git-compat-util.h

   1 #ifndef GIT_COMPAT_UTIL_H
   2 #define GIT_COMPAT_UTIL_H
   3
   4 #define _FILE_OFFSET_BITS 64
   5
   6 #ifndef FLEX_ARRAY
   7 /*
   8  * See if our compiler is known to support flexible array members.
   9  */
  10 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  11 # define FLEX_ARRAY /* empty */
  12 #elif defined(__GNUC__)
  13 # if (__GNUC__ >= 3)
  14 #  define FLEX_ARRAY /* empty */
  15 # else
  16 #  define FLEX_ARRAY 0 /* older GNU extension */
  17 # endif
  18 #endif
  19
  20 /*
  21  * Otherwise, default to safer but a bit wasteful traditional style
  22  */
  23 #ifndef FLEX_ARRAY
  24 # define FLEX_ARRAY 1
  25 #endif
  26 #endif
  27
  28 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  29 #define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  30
  31 #define maximum_signed_value_of_type(a) \
  32     (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
  33
  34 #define maximum_unsigned_value_of_type(a) \
  35     (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
  36
  37 /*
  38  * Signed integer overflow is undefined in C, so here's a helper macro
  39  * to detect if the sum of two integers will overflow.
  40  *
  41  * Requires: a >= 0, typeof(a) equals typeof(b)
  42  */
  43 #define signed_add_overflows(a, b) \
  44     ((b) > maximum_signed_value_of_type(a) - (a))
  45
  46 #define unsigned_add_overflows(a, b) \
  47     ((b) > maximum_unsigned_value_of_type(a) - (a))
  48
  49 #ifdef __GNUC__
  50 #define TYPEOF(x) (__typeof__(x))
  51 #else
  52 #define TYPEOF(x)
  53 #endif
  54
  55 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
  56 #define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  57
  58 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  59
  60 /* Approximation of the length of the decimal representation of this type. */
  61 #define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  62
  63 #if defined(__sun__)
  64  /*
  65   * On Solaris, when _XOPEN_EXTENDED is set, its header file
  66   * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
  67   * setting to say we are XPG5 or XPG6.  Also on Solaris,
  68   * XPG6 programs must be compiled with a c99 compiler, while
  69   * non XPG6 programs must be compiled with a pre-c99 compiler.
  70   */
  71 # if __STDC_VERSION__ - 0 >= 199901L
  72 # define _XOPEN_SOURCE 600
  73 # else
  74 # define _XOPEN_SOURCE 500
  75 # endif
  76 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
  77       !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
  78       !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
  79       !defined(__CYGWIN__)
  80 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  81 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  82 #endif
  83 #define _ALL_SOURCE 1
  84 #define _GNU_SOURCE 1
  85 #define _BSD_SOURCE 1
  86 #define _DEFAULT_SOURCE 1
  87 #define _NETBSD_SOURCE 1
  88 #define _SGI_SOURCE 1
  89
  90 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  91 # if defined (_MSC_VER) && !defined(_WIN32_WINNT)
  92 #  define _WIN32_WINNT 0x0502
  93 # endif
  94 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  95 #include <winsock2.h>
  96 #include <windows.h>
  97 #define GIT_WINDOWS_NATIVE
  98 #endif
  99
 100 #include <unistd.h>
 101 #include <stdio.h>
 102 #include <sys/stat.h>
 103 #include <fcntl.h>
 104 #include <stddef.h>
 105 #include <stdlib.h>
 106 #include <stdarg.h>
 107 #include <string.h>
 108 #ifdef HAVE_STRINGS_H
 109 #include <strings.h> /* for strcasecmp() */
 110 #endif
 111 #include <errno.h>
 112 #include <limits.h>
 113 #ifdef NEEDS_SYS_PARAM_H
 114 #include <sys/param.h>
 115 #endif
 116 #include <sys/types.h>
 117 #include <dirent.h>
 118 #include <sys/time.h>
 119 #include <time.h>
 120 #include <signal.h>
 121 #include <assert.h>
 122 #include <regex.h>
 123 #include <utime.h>
 124 #include <syslog.h>
 125 #ifndef NO_SYS_POLL_H
 126 #include <sys/poll.h>
 127 #else
 128 #include <poll.h>
 129 #endif
 130
 131 #if defined(__MINGW32__)
 132 /* pull in Windows compatibility stuff */
 133 #include "compat/mingw.h"
 134 #elif defined(_MSC_VER)
 135 #include "compat/msvc.h"
 136 #else
 137 #include <sys/wait.h>
 138 #include <sys/resource.h>
 139 #include <sys/socket.h>
 140 #include <sys/ioctl.h>
 141 #include <termios.h>
 142 #ifndef NO_SYS_SELECT_H
 143 #include <sys/select.h>
 144 #endif
 145 #include <netinet/in.h>
 146 #include <netinet/tcp.h>
 147 #include <arpa/inet.h>
 148 #include <netdb.h>
 149 #include <pwd.h>
 150 #include <sys/un.h>
 151 #ifndef NO_INTTYPES_H
 152 #include <inttypes.h>
 153 #else
 154 #include <stdint.h>
 155 #endif
 156 #ifdef NO_INTPTR_T
 157 /*
 158  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 159  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 160  * while on IP16 and IP16L32 it is "int" (resp. "short")
 161  * Size needs to match (or exceed) 'sizeof(void *)'.
 162  * We can't take "long long" here as not everybody has it.
 163  */
 164 typedef long intptr_t;
 165 typedef unsigned long uintptr_t;
 166 #endif
 167 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 168 #include <grp.h>
 169 #define _ALL_SOURCE 1
 170 #endif
 171
 172 /* used on Mac OS X */
 173 #ifdef PRECOMPOSE_UNICODE
 174 #include "compat/precompose_utf8.h"
 175 #else
 176 #define precompose_str(in,i_nfd2nfc)
 177 #define precompose_argv(c,v)
 178 #define probe_utf8_pathname_composition(a,b)
 179 #endif
 180
 181 #ifdef MKDIR_WO_TRAILING_SLASH
 182 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 183 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 184 #endif
 185
 186 #ifdef NO_STRUCT_ITIMERVAL
 187 struct itimerval {
 188         struct timeval it_interval;
 189         struct timeval it_value;
 190 };
 191 #endif
 192
 193 #ifdef NO_SETITIMER
 194 #define setitimer(which,value,ovalue)
 195 #endif
 196
 197 #ifndef NO_LIBGEN_H
 198 #include <libgen.h>
 199 #else
 200 #define basename gitbasename
 201 extern char *gitbasename(char *);
 202 #endif
 203
 204 #ifndef NO_ICONV
 205 #include <iconv.h>
 206 #endif
 207
 208 #ifndef NO_OPENSSL
 209 #ifdef __APPLE__
 210 #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 211 #include <AvailabilityMacros.h>
 212 #undef DEPRECATED_ATTRIBUTE
 213 #define DEPRECATED_ATTRIBUTE
 214 #undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 215 #endif
 216 #include <openssl/ssl.h>
 217 #include <openssl/err.h>
 218 #ifdef NO_HMAC_CTX_CLEANUP
 219 #define HMAC_CTX_cleanup HMAC_cleanup
 220 #endif
 221 #endif
 222
 223 /* On most systems <netdb.h> would have given us this, but
 224  * not on some systems (e.g. z/OS).
 225  */
 226 #ifndef NI_MAXHOST
 227 #define NI_MAXHOST 1025
 228 #endif
 229
 230 #ifndef NI_MAXSERV
 231 #define NI_MAXSERV 32
 232 #endif
 233
 234 /* On most systems <limits.h> would have given us this, but
 235  * not on some systems (e.g. GNU/Hurd).
 236  */
 237 #ifndef PATH_MAX
 238 #define PATH_MAX 4096
 239 #endif
 240
 241 #ifndef PRIuMAX
 242 #define PRIuMAX "llu"
 243 #endif
 244
 245 #ifndef PRIu32
 246 #define PRIu32 "u"
 247 #endif
 248
 249 #ifndef PRIx32
 250 #define PRIx32 "x"
 251 #endif
 252
 253 #ifndef PRIo32
 254 #define PRIo32 "o"
 255 #endif
 256
 257 #ifndef PATH_SEP
 258 #define PATH_SEP ':'
 259 #endif
 260
 261 #ifdef HAVE_PATHS_H
 262 #include <paths.h>
 263 #endif
 264 #ifndef _PATH_DEFPATH
 265 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 266 #endif
 267
 268 #ifndef STRIP_EXTENSION
 269 #define STRIP_EXTENSION ""
 270 #endif
 271
 272 #ifndef has_dos_drive_prefix
 273 static inline int git_has_dos_drive_prefix(const char *path)
 274 {
 275         return 0;
 276 }
 277 #define has_dos_drive_prefix git_has_dos_drive_prefix
 278 #endif
 279
 280 #ifndef is_dir_sep
 281 static inline int git_is_dir_sep(int c)
 282 {
 283         return c == '/';
 284 }
 285 #define is_dir_sep git_is_dir_sep
 286 #endif
 287
 288 #ifndef offset_1st_component
 289 static inline int git_offset_1st_component(const char *path)
 290 {
 291         return is_dir_sep(path[0]);
 292 }
 293 #define offset_1st_component git_offset_1st_component
 294 #endif
 295
 296 #ifndef find_last_dir_sep
 297 static inline char *git_find_last_dir_sep(const char *path)
 298 {
 299         return strrchr(path, '/');
 300 }
 301 #define find_last_dir_sep git_find_last_dir_sep
 302 #endif
 303
 304 #if defined(__HP_cc) && (__HP_cc >= 61000)
 305 #define NORETURN __attribute__((noreturn))
 306 #define NORETURN_PTR
 307 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 308 #define NORETURN __attribute__((__noreturn__))
 309 #define NORETURN_PTR __attribute__((__noreturn__))
 310 #elif defined(_MSC_VER)
 311 #define NORETURN __declspec(noreturn)
 312 #define NORETURN_PTR
 313 #else
 314 #define NORETURN
 315 #define NORETURN_PTR
 316 #ifndef __GNUC__
 317 #ifndef __attribute__
 318 #define __attribute__(x)
 319 #endif
 320 #endif
 321 #endif
 322
 323 /* The sentinel attribute is valid from gcc version 4.0 */
 324 #if defined(__GNUC__) && (__GNUC__ >= 4)
 325 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 326 #else
 327 #define LAST_ARG_MUST_BE_NULL
 328 #endif
 329
 330 #include "compat/bswap.h"
 331
 332 #include "wildmatch.h"
 333
 334 struct strbuf;
 335
 336 /* General helper functions */
 337 extern void vreportf(const char *prefix, const char *err, va_list params);
 338 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 339 extern NORETURN void usage(const char *err);
 340 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 341 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 342 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 343 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 344 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 345
 346 #ifndef NO_OPENSSL
 347 #ifdef APPLE_COMMON_CRYPTO
 348 #include "compat/apple-common-crypto.h"
 349 #else
 350 #include <openssl/evp.h>
 351 #include <openssl/hmac.h>
 352 #endif /* APPLE_COMMON_CRYPTO */
 353 #include <openssl/x509v3.h>
 354 #endif /* NO_OPENSSL */
 355
 356 /*
 357  * Let callers be aware of the constant return value; this can help
 358  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 359  * because some compilers may not support variadic macros. Since we're only
 360  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 361  * using the function as usual.
 362  */
 363 #if defined(__GNUC__)
 364 static inline int const_error(void)
 365 {
 366         return -1;
 367 }
 368 #define error(...) (error(__VA_ARGS__), const_error())
 369 #endif
 370
 371 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 372 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 373 extern void set_die_is_recursing_routine(int (*routine)(void));
 374
 375 extern int starts_with(const char *str, const char *prefix);
 376
 377 /*
 378  * If the string "str" begins with the string found in "prefix", return 1.
 379  * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 380  * the string right after the prefix).
 381  *
 382  * Otherwise, return 0 and leave "out" untouched.
 383  *
 384  * Examples:
 385  *
 386  *   [extract branch name, fail if not a branch]
 387  *   if (!skip_prefix(ref, "refs/heads/", &branch)
 388  *      return -1;
 389  *
 390  *   [skip prefix if present, otherwise use whole string]
 391  *   skip_prefix(name, "refs/heads/", &name);
 392  */
 393 static inline int skip_prefix(const char *str, const char *prefix,
 394                               const char **out)
 395 {
 396         do {
 397                 if (!*prefix) {
 398                         *out = str;
 399                         return 1;
 400                 }
 401         } while (*str++ == *prefix++);
 402         return 0;
 403 }
 404
 405 /*
 406  * If buf ends with suffix, return 1 and subtract the length of the suffix
 407  * from *len. Otherwise, return 0 and leave *len untouched.
 408  */
 409 static inline int strip_suffix_mem(const char *buf, size_t *len,
 410                                    const char *suffix)
 411 {
 412         size_t suflen = strlen(suffix);
 413         if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 414                 return 0;
 415         *len -= suflen;
 416         return 1;
 417 }
 418
 419 /*
 420  * If str ends with suffix, return 1 and set *len to the size of the string
 421  * without the suffix. Otherwise, return 0 and set *len to the size of the
 422  * string.
 423  *
 424  * Note that we do _not_ NUL-terminate str to the new length.
 425  */
 426 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 427 {
 428         *len = strlen(str);
 429         return strip_suffix_mem(str, len, suffix);
 430 }
 431
 432 static inline int ends_with(const char *str, const char *suffix)
 433 {
 434         size_t len;
 435         return strip_suffix(str, suffix, &len);
 436 }
 437
 438 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 439
 440 #ifndef PROT_READ
 441 #define PROT_READ 1
 442 #define PROT_WRITE 2
 443 #define MAP_PRIVATE 1
 444 #endif
 445
 446 #define mmap git_mmap
 447 #define munmap git_munmap
 448 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 449 extern int git_munmap(void *start, size_t length);
 450
 451 #else /* NO_MMAP || USE_WIN32_MMAP */
 452
 453 #include <sys/mman.h>
 454
 455 #endif /* NO_MMAP || USE_WIN32_MMAP */
 456
 457 #ifdef NO_MMAP
 458
 459 /* This value must be multiple of (pagesize * 2) */
 460 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 461
 462 #else /* NO_MMAP */
 463
 464 /* This value must be multiple of (pagesize * 2) */
 465 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 466         (sizeof(void*) >= 8 \
 467                 ?  1 * 1024 * 1024 * 1024 \
 468                 : 32 * 1024 * 1024)
 469
 470 #endif /* NO_MMAP */
 471
 472 #ifndef MAP_FAILED
 473 #define MAP_FAILED ((void *)-1)
 474 #endif
 475
 476 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 477 #define on_disk_bytes(st) ((st).st_size)
 478 #else
 479 #define on_disk_bytes(st) ((st).st_blocks * 512)
 480 #endif
 481
 482 #ifdef NEEDS_MODE_TRANSLATION
 483 #undef S_IFMT
 484 #undef S_IFREG
 485 #undef S_IFDIR
 486 #undef S_IFLNK
 487 #undef S_IFBLK
 488 #undef S_IFCHR
 489 #undef S_IFIFO
 490 #undef S_IFSOCK
 491 #define S_IFMT   0170000
 492 #define S_IFREG  0100000
 493 #define S_IFDIR  0040000
 494 #define S_IFLNK  0120000
 495 #define S_IFBLK  0060000
 496 #define S_IFCHR  0020000
 497 #define S_IFIFO  0010000
 498 #define S_IFSOCK 0140000
 499 #ifdef stat
 500 #undef stat
 501 #endif
 502 #define stat(path, buf) git_stat(path, buf)
 503 extern int git_stat(const char *, struct stat *);
 504 #ifdef fstat
 505 #undef fstat
 506 #endif
 507 #define fstat(fd, buf) git_fstat(fd, buf)
 508 extern int git_fstat(int, struct stat *);
 509 #ifdef lstat
 510 #undef lstat
 511 #endif
 512 #define lstat(path, buf) git_lstat(path, buf)
 513 extern int git_lstat(const char *, struct stat *);
 514 #endif
 515
 516 #define DEFAULT_PACKED_GIT_LIMIT \
 517         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 518
 519 #ifdef NO_PREAD
 520 #define pread git_pread
 521 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 522 #endif
 523 /*
 524  * Forward decl that will remind us if its twin in cache.h changes.
 525  * This function is used in compat/pread.c.  But we can't include
 526  * cache.h there.
 527  */
 528 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 529
 530 #ifdef NO_SETENV
 531 #define setenv gitsetenv
 532 extern int gitsetenv(const char *, const char *, int);
 533 #endif
 534
 535 #ifdef NO_MKDTEMP
 536 #define mkdtemp gitmkdtemp
 537 extern char *gitmkdtemp(char *);
 538 #endif
 539
 540 #ifdef NO_MKSTEMPS
 541 #define mkstemps gitmkstemps
 542 extern int gitmkstemps(char *, int);
 543 #endif
 544
 545 #ifdef NO_UNSETENV
 546 #define unsetenv gitunsetenv
 547 extern void gitunsetenv(const char *);
 548 #endif
 549
 550 #ifdef NO_STRCASESTR
 551 #define strcasestr gitstrcasestr
 552 extern char *gitstrcasestr(const char *haystack, const char *needle);
 553 #endif
 554
 555 #ifdef NO_STRLCPY
 556 #define strlcpy gitstrlcpy
 557 extern size_t gitstrlcpy(char *, const char *, size_t);
 558 #endif
 559
 560 #ifdef NO_STRTOUMAX
 561 #define strtoumax gitstrtoumax
 562 extern uintmax_t gitstrtoumax(const char *, char **, int);
 563 #define strtoimax gitstrtoimax
 564 extern intmax_t gitstrtoimax(const char *, char **, int);
 565 #endif
 566
 567 #ifdef NO_HSTRERROR
 568 #define hstrerror githstrerror
 569 extern const char *githstrerror(int herror);
 570 #endif
 571
 572 #ifdef NO_MEMMEM
 573 #define memmem gitmemmem
 574 void *gitmemmem(const void *haystack, size_t haystacklen,
 575                 const void *needle, size_t needlelen);
 576 #endif
 577
 578 #ifdef NO_GETPAGESIZE
 579 #define getpagesize() sysconf(_SC_PAGESIZE)
 580 #endif
 581
 582 #ifdef FREAD_READS_DIRECTORIES
 583 #ifdef fopen
 584 #undef fopen
 585 #endif
 586 #define fopen(a,b) git_fopen(a,b)
 587 extern FILE *git_fopen(const char*, const char*);
 588 #endif
 589
 590 #ifdef SNPRINTF_RETURNS_BOGUS
 591 #ifdef snprintf
 592 #undef snprintf
 593 #endif
 594 #define snprintf git_snprintf
 595 extern int git_snprintf(char *str, size_t maxsize,
 596                         const char *format, ...);
 597 #ifdef vsnprintf
 598 #undef vsnprintf
 599 #endif
 600 #define vsnprintf git_vsnprintf
 601 extern int git_vsnprintf(char *str, size_t maxsize,
 602                          const char *format, va_list ap);
 603 #endif
 604
 605 #ifdef __GLIBC_PREREQ
 606 #if __GLIBC_PREREQ(2, 1)
 607 #define HAVE_STRCHRNUL
 608 #define HAVE_MEMPCPY
 609 #endif
 610 #endif
 611
 612 #ifndef HAVE_STRCHRNUL
 613 #define strchrnul gitstrchrnul
 614 static inline char *gitstrchrnul(const char *s, int c)
 615 {
 616         while (*s && *s != c)
 617                 s++;
 618         return (char *)s;
 619 }
 620 #endif
 621
 622 #ifndef HAVE_MEMPCPY
 623 #define mempcpy gitmempcpy
 624 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 625 {
 626         return (char *)memcpy(dest, src, n) + n;
 627 }
 628 #endif
 629
 630 #ifdef NO_INET_PTON
 631 int inet_pton(int af, const char *src, void *dst);
 632 #endif
 633
 634 #ifdef NO_INET_NTOP
 635 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 636 #endif
 637
 638 #ifdef NO_PTHREADS
 639 #define atexit git_atexit
 640 extern int git_atexit(void (*handler)(void));
 641 #endif
 642
 643 extern void release_pack_memory(size_t);
 644
 645 typedef void (*try_to_free_t)(size_t);
 646 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 647
 648 #ifdef HAVE_ALLOCA_H
 649 # include <alloca.h>
 650 # define xalloca(size)      (alloca(size))
 651 # define xalloca_free(p)    do {} while (0)
 652 #else
 653 # define xalloca(size)      (xmalloc(size))
 654 # define xalloca_free(p)    (free(p))
 655 #endif
 656 extern char *xstrdup(const char *str);
 657 extern void *xmalloc(size_t size);
 658 extern void *xmallocz(size_t size);
 659 extern void *xmallocz_gently(size_t size);
 660 extern void *xmemdupz(const void *data, size_t len);
 661 extern char *xstrndup(const char *str, size_t len);
 662 extern void *xrealloc(void *ptr, size_t size);
 663 extern void *xcalloc(size_t nmemb, size_t size);
 664 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 665 extern ssize_t xread(int fd, void *buf, size_t len);
 666 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 667 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 668 extern int xdup(int fd);
 669 extern FILE *xfdopen(int fd, const char *mode);
 670 extern int xmkstemp(char *template);
 671 extern int xmkstemp_mode(char *template, int mode);
 672 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 673 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 674 extern char *xgetcwd(void);
 675
 676 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 677
 678 static inline char *xstrdup_or_null(const char *str)
 679 {
 680         return str ? xstrdup(str) : NULL;
 681 }
 682
 683 static inline size_t xsize_t(off_t len)
 684 {
 685         if (len > (size_t) len)
 686                 die("Cannot handle files this big");
 687         return (size_t)len;
 688 }
 689
 690 /* in ctype.c, for kwset users */
 691 extern const unsigned char tolower_trans_tbl[256];
 692
 693 /* Sane ctype - no locale, and works with signed chars */
 694 #undef isascii
 695 #undef isspace
 696 #undef isdigit
 697 #undef isalpha
 698 #undef isalnum
 699 #undef isprint
 700 #undef islower
 701 #undef isupper
 702 #undef tolower
 703 #undef toupper
 704 #undef iscntrl
 705 #undef ispunct
 706 #undef isxdigit
 707
 708 extern const unsigned char sane_ctype[256];
 709 #define GIT_SPACE 0x01
 710 #define GIT_DIGIT 0x02
 711 #define GIT_ALPHA 0x04
 712 #define GIT_GLOB_SPECIAL 0x08
 713 #define GIT_REGEX_SPECIAL 0x10
 714 #define GIT_PATHSPEC_MAGIC 0x20
 715 #define GIT_CNTRL 0x40
 716 #define GIT_PUNCT 0x80
 717 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 718 #define isascii(x) (((x) & ~0x7f) == 0)
 719 #define isspace(x) sane_istest(x,GIT_SPACE)
 720 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 721 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 722 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 723 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 724 #define islower(x) sane_iscase(x, 1)
 725 #define isupper(x) sane_iscase(x, 0)
 726 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 727 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 728 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 729 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 730                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 731 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 732 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 733 #define toupper(x) sane_case((unsigned char)(x), 0)
 734 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 735
 736 static inline int sane_case(int x, int high)
 737 {
 738         if (sane_istest(x, GIT_ALPHA))
 739                 x = (x & ~0x20) | high;
 740         return x;
 741 }
 742
 743 static inline int sane_iscase(int x, int is_lower)
 744 {
 745         if (!sane_istest(x, GIT_ALPHA))
 746                 return 0;
 747
 748         if (is_lower)
 749                 return (x & 0x20) != 0;
 750         else
 751                 return (x & 0x20) == 0;
 752 }
 753
 754 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 755 {
 756         unsigned long ul;
 757         char *p;
 758
 759         errno = 0;
 760         ul = strtoul(s, &p, base);
 761         if (errno || *p || p == s || (unsigned int) ul != ul)
 762                 return -1;
 763         *result = ul;
 764         return 0;
 765 }
 766
 767 static inline int strtol_i(char const *s, int base, int *result)
 768 {
 769         long ul;
 770         char *p;
 771
 772         errno = 0;
 773         ul = strtol(s, &p, base);
 774         if (errno || *p || p == s || (int) ul != ul)
 775                 return -1;
 776         *result = ul;
 777         return 0;
 778 }
 779
 780 #ifdef INTERNAL_QSORT
 781 void git_qsort(void *base, size_t nmemb, size_t size,
 782                int(*compar)(const void *, const void *));
 783 #define qsort git_qsort
 784 #endif
 785
 786 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 787 # define FORCE_DIR_SET_GID S_ISGID
 788 #else
 789 # define FORCE_DIR_SET_GID 0
 790 #endif
 791
 792 #ifdef NO_NSEC
 793 #undef USE_NSEC
 794 #define ST_CTIME_NSEC(st) 0
 795 #define ST_MTIME_NSEC(st) 0
 796 #else
 797 #ifdef USE_ST_TIMESPEC
 798 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 799 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 800 #else
 801 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 802 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 803 #endif
 804 #endif
 805
 806 #ifdef UNRELIABLE_FSTAT
 807 #define fstat_is_reliable() 0
 808 #else
 809 #define fstat_is_reliable() 1
 810 #endif
 811
 812 #ifndef va_copy
 813 /*
 814  * Since an obvious implementation of va_list would be to make it a
 815  * pointer into the stack frame, a simple assignment will work on
 816  * many systems.  But let's try to be more portable.
 817  */
 818 #ifdef __va_copy
 819 #define va_copy(dst, src) __va_copy(dst, src)
 820 #else
 821 #define va_copy(dst, src) ((dst) = (src))
 822 #endif
 823 #endif
 824
 825 #if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 826 #define HAVE_VARIADIC_MACROS 1
 827 #endif
 828
 829 /*
 830  * Preserves errno, prints a message, but gives no warning for ENOENT.
 831  * Returns 0 on success, which includes trying to unlink an object that does
 832  * not exist.
 833  */
 834 int unlink_or_warn(const char *path);
 835  /*
 836   * Tries to unlink file.  Returns 0 if unlink succeeded
 837   * or the file already didn't exist.  Returns -1 and
 838   * appends a message to err suitable for
 839   * 'error("%s", err->buf)' on error.
 840   */
 841 int unlink_or_msg(const char *file, struct strbuf *err);
 842 /*
 843  * Preserves errno, prints a message, but gives no warning for ENOENT.
 844  * Returns 0 on success, which includes trying to remove a directory that does
 845  * not exist.
 846  */
 847 int rmdir_or_warn(const char *path);
 848 /*
 849  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 850  * the supplied file mode.
 851  */
 852 int remove_or_warn(unsigned int mode, const char *path);
 853
 854 /*
 855  * Call access(2), but warn for any error except "missing file"
 856  * (ENOENT or ENOTDIR).
 857  */
 858 #define ACCESS_EACCES_OK (1U << 0)
 859 int access_or_warn(const char *path, int mode, unsigned flag);
 860 int access_or_die(const char *path, int mode, unsigned flag);
 861
 862 /* Warn on an inaccessible file that ought to be accessible */
 863 void warn_on_inaccessible(const char *path);
 864
 865 /* Get the passwd entry for the UID of the current process. */
 866 struct passwd *xgetpwuid_self(void);
 867
 868 #ifdef GMTIME_UNRELIABLE_ERRORS
 869 struct tm *git_gmtime(const time_t *);
 870 struct tm *git_gmtime_r(const time_t *, struct tm *);
 871 #define gmtime git_gmtime
 872 #define gmtime_r git_gmtime_r
 873 #endif
 874
 875 #if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 876 #define USE_PARENS_AROUND_GETTEXT_N 1
 877 #endif
 878
 879 #endif