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