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 /* default is not to pass type - mingw needs this */
  89 #define symlink_with_type(a,b,c) symlink((a),(b))
  90
  91 /* Used for 'Target Type' Parameter for symlink_with_type */
  92 enum git_target_type {
  93         GIT_TARGET_UNKNOWN,
  94         GIT_TARGET_ISFILE,
  95         GIT_TARGET_ISDIR
  96 };
  97
  98 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  99 # if defined (_MSC_VER) && !defined(_WIN32_WINNT)
 100 #  define _WIN32_WINNT 0x0502
 101 # endif
 102 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 103 #include <winsock2.h>
 104 #include <windows.h>
 105 #define GIT_WINDOWS_NATIVE
 106 #endif
 107
 108 #include <unistd.h>
 109 #include <stdio.h>
 110 #include <sys/stat.h>
 111 #include <fcntl.h>
 112 #include <stddef.h>
 113 #include <stdlib.h>
 114 #include <stdarg.h>
 115 #include <string.h>
 116 #ifdef HAVE_STRINGS_H
 117 #include <strings.h> /* for strcasecmp() */
 118 #endif
 119 #include <errno.h>
 120 #include <limits.h>
 121 #ifdef NEEDS_SYS_PARAM_H
 122 #include <sys/param.h>
 123 #endif
 124 #include <sys/types.h>
 125 #include <dirent.h>
 126 #include <sys/time.h>
 127 #include <time.h>
 128 #include <signal.h>
 129 #include <assert.h>
 130 #include <regex.h>
 131 #include <utime.h>
 132 #include <syslog.h>
 133 #ifndef NO_SYS_POLL_H
 134 #include <sys/poll.h>
 135 #else
 136 #include <poll.h>
 137 #endif
 138
 139 #if defined(__MINGW32__)
 140 /* pull in Windows compatibility stuff */
 141 #include "compat/mingw.h"
 142 #include "compat/win32/fscache.h"
 143 #elif defined(_MSC_VER)
 144 #include "compat/msvc.h"
 145 #include "compat/win32/fscache.h"
 146 #else
 147 #include <sys/wait.h>
 148 #include <sys/resource.h>
 149 #include <sys/socket.h>
 150 #include <sys/ioctl.h>
 151 #include <termios.h>
 152 #ifndef NO_SYS_SELECT_H
 153 #include <sys/select.h>
 154 #endif
 155 #include <netinet/in.h>
 156 #include <netinet/tcp.h>
 157 #include <arpa/inet.h>
 158 #include <netdb.h>
 159 #include <pwd.h>
 160 #include <sys/un.h>
 161 #ifndef NO_INTTYPES_H
 162 #include <inttypes.h>
 163 #else
 164 #include <stdint.h>
 165 #endif
 166 #ifdef NO_INTPTR_T
 167 /*
 168  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 169  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 170  * while on IP16 and IP16L32 it is "int" (resp. "short")
 171  * Size needs to match (or exceed) 'sizeof(void *)'.
 172  * We can't take "long long" here as not everybody has it.
 173  */
 174 typedef long intptr_t;
 175 typedef unsigned long uintptr_t;
 176 #endif
 177 #if defined(__CYGWIN__)
 178 #undef _XOPEN_SOURCE
 179 #include <grp.h>
 180 #define _XOPEN_SOURCE 600
 181 #else
 182 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 183 #include <grp.h>
 184 #define _ALL_SOURCE 1
 185 #endif
 186 #endif
 187
 188 /* used on Mac OS X */
 189 #ifdef PRECOMPOSE_UNICODE
 190 #include "compat/precompose_utf8.h"
 191 #else
 192 #define precompose_str(in,i_nfd2nfc)
 193 #define precompose_argv(c,v)
 194 #define probe_utf8_pathname_composition(a,b)
 195 #endif
 196
 197 #ifdef MKDIR_WO_TRAILING_SLASH
 198 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 199 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 200 #endif
 201
 202 #ifdef NO_STRUCT_ITIMERVAL
 203 struct itimerval {
 204         struct timeval it_interval;
 205         struct timeval it_value;
 206 }
 207 #endif
 208
 209 #ifdef NO_SETITIMER
 210 #define setitimer(which,value,ovalue)
 211 #endif
 212
 213 #ifndef NO_LIBGEN_H
 214 #include <libgen.h>
 215 #else
 216 #define basename gitbasename
 217 extern char *gitbasename(char *);
 218 #endif
 219
 220 #ifndef NO_ICONV
 221 #include <iconv.h>
 222 #endif
 223
 224 #ifndef NO_OPENSSL
 225 #include <openssl/ssl.h>
 226 #include <openssl/err.h>
 227 #endif
 228
 229 /* On most systems <netdb.h> would have given us this, but
 230  * not on some systems (e.g. z/OS).
 231  */
 232 #ifndef NI_MAXHOST
 233 #define NI_MAXHOST 1025
 234 #endif
 235
 236 #ifndef NI_MAXSERV
 237 #define NI_MAXSERV 32
 238 #endif
 239
 240 /* On most systems <limits.h> would have given us this, but
 241  * not on some systems (e.g. GNU/Hurd).
 242  */
 243 #ifndef PATH_MAX
 244 #define PATH_MAX 4096
 245 #endif
 246
 247 #ifndef PRIuMAX
 248 #define PRIuMAX "llu"
 249 #endif
 250
 251 #ifndef PRIu32
 252 #define PRIu32 "u"
 253 #endif
 254
 255 #ifndef PRIx32
 256 #define PRIx32 "x"
 257 #endif
 258
 259 #ifndef PRIo32
 260 #define PRIo32 "o"
 261 #endif
 262
 263 #ifndef PATH_SEP
 264 #define PATH_SEP ':'
 265 #endif
 266
 267 #ifdef HAVE_PATHS_H
 268 #include <paths.h>
 269 #endif
 270 #ifndef _PATH_DEFPATH
 271 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 272 #endif
 273
 274 #ifndef STRIP_EXTENSION
 275 #define STRIP_EXTENSION ""
 276 #endif
 277
 278 #ifndef has_dos_drive_prefix
 279 #define has_dos_drive_prefix(path) 0
 280 #endif
 281
 282 #ifndef offset_1st_component
 283 #define offset_1st_component(path) (is_dir_sep((path)[0]))
 284 #endif
 285
 286 #ifndef is_dir_sep
 287 #define is_dir_sep(c) ((c) == '/')
 288 #endif
 289
 290 #ifndef find_last_dir_sep
 291 #define find_last_dir_sep(path) strrchr(path, '/')
 292 #endif
 293
 294 #if defined(__HP_cc) && (__HP_cc >= 61000)
 295 #define NORETURN __attribute__((noreturn))
 296 #define NORETURN_PTR
 297 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 298 #define NORETURN __attribute__((__noreturn__))
 299 #define NORETURN_PTR __attribute__((__noreturn__))
 300 #elif defined(_MSC_VER)
 301 #define NORETURN __declspec(noreturn)
 302 #define NORETURN_PTR
 303 #else
 304 #define NORETURN
 305 #define NORETURN_PTR
 306 #ifndef __attribute__
 307 #define __attribute__(x)
 308 #endif
 309 #endif
 310
 311 /* The sentinel attribute is valid from gcc version 4.0 */
 312 #if defined(__GNUC__) && (__GNUC__ >= 4)
 313 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 314 #else
 315 #define LAST_ARG_MUST_BE_NULL
 316 #endif
 317
 318 #include "compat/bswap.h"
 319
 320 #include "wildmatch.h"
 321
 322 /* General helper functions */
 323 extern void vreportf(const char *prefix, const char *err, va_list params);
 324 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 325 extern NORETURN void usage(const char *err);
 326 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 327 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 328 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 329 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 330 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 331
 332 #ifndef NO_OPENSSL
 333 #ifdef APPLE_COMMON_CRYPTO
 334 #include "compat/apple-common-crypto.h"
 335 #else
 336 #include <openssl/evp.h>
 337 #include <openssl/hmac.h>
 338 #endif /* APPLE_COMMON_CRYPTO */
 339 #include <openssl/x509v3.h>
 340 #endif /* NO_OPENSSL */
 341
 342 /*
 343  * Let callers be aware of the constant return value; this can help
 344  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 345  * because some compilers may not support variadic macros. Since we're only
 346  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 347  * using the function as usual.
 348  */
 349 #if defined(__GNUC__) && ! defined(__clang__)
 350 #define error(...) (error(__VA_ARGS__), -1)
 351 #endif
 352
 353 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 354 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 355 extern void set_die_is_recursing_routine(int (*routine)(void));
 356
 357 extern int starts_with(const char *str, const char *prefix);
 358 extern int ends_with(const char *str, const char *suffix);
 359
 360 static inline const char *skip_prefix(const char *str, const char *prefix)
 361 {
 362         do {
 363                 if (!*prefix)
 364                         return str;
 365         } while (*str++ == *prefix++);
 366         return NULL;
 367 }
 368
 369 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 370
 371 #ifndef PROT_READ
 372 #define PROT_READ 1
 373 #define PROT_WRITE 2
 374 #define MAP_PRIVATE 1
 375 #endif
 376
 377 #define mmap git_mmap
 378 #define munmap git_munmap
 379 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 380 extern int git_munmap(void *start, size_t length);
 381
 382 #else /* NO_MMAP || USE_WIN32_MMAP */
 383
 384 #include <sys/mman.h>
 385
 386 #endif /* NO_MMAP || USE_WIN32_MMAP */
 387
 388 #ifdef NO_MMAP
 389
 390 /* This value must be multiple of (pagesize * 2) */
 391 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 392
 393 #else /* NO_MMAP */
 394
 395 /* This value must be multiple of (pagesize * 2) */
 396 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 397         (sizeof(void*) >= 8 \
 398                 ?  1 * 1024 * 1024 * 1024 \
 399                 : 32 * 1024 * 1024)
 400
 401 #endif /* NO_MMAP */
 402
 403 #ifndef MAP_FAILED
 404 #define MAP_FAILED ((void *)-1)
 405 #endif
 406
 407 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 408 #define on_disk_bytes(st) ((st).st_size)
 409 #else
 410 #define on_disk_bytes(st) ((st).st_blocks * 512)
 411 #endif
 412
 413 #define DEFAULT_PACKED_GIT_LIMIT \
 414         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 415
 416 #ifdef NO_PREAD
 417 #define pread git_pread
 418 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 419 #endif
 420 /*
 421  * Forward decl that will remind us if its twin in cache.h changes.
 422  * This function is used in compat/pread.c.  But we can't include
 423  * cache.h there.
 424  */
 425 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 426
 427 #ifdef NO_SETENV
 428 #define setenv gitsetenv
 429 extern int gitsetenv(const char *, const char *, int);
 430 #endif
 431
 432 #ifdef NO_MKDTEMP
 433 #define mkdtemp gitmkdtemp
 434 extern char *gitmkdtemp(char *);
 435 #endif
 436
 437 #ifdef NO_MKSTEMPS
 438 #define mkstemps gitmkstemps
 439 extern int gitmkstemps(char *, int);
 440 #endif
 441
 442 #ifdef NO_UNSETENV
 443 #define unsetenv gitunsetenv
 444 extern void gitunsetenv(const char *);
 445 #endif
 446
 447 #ifdef NO_STRCASESTR
 448 #define strcasestr gitstrcasestr
 449 extern char *gitstrcasestr(const char *haystack, const char *needle);
 450 #endif
 451
 452 #ifdef NO_STRLCPY
 453 #define strlcpy gitstrlcpy
 454 extern size_t gitstrlcpy(char *, const char *, size_t);
 455 #endif
 456
 457 #ifdef NO_STRTOUMAX
 458 #define strtoumax gitstrtoumax
 459 extern uintmax_t gitstrtoumax(const char *, char **, int);
 460 #define strtoimax gitstrtoimax
 461 extern intmax_t gitstrtoimax(const char *, char **, int);
 462 #endif
 463
 464 #ifdef NO_HSTRERROR
 465 #define hstrerror githstrerror
 466 extern const char *githstrerror(int herror);
 467 #endif
 468
 469 #ifdef NO_MEMMEM
 470 #define memmem gitmemmem
 471 void *gitmemmem(const void *haystack, size_t haystacklen,
 472                 const void *needle, size_t needlelen);
 473 #endif
 474
 475 #ifdef NO_GETPAGESIZE
 476 #define getpagesize() sysconf(_SC_PAGESIZE)
 477 #endif
 478
 479 #ifdef FREAD_READS_DIRECTORIES
 480 #ifdef fopen
 481 #undef fopen
 482 #endif
 483 #define fopen(a,b) git_fopen(a,b)
 484 extern FILE *git_fopen(const char*, const char*);
 485 #endif
 486
 487 #ifdef SNPRINTF_RETURNS_BOGUS
 488 #ifdef snprintf
 489 #undef snprintf
 490 #endif
 491 #define snprintf git_snprintf
 492 extern int git_snprintf(char *str, size_t maxsize,
 493                         const char *format, ...);
 494 #ifdef vsnprintf
 495 #undef vsnprintf
 496 #endif
 497 #define vsnprintf git_vsnprintf
 498 extern int git_vsnprintf(char *str, size_t maxsize,
 499                          const char *format, va_list ap);
 500 #endif
 501
 502 #ifdef __GLIBC_PREREQ
 503 #if __GLIBC_PREREQ(2, 1)
 504 #define HAVE_STRCHRNUL
 505 #define HAVE_MEMPCPY
 506 #endif
 507 #endif
 508
 509 #ifndef HAVE_STRCHRNUL
 510 #define strchrnul gitstrchrnul
 511 static inline char *gitstrchrnul(const char *s, int c)
 512 {
 513         while (*s && *s != c)
 514                 s++;
 515         return (char *)s;
 516 }
 517 #endif
 518
 519 #ifndef HAVE_MEMPCPY
 520 #define mempcpy gitmempcpy
 521 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 522 {
 523         return (char *)memcpy(dest, src, n) + n;
 524 }
 525 #endif
 526
 527 #ifdef NO_INET_PTON
 528 int inet_pton(int af, const char *src, void *dst);
 529 #endif
 530
 531 #ifdef NO_INET_NTOP
 532 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 533 #endif
 534
 535 extern void release_pack_memory(size_t);
 536
 537 typedef void (*try_to_free_t)(size_t);
 538 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 539
 540 extern char *xstrdup(const char *str);
 541 extern void *xmalloc(size_t size);
 542 extern void *xmallocz(size_t size);
 543 extern void *xmemdupz(const void *data, size_t len);
 544 extern char *xstrndup(const char *str, size_t len);
 545 extern void *xrealloc(void *ptr, size_t size);
 546 extern void *xcalloc(size_t nmemb, size_t size);
 547 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 548 extern ssize_t xread(int fd, void *buf, size_t len);
 549 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 550 extern int xdup(int fd);
 551 extern FILE *xfdopen(int fd, const char *mode);
 552 extern int xmkstemp(char *template);
 553 extern int xmkstemp_mode(char *template, int mode);
 554 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 555 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 556
 557 static inline size_t xsize_t(off_t len)
 558 {
 559         if (len > (size_t) len)
 560                 die("Cannot handle files this big");
 561         return (size_t)len;
 562 }
 563
 564 static inline int has_extension(const char *filename, const char *ext)
 565 {
 566         size_t len = strlen(filename);
 567         size_t extlen = strlen(ext);
 568         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 569 }
 570
 571 /* in ctype.c, for kwset users */
 572 extern const char tolower_trans_tbl[256];
 573
 574 /* Sane ctype - no locale, and works with signed chars */
 575 #undef isascii
 576 #undef isspace
 577 #undef isdigit
 578 #undef isalpha
 579 #undef isalnum
 580 #undef isprint
 581 #undef islower
 582 #undef isupper
 583 #undef tolower
 584 #undef toupper
 585 #undef iscntrl
 586 #undef ispunct
 587 #undef isxdigit
 588
 589 extern const unsigned char sane_ctype[256];
 590 #define GIT_SPACE 0x01
 591 #define GIT_DIGIT 0x02
 592 #define GIT_ALPHA 0x04
 593 #define GIT_GLOB_SPECIAL 0x08
 594 #define GIT_REGEX_SPECIAL 0x10
 595 #define GIT_PATHSPEC_MAGIC 0x20
 596 #define GIT_CNTRL 0x40
 597 #define GIT_PUNCT 0x80
 598 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 599 #define isascii(x) (((x) & ~0x7f) == 0)
 600 #define isspace(x) sane_istest(x,GIT_SPACE)
 601 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 602 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 603 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 604 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 605 #define islower(x) sane_iscase(x, 1)
 606 #define isupper(x) sane_iscase(x, 0)
 607 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 608 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 609 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 610 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 611                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 612 #define isxdigit(x) (hexval_table[x] != -1)
 613 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 614 #define toupper(x) sane_case((unsigned char)(x), 0)
 615 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 616
 617 static inline int sane_case(int x, int high)
 618 {
 619         if (sane_istest(x, GIT_ALPHA))
 620                 x = (x & ~0x20) | high;
 621         return x;
 622 }
 623
 624 static inline int sane_iscase(int x, int is_lower)
 625 {
 626         if (!sane_istest(x, GIT_ALPHA))
 627                 return 0;
 628
 629         if (is_lower)
 630                 return (x & 0x20) != 0;
 631         else
 632                 return (x & 0x20) == 0;
 633 }
 634
 635 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 636 {
 637         unsigned long ul;
 638         char *p;
 639
 640         errno = 0;
 641         ul = strtoul(s, &p, base);
 642         if (errno || *p || p == s || (unsigned int) ul != ul)
 643                 return -1;
 644         *result = ul;
 645         return 0;
 646 }
 647
 648 static inline int strtol_i(char const *s, int base, int *result)
 649 {
 650         long ul;
 651         char *p;
 652
 653         errno = 0;
 654         ul = strtol(s, &p, base);
 655         if (errno || *p || p == s || (int) ul != ul)
 656                 return -1;
 657         *result = ul;
 658         return 0;
 659 }
 660
 661 #ifdef INTERNAL_QSORT
 662 void git_qsort(void *base, size_t nmemb, size_t size,
 663                int(*compar)(const void *, const void *));
 664 #define qsort git_qsort
 665 #endif
 666
 667 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 668 # define FORCE_DIR_SET_GID S_ISGID
 669 #else
 670 # define FORCE_DIR_SET_GID 0
 671 #endif
 672
 673 #ifdef NO_NSEC
 674 #undef USE_NSEC
 675 #define ST_CTIME_NSEC(st) 0
 676 #define ST_MTIME_NSEC(st) 0
 677 #else
 678 #ifdef USE_ST_TIMESPEC
 679 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 680 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 681 #else
 682 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 683 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 684 #endif
 685 #endif
 686
 687 #ifdef UNRELIABLE_FSTAT
 688 #define fstat_is_reliable() 0
 689 #else
 690 #define fstat_is_reliable() 1
 691 #endif
 692
 693 #ifndef va_copy
 694 /*
 695  * Since an obvious implementation of va_list would be to make it a
 696  * pointer into the stack frame, a simple assignment will work on
 697  * many systems.  But let's try to be more portable.
 698  */
 699 #ifdef __va_copy
 700 #define va_copy(dst, src) __va_copy(dst, src)
 701 #else
 702 #define va_copy(dst, src) ((dst) = (src))
 703 #endif
 704 #endif
 705
 706 /*
 707  * Preserves errno, prints a message, but gives no warning for ENOENT.
 708  * Always returns the return value of unlink(2).
 709  */
 710 int unlink_or_warn(const char *path);
 711 /*
 712  * Likewise for rmdir(2).
 713  */
 714 int rmdir_or_warn(const char *path);
 715 /*
 716  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 717  * the supplied file mode.
 718  */
 719 int remove_or_warn(unsigned int mode, const char *path);
 720
 721 /*
 722  * Call access(2), but warn for any error except "missing file"
 723  * (ENOENT or ENOTDIR).
 724  */
 725 #define ACCESS_EACCES_OK (1U << 0)
 726 int access_or_warn(const char *path, int mode, unsigned flag);
 727 int access_or_die(const char *path, int mode, unsigned flag);
 728
 729 /* Warn on an inaccessible file that ought to be accessible */
 730 void warn_on_inaccessible(const char *path);
 731
 732 /* Get the passwd entry for the UID of the current process. */
 733 struct passwd *xgetpwuid_self(void);
 734
 735 #ifdef GMTIME_UNRELIABLE_ERRORS
 736 struct tm *git_gmtime(const time_t *);
 737 struct tm *git_gmtime_r(const time_t *, struct tm *);
 738 #define gmtime git_gmtime
 739 #define gmtime_r git_gmtime_r
 740 #endif
 741
 742 #ifndef mark_as_git_dir
 743 #define mark_as_git_dir(x) /* noop */
 744 #endif
 745
 746 #ifndef get_home_directory
 747 #define get_home_directory() getenv("HOME")
 748 #endif
 749
 750 /*
 751  * Enable/disable a read-only cache for file system data on platforms that
 752  * support it.
 753  *
 754  * Implementing a live-cache is complicated and requires special platform
 755  * support (inotify, ReadDirectoryChangesW...). enable_fscache shall be used
 756  * to mark sections of git code that extensively read from the file system
 757  * without modifying anything. Implementations can use this to cache e.g. stat
 758  * data or even file content without the need to synchronize with the file
 759  * system.
 760  */
 761 #ifndef enable_fscache
 762 #define enable_fscache(x) /* noop */
 763 #endif
 764
 765 #endif