifndef HAVE_STRLCPY
 170 #define strlcpy rep_strlcpy
 171 size_t rep_strlcpy(char *d, const char *s, size_t bufsize);
 172 #endif
 173
 174 #ifndef HAVE_STRLCAT
 175 #define strlcat rep_strlcat
 176 size_t rep_strlcat(char *d, const char *s, size_t bufsize);
 177 #endif
 178
 179 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
 180 #undef HAVE_STRNDUP
 181 #define strndup rep_strndup
 182 char *rep_strndup(const char *s, size_t n);
 183 #endif
 184
 185 #if (defined(BROKEN_STRNLEN) || !defined(HAVE_STRNLEN))
 186 #undef HAVE_STRNLEN
 187 #define strnlen rep_strnlen
 188 size_t rep_strnlen(const char *s, size_t n);
 189 #endif
 190
 191 #if !HAVE_DECL_ENVIRON
 192 #ifdef __APPLE__
 193 #include <crt_externs.h>
 194 #define environ (*_NSGetEnviron())
 195 #else
 196 extern char **environ;
 197 #endif
 198 #endif
 199
 200 #ifndef HAVE_SETENV
 201 #define setenv rep_setenv
 202 int rep_setenv(const char *name, const char *value, int overwrite);
 203 #else
 204 #ifndef HAVE_SETENV_DECL
 205 int setenv(const char *name, const char *value, int overwrite);
 206 #endif
 207 #endif
 208
 209 #ifndef HAVE_UNSETENV
 210 #define unsetenv rep_unsetenv
 211 int rep_unsetenv(const char *name);
 212 #endif
 213
 214 #ifndef HAVE_SETEUID
 215 #define seteuid rep_seteuid
 216 int rep_seteuid(uid_t);
 217 #endif
 218
 219 #ifndef HAVE_SETEGID
 220 #define setegid rep_setegid
 221 int rep_setegid(gid_t);
 222 #endif
 223
 224 #if (defined(USE_SETRESUID) && !defined(HAVE_SETRESUID_DECL))
 225 /* stupid glibc */
 226 int setresuid(uid_t ruid, uid_t euid, uid_t suid);
 227 #endif
 228 #if (defined(USE_SETRESUID) && !defined(HAVE_SETRESGID_DECL))
 229 int setresgid(gid_t rgid, gid_t egid, gid_t sgid);
 230 #endif
 231
 232 #ifndef HAVE_CHOWN
 233 #define chown rep_chown
 234 int rep_chown(const char *path, uid_t uid, gid_t gid);
 235 #endif
 236
 237 #ifndef HAVE_CHROOT
 238 #define chroot rep_chroot
 239 int rep_chroot(const char *dirname);
 240 #endif
 241
 242 #ifndef HAVE_LINK
 243 #define link rep_link
 244 int rep_link(const char *oldpath, const char *newpath);
 245 #endif
 246
 247 #ifndef HAVE_READLINK
 248 #define readlink rep_readlink
 249 ssize_t rep_readlink(const char *path, char *buf, size_t bufsize);
 250 #endif
 251
 252 #ifndef HAVE_SYMLINK
 253 #define symlink rep_symlink
 254 int rep_symlink(const char *oldpath, const char *newpath);
 255 #endif
 256
 257 #ifndef HAVE_REALPATH
 258 #define realpath rep_realpath
 259 char *rep_realpath(const char *path, char *resolved_path);
 260 #endif
 261
 262 #ifndef HAVE_LCHOWN
 263 #define lchown rep_lchown
 264 int rep_lchown(const char *fname,uid_t uid,gid_t gid);
 265 #endif
 266
 267 #ifdef HAVE_UNIX_H
 268 #include <unix.h>
 269 #endif
 270
 271 #ifndef HAVE_SETLINEBUF
 272 #define setlinebuf rep_setlinebuf
 273 void rep_setlinebuf(FILE *);
 274 #endif
 275
 276 #ifndef HAVE_STRCASESTR
 277 #define strcasestr rep_strcasestr
 278 char *rep_strcasestr(const char *haystack, const char *needle);
 279 #endif
 280
 281 #ifndef HAVE_STRTOK_R
 282 #define strtok_r rep_strtok_r
 283 char *rep_strtok_r(char *s, const char *delim, char **save_ptr);
 284 #endif
 285
 286 #ifndef HAVE_STRTOLL
 287 #define strtoll rep_strtoll
 288 long long int rep_strtoll(const char *str, char **endptr, int base);
 289 #endif
 290
 291 #ifndef HAVE_STRTOULL
 292 #define strtoull rep_strtoull
 293 unsigned long long int rep_strtoull(const char *str, char **endptr, int base);
 294 #endif
 295
 296 #ifndef HAVE_FTRUNCATE
 297 #define ftruncate rep_ftruncate
 298 int rep_ftruncate(int,off_t);
 299 #endif
 300
 301 #ifndef HAVE_INITGROUPS
 302 #define initgroups rep_initgroups
 303 int rep_initgroups(char *name, gid_t id);
 304 #endif
 305
 306 #if !defined(HAVE_BZERO) && defined(HAVE_MEMSET)
 307 #define bzero(a,b) memset((a),'\0',(b))
 308 #endif
 309
 310 #ifndef HAVE_DLERROR
 311 #define dlerror rep_dlerror
 312 char *rep_dlerror(void);
 313 #endif
 314
 315 #ifndef HAVE_DLOPEN
 316 #define dlopen rep_dlopen
 317 #ifdef DLOPEN_TAKES_UNSIGNED_FLAGS
 318 void *rep_dlopen(const char *name, unsigned int flags);
 319 #else
 320 void *rep_dlopen(const char *name, int flags);
 321 #endif
 322 #endif
 323
 324 #ifndef HAVE_DLSYM
 325 #define dlsym rep_dlsym
 326 void *rep_dlsym(void *handle, const char *symbol);
 327 #endif
 328
 329 #ifndef HAVE_DLCLOSE
 330 #define dlclose rep_dlclose
 331 int rep_dlclose(void *handle);
 332 #endif
 333
 334 #ifndef HAVE_SOCKETPAIR
 335 #define socketpair rep_socketpair
 336 /* prototype is in system/network.h */
 337 #endif
 338
 339 #ifndef HAVE_VDPRINTF
 340 #define vdprintf rep_vdprintf
 341 int rep_vdprintf(int fd, const char *format, va_list ap);
 342 #endif
 343
 344 #ifndef HAVE_DPRINTF
 345 #define dprintf rep_dprintf
 346 int rep_dprintf(int fd, const char *format, ...);
 347 #endif
 348
 349 #ifndef PRINTF_ATTRIBUTE
 350 #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 )
 351 /** Use gcc attribute to check printf fns.  a1 is the 1-based index of
 352  * the parameter containing the format, and a2 the index of the first
 353  * argument. Note that some gcc 2.x versions don't handle this
 354  * properly **/
 355 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
 356 #else
 357 #define PRINTF_ATTRIBUTE(a1, a2)
 358 #endif
 359 #endif
 360
 361 #ifndef _DEPRECATED_
 362 #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 )
 363 #define _DEPRECATED_ __attribute__ ((deprecated))
 364 #else
 365 #define _DEPRECATED_
 366 #endif
 367 #endif
 368
 369 #ifndef HAVE_VASPRINTF
 370 #define vasprintf rep_vasprintf
 371 int rep_vasprintf(char **ptr, const char *format, va_list ap) PRINTF_ATTRIBUTE(2,0);
 372 #endif
 373
 374 #if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 375 #define snprintf rep_snprintf
 376 int rep_snprintf(char *,size_t ,const char *, ...) PRINTF_ATTRIBUTE(3,4);
 377 #endif
 378
 379 #if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 380 #define vsnprintf rep_vsnprintf
 381 int rep_vsnprintf(char *,size_t ,const char *, va_list ap) PRINTF_ATTRIBUTE(3,0);
 382 #endif
 383
 384 #ifndef HAVE_ASPRINTF
 385 #define asprintf rep_asprintf
 386 int rep_asprintf(char **,const char *, ...) PRINTF_ATTRIBUTE(2,3);
 387 #endif
 388
 389 #ifndef HAVE_VSYSLOG
 390 #ifdef HAVE_SYSLOG
 391 #define vsyslog rep_vsyslog
 392 void rep_vsyslog (int facility_priority, const char *format, va_list arglist) PRINTF_ATTRIBUTE(2,0);
 393 #endif
 394 #endif
 395
 396 /* we used to use these fns, but now we have good replacements
 397    for snprintf and vsnprintf */
 398 #define slprintf snprintf
 399
 400
 401 #ifndef HAVE_VA_COPY
 402 #undef va_copy
 403 #ifdef HAVE___VA_COPY
 404 #define va_copy(dest, src) __va_copy(dest, src)
 405 #else
 406 #define va_copy(dest, src) (dest) = (src)
 407 #endif
 408 #endif
 409
 410 #ifndef HAVE_VOLATILE
 411 #define volatile
 412 #endif
 413
 414 #ifndef HAVE_COMPARISON_FN_T
 415 typedef int (*comparison_fn_t)(const void *, const void *);
 416 #endif
 417
 418 #ifdef REPLACE_STRPTIME
 419 #define strptime rep_strptime
 420 struct tm;
 421 char *rep_strptime(const char *buf, const char *format, struct tm *tm);
 422 #endif
 423
 424 #ifndef HAVE_DUP2
 425 #define dup2 rep_dup2
 426 int rep_dup2(int oldfd, int newfd);
 427 #endif
 428
 429 /* Load header file for dynamic linking stuff */
 430 #ifdef HAVE_DLFCN_H
 431 #include <dlfcn.h>
 432 #endif
 433
 434 #ifndef RTLD_LAZY
 435 #define RTLD_LAZY 0
 436 #endif
 437 #ifndef RTLD_NOW
 438 #define RTLD_NOW 0
 439 #endif
 440 #ifndef RTLD_GLOBAL
 441 #define RTLD_GLOBAL 0
 442 #endif
 443
 444 #ifndef HAVE_SECURE_MKSTEMP
 445 #define mkstemp(path) rep_mkstemp(path)
 446 int rep_mkstemp(char *temp);
 447 #endif
 448
 449 #ifndef HAVE_MKDTEMP
 450 #define mkdtemp rep_mkdtemp
 451 char *rep_mkdtemp(char *template);
 452 #endif
 453
 454 #ifndef HAVE_PREAD
 455 #define pread rep_pread
 456 ssize_t rep_pread(int __fd, void *__buf, size_t __nbytes, off_t __offset);
 457 #define LIBREPLACE_PREAD_REPLACED 1
 458 #else
 459 #define LIBREPLACE_PREAD_NOT_REPLACED 1
 460 #endif
 461
 462 #ifndef HAVE_PWRITE
 463 #define pwrite rep_pwrite
 464 ssize_t rep_pwrite(int __fd, const void *__buf, size_t __nbytes, off_t __offset);
 465 #define LIBREPLACE_PWRITE_REPLACED 1
 466 #else
 467 #define LIBREPLACE_PWRITE_NOT_REPLACED 1
 468 #endif
 469
 470 #if !defined(HAVE_INET_NTOA) || defined(REPLACE_INET_NTOA)
 471 #define inet_ntoa rep_inet_ntoa
 472 /* prototype is in "system/network.h" */
 473 #endif
 474
 475 #ifndef HAVE_INET_PTON
 476 #define inet_pton rep_inet_pton
 477 /* prototype is in "system/network.h" */
 478 #endif
 479
 480 #ifndef HAVE_INET_NTOP
 481 #define inet_ntop rep_inet_ntop
 482 /* prototype is in "system/network.h" */
 483 #endif
 484
 485 #ifndef HAVE_INET_ATON
 486 #define inet_aton rep_inet_aton
 487 /* prototype is in "system/network.h" */
 488 #endif
 489
 490 #ifndef HAVE_CONNECT
 491 #define connect rep_connect
 492 /* prototype is in "system/network.h" */
 493 #endif
 494
 495 #ifndef HAVE_GETHOSTBYNAME
 496 #define gethostbyname rep_gethostbyname
 497 /* prototype is in "system/network.h" */
 498 #endif
 499
 500 #ifndef HAVE_GETIFADDRS
 501 #define getifaddrs rep_getifaddrs
 502 /* prototype is in "system/network.h" */
 503 #endif
 504
 505 #ifndef HAVE_FREEIFADDRS
 506 #define freeifaddrs rep_freeifaddrs
 507 /* prototype is in "system/network.h" */
 508 #endif
 509
 510 #ifndef HAVE_GET_CURRENT_DIR_NAME
 511 #define get_current_dir_name rep_get_current_dir_name
 512 char *rep_get_current_dir_name(void);
 513 #endif
 514
 515 #if !defined(HAVE_STRERROR_R) || !defined(STRERROR_R_PROTO_COMPATIBLE)
 516 #define strerror_r rep_strerror_r
 517 int rep_strerror_r(int errnum, char *buf, size_t buflen);
 518 #endif
 519
 520 #ifdef HAVE_LIMITS_H
 521 #include <limits.h>
 522 #endif
 523
 524 #ifdef HAVE_SYS_PARAM_H
 525 #include <sys/param.h>
 526 #endif
 527
 528 /* The extra casts work around common compiler bugs.  */
 529 #define _TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
 530 /* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
 531    It is necessary at least when t == time_t.  */
 532 #define _TYPE_MINIMUM(t) ((t) (_TYPE_SIGNED (t) \
 533                               ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
 534 #define _TYPE_MAXIMUM(t) ((t) (~ (t) 0 - _TYPE_MINIMUM (t)))
 535
 536 #ifndef UINT16_MAX
 537 #define UINT16_MAX 65535
 538 #endif
 539
 540 #ifndef UINT32_MAX
 541 #define UINT32_MAX (4294967295U)
 542 #endif
 543
 544 #ifndef UINT64_MAX
 545 #define UINT64_MAX ((uint64_t)-1)
 546 #endif
 547
 548 #ifndef CHAR_BIT
 549 #define CHAR_BIT 8
 550 #endif
 551
 552 #ifndef INT32_MAX
 553 #define INT32_MAX _TYPE_MAXIMUM(int32_t)
 554 #endif
 555
 556 #ifdef HAVE_STDBOOL_H
 557 #include <stdbool.h>
 558 #endif
 559
 560 #if !defined(HAVE_BOOL)
 561 #ifdef HAVE__Bool
 562 #define bool _Bool
 563 #else
 564 typedef int bool;
 565 #endif
 566 #endif
 567
 568 #if !defined(HAVE_INTPTR_T)
 569 typedef long long intptr_t ;
 570 #endif
 571
 572 #if !defined(HAVE_UINTPTR_T)
 573 typedef unsigned long long uintptr_t ;
 574 #endif
 575
 576 #if !defined(HAVE_PTRDIFF_T)
 577 typedef unsigned long long ptrdiff_t ;
 578 #endif
 579
 580 /*
 581  * to prevent <rpcsvc/yp_prot.h> from doing a redefine of 'bool'
 582  *
 583  * IRIX, HPUX, MacOS 10 and Solaris need BOOL_DEFINED
 584  * Tru64 needs _BOOL_EXISTS
 585  * AIX needs _BOOL,_TRUE,_FALSE
 586  */
 587 #ifndef BOOL_DEFINED
 588 #define BOOL_DEFINED
 589 #endif
 590 #ifndef _BOOL_EXISTS
 591 #define _BOOL_EXISTS
 592 #endif
 593 #ifndef _BOOL
 594 #define _BOOL
 595 #endif
 596
 597 #ifndef __bool_true_false_are_defined
 598 #define __bool_true_false_are_defined
 599 #endif
 600
 601 #ifndef true
 602 #define true (1)
 603 #endif
 604 #ifndef false
 605 #define false (0)
 606 #endif
 607
 608 #ifndef _TRUE
 609 #define _TRUE true
 610 #endif
 611 #ifndef _FALSE
 612 #define _FALSE false
 613 #endif
 614
 615 #ifndef HAVE_FUNCTION_MACRO
 616 #ifdef HAVE_func_MACRO
 617 #define __FUNCTION__ __func__
 618 #else
 619 #define __FUNCTION__ ("")
 620 #endif
 621 #endif
 622
 623
 624 #ifndef MIN
 625 #define MIN(a,b) ((a)<(b)?(a):(b))
 626 #endif
 627
 628 #ifndef MAX
 629 #define MAX(a,b) ((a)>(b)?(a):(b))
 630 #endif
 631
 632 #if !defined(HAVE_VOLATILE)
 633 #define volatile
 634 #endif
 635
 636 /**
 637   this is a warning hack. The idea is to use this everywhere that we
 638   get the "discarding const" warning from gcc. That doesn't actually
 639   fix the problem of course, but it means that when we do get to
 640   cleaning them up we can do it by searching the code for
 641   discard_const.
 642
 643   It also means that other error types aren't as swamped by the noise
 644   of hundreds of const warnings, so we are more likely to notice when
 645   we get new errors.
 646
 647   Please only add more uses of this macro when you find it
 648   _really_ hard to fix const warnings. Our aim is to eventually use
 649   this function in only a very few places.
 650
 651   Also, please call this via the discard_const_p() macro interface, as that
 652   makes the return type safe.
 653 */
 654 #define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
 655
 656 /** Type-safe version of discard_const */
 657 #define discard_const_p(type, ptr) ((type *)discard_const(ptr))
 658
 659 #ifndef __STRING
 660 #define __STRING(x)    #x
 661 #endif
 662
 663 #ifndef __STRINGSTRING
 664 #define __STRINGSTRING(x) __STRING(x)
 665 #endif
 666
 667 #ifndef __LINESTR__
 668 #define __LINESTR__ __STRINGSTRING(__LINE__)
 669 #endif
 670
 671 #ifndef __location__
 672 #define __location__ __FILE__ ":" __LINESTR__
 673 #endif
 674
 675 /**
 676  * zero a structure
 677  */
 678 #define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
 679
 680 /**
 681  * zero a structure given a pointer to the structure
 682  */
 683 #define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
 684
 685 /**
 686  * zero a structure given a pointer to the structure - no zero check
 687  */
 688 #define ZERO_STRUCTPN(x) memset((char *)(x), 0, sizeof(*(x)))
 689
 690 /* zero an array - note that sizeof(array) must work - ie. it must not be a
 691    pointer */
 692 #define ZERO_ARRAY(x) memset((char *)(x), 0, sizeof(x))
 693
 694 /**
 695  * work out how many elements there are in a static array
 696  */
 697 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
 698
 699 /**
 700  * pointer difference macro
 701  */
 702 #define PTR_DIFF(p1,p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
 703
 704 #if MMAP_BLACKLIST
 705 #undef HAVE_MMAP
 706 #endif
 707
 708 #ifdef __COMPAR_FN_T
 709 #define QSORT_CAST (__compar_fn_t)
 710 #endif
 711
 712 #ifndef QSORT_CAST
 713 #define QSORT_CAST (int (*)(const void *, const void *))
 714 #endif
 715
 716 #ifndef PATH_MAX
 717 #define PATH_MAX 1024
 718 #endif
 719
 720 #ifndef MAX_DNS_NAME_LENGTH
 721 #define MAX_DNS_NAME_LENGTH 256 /* Actually 255 but +1 for terminating null. */
 722 #endif
 723
 724 #ifndef HAVE_CRYPT
 725 char *ufc_crypt(const char *key, const char *salt);
 726 #define crypt ufc_crypt
 727 #else
 728 #ifdef HAVE_CRYPT_H
 729 #include <crypt.h>
 730 #endif
 731 #endif
 732
 733 /* these macros gain us a few percent of speed on gcc */
 734 #if (__GNUC__ >= 3)
 735 /* the strange !! is to ensure that __builtin_expect() takes either 0 or 1
 736    as its first argument */
 737 #ifndef likely
 738 #define likely(x)   __builtin_expect(!!(x), 1)
 739 #endif
 740 #ifndef unlikely
 741 #define unlikely(x) __builtin_expect(!!(x), 0)
 742 #endif
 743 #else
 744 #ifndef likely
 745 #define likely(x) (x)
 746 #endif
 747 #ifndef unlikely
 748 #define unlikely(x) (x)
 749 #endif
 750 #endif
 751
 752 #ifndef HAVE_FDATASYNC
 753 #define fdatasync(fd) fsync(fd)
 754 #endif
 755
 756 /* these are used to mark symbols as local to a shared lib, or
 757  * publicly available via the shared lib API */
 758 #ifndef _PUBLIC_
 759 #ifdef HAVE_VISIBILITY_ATTR
 760 #define _PUBLIC_ __attribute__((visibility("default")))
 761 #else
 762 #define _PUBLIC_
 763 #endif
 764 #endif
 765
 766 #ifndef _PRIVATE_
 767 #ifdef HAVE_VISIBILITY_ATTR
 768 #  define _PRIVATE_ __attribute__((visibility("hidden")))
 769 #else
 770 #  define _PRIVATE_
 771 #endif
 772 #endif
 773
 774 #endif /* _LIBREPLACE_REPLACE_H */