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