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 PRIi16
  85 # define PRIi16         "i"
  86 #endif
  87 #ifndef PRIi32
  88 # define PRIi32         "i"
  89 #endif
  90 #ifndef PRIi64
  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
 287
 288 #ifndef HAVE_STRTOLL
 289 #define strtoll rep_strtoll
 290 long long int rep_strtoll(const char *str, char **endptr, int base);
 291 #else
 292 #ifdef HAVE_BSD_STRTOLL
 293 #define strtoll rep_strtoll
 294 long long int rep_strtoll(const char *str, char **endptr, int base);
 295 #endif
 296 #endif
 297
 298 #ifndef HAVE_STRTOULL
 299 #define strtoull rep_strtoull
 300 unsigned long long int rep_strtoull(const char *str, char **endptr, int base);
 301 #else
 302 #ifdef HAVE_BSD_STRTOLL /* yes, it's not HAVE_BSD_STRTOULL */
 303 #define strtoull rep_strtoull
 304 unsigned long long int rep_strtoull(const char *str, char **endptr, int base);
 305 #endif
 306 #endif
 307
 308 #ifndef HAVE_FTRUNCATE
 309 #define ftruncate rep_ftruncate
 310 int rep_ftruncate(int,off_t);
 311 #endif
 312
 313 #ifndef HAVE_INITGROUPS
 314 #define initgroups rep_initgroups
 315 int rep_initgroups(char *name, gid_t id);
 316 #endif
 317
 318 #if !defined(HAVE_BZERO) && defined(HAVE_MEMSET)
 319 #define bzero(a,b) memset((a),'\0',(b))
 320 #endif
 321
 322 #ifndef HAVE_DLERROR
 323 #define dlerror rep_dlerror
 324 char *rep_dlerror(void);
 325 #endif
 326
 327 #ifndef HAVE_DLOPEN
 328 #define dlopen rep_dlopen
 329 #ifdef DLOPEN_TAKES_UNSIGNED_FLAGS
 330 void *rep_dlopen(const char *name, unsigned int flags);
 331 #else
 332 void *rep_dlopen(const char *name, int flags);
 333 #endif
 334 #endif
 335
 336 #ifndef HAVE_DLSYM
 337 #define dlsym rep_dlsym
 338 void *rep_dlsym(void *handle, const char *symbol);
 339 #endif
 340
 341 #ifndef HAVE_DLCLOSE
 342 #define dlclose rep_dlclose
 343 int rep_dlclose(void *handle);
 344 #endif
 345
 346 #ifndef HAVE_SOCKETPAIR
 347 #define socketpair rep_socketpair
 348 /* prototype is in system/network.h */
 349 #endif
 350
 351 #ifndef HAVE_VDPRINTF
 352 #define vdprintf rep_vdprintf
 353 int rep_vdprintf(int fd, const char *format, va_list ap);
 354 #endif
 355
 356 #ifndef HAVE_DPRINTF
 357 #define dprintf rep_dprintf
 358 int rep_dprintf(int fd, const char *format, ...);
 359 #endif
 360
 361 #ifndef PRINTF_ATTRIBUTE
 362 #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 )
 363 /** Use gcc attribute to check printf fns.  a1 is the 1-based index of
 364  * the parameter containing the format, and a2 the index of the first
 365  * argument. Note that some gcc 2.x versions don't handle this
 366  * properly **/
 367 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
 368 #else
 369 #define PRINTF_ATTRIBUTE(a1, a2)
 370 #endif
 371 #endif
 372
 373 #ifndef _DEPRECATED_
 374 #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 )
 375 #define _DEPRECATED_ __attribute__ ((deprecated))
 376 #else
 377 #define _DEPRECATED_
 378 #endif
 379 #endif
 380
 381 #ifndef HAVE_VASPRINTF
 382 #define vasprintf rep_vasprintf
 383 int rep_vasprintf(char **ptr, const char *format, va_list ap) PRINTF_ATTRIBUTE(2,0);
 384 #endif
 385
 386 #if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 387 #define snprintf rep_snprintf
 388 int rep_snprintf(char *,size_t ,const char *, ...) PRINTF_ATTRIBUTE(3,4);
 389 #endif
 390
 391 #if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 392 #define vsnprintf rep_vsnprintf
 393 int rep_vsnprintf(char *,size_t ,const char *, va_list ap) PRINTF_ATTRIBUTE(3,0);
 394 #endif
 395
 396 #ifndef HAVE_ASPRINTF
 397 #define asprintf rep_asprintf
 398 int rep_asprintf(char **,const char *, ...) PRINTF_ATTRIBUTE(2,3);
 399 #endif
 400
 401 #ifndef HAVE_VSYSLOG
 402 #ifdef HAVE_SYSLOG
 403 #define vsyslog rep_vsyslog
 404 void rep_vsyslog (int facility_priority, const char *format, va_list arglist) PRINTF_ATTRIBUTE(2,0);
 405 #endif
 406 #endif
 407
 408 /* we used to use these fns, but now we have good replacements
 409    for snprintf and vsnprintf */
 410 #define slprintf snprintf
 411
 412
 413 #ifndef HAVE_VA_COPY
 414 #undef va_copy
 415 #ifdef HAVE___VA_COPY
 416 #define va_copy(dest, src) __va_copy(dest, src)
 417 #else
 418 #define va_copy(dest, src) (dest) = (src)
 419 #endif
 420 #endif
 421
 422 #ifndef HAVE_VOLATILE
 423 #define volatile
 424 #endif
 425
 426 #ifndef HAVE_COMPARISON_FN_T
 427 typedef int (*comparison_fn_t)(const void *, const void *);
 428 #endif
 429
 430 #ifdef REPLACE_STRPTIME
 431 #define strptime rep_strptime
 432 struct tm;
 433 char *rep_strptime(const char *buf, const char *format, struct tm *tm);
 434 #endif
 435
 436 #ifndef HAVE_DUP2
 437 #define dup2 rep_dup2
 438 int rep_dup2(int oldfd, int newfd);
 439 #endif
 440
 441 /* Load header file for dynamic linking stuff */
 442 #ifdef HAVE_DLFCN_H
 443 #include <dlfcn.h>
 444 #endif
 445
 446 #ifndef RTLD_LAZY
 447 #define RTLD_LAZY 0
 448 #endif
 449 #ifndef RTLD_NOW
 450 #define RTLD_NOW 0
 451 #endif
 452 #ifndef RTLD_GLOBAL
 453 #define RTLD_GLOBAL 0
 454 #endif
 455
 456 #ifndef HAVE_SECURE_MKSTEMP
 457 #define mkstemp(path) rep_mkstemp(path)
 458 int rep_mkstemp(char *temp);
 459 #endif
 460
 461 #ifndef HAVE_MKDTEMP
 462 #define mkdtemp rep_mkdtemp
 463 char *rep_mkdtemp(char *template);
 464 #endif
 465
 466 #ifndef HAVE_PREAD
 467 #define pread rep_pread
 468 ssize_t rep_pread(int __fd, void *__buf, size_t __nbytes, off_t __offset);
 469 #define LIBREPLACE_PREAD_REPLACED 1
 470 #else
 471 #define LIBREPLACE_PREAD_NOT_REPLACED 1
 472 #endif
 473
 474 #ifndef HAVE_PWRITE
 475 #define pwrite rep_pwrite
 476 ssize_t rep_pwrite(int __fd, const void *__buf, size_t __nbytes, off_t __offset);
 477 #define LIBREPLACE_PWRITE_REPLACED 1
 478 #else
 479 #define LIBREPLACE_PWRITE_NOT_REPLACED 1
 480 #endif
 481
 482 #if !defined(HAVE_INET_NTOA) || defined(REPLACE_INET_NTOA)
 483 #define inet_ntoa rep_inet_ntoa
 484 /* prototype is in "system/network.h" */
 485 #endif
 486
 487 #ifndef HAVE_INET_PTON
 488 #define inet_pton rep_inet_pton
 489 /* prototype is in "system/network.h" */
 490 #endif
 491
 492 #ifndef HAVE_INET_NTOP
 493 #define inet_ntop rep_inet_ntop
 494 /* prototype is in "system/network.h" */
 495 #endif
 496
 497 #ifndef HAVE_INET_ATON
 498 #define inet_aton rep_inet_aton
 499 /* prototype is in "system/network.h" */
 500 #endif
 501
 502 #ifndef HAVE_CONNECT
 503 #define connect rep_connect
 504 /* prototype is in "system/network.h" */
 505 #endif
 506
 507 #ifndef HAVE_GETHOSTBYNAME
 508 #define gethostbyname rep_gethostbyname
 509 /* prototype is in "system/network.h" */
 510 #endif
 511
 512 #ifndef HAVE_GETIFADDRS
 513 #define getifaddrs rep_getifaddrs
 514 /* prototype is in "system/network.h" */
 515 #endif
 516
 517 #ifndef HAVE_FREEIFADDRS
 518 #define freeifaddrs rep_freeifaddrs
 519 /* prototype is in "system/network.h" */
 520 #endif
 521
 522 #ifndef HAVE_GET_CURRENT_DIR_NAME
 523 #define get_current_dir_name rep_get_current_dir_name
 524 char *rep_get_current_dir_name(void);
 525 #endif
 526
 527 #if !defined(HAVE_STRERROR_R) || !defined(STRERROR_R_PROTO_COMPATIBLE)
 528 #undef strerror_r
 529 #define strerror_r rep_strerror_r
 530 int rep_strerror_r(int errnum, char *buf, size_t buflen);
 531 #endif
 532
 533 #if !defined(HAVE_CLOCK_GETTIME)
 534 #define clock_gettime rep_clock_gettime
 535 #endif
 536
 537 #ifdef HAVE_LIMITS_H
 538 #include <limits.h>
 539 #endif
 540
 541 #ifdef HAVE_SYS_PARAM_H
 542 #include <sys/param.h>
 543 #endif
 544
 545 /* The extra casts work around common compiler bugs.  */
 546 #define _TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
 547 /* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
 548    It is necessary at least when t == time_t.  */
 549 #define _TYPE_MINIMUM(t) ((t) (_TYPE_SIGNED (t) \
 550                               ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
 551 #define _TYPE_MAXIMUM(t) ((t) (~ (t) 0 - _TYPE_MINIMUM (t)))
 552
 553 #ifndef UINT16_MAX
 554 #define UINT16_MAX 65535
 555 #endif
 556
 557 #ifndef UINT32_MAX
 558 #define UINT32_MAX (4294967295U)
 559 #endif
 560
 561 #ifndef UINT64_MAX
 562 #define UINT64_MAX ((uint64_t)-1)
 563 #endif
 564
 565 #ifndef CHAR_BIT
 566 #define CHAR_BIT 8
 567 #endif
 568
 569 #ifndef INT32_MAX
 570 #define INT32_MAX _TYPE_MAXIMUM(int32_t)
 571 #endif
 572
 573 #ifdef HAVE_STDBOOL_H
 574 #include <stdbool.h>
 575 #endif
 576
 577 #if !defined(HAVE_BOOL)
 578 #ifdef HAVE__Bool
 579 #define bool _Bool
 580 #else
 581 typedef int bool;
 582 #endif
 583 #endif
 584
 585 #if !defined(HAVE_INTPTR_T)
 586 typedef long long intptr_t ;
 587 #endif
 588
 589 #if !defined(HAVE_UINTPTR_T)
 590 typedef unsigned long long uintptr_t ;
 591 #endif
 592
 593 #if !defined(HAVE_PTRDIFF_T)
 594 typedef unsigned long long ptrdiff_t ;
 595 #endif
 596
 597 /*
 598  * to prevent <rpcsvc/yp_prot.h> from doing a redefine of 'bool'
 599  *
 600  * IRIX, HPUX, MacOS 10 and Solaris need BOOL_DEFINED
 601  * Tru64 needs _BOOL_EXISTS
 602  * AIX needs _BOOL,_TRUE,_FALSE
 603  */
 604 #ifndef BOOL_DEFINED
 605 #define BOOL_DEFINED
 606 #endif
 607 #ifndef _BOOL_EXISTS
 608 #define _BOOL_EXISTS
 609 #endif
 610 #ifndef _BOOL
 611 #define _BOOL
 612 #endif
 613
 614 #ifndef __bool_true_false_are_defined
 615 #define __bool_true_false_are_defined
 616 #endif
 617
 618 #ifndef true
 619 #define true (1)
 620 #endif
 621 #ifndef false
 622 #define false (0)
 623 #endif
 624
 625 #ifndef _TRUE
 626 #define _TRUE true
 627 #endif
 628 #ifndef _FALSE
 629 #define _FALSE false
 630 #endif
 631
 632 #ifndef HAVE_FUNCTION_MACRO
 633 #ifdef HAVE_func_MACRO
 634 #define __FUNCTION__ __func__
 635 #else
 636 #define __FUNCTION__ ("")
 637 #endif
 638 #endif
 639
 640
 641 #ifndef MIN
 642 #define MIN(a,b) ((a)<(b)?(a):(b))
 643 #endif
 644
 645 #ifndef MAX
 646 #define MAX(a,b) ((a)>(b)?(a):(b))
 647 #endif
 648
 649 #if !defined(HAVE_VOLATILE)
 650 #define volatile
 651 #endif
 652
 653 /**
 654   this is a warning hack. The idea is to use this everywhere that we
 655   get the "discarding const" warning from gcc. That doesn't actually
 656   fix the problem of course, but it means that when we do get to
 657   cleaning them up we can do it by searching the code for
 658   discard_const.
 659
 660   It also means that other error types aren't as swamped by the noise
 661   of hundreds of const warnings, so we are more likely to notice when
 662   we get new errors.
 663
 664   Please only add more uses of this macro when you find it
 665   _really_ hard to fix const warnings. Our aim is to eventually use
 666   this function in only a very few places.
 667
 668   Also, please call this via the discard_const_p() macro interface, as that
 669   makes the return type safe.
 670 */
 671 #define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
 672
 673 /** Type-safe version of discard_const */
 674 #define discard_const_p(type, ptr) ((type *)discard_const(ptr))
 675
 676 #ifndef __STRING
 677 #define __STRING(x)    #x
 678 #endif
 679
 680 #ifndef __STRINGSTRING
 681 #define __STRINGSTRING(x) __STRING(x)
 682 #endif
 683
 684 #ifndef __LINESTR__
 685 #define __LINESTR__ __STRINGSTRING(__LINE__)
 686 #endif
 687
 688 #ifndef __location__
 689 #define __location__ __FILE__ ":" __LINESTR__
 690 #endif
 691
 692 /**
 693  * zero a structure
 694  */
 695 #define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
 696
 697 /**
 698  * zero a structure given a pointer to the structure
 699  */
 700 #define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
 701
 702 /**
 703  * zero a structure given a pointer to the structure - no zero check
 704  */
 705 #define ZERO_STRUCTPN(x) memset((char *)(x), 0, sizeof(*(x)))
 706
 707 /* zero an array - note that sizeof(array) must work - ie. it must not be a
 708    pointer */
 709 #define ZERO_ARRAY(x) memset((char *)(x), 0, sizeof(x))
 710
 711 /**
 712  * work out how many elements there are in a static array
 713  */
 714 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
 715
 716 /**
 717  * pointer difference macro
 718  */
 719 #define PTR_DIFF(p1,p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
 720
 721 #if MMAP_BLACKLIST
 722 #undef HAVE_MMAP
 723 #endif
 724
 725 #ifdef __COMPAR_FN_T
 726 #define QSORT_CAST (__compar_fn_t)
 727 #endif
 728
 729 #ifndef QSORT_CAST
 730 #define QSORT_CAST (int (*)(const void *, const void *))
 731 #endif
 732
 733 #ifndef PATH_MAX
 734 #define PATH_MAX 1024
 735 #endif
 736
 737 #ifndef MAX_DNS_NAME_LENGTH
 738 #define MAX_DNS_NAME_LENGTH 256 /* Actually 255 but +1 for terminating null. */
 739 #endif
 740
 741 #ifndef HAVE_CRYPT
 742 char *ufc_crypt(const char *key, const char *salt);
 743 #define crypt ufc_crypt
 744 #else
 745 #ifdef HAVE_CRYPT_H
 746 #include <crypt.h>
 747 #endif
 748 #endif
 749
 750 /* these macros gain us a few percent of speed on gcc */
 751 #if (__GNUC__ >= 3)
 752 /* the strange !! is to ensure that __builtin_expect() takes either 0 or 1
 753    as its first argument */
 754 #ifndef likely
 755 #define likely(x)   __builtin_expect(!!(x), 1)
 756 #endif
 757 #ifndef unlikely
 758 #define unlikely(x) __builtin_expect(!!(x), 0)
 759 #endif
 760 #else
 761 #ifndef likely
 762 #define likely(x) (x)
 763 #endif
 764 #ifndef unlikely
 765 #define unlikely(x) (x)
 766 #endif
 767 #endif
 768
 769 #ifndef HAVE_FDATASYNC
 770 #define fdatasync(fd) fsync(fd)
 771 #elif !defined(HAVE_DECL_FDATASYNC)
 772 int fdatasync(int );
 773 #endif
 774
 775 /* these are used to mark symbols as local to a shared lib, or
 776  * publicly available via the shared lib API */
 777 #ifndef _PUBLIC_
 778 #ifdef HAVE_VISIBILITY_ATTR
 779 #define _PUBLIC_ __attribute__((visibility("default")))
 780 #else
 781 #define _PUBLIC_
 782 #endif
 783 #endif
 784
 785 #ifndef _PRIVATE_
 786 #ifdef HAVE_VISIBILITY_ATTR
 787 #  define _PRIVATE_ __attribute__((visibility("hidden")))
 788 #else
 789 #  define _PRIVATE_
 790 #endif
 791 #endif
 792
 793 #endif /* _LIBREPLACE_REPLACE_H */