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 _NETBSD_SOURCE 1
  86 #define _SGI_SOURCE 1
  87
  88 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  89 # if defined (_MSC_VER) && !defined(_WIN32_WINNT)
  90 #  define _WIN32_WINNT 0x0502
  91 # endif
  92 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  93 #include <winsock2.h>
  94 #include <windows.h>
  95 #define GIT_WINDOWS_NATIVE
  96 #endif
  97
  98 #include <unistd.h>
  99 #include <stdio.h>
 100 #include <sys/stat.h>
 101 #include <fcntl.h>
 102 #include <stddef.h>
 103 #include <stdlib.h>
 104 #include <stdarg.h>
 105 #include <string.h>
 106 #ifdef HAVE_STRINGS_H
 107 #include <strings.h> /* for strcasecmp() */
 108 #endif
 109 #include <errno.h>
 110 #include <limits.h>
 111 #ifdef NEEDS_SYS_PARAM_H
 112 #include <sys/param.h>
 113 #endif
 114 #include <sys/types.h>
 115 #include <dirent.h>
 116 #include <sys/time.h>
 117 #include <time.h>
 118 #include <signal.h>
 119 #include <assert.h>
 120 #include <regex.h>
 121 #include <utime.h>
 122 #include <syslog.h>
 123 #ifndef NO_SYS_POLL_H
 124 #include <sys/poll.h>
 125 #else
 126 #include <poll.h>
 127 #endif
 128
 129 #if defined(__MINGW32__)
 130 /* pull in Windows compatibility stuff */
 131 #include "compat/mingw.h"
 132 #elif defined(_MSC_VER)
 133 #include "compat/msvc.h"
 134 #else
 135 #include <sys/wait.h>
 136 #include <sys/resource.h>
 137 #include <sys/socket.h>
 138 #include <sys/ioctl.h>
 139 #include <termios.h>
 140 #ifndef NO_SYS_SELECT_H
 141 #include <sys/select.h>
 142 #endif
 143 #include <netinet/in.h>
 144 #include <netinet/tcp.h>
 145 #include <arpa/inet.h>
 146 #include <netdb.h>
 147 #include <pwd.h>
 148 #include <sys/un.h>
 149 #ifndef NO_INTTYPES_H
 150 #include <inttypes.h>
 151 #else
 152 #include <stdint.h>
 153 #endif
 154 #ifdef NO_INTPTR_T
 155 /*
 156  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 157  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 158  * while on IP16 and IP16L32 it is "int" (resp. "short")
 159  * Size needs to match (or exceed) 'sizeof(void *)'.
 160  * We can't take "long long" here as not everybody has it.
 161  */
 162 typedef long intptr_t;
 163 typedef unsigned long uintptr_t;
 164 #endif
 165 #if defined(__CYGWIN__)
 166 #undef _XOPEN_SOURCE
 167 #include <grp.h>
 168 #define _XOPEN_SOURCE 600
 169 #else
 170 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 171 #include <grp.h>
 172 #define _ALL_SOURCE 1
 173 #endif
 174 #endif
 175
 176 /* used on Mac OS X */
 177 #ifdef PRECOMPOSE_UNICODE
 178 #include "compat/precompose_utf8.h"
 179 #else
 180 #define precompose_str(in,i_nfd2nfc)
 181 #define precompose_argv(c,v)
 182 #define probe_utf8_pathname_composition(a,b)
 183 #endif
 184
 185 #ifdef MKDIR_WO_TRAILING_SLASH
 186 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 187 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 188 #endif
 189
 190 #ifdef NO_STRUCT_ITIMERVAL
 191 struct itimerval {
 192         struct timeval it_interval;
 193         struct timeval it_value;
 194 }
 195 #endif
 196
 197 #ifdef NO_SETITIMER
 198 #define setitimer(which,value,ovalue)
 199 #endif
 200
 201 #ifndef NO_LIBGEN_H
 202 #include <libgen.h>
 203 #else
 204 #define basename gitbasename
 205 extern char *gitbasename(char *);
 206 #endif
 207
 208 #ifndef NO_ICONV
 209 #include <iconv.h>
 210 #endif
 211
 212 #ifndef NO_OPENSSL
 213 #include <openssl/ssl.h>
 214 #include <openssl/err.h>
 215 #endif
 216
 217 /* On most systems <netdb.h> would have given us this, but
 218  * not on some systems (e.g. z/OS).
 219  */
 220 #ifndef NI_MAXHOST
 221 #define NI_MAXHOST 1025
 222 #endif
 223
 224 #ifndef NI_MAXSERV
 225 #define NI_MAXSERV 32
 226 #endif
 227
 228 /* On most systems <limits.h> would have given us this, but
 229  * not on some systems (e.g. GNU/Hurd).
 230  */
 231 #ifndef PATH_MAX
 232 #define PATH_MAX 4096
 233 #endif
 234
 235 #ifndef PRIuMAX
 236 #define PRIuMAX "llu"
 237 #endif
 238
 239 #ifndef PRIu32
 240 #define PRIu32 "u"
 241 #endif
 242
 243 #ifndef PRIx32
 244 #define PRIx32 "x"
 245 #endif
 246
 247 #ifndef PRIo32
 248 #define PRIo32 "o"
 249 #endif
 250
 251 #ifndef PATH_SEP
 252 #define PATH_SEP ':'
 253 #endif
 254
 255 #ifdef HAVE_PATHS_H
 256 #include <paths.h>
 257 #endif
 258 #ifndef _PATH_DEFPATH
 259 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 260 #endif
 261
 262 #ifndef STRIP_EXTENSION
 263 #define STRIP_EXTENSION ""
 264 #endif
 265
 266 #ifndef has_dos_drive_prefix
 267 #define has_dos_drive_prefix(path) 0
 268 #endif
 269
 270 #ifndef offset_1st_component
 271 #define offset_1st_component(path) (is_dir_sep((path)[0]))
 272 #endif
 273
 274 #ifndef is_dir_sep
 275 #define is_dir_sep(c) ((c) == '/')
 276 #endif
 277
 278 #ifndef find_last_dir_sep
 279 #define find_last_dir_sep(path) strrchr(path, '/')
 280 #endif
 281
 282 #if defined(__HP_cc) && (__HP_cc >= 61000)
 283 #define NORETURN __attribute__((noreturn))
 284 #define NORETURN_PTR
 285 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 286 #define NORETURN __attribute__((__noreturn__))
 287 #define NORETURN_PTR __attribute__((__noreturn__))
 288 #elif defined(_MSC_VER)
 289 #define NORETURN __declspec(noreturn)
 290 #define NORETURN_PTR
 291 #else
 292 #define NORETURN
 293 #define NORETURN_PTR
 294 #ifndef __GNUC__
 295 #ifndef __attribute__
 296 #define __attribute__(x)
 297 #endif
 298 #endif
 299 #endif
 300
 301 /* The sentinel attribute is valid from gcc version 4.0 */
 302 #if defined(__GNUC__) && (__GNUC__ >= 4)
 303 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 304 #else
 305 #define LAST_ARG_MUST_BE_NULL
 306 #endif
 307
 308 #include "compat/bswap.h"
 309
 310 #include "wildmatch.h"
 311
 312 /* General helper functions */
 313 extern void vreportf(const char *prefix, const char *err, va_list params);
 314 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 315 extern NORETURN void usage(const char *err);
 316 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 317 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 318 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 319 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 320 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 321
 322 #ifndef NO_OPENSSL
 323 #ifdef APPLE_COMMON_CRYPTO
 324 #include "compat/apple-common-crypto.h"
 325 #else
 326 #include <openssl/evp.h>
 327 #include <openssl/hmac.h>
 328 #endif /* APPLE_COMMON_CRYPTO */
 329 #include <openssl/x509v3.h>
 330 #endif /* NO_OPENSSL */
 331
 332 /*
 333  * Let callers be aware of the constant return value; this can help
 334  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 335  * because some compilers may not support variadic macros. Since we're only
 336  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 337  * using the function as usual.
 338  */
 339 #if defined(__GNUC__)
 340 static inline int const_error(void)
 341 {
 342         return -1;
 343 }
 344 #define error(...) (error(__VA_ARGS__), const_error())
 345 #endif
 346
 347 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 348 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 349 extern void set_die_is_recursing_routine(int (*routine)(void));
 350
 351 extern int starts_with(const char *str, const char *prefix);
 352 extern int ends_with(const char *str, const char *suffix);
 353
 354 static inline const char *skip_prefix(const char *str, const char *prefix)
 355 {
 356         do {
 357                 if (!*prefix)
 358                         return str;
 359         } while (*str++ == *prefix++);
 360         return NULL;
 361 }
 362
 363 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 364
 365 #ifndef PROT_READ
 366 #define PROT_READ 1
 367 #define PROT_WRITE 2
 368 #define MAP_PRIVATE 1
 369 #endif
 370
 371 #define mmap git_mmap
 372 #define munmap git_munmap
 373 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 374 extern int git_munmap(void *start, size_t length);
 375
 376 #else /* NO_MMAP || USE_WIN32_MMAP */
 377
 378 #include <sys/mman.h>
 379
 380 #endif /* NO_MMAP || USE_WIN32_MMAP */
 381
 382 #ifdef NO_MMAP
 383
 384 /* This value must be multiple of (pagesize * 2) */
 385 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 386
 387 #else /* NO_MMAP */
 388
 389 /* This value must be multiple of (pagesize * 2) */
 390 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 391         (sizeof(void*) >= 8 \
 392                 ?  1 * 1024 * 1024 * 1024 \
 393                 : 32 * 1024 * 1024)
 394
 395 #endif /* NO_MMAP */
 396
 397 #ifndef MAP_FAILED
 398 #define MAP_FAILED ((void *)-1)
 399 #endif
 400
 401 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 402 #define on_disk_bytes(st) ((st).st_size)
 403 #else
 404 #define on_disk_bytes(st) ((st).st_blocks * 512)
 405 #endif
 406
 407 #define DEFAULT_PACKED_GIT_LIMIT \
 408         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 409
 410 #ifdef NO_PREAD
 411 #define pread git_pread
 412 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 413 #endif
 414 /*
 415  * Forward decl that will remind us if its twin in cache.h changes.
 416  * This function is used in compat/pread.c.  But we can't include
 417  * cache.h there.
 418  */
 419 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 420
 421 #ifdef NO_SETENV
 422 #define setenv gitsetenv
 423 extern int gitsetenv(const char *, const char *, int);
 424 #endif
 425
 426 #ifdef NO_MKDTEMP
 427 #define mkdtemp gitmkdtemp
 428 extern char *gitmkdtemp(char *);
 429 #endif
 430
 431 #ifdef NO_MKSTEMPS
 432 #define mkstemps gitmkstemps
 433 extern int gitmkstemps(char *, int);
 434 #endif
 435
 436 #ifdef NO_UNSETENV
 437 #define unsetenv gitunsetenv
 438 extern void gitunsetenv(const char *);
 439 #endif
 440
 441 #ifdef NO_STRCASESTR
 442 #define strcasestr gitstrcasestr
 443 extern char *gitstrcasestr(const char *haystack, const char *needle);
 444 #endif
 445
 446 #ifdef NO_STRLCPY
 447 #define strlcpy gitstrlcpy
 448 extern size_t gitstrlcpy(char *, const char *, size_t);
 449 #endif
 450
 451 #ifdef NO_STRTOUMAX
 452 #define strtoumax gitstrtoumax
 453 extern uintmax_t gitstrtoumax(const char *, char **, int);
 454 #define strtoimax gitstrtoimax
 455 extern intmax_t gitstrtoimax(const char *, char **, int);
 456 #endif
 457
 458 #ifdef NO_HSTRERROR
 459 #define hstrerror githstrerror
 460 extern const char *githstrerror(int herror);
 461 #endif
 462
 463 #ifdef NO_MEMMEM
 464 #define memmem gitmemmem
 465 void *gitmemmem(const void *haystack, size_t haystacklen,
 466                 const void *needle, size_t needlelen);
 467 #endif
 468
 469 #ifdef NO_GETPAGESIZE
 470 #define getpagesize() sysconf(_SC_PAGESIZE)
 471 #endif
 472
 473 #ifdef FREAD_READS_DIRECTORIES
 474 #ifdef fopen
 475 #undef fopen
 476 #endif
 477 #define fopen(a,b) git_fopen(a,b)
 478 extern FILE *git_fopen(const char*, const char*);
 479 #endif
 480
 481 #ifdef SNPRINTF_RETURNS_BOGUS
 482 #ifdef snprintf
 483 #undef snprintf
 484 #endif
 485 #define snprintf git_snprintf
 486 extern int git_snprintf(char *str, size_t maxsize,
 487                         const char *format, ...);
 488 #ifdef vsnprintf
 489 #undef vsnprintf
 490 #endif
 491 #define vsnprintf git_vsnprintf
 492 extern int git_vsnprintf(char *str, size_t maxsize,
 493                          const char *format, va_list ap);
 494 #endif
 495
 496 #ifdef __GLIBC_PREREQ
 497 #if __GLIBC_PREREQ(2, 1)
 498 #define HAVE_STRCHRNUL
 499 #define HAVE_MEMPCPY
 500 #endif
 501 #endif
 502
 503 #ifndef HAVE_STRCHRNUL
 504 #define strchrnul gitstrchrnul
 505 static inline char *gitstrchrnul(const char *s, int c)
 506 {
 507         while (*s && *s != c)
 508                 s++;
 509         return (char *)s;
 510 }
 511 #endif
 512
 513 #ifndef HAVE_MEMPCPY
 514 #define mempcpy gitmempcpy
 515 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 516 {
 517         return (char *)memcpy(dest, src, n) + n;
 518 }
 519 #endif
 520
 521 #ifdef NO_INET_PTON
 522 int inet_pton(int af, const char *src, void *dst);
 523 #endif
 524
 525 #ifdef NO_INET_NTOP
 526 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 527 #endif
 528
 529 extern void release_pack_memory(size_t);
 530
 531 typedef void (*try_to_free_t)(size_t);
 532 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 533
 534 #ifdef HAVE_ALLOCA_H
 535 # include <alloca.h>
 536 # define xalloca(size)      (alloca(size))
 537 # define xalloca_free(p)    do {} while (0)
 538 #else
 539 # define xalloca(size)      (xmalloc(size))
 540 # define xalloca_free(p)    (free(p))
 541 #endif
 542 extern char *xstrdup(const char *str);
 543 extern void *xmalloc(size_t size);
 544 extern void *xmallocz(size_t size);
 545 extern void *xmemdupz(const void *data, size_t len);
 546 extern char *xstrndup(const char *str, size_t len);
 547 extern void *xrealloc(void *ptr, size_t size);
 548 extern void *xcalloc(size_t nmemb, size_t size);
 549 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 550 extern ssize_t xread(int fd, void *buf, size_t len);
 551 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 552 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 553 extern int xdup(int fd);
 554 extern FILE *xfdopen(int fd, const char *mode);
 555 extern int xmkstemp(char *template);
 556 extern int xmkstemp_mode(char *template, int mode);
 557 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 558 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 559
 560 static inline size_t xsize_t(off_t len)
 561 {
 562         if (len > (size_t) len)
 563                 die("Cannot handle files this big");
 564         return (size_t)len;
 565 }
 566
 567 static inline int has_extension(const char *filename, const char *ext)
 568 {
 569         size_t len = strlen(filename);
 570         size_t extlen = strlen(ext);
 571         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 572 }
 573
 574 /* in ctype.c, for kwset users */
 575 extern const char tolower_trans_tbl[256];
 576
 577 /* Sane ctype - no locale, and works with signed chars */
 578 #undef isascii
 579 #undef isspace
 580 #undef isdigit
 581 #undef isalpha
 582 #undef isalnum
 583 #undef isprint
 584 #undef islower
 585 #undef isupper
 586 #undef tolower
 587 #undef toupper
 588 #undef iscntrl
 589 #undef ispunct
 590 #undef isxdigit
 591
 592 extern const unsigned char sane_ctype[256];
 593 #define GIT_SPACE 0x01
 594 #define GIT_DIGIT 0x02
 595 #define GIT_ALPHA 0x04
 596 #define GIT_GLOB_SPECIAL 0x08
 597 #define GIT_REGEX_SPECIAL 0x10
 598 #define GIT_PATHSPEC_MAGIC 0x20
 599 #define GIT_CNTRL 0x40
 600 #define GIT_PUNCT 0x80
 601 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 602 #define isascii(x) (((x) & ~0x7f) == 0)
 603 #define isspace(x) sane_istest(x,GIT_SPACE)
 604 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 605 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 606 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 607 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 608 #define islower(x) sane_iscase(x, 1)
 609 #define isupper(x) sane_iscase(x, 0)
 610 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 611 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 612 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 613 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 614                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 615 #define isxdigit(x) (hexval_table[x] != -1)
 616 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 617 #define toupper(x) sane_case((unsigned char)(x), 0)
 618 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 619
 620 static inline int sane_case(int x, int high)
 621 {
 622         if (sane_istest(x, GIT_ALPHA))
 623                 x = (x & ~0x20) | high;
 624         return x;
 625 }
 626
 627 static inline int sane_iscase(int x, int is_lower)
 628 {
 629         if (!sane_istest(x, GIT_ALPHA))
 630                 return 0;
 631
 632         if (is_lower)
 633                 return (x & 0x20) != 0;
 634         else
 635                 return (x & 0x20) == 0;
 636 }
 637
 638 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 639 {
 640         unsigned long ul;
 641         char *p;
 642
 643         errno = 0;
 644         ul = strtoul(s, &p, base);
 645         if (errno || *p || p == s || (unsigned int) ul != ul)
 646                 return -1;
 647         *result = ul;
 648         return 0;
 649 }
 650
 651 static inline int strtol_i(char const *s, int base, int *result)
 652 {
 653         long ul;
 654         char *p;
 655
 656         errno = 0;
 657         ul = strtol(s, &p, base);
 658         if (errno || *p || p == s || (int) ul != ul)
 659                 return -1;
 660         *result = ul;
 661         return 0;
 662 }
 663
 664 #ifdef INTERNAL_QSORT
 665 void git_qsort(void *base, size_t nmemb, size_t size,
 666                int(*compar)(const void *, const void *));
 667 #define qsort git_qsort
 668 #endif
 669
 670 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 671 # define FORCE_DIR_SET_GID S_ISGID
 672 #else
 673 # define FORCE_DIR_SET_GID 0
 674 #endif
 675
 676 #ifdef NO_NSEC
 677 #undef USE_NSEC
 678 #define ST_CTIME_NSEC(st) 0
 679 #define ST_MTIME_NSEC(st) 0
 680 #else
 681 #ifdef USE_ST_TIMESPEC
 682 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 683 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 684 #else
 685 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 686 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 687 #endif
 688 #endif
 689
 690 #if defined(__GNUC__) && defined(__x86_64__)
 691 #include <emmintrin.h>
 692 /*
 693  * This is the system memory page size; it's used so that we can read
 694  * outside the bounds of an allocation without segfaulting.
 695  */
 696 #ifndef PAGE_SIZE
 697 #define PAGE_SIZE 4096
 698 #endif
 699 #endif
 700
 701 #ifdef UNRELIABLE_FSTAT
 702 #define fstat_is_reliable() 0
 703 #else
 704 #define fstat_is_reliable() 1
 705 #endif
 706
 707 #ifndef va_copy
 708 /*
 709  * Since an obvious implementation of va_list would be to make it a
 710  * pointer into the stack frame, a simple assignment will work on
 711  * many systems.  But let's try to be more portable.
 712  */
 713 #ifdef __va_copy
 714 #define va_copy(dst, src) __va_copy(dst, src)
 715 #else
 716 #define va_copy(dst, src) ((dst) = (src))
 717 #endif
 718 #endif
 719
 720 /*
 721  * Preserves errno, prints a message, but gives no warning for ENOENT.
 722  * Always returns the return value of unlink(2).
 723  */
 724 int unlink_or_warn(const char *path);
 725 /*
 726  * Likewise for rmdir(2).
 727  */
 728 int rmdir_or_warn(const char *path);
 729 /*
 730  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 731  * the supplied file mode.
 732  */
 733 int remove_or_warn(unsigned int mode, const char *path);
 734
 735 /*
 736  * Call access(2), but warn for any error except "missing file"
 737  * (ENOENT or ENOTDIR).
 738  */
 739 #define ACCESS_EACCES_OK (1U << 0)
 740 int access_or_warn(const char *path, int mode, unsigned flag);
 741 int access_or_die(const char *path, int mode, unsigned flag);
 742
 743 /* Warn on an inaccessible file that ought to be accessible */
 744 void warn_on_inaccessible(const char *path);
 745
 746 /* Get the passwd entry for the UID of the current process. */
 747 struct passwd *xgetpwuid_self(void);
 748
 749 #ifdef GMTIME_UNRELIABLE_ERRORS
 750 struct tm *git_gmtime(const time_t *);
 751 struct tm *git_gmtime_r(const time_t *, struct tm *);
 752 #define gmtime git_gmtime
 753 #define gmtime_r git_gmtime_r
 754 #endif
 755
 756 #endif