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 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  80 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  81 #endif
  82 #define _ALL_SOURCE 1
  83 #define _GNU_SOURCE 1
  84 #define _BSD_SOURCE 1
  85 #define _DEFAULT_SOURCE 1
  86 #define _NETBSD_SOURCE 1
  87 #define _SGI_SOURCE 1
  88
  89 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  90 # if defined (_MSC_VER) && !defined(_WIN32_WINNT)
  91 #  define _WIN32_WINNT 0x0502
  92 # endif
  93 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  94 #include <winsock2.h>
  95 #include <windows.h>
  96 #define GIT_WINDOWS_NATIVE
  97 #endif
  98
  99 #include <unistd.h>
 100 #include <stdio.h>
 101 #include <sys/stat.h>
 102 #include <fcntl.h>
 103 #include <stddef.h>
 104 #include <stdlib.h>
 105 #include <stdarg.h>
 106 #include <string.h>
 107 #ifdef HAVE_STRINGS_H
 108 #include <strings.h> /* for strcasecmp() */
 109 #endif
 110 #include <errno.h>
 111 #include <limits.h>
 112 #ifdef NEEDS_SYS_PARAM_H
 113 #include <sys/param.h>
 114 #endif
 115 #include <sys/types.h>
 116 #include <dirent.h>
 117 #include <sys/time.h>
 118 #include <time.h>
 119 #include <signal.h>
 120 #include <assert.h>
 121 #include <regex.h>
 122 #include <utime.h>
 123 #include <syslog.h>
 124 #ifndef NO_SYS_POLL_H
 125 #include <sys/poll.h>
 126 #else
 127 #include <poll.h>
 128 #endif
 129
 130 #if defined(__MINGW32__)
 131 /* pull in Windows compatibility stuff */
 132 #include "compat/mingw.h"
 133 #elif defined(_MSC_VER)
 134 #include "compat/msvc.h"
 135 #else
 136 #include <sys/wait.h>
 137 #include <sys/resource.h>
 138 #include <sys/socket.h>
 139 #include <sys/ioctl.h>
 140 #include <termios.h>
 141 #ifndef NO_SYS_SELECT_H
 142 #include <sys/select.h>
 143 #endif
 144 #include <netinet/in.h>
 145 #include <netinet/tcp.h>
 146 #include <arpa/inet.h>
 147 #include <netdb.h>
 148 #include <pwd.h>
 149 #include <sys/un.h>
 150 #ifndef NO_INTTYPES_H
 151 #include <inttypes.h>
 152 #else
 153 #include <stdint.h>
 154 #endif
 155 #ifdef NO_INTPTR_T
 156 /*
 157  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 158  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 159  * while on IP16 and IP16L32 it is "int" (resp. "short")
 160  * Size needs to match (or exceed) 'sizeof(void *)'.
 161  * We can't take "long long" here as not everybody has it.
 162  */
 163 typedef long intptr_t;
 164 typedef unsigned long uintptr_t;
 165 #endif
 166 #if defined(__CYGWIN__)
 167 #undef _XOPEN_SOURCE
 168 #include <grp.h>
 169 #define _XOPEN_SOURCE 600
 170 #else
 171 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 172 #include <grp.h>
 173 #define _ALL_SOURCE 1
 174 #endif
 175 #endif
 176
 177 /* used on Mac OS X */
 178 #ifdef PRECOMPOSE_UNICODE
 179 #include "compat/precompose_utf8.h"
 180 #else
 181 #define precompose_str(in,i_nfd2nfc)
 182 #define precompose_argv(c,v)
 183 #define probe_utf8_pathname_composition(a,b)
 184 #endif
 185
 186 #ifdef MKDIR_WO_TRAILING_SLASH
 187 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 188 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 189 #endif
 190
 191 #ifdef NO_STRUCT_ITIMERVAL
 192 struct itimerval {
 193         struct timeval it_interval;
 194         struct timeval it_value;
 195 };
 196 #endif
 197
 198 #ifdef NO_SETITIMER
 199 #define setitimer(which,value,ovalue)
 200 #endif
 201
 202 #ifndef NO_LIBGEN_H
 203 #include <libgen.h>
 204 #else
 205 #define basename gitbasename
 206 extern char *gitbasename(char *);
 207 #endif
 208
 209 #ifndef NO_ICONV
 210 #include <iconv.h>
 211 #endif
 212
 213 #ifndef NO_OPENSSL
 214 #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 215 #define MAC_OS_X_VERSION_MIN_REQUIRED MAC_OS_X_VERSION_10_6
 216 #include <openssl/ssl.h>
 217 #include <openssl/err.h>
 218 #undef MAC_OS_X_VERSION_MIN_REQUIRED
 219 #undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 220 #endif
 221
 222 /* On most systems <netdb.h> would have given us this, but
 223  * not on some systems (e.g. z/OS).
 224  */
 225 #ifndef NI_MAXHOST
 226 #define NI_MAXHOST 1025
 227 #endif
 228
 229 #ifndef NI_MAXSERV
 230 #define NI_MAXSERV 32
 231 #endif
 232
 233 /* On most systems <limits.h> would have given us this, but
 234  * not on some systems (e.g. GNU/Hurd).
 235  */
 236 #ifndef PATH_MAX
 237 #define PATH_MAX 4096
 238 #endif
 239
 240 #ifndef PRIuMAX
 241 #define PRIuMAX "llu"
 242 #endif
 243
 244 #ifndef PRIu32
 245 #define PRIu32 "u"
 246 #endif
 247
 248 #ifndef PRIx32
 249 #define PRIx32 "x"
 250 #endif
 251
 252 #ifndef PRIo32
 253 #define PRIo32 "o"
 254 #endif
 255
 256 #ifndef PATH_SEP
 257 #define PATH_SEP ':'
 258 #endif
 259
 260 #ifdef HAVE_PATHS_H
 261 #include <paths.h>
 262 #endif
 263 #ifndef _PATH_DEFPATH
 264 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 265 #endif
 266
 267 #ifndef STRIP_EXTENSION
 268 #define STRIP_EXTENSION ""
 269 #endif
 270
 271 #ifndef has_dos_drive_prefix
 272 static inline int git_has_dos_drive_prefix(const char *path)
 273 {
 274         return 0;
 275 }
 276 #define has_dos_drive_prefix git_has_dos_drive_prefix
 277 #endif
 278
 279 #ifndef is_dir_sep
 280 static inline int git_is_dir_sep(int c)
 281 {
 282         return c == '/';
 283 }
 284 #define is_dir_sep git_is_dir_sep
 285 #endif
 286
 287 #ifndef offset_1st_component
 288 static inline int git_offset_1st_component(const char *path)
 289 {
 290         return is_dir_sep(path[0]);
 291 }
 292 #define offset_1st_component git_offset_1st_component
 293 #endif
 294
 295 #ifndef find_last_dir_sep
 296 static inline char *git_find_last_dir_sep(const char *path)
 297 {
 298         return strrchr(path, '/');
 299 }
 300 #define find_last_dir_sep git_find_last_dir_sep
 301 #endif
 302
 303 #if defined(__HP_cc) && (__HP_cc >= 61000)
 304 #define NORETURN __attribute__((noreturn))
 305 #define NORETURN_PTR
 306 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 307 #define NORETURN __attribute__((__noreturn__))
 308 #define NORETURN_PTR __attribute__((__noreturn__))
 309 #elif defined(_MSC_VER)
 310 #define NORETURN __declspec(noreturn)
 311 #define NORETURN_PTR
 312 #else
 313 #define NORETURN
 314 #define NORETURN_PTR
 315 #ifndef __GNUC__
 316 #ifndef __attribute__
 317 #define __attribute__(x)
 318 #endif
 319 #endif
 320 #endif
 321
 322 /* The sentinel attribute is valid from gcc version 4.0 */
 323 #if defined(__GNUC__) && (__GNUC__ >= 4)
 324 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 325 #else
 326 #define LAST_ARG_MUST_BE_NULL
 327 #endif
 328
 329 #include "compat/bswap.h"
 330
 331 #include "wildmatch.h"
 332
 333 struct strbuf;
 334
 335 /* General helper functions */
 336 extern void vreportf(const char *prefix, const char *err, va_list params);
 337 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 338 extern NORETURN void usage(const char *err);
 339 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 340 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 341 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 342 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 343 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 344
 345 #ifndef NO_OPENSSL
 346 #ifdef APPLE_COMMON_CRYPTO
 347 #include "compat/apple-common-crypto.h"
 348 #else
 349 #include <openssl/evp.h>
 350 #include <openssl/hmac.h>
 351 #endif /* APPLE_COMMON_CRYPTO */
 352 #include <openssl/x509v3.h>
 353 #endif /* NO_OPENSSL */
 354
 355 /*
 356  * Let callers be aware of the constant return value; this can help
 357  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 358  * because some compilers may not support variadic macros. Since we're only
 359  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 360  * using the function as usual.
 361  */
 362 #if defined(__GNUC__)
 363 static inline int const_error(void)
 364 {
 365         return -1;
 366 }
 367 #define error(...) (error(__VA_ARGS__), const_error())
 368 #endif
 369
 370 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 371 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 372 extern void set_die_is_recursing_routine(int (*routine)(void));
 373
 374 extern int starts_with(const char *str, const char *prefix);
 375
 376 /*
 377  * If the string "str" begins with the string found in "prefix", return 1.
 378  * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 379  * the string right after the prefix).
 380  *
 381  * Otherwise, return 0 and leave "out" untouched.
 382  *
 383  * Examples:
 384  *
 385  *   [extract branch name, fail if not a branch]
 386  *   if (!skip_prefix(ref, "refs/heads/", &branch)
 387  *      return -1;
 388  *
 389  *   [skip prefix if present, otherwise use whole string]
 390  *   skip_prefix(name, "refs/heads/", &name);
 391  */
 392 static inline int skip_prefix(const char *str, const char *prefix,
 393                               const char **out)
 394 {
 395         do {
 396                 if (!*prefix) {
 397                         *out = str;
 398                         return 1;
 399                 }
 400         } while (*str++ == *prefix++);
 401         return 0;
 402 }
 403
 404 /*
 405  * If buf ends with suffix, return 1 and subtract the length of the suffix
 406  * from *len. Otherwise, return 0 and leave *len untouched.
 407  */
 408 static inline int strip_suffix_mem(const char *buf, size_t *len,
 409                                    const char *suffix)
 410 {
 411         size_t suflen = strlen(suffix);
 412         if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 413                 return 0;
 414         *len -= suflen;
 415         return 1;
 416 }
 417
 418 /*
 419  * If str ends with suffix, return 1 and set *len to the size of the string
 420  * without the suffix. Otherwise, return 0 and set *len to the size of the
 421  * string.
 422  *
 423  * Note that we do _not_ NUL-terminate str to the new length.
 424  */
 425 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 426 {
 427         *len = strlen(str);
 428         return strip_suffix_mem(str, len, suffix);
 429 }
 430
 431 static inline int ends_with(const char *str, const char *suffix)
 432 {
 433         size_t len;
 434         return strip_suffix(str, suffix, &len);
 435 }
 436
 437 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 438
 439 #ifndef PROT_READ
 440 #define PROT_READ 1
 441 #define PROT_WRITE 2
 442 #define MAP_PRIVATE 1
 443 #endif
 444
 445 #define mmap git_mmap
 446 #define munmap git_munmap
 447 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 448 extern int git_munmap(void *start, size_t length);
 449
 450 #else /* NO_MMAP || USE_WIN32_MMAP */
 451
 452 #include <sys/mman.h>
 453
 454 #endif /* NO_MMAP || USE_WIN32_MMAP */
 455
 456 #ifdef NO_MMAP
 457
 458 /* This value must be multiple of (pagesize * 2) */
 459 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 460
 461 #else /* NO_MMAP */
 462
 463 /* This value must be multiple of (pagesize * 2) */
 464 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 465         (sizeof(void*) >= 8 \
 466                 ?  1 * 1024 * 1024 * 1024 \
 467                 : 32 * 1024 * 1024)
 468
 469 #endif /* NO_MMAP */
 470
 471 #ifndef MAP_FAILED
 472 #define MAP_FAILED ((void *)-1)
 473 #endif
 474
 475 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 476 #define on_disk_bytes(st) ((st).st_size)
 477 #else
 478 #define on_disk_bytes(st) ((st).st_blocks * 512)
 479 #endif
 480
 481 #define DEFAULT_PACKED_GIT_LIMIT \
 482         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 483
 484 #ifdef NO_PREAD
 485 #define pread git_pread
 486 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 487 #endif
 488 /*
 489  * Forward decl that will remind us if its twin in cache.h changes.
 490  * This function is used in compat/pread.c.  But we can't include
 491  * cache.h there.
 492  */
 493 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 494
 495 #ifdef NO_SETENV
 496 #define setenv gitsetenv
 497 extern int gitsetenv(const char *, const char *, int);
 498 #endif
 499
 500 #ifdef NO_MKDTEMP
 501 #define mkdtemp gitmkdtemp
 502 extern char *gitmkdtemp(char *);
 503 #endif
 504
 505 #ifdef NO_MKSTEMPS
 506 #define mkstemps gitmkstemps
 507 extern int gitmkstemps(char *, int);
 508 #endif
 509
 510 #ifdef NO_UNSETENV
 511 #define unsetenv gitunsetenv
 512 extern void gitunsetenv(const char *);
 513 #endif
 514
 515 #ifdef NO_STRCASESTR
 516 #define strcasestr gitstrcasestr
 517 extern char *gitstrcasestr(const char *haystack, const char *needle);
 518 #endif
 519
 520 #ifdef NO_STRLCPY
 521 #define strlcpy gitstrlcpy
 522 extern size_t gitstrlcpy(char *, const char *, size_t);
 523 #endif
 524
 525 #ifdef NO_STRTOUMAX
 526 #define strtoumax gitstrtoumax
 527 extern uintmax_t gitstrtoumax(const char *, char **, int);
 528 #define strtoimax gitstrtoimax
 529 extern intmax_t gitstrtoimax(const char *, char **, int);
 530 #endif
 531
 532 #ifdef NO_HSTRERROR
 533 #define hstrerror githstrerror
 534 extern const char *githstrerror(int herror);
 535 #endif
 536
 537 #ifdef NO_MEMMEM
 538 #define memmem gitmemmem
 539 void *gitmemmem(const void *haystack, size_t haystacklen,
 540                 const void *needle, size_t needlelen);
 541 #endif
 542
 543 #ifdef NO_GETPAGESIZE
 544 #define getpagesize() sysconf(_SC_PAGESIZE)
 545 #endif
 546
 547 #ifdef FREAD_READS_DIRECTORIES
 548 #ifdef fopen
 549 #undef fopen
 550 #endif
 551 #define fopen(a,b) git_fopen(a,b)
 552 extern FILE *git_fopen(const char*, const char*);
 553 #endif
 554
 555 #ifdef SNPRINTF_RETURNS_BOGUS
 556 #ifdef snprintf
 557 #undef snprintf
 558 #endif
 559 #define snprintf git_snprintf
 560 extern int git_snprintf(char *str, size_t maxsize,
 561                         const char *format, ...);
 562 #ifdef vsnprintf
 563 #undef vsnprintf
 564 #endif
 565 #define vsnprintf git_vsnprintf
 566 extern int git_vsnprintf(char *str, size_t maxsize,
 567                          const char *format, va_list ap);
 568 #endif
 569
 570 #ifdef __GLIBC_PREREQ
 571 #if __GLIBC_PREREQ(2, 1)
 572 #define HAVE_STRCHRNUL
 573 #define HAVE_MEMPCPY
 574 #endif
 575 #endif
 576
 577 #ifndef HAVE_STRCHRNUL
 578 #define strchrnul gitstrchrnul
 579 static inline char *gitstrchrnul(const char *s, int c)
 580 {
 581         while (*s && *s != c)
 582                 s++;
 583         return (char *)s;
 584 }
 585 #endif
 586
 587 #ifndef HAVE_MEMPCPY
 588 #define mempcpy gitmempcpy
 589 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 590 {
 591         return (char *)memcpy(dest, src, n) + n;
 592 }
 593 #endif
 594
 595 #ifdef NO_INET_PTON
 596 int inet_pton(int af, const char *src, void *dst);
 597 #endif
 598
 599 #ifdef NO_INET_NTOP
 600 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 601 #endif
 602
 603 #ifdef NO_PTHREADS
 604 #define atexit git_atexit
 605 extern int git_atexit(void (*handler)(void));
 606 #endif
 607
 608 extern void release_pack_memory(size_t);
 609
 610 typedef void (*try_to_free_t)(size_t);
 611 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 612
 613 #ifdef HAVE_ALLOCA_H
 614 # include <alloca.h>
 615 # define xalloca(size)      (alloca(size))
 616 # define xalloca_free(p)    do {} while (0)
 617 #else
 618 # define xalloca(size)      (xmalloc(size))
 619 # define xalloca_free(p)    (free(p))
 620 #endif
 621 extern char *xstrdup(const char *str);
 622 extern void *xmalloc(size_t size);
 623 extern void *xmallocz(size_t size);
 624 extern void *xmallocz_gently(size_t size);
 625 extern void *xmemdupz(const void *data, size_t len);
 626 extern char *xstrndup(const char *str, size_t len);
 627 extern void *xrealloc(void *ptr, size_t size);
 628 extern void *xcalloc(size_t nmemb, size_t size);
 629 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 630 extern ssize_t xread(int fd, void *buf, size_t len);
 631 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 632 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 633 extern int xdup(int fd);
 634 extern FILE *xfdopen(int fd, const char *mode);
 635 extern int xmkstemp(char *template);
 636 extern int xmkstemp_mode(char *template, int mode);
 637 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 638 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 639 extern char *xgetcwd(void);
 640
 641 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 642
 643 static inline size_t xsize_t(off_t len)
 644 {
 645         if (len > (size_t) len)
 646                 die("Cannot handle files this big");
 647         return (size_t)len;
 648 }
 649
 650 /* in ctype.c, for kwset users */
 651 extern const char tolower_trans_tbl[256];
 652
 653 /* Sane ctype - no locale, and works with signed chars */
 654 #undef isascii
 655 #undef isspace
 656 #undef isdigit
 657 #undef isalpha
 658 #undef isalnum
 659 #undef isprint
 660 #undef islower
 661 #undef isupper
 662 #undef tolower
 663 #undef toupper
 664 #undef iscntrl
 665 #undef ispunct
 666 #undef isxdigit
 667
 668 extern const unsigned char sane_ctype[256];
 669 #define GIT_SPACE 0x01
 670 #define GIT_DIGIT 0x02
 671 #define GIT_ALPHA 0x04
 672 #define GIT_GLOB_SPECIAL 0x08
 673 #define GIT_REGEX_SPECIAL 0x10
 674 #define GIT_PATHSPEC_MAGIC 0x20
 675 #define GIT_CNTRL 0x40
 676 #define GIT_PUNCT 0x80
 677 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 678 #define isascii(x) (((x) & ~0x7f) == 0)
 679 #define isspace(x) sane_istest(x,GIT_SPACE)
 680 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 681 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 682 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 683 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 684 #define islower(x) sane_iscase(x, 1)
 685 #define isupper(x) sane_iscase(x, 0)
 686 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 687 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 688 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 689 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 690                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 691 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 692 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 693 #define toupper(x) sane_case((unsigned char)(x), 0)
 694 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 695
 696 static inline int sane_case(int x, int high)
 697 {
 698         if (sane_istest(x, GIT_ALPHA))
 699                 x = (x & ~0x20) | high;
 700         return x;
 701 }
 702
 703 static inline int sane_iscase(int x, int is_lower)
 704 {
 705         if (!sane_istest(x, GIT_ALPHA))
 706                 return 0;
 707
 708         if (is_lower)
 709                 return (x & 0x20) != 0;
 710         else
 711                 return (x & 0x20) == 0;
 712 }
 713
 714 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 715 {
 716         unsigned long ul;
 717         char *p;
 718
 719         errno = 0;
 720         ul = strtoul(s, &p, base);
 721         if (errno || *p || p == s || (unsigned int) ul != ul)
 722                 return -1;
 723         *result = ul;
 724         return 0;
 725 }
 726
 727 static inline int strtol_i(char const *s, int base, int *result)
 728 {
 729         long ul;
 730         char *p;
 731
 732         errno = 0;
 733         ul = strtol(s, &p, base);
 734         if (errno || *p || p == s || (int) ul != ul)
 735                 return -1;
 736         *result = ul;
 737         return 0;
 738 }
 739
 740 #ifdef INTERNAL_QSORT
 741 void git_qsort(void *base, size_t nmemb, size_t size,
 742                int(*compar)(const void *, const void *));
 743 #define qsort git_qsort
 744 #endif
 745
 746 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 747 # define FORCE_DIR_SET_GID S_ISGID
 748 #else
 749 # define FORCE_DIR_SET_GID 0
 750 #endif
 751
 752 #ifdef NO_NSEC
 753 #undef USE_NSEC
 754 #define ST_CTIME_NSEC(st) 0
 755 #define ST_MTIME_NSEC(st) 0
 756 #else
 757 #ifdef USE_ST_TIMESPEC
 758 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 759 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 760 #else
 761 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 762 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 763 #endif
 764 #endif
 765
 766 #ifdef UNRELIABLE_FSTAT
 767 #define fstat_is_reliable() 0
 768 #else
 769 #define fstat_is_reliable() 1
 770 #endif
 771
 772 #ifndef va_copy
 773 /*
 774  * Since an obvious implementation of va_list would be to make it a
 775  * pointer into the stack frame, a simple assignment will work on
 776  * many systems.  But let's try to be more portable.
 777  */
 778 #ifdef __va_copy
 779 #define va_copy(dst, src) __va_copy(dst, src)
 780 #else
 781 #define va_copy(dst, src) ((dst) = (src))
 782 #endif
 783 #endif
 784
 785 #if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 786 #define HAVE_VARIADIC_MACROS 1
 787 #endif
 788
 789 /*
 790  * Preserves errno, prints a message, but gives no warning for ENOENT.
 791  * Returns 0 on success, which includes trying to unlink an object that does
 792  * not exist.
 793  */
 794 int unlink_or_warn(const char *path);
 795  /*
 796   * Tries to unlink file.  Returns 0 if unlink succeeded
 797   * or the file already didn't exist.  Returns -1 and
 798   * appends a message to err suitable for
 799   * 'error("%s", err->buf)' on error.
 800   */
 801 int unlink_or_msg(const char *file, struct strbuf *err);
 802 /*
 803  * Preserves errno, prints a message, but gives no warning for ENOENT.
 804  * Returns 0 on success, which includes trying to remove a directory that does
 805  * not exist.
 806  */
 807 int rmdir_or_warn(const char *path);
 808 /*
 809  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 810  * the supplied file mode.
 811  */
 812 int remove_or_warn(unsigned int mode, const char *path);
 813
 814 /*
 815  * Call access(2), but warn for any error except "missing file"
 816  * (ENOENT or ENOTDIR).
 817  */
 818 #define ACCESS_EACCES_OK (1U << 0)
 819 int access_or_warn(const char *path, int mode, unsigned flag);
 820 int access_or_die(const char *path, int mode, unsigned flag);
 821
 822 /* Warn on an inaccessible file that ought to be accessible */
 823 void warn_on_inaccessible(const char *path);
 824
 825 /* Get the passwd entry for the UID of the current process. */
 826 struct passwd *xgetpwuid_self(void);
 827
 828 #ifdef GMTIME_UNRELIABLE_ERRORS
 829 struct tm *git_gmtime(const time_t *);
 830 struct tm *git_gmtime_r(const time_t *, struct tm *);
 831 #define gmtime git_gmtime
 832 #define gmtime_r git_gmtime_r
 833 #endif
 834
 835 #endif