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 /*
  35  * Signed integer overflow is undefined in C, so here's a helper macro
  36  * to detect if the sum of two integers will overflow.
  37  *
  38  * Requires: a >= 0, typeof(a) equals typeof(b)
  39  */
  40 #define signed_add_overflows(a, b) \
  41     ((b) > maximum_signed_value_of_type(a) - (a))
  42
  43 #ifdef __GNUC__
  44 #define TYPEOF(x) (__typeof__(x))
  45 #else
  46 #define TYPEOF(x)
  47 #endif
  48
  49 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
  50 #define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  51
  52 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  53
  54 /* Approximation of the length of the decimal representation of this type. */
  55 #define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  56
  57 #if defined(__sun__)
  58  /*
  59   * On Solaris, when _XOPEN_EXTENDED is set, its header file
  60   * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
  61   * setting to say we are XPG5 or XPG6.  Also on Solaris,
  62   * XPG6 programs must be compiled with a c99 compiler, while
  63   * non XPG6 programs must be compiled with a pre-c99 compiler.
  64   */
  65 # if __STDC_VERSION__ - 0 >= 199901L
  66 # define _XOPEN_SOURCE 600
  67 # else
  68 # define _XOPEN_SOURCE 500
  69 # endif
  70 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
  71       !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__)
  72 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  73 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  74 #endif
  75 #define _ALL_SOURCE 1
  76 #define _GNU_SOURCE 1
  77 #define _BSD_SOURCE 1
  78 #define _NETBSD_SOURCE 1
  79 #define _SGI_SOURCE 1
  80
  81 #ifdef WIN32 /* Both MinGW and MSVC */
  82 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  83 #include <winsock2.h>
  84 #include <windows.h>
  85 #endif
  86
  87 #include <unistd.h>
  88 #include <stdio.h>
  89 #include <sys/stat.h>
  90 #include <fcntl.h>
  91 #include <stddef.h>
  92 #include <stdlib.h>
  93 #include <stdarg.h>
  94 #include <string.h>
  95 #include <errno.h>
  96 #include <limits.h>
  97 #include <sys/param.h>
  98 #include <sys/types.h>
  99 #include <dirent.h>
 100 #include <sys/time.h>
 101 #include <time.h>
 102 #include <signal.h>
 103 #include <fnmatch.h>
 104 #include <assert.h>
 105 #include <regex.h>
 106 #include <utime.h>
 107 #ifndef __MINGW32__
 108 #include <sys/wait.h>
 109 #include <sys/poll.h>
 110 #include <sys/socket.h>
 111 #include <sys/ioctl.h>
 112 #include <termios.h>
 113 #ifndef NO_SYS_SELECT_H
 114 #include <sys/select.h>
 115 #endif
 116 #include <netinet/in.h>
 117 #include <netinet/tcp.h>
 118 #include <arpa/inet.h>
 119 #include <netdb.h>
 120 #include <pwd.h>
 121 #include <inttypes.h>
 122 #if defined(__CYGWIN__)
 123 #undef _XOPEN_SOURCE
 124 #include <grp.h>
 125 #define _XOPEN_SOURCE 600
 126 #include "compat/cygwin.h"
 127 #else
 128 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 129 #include <grp.h>
 130 #define _ALL_SOURCE 1
 131 #endif
 132 #else   /* __MINGW32__ */
 133 /* pull in Windows compatibility stuff */
 134 #include "compat/mingw.h"
 135 #endif  /* __MINGW32__ */
 136 #ifdef _MSC_VER
 137 #include "compat/msvc.h"
 138 #endif
 139
 140 #ifndef NO_LIBGEN_H
 141 #include <libgen.h>
 142 #else
 143 #define basename gitbasename
 144 extern char *gitbasename(char *);
 145 #endif
 146
 147 #ifndef NO_ICONV
 148 #include <iconv.h>
 149 #endif
 150
 151 #ifndef NO_OPENSSL
 152 #include <openssl/ssl.h>
 153 #include <openssl/err.h>
 154 #endif
 155
 156 /* On most systems <limits.h> would have given us this, but
 157  * not on some systems (e.g. GNU/Hurd).
 158  */
 159 #ifndef PATH_MAX
 160 #define PATH_MAX 4096
 161 #endif
 162
 163 #ifndef PRIuMAX
 164 #define PRIuMAX "llu"
 165 #endif
 166
 167 #ifndef PRIu32
 168 #define PRIu32 "u"
 169 #endif
 170
 171 #ifndef PRIx32
 172 #define PRIx32 "x"
 173 #endif
 174
 175 #ifndef PRIo32
 176 #define PRIo32 "o"
 177 #endif
 178
 179 #ifndef PATH_SEP
 180 #define PATH_SEP ':'
 181 #endif
 182
 183 #ifdef HAVE_PATHS_H
 184 #include <paths.h>
 185 #endif
 186 #ifndef _PATH_DEFPATH
 187 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 188 #endif
 189
 190 #ifndef STRIP_EXTENSION
 191 #define STRIP_EXTENSION ""
 192 #endif
 193
 194 #ifndef has_dos_drive_prefix
 195 #define has_dos_drive_prefix(path) 0
 196 #endif
 197
 198 #ifndef is_dir_sep
 199 #define is_dir_sep(c) ((c) == '/')
 200 #endif
 201
 202 #ifdef __GNUC__
 203 #define NORETURN __attribute__((__noreturn__))
 204 #define NORETURN_PTR __attribute__((__noreturn__))
 205 #elif defined(_MSC_VER)
 206 #define NORETURN __declspec(noreturn)
 207 #define NORETURN_PTR
 208 #else
 209 #define NORETURN
 210 #define NORETURN_PTR
 211 #ifndef __attribute__
 212 #define __attribute__(x)
 213 #endif
 214 #endif
 215
 216 #include "compat/bswap.h"
 217
 218 /* General helper functions */
 219 extern void vreportf(const char *prefix, const char *err, va_list params);
 220 extern NORETURN void usage(const char *err);
 221 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 222 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 223 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 224 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 225 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 226
 227 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 228
 229 extern int prefixcmp(const char *str, const char *prefix);
 230 extern int suffixcmp(const char *str, const char *suffix);
 231
 232 static inline const char *skip_prefix(const char *str, const char *prefix)
 233 {
 234         size_t len = strlen(prefix);
 235         return strncmp(str, prefix, len) ? NULL : str + len;
 236 }
 237
 238 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 239
 240 #ifndef PROT_READ
 241 #define PROT_READ 1
 242 #define PROT_WRITE 2
 243 #define MAP_PRIVATE 1
 244 #endif
 245
 246 #define mmap git_mmap
 247 #define munmap git_munmap
 248 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 249 extern int git_munmap(void *start, size_t length);
 250
 251 #else /* NO_MMAP || USE_WIN32_MMAP */
 252
 253 #include <sys/mman.h>
 254
 255 #endif /* NO_MMAP || USE_WIN32_MMAP */
 256
 257 #ifdef NO_MMAP
 258
 259 /* This value must be multiple of (pagesize * 2) */
 260 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 261
 262 #else /* NO_MMAP */
 263
 264 /* This value must be multiple of (pagesize * 2) */
 265 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 266         (sizeof(void*) >= 8 \
 267                 ?  1 * 1024 * 1024 * 1024 \
 268                 : 32 * 1024 * 1024)
 269
 270 #endif /* NO_MMAP */
 271
 272 #ifndef MAP_FAILED
 273 #define MAP_FAILED ((void *)-1)
 274 #endif
 275
 276 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 277 #define on_disk_bytes(st) ((st).st_size)
 278 #else
 279 #define on_disk_bytes(st) ((st).st_blocks * 512)
 280 #endif
 281
 282 #define DEFAULT_PACKED_GIT_LIMIT \
 283         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 284
 285 #ifdef NO_PREAD
 286 #define pread git_pread
 287 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 288 #endif
 289 /*
 290  * Forward decl that will remind us if its twin in cache.h changes.
 291  * This function is used in compat/pread.c.  But we can't include
 292  * cache.h there.
 293  */
 294 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 295
 296 #ifdef NO_SETENV
 297 #define setenv gitsetenv
 298 extern int gitsetenv(const char *, const char *, int);
 299 #endif
 300
 301 #ifdef NO_MKDTEMP
 302 #define mkdtemp gitmkdtemp
 303 extern char *gitmkdtemp(char *);
 304 #endif
 305
 306 #ifdef NO_MKSTEMPS
 307 #define mkstemps gitmkstemps
 308 extern int gitmkstemps(char *, int);
 309 #endif
 310
 311 #ifdef NO_UNSETENV
 312 #define unsetenv gitunsetenv
 313 extern void gitunsetenv(const char *);
 314 #endif
 315
 316 #ifdef NO_STRCASESTR
 317 #define strcasestr gitstrcasestr
 318 extern char *gitstrcasestr(const char *haystack, const char *needle);
 319 #endif
 320
 321 #ifdef NO_STRLCPY
 322 #define strlcpy gitstrlcpy
 323 extern size_t gitstrlcpy(char *, const char *, size_t);
 324 #endif
 325
 326 #ifdef NO_STRTOUMAX
 327 #define strtoumax gitstrtoumax
 328 extern uintmax_t gitstrtoumax(const char *, char **, int);
 329 #endif
 330
 331 #ifdef NO_STRTOK_R
 332 #define strtok_r gitstrtok_r
 333 extern char *gitstrtok_r(char *s, const char *delim, char **save_ptr);
 334 #endif
 335
 336 #ifdef NO_HSTRERROR
 337 #define hstrerror githstrerror
 338 extern const char *githstrerror(int herror);
 339 #endif
 340
 341 #ifdef NO_MEMMEM
 342 #define memmem gitmemmem
 343 void *gitmemmem(const void *haystack, size_t haystacklen,
 344                 const void *needle, size_t needlelen);
 345 #endif
 346
 347 #ifdef FREAD_READS_DIRECTORIES
 348 #ifdef fopen
 349 #undef fopen
 350 #endif
 351 #define fopen(a,b) git_fopen(a,b)
 352 extern FILE *git_fopen(const char*, const char*);
 353 #endif
 354
 355 #ifdef SNPRINTF_RETURNS_BOGUS
 356 #define snprintf git_snprintf
 357 extern int git_snprintf(char *str, size_t maxsize,
 358                         const char *format, ...);
 359 #define vsnprintf git_vsnprintf
 360 extern int git_vsnprintf(char *str, size_t maxsize,
 361                          const char *format, va_list ap);
 362 #endif
 363
 364 #ifdef __GLIBC_PREREQ
 365 #if __GLIBC_PREREQ(2, 1)
 366 #define HAVE_STRCHRNUL
 367 #define HAVE_MEMPCPY
 368 #endif
 369 #endif
 370
 371 #ifndef HAVE_STRCHRNUL
 372 #define strchrnul gitstrchrnul
 373 static inline char *gitstrchrnul(const char *s, int c)
 374 {
 375         while (*s && *s != c)
 376                 s++;
 377         return (char *)s;
 378 }
 379 #endif
 380
 381 #ifndef HAVE_MEMPCPY
 382 #define mempcpy gitmempcpy
 383 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 384 {
 385         return (char *)memcpy(dest, src, n) + n;
 386 }
 387 #endif
 388
 389 extern void release_pack_memory(size_t, int);
 390
 391 typedef void (*try_to_free_t)(size_t);
 392 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 393
 394 extern char *xstrdup(const char *str);
 395 extern void *xmalloc(size_t size);
 396 extern void *xmallocz(size_t size);
 397 extern void *xmemdupz(const void *data, size_t len);
 398 extern char *xstrndup(const char *str, size_t len);
 399 extern void *xrealloc(void *ptr, size_t size);
 400 extern void *xcalloc(size_t nmemb, size_t size);
 401 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 402 extern ssize_t xread(int fd, void *buf, size_t len);
 403 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 404 extern int xdup(int fd);
 405 extern FILE *xfdopen(int fd, const char *mode);
 406 extern int xmkstemp(char *template);
 407 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 408 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 409
 410 static inline size_t xsize_t(off_t len)
 411 {
 412         if (len > (size_t) len)
 413                 die("Cannot handle files this big");
 414         return (size_t)len;
 415 }
 416
 417 static inline int has_extension(const char *filename, const char *ext)
 418 {
 419         size_t len = strlen(filename);
 420         size_t extlen = strlen(ext);
 421         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 422 }
 423
 424 /* Sane ctype - no locale, and works with signed chars */
 425 #undef isascii
 426 #undef isspace
 427 #undef isdigit
 428 #undef isalpha
 429 #undef isalnum
 430 #undef tolower
 431 #undef toupper
 432 extern unsigned char sane_ctype[256];
 433 #define GIT_SPACE 0x01
 434 #define GIT_DIGIT 0x02
 435 #define GIT_ALPHA 0x04
 436 #define GIT_GLOB_SPECIAL 0x08
 437 #define GIT_REGEX_SPECIAL 0x10
 438 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 439 #define isascii(x) (((x) & ~0x7f) == 0)
 440 #define isspace(x) sane_istest(x,GIT_SPACE)
 441 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 442 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 443 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 444 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 445 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 446 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 447 #define toupper(x) sane_case((unsigned char)(x), 0)
 448
 449 static inline int sane_case(int x, int high)
 450 {
 451         if (sane_istest(x, GIT_ALPHA))
 452                 x = (x & ~0x20) | high;
 453         return x;
 454 }
 455
 456 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 457 {
 458         unsigned long ul;
 459         char *p;
 460
 461         errno = 0;
 462         ul = strtoul(s, &p, base);
 463         if (errno || *p || p == s || (unsigned int) ul != ul)
 464                 return -1;
 465         *result = ul;
 466         return 0;
 467 }
 468
 469 static inline int strtol_i(char const *s, int base, int *result)
 470 {
 471         long ul;
 472         char *p;
 473
 474         errno = 0;
 475         ul = strtol(s, &p, base);
 476         if (errno || *p || p == s || (int) ul != ul)
 477                 return -1;
 478         *result = ul;
 479         return 0;
 480 }
 481
 482 #ifdef INTERNAL_QSORT
 483 void git_qsort(void *base, size_t nmemb, size_t size,
 484                int(*compar)(const void *, const void *));
 485 #define qsort git_qsort
 486 #endif
 487
 488 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 489 # define FORCE_DIR_SET_GID S_ISGID
 490 #else
 491 # define FORCE_DIR_SET_GID 0
 492 #endif
 493
 494 #ifdef NO_NSEC
 495 #undef USE_NSEC
 496 #define ST_CTIME_NSEC(st) 0
 497 #define ST_MTIME_NSEC(st) 0
 498 #else
 499 #ifdef USE_ST_TIMESPEC
 500 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 501 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 502 #else
 503 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 504 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 505 #endif
 506 #endif
 507
 508 #ifdef UNRELIABLE_FSTAT
 509 #define fstat_is_reliable() 0
 510 #else
 511 #define fstat_is_reliable() 1
 512 #endif
 513
 514 /*
 515  * Preserves errno, prints a message, but gives no warning for ENOENT.
 516  * Always returns the return value of unlink(2).
 517  */
 518 int unlink_or_warn(const char *path);
 519 /*
 520  * Likewise for rmdir(2).
 521  */
 522 int rmdir_or_warn(const char *path);
 523 /*
 524  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 525  * the supplied file mode.
 526  */
 527 int remove_or_warn(unsigned int mode, const char *path);
 528
 529 #endif