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