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 #if defined(__GNUC__) && (__GNUC__ < 3)
   8 #define FLEX_ARRAY 0
   9 #else
  10 #define FLEX_ARRAY /* empty */
  11 #endif
  12 #endif
  13
  14 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  15
  16 #ifdef __GNUC__
  17 #define TYPEOF(x) (__typeof__(x))
  18 #else
  19 #define TYPEOF(x)
  20 #endif
  21
  22 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
  23
  24 /* Approximation of the length of the decimal representation of this type. */
  25 #define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  26
  27 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  28 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  29 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  30 #endif
  31 #define _ALL_SOURCE 1
  32 #define _GNU_SOURCE 1
  33 #define _BSD_SOURCE 1
  34
  35 #include <unistd.h>
  36 #include <stdio.h>
  37 #include <sys/stat.h>
  38 #include <fcntl.h>
  39 #include <stddef.h>
  40 #include <stdlib.h>
  41 #include <stdarg.h>
  42 #include <string.h>
  43 #include <errno.h>
  44 #include <limits.h>
  45 #include <sys/param.h>
  46 #include <sys/types.h>
  47 #include <dirent.h>
  48 #include <sys/time.h>
  49 #include <time.h>
  50 #include <signal.h>
  51 #include <fnmatch.h>
  52 #ifndef __MINGW32__
  53 #include <sys/wait.h>
  54 #include <sys/poll.h>
  55 #include <sys/socket.h>
  56 #include <sys/select.h>
  57 #else
  58 int mkstemp (char *__template);
  59 #endif
  60 #include <assert.h>
  61 #include <regex.h>
  62 #ifndef __MINGW32__
  63 #include <netinet/in.h>
  64 #include <netinet/tcp.h>
  65 #include <arpa/inet.h>
  66 #endif
  67 #ifndef NO_ETC_PASSWD
  68 #include <netdb.h>
  69 #include <pwd.h>
  70 #include <inttypes.h>
  71 #if defined(__CYGWIN__)
  72 #undef _XOPEN_SOURCE
  73 #include <grp.h>
  74 #define _XOPEN_SOURCE 600
  75 #else
  76 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  77 #include <grp.h>
  78 #define _ALL_SOURCE 1
  79 #endif
  80 #endif
  81
  82 #ifndef NO_ICONV
  83 #include <iconv.h>
  84 #endif
  85
  86 /* On most systems <limits.h> would have given us this, but
  87  * not on some systems (e.g. GNU/Hurd).
  88  */
  89 #ifndef PATH_MAX
  90 #define PATH_MAX 4096
  91 #endif
  92
  93 #ifndef PRIuMAX
  94 #ifndef __MINGW32__
  95 #define PRIuMAX "llu"
  96 #else
  97 #define PRIuMAX "I64u"
  98 #endif
  99 #endif
 100
 101 #ifdef __GNUC__
 102 #define NORETURN __attribute__((__noreturn__))
 103 #else
 104 #define NORETURN
 105 #ifndef __attribute__
 106 #define __attribute__(x)
 107 #endif
 108 #endif
 109
 110 /* General helper functions */
 111 extern void usage(const char *err) NORETURN;
 112 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 113 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 114 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 115
 116 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 117 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 118 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 119 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 120
 121 #ifdef NO_MMAP
 122
 123 #ifndef PROT_READ
 124 #define PROT_READ 1
 125 #define PROT_WRITE 2
 126 #define MAP_PRIVATE 1
 127 #define MAP_FAILED ((void*)-1)
 128 #endif
 129
 130 #define mmap git_mmap
 131 #define munmap git_munmap
 132 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 133 extern int git_munmap(void *start, size_t length);
 134
 135 /* This value must be multiple of (pagesize * 2) */
 136 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 137
 138 #else /* NO_MMAP */
 139
 140 #include <sys/mman.h>
 141
 142 /* This value must be multiple of (pagesize * 2) */
 143 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 144         (sizeof(void*) >= 8 \
 145                 ?  1 * 1024 * 1024 * 1024 \
 146                 : 32 * 1024 * 1024)
 147
 148 #endif /* NO_MMAP */
 149
 150 #define DEFAULT_PACKED_GIT_LIMIT \
 151         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 152
 153 #ifdef NO_PREAD
 154 #define pread git_pread
 155 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 156 #endif
 157
 158 #ifdef NO_SETENV
 159 #define setenv gitsetenv
 160 extern int gitsetenv(const char *, const char *, int);
 161 #endif
 162
 163 #ifdef NO_UNSETENV
 164 #define unsetenv gitunsetenv
 165 extern void gitunsetenv(const char *);
 166 #endif
 167
 168 #ifdef NO_STRCASESTR
 169 #define strcasestr gitstrcasestr
 170 extern char *gitstrcasestr(const char *haystack, const char *needle);
 171 #endif
 172
 173 #ifdef NO_STRLCPY
 174 #define strlcpy gitstrlcpy
 175 extern size_t gitstrlcpy(char *, const char *, size_t);
 176 #endif
 177
 178 #ifdef NO_STRTOUMAX
 179 #define strtoumax gitstrtoumax
 180 extern uintmax_t gitstrtoumax(const char *, char **, int);
 181 #endif
 182
 183 #ifdef NO_HSTRERROR
 184 #define hstrerror githstrerror
 185 extern const char *githstrerror(int herror);
 186 #endif
 187
 188 extern void release_pack_memory(size_t, int);
 189
 190 static inline char* xstrdup(const char *str)
 191 {
 192         char *ret = strdup(str);
 193         if (!ret) {
 194                 release_pack_memory(strlen(str) + 1, -1);
 195                 ret = strdup(str);
 196                 if (!ret)
 197                         die("Out of memory, strdup failed");
 198         }
 199         return ret;
 200 }
 201
 202 static inline void *xmalloc(size_t size)
 203 {
 204         void *ret = malloc(size);
 205         if (!ret && !size)
 206                 ret = malloc(1);
 207         if (!ret) {
 208                 release_pack_memory(size, -1);
 209                 ret = malloc(size);
 210                 if (!ret && !size)
 211                         ret = malloc(1);
 212                 if (!ret)
 213                         die("Out of memory, malloc failed");
 214         }
 215 #ifdef XMALLOC_POISON
 216         memset(ret, 0xA5, size);
 217 #endif
 218         return ret;
 219 }
 220
 221 static inline char *xstrndup(const char *str, size_t len)
 222 {
 223         char *p;
 224
 225         p = memchr(str, '\0', len);
 226         if (p)
 227                 len = p - str;
 228         p = xmalloc(len + 1);
 229         memcpy(p, str, len);
 230         p[len] = '\0';
 231         return p;
 232 }
 233
 234 static inline void *xrealloc(void *ptr, size_t size)
 235 {
 236         void *ret = realloc(ptr, size);
 237         if (!ret && !size)
 238                 ret = realloc(ptr, 1);
 239         if (!ret) {
 240                 release_pack_memory(size, -1);
 241                 ret = realloc(ptr, size);
 242                 if (!ret && !size)
 243                         ret = realloc(ptr, 1);
 244                 if (!ret)
 245                         die("Out of memory, realloc failed");
 246         }
 247         return ret;
 248 }
 249
 250 static inline void *xcalloc(size_t nmemb, size_t size)
 251 {
 252         void *ret = calloc(nmemb, size);
 253         if (!ret && (!nmemb || !size))
 254                 ret = calloc(1, 1);
 255         if (!ret) {
 256                 release_pack_memory(nmemb * size, -1);
 257                 ret = calloc(nmemb, size);
 258                 if (!ret && (!nmemb || !size))
 259                         ret = calloc(1, 1);
 260                 if (!ret)
 261                         die("Out of memory, calloc failed");
 262         }
 263         return ret;
 264 }
 265
 266 static inline void *xmmap(void *start, size_t length,
 267         int prot, int flags, int fd, off_t offset)
 268 {
 269         void *ret = mmap(start, length, prot, flags, fd, offset);
 270         if (ret == MAP_FAILED) {
 271                 if (!length)
 272                         return NULL;
 273                 release_pack_memory(length, fd);
 274                 ret = mmap(start, length, prot, flags, fd, offset);
 275                 if (ret == MAP_FAILED)
 276                         die("Out of memory? mmap failed: %s", strerror(errno));
 277         }
 278         return ret;
 279 }
 280
 281 static inline ssize_t xread(int fd, void *buf, size_t len)
 282 {
 283         ssize_t nr;
 284         while (1) {
 285                 nr = read(fd, buf, len);
 286                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 287                         continue;
 288                 return nr;
 289         }
 290 }
 291
 292 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 293 {
 294         ssize_t nr;
 295         while (1) {
 296                 nr = write(fd, buf, len);
 297                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 298                         continue;
 299                 return nr;
 300         }
 301 }
 302
 303 static inline int xdup(int fd)
 304 {
 305         int ret = dup(fd);
 306         if (ret < 0)
 307                 die("dup failed: %s", strerror(errno));
 308         return ret;
 309 }
 310
 311 static inline FILE *xfdopen(int fd, const char *mode)
 312 {
 313         FILE *stream = fdopen(fd, mode);
 314         if (stream == NULL)
 315                 die("Out of memory? fdopen failed: %s", strerror(errno));
 316         return stream;
 317 }
 318
 319 static inline int xmkstemp(char *template)
 320 {
 321         int fd;
 322
 323         fd = mkstemp(template);
 324         if (fd < 0)
 325                 die("Unable to create temporary file: %s", strerror(errno));
 326         return fd;
 327 }
 328
 329 static inline size_t xsize_t(off_t len)
 330 {
 331         return (size_t)len;
 332 }
 333
 334 static inline int has_extension(const char *filename, const char *ext)
 335 {
 336         size_t len = strlen(filename);
 337         size_t extlen = strlen(ext);
 338         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 339 }
 340
 341 /* Sane ctype - no locale, and works with signed chars */
 342 #undef isspace
 343 #undef isdigit
 344 #undef isalpha
 345 #undef isalnum
 346 #undef tolower
 347 #undef toupper
 348 extern unsigned char sane_ctype[256];
 349 #define GIT_SPACE 0x01
 350 #define GIT_DIGIT 0x02
 351 #define GIT_ALPHA 0x04
 352 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 353 #define isspace(x) sane_istest(x,GIT_SPACE)
 354 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 355 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 356 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 357 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 358 #define toupper(x) sane_case((unsigned char)(x), 0)
 359
 360 static inline int sane_case(int x, int high)
 361 {
 362         if (sane_istest(x, GIT_ALPHA))
 363                 x = (x & ~0x20) | high;
 364         return x;
 365 }
 366
 367 static inline int prefixcmp(const char *str, const char *prefix)
 368 {
 369         return strncmp(str, prefix, strlen(prefix));
 370 }
 371
 372 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 373 {
 374         unsigned long ul;
 375         char *p;
 376
 377         errno = 0;
 378         ul = strtoul(s, &p, base);
 379         if (errno || *p || p == s || (unsigned int) ul != ul)
 380                 return -1;
 381         *result = ul;
 382         return 0;
 383 }
 384
 385 #ifdef __MINGW32__
 386
 387 #ifndef S_ISLNK
 388 #define S_IFLNK    0120000 /* Symbolic link */
 389 #define S_ISLNK(x) (((x) & S_IFMT) == S_IFLNK)
 390 #define S_ISSOCK(x) 0
 391 #endif
 392
 393 #ifndef S_ISGRP
 394 #define S_ISGRP(x) 0
 395 #define S_IRGRP 0
 396 #define S_IWGRP 0
 397 #define S_IXGRP 0
 398 #define S_ISGID 0
 399 #define S_IROTH 0
 400 #define S_IXOTH 0
 401 #endif
 402
 403 int readlink(const char *path, char *buf, size_t bufsiz);
 404 int symlink(const char *oldpath, const char *newpath);
 405 #define link symlink
 406 int fchmod(int fildes, mode_t mode);
 407 int lstat(const char *file_name, struct stat *buf);
 408
 409 /* missing: link, mkstemp, fchmod, getuid (?), gettimeofday */
 410 int socketpair(int d, int type, int protocol, int sv[2]);
 411 #define AF_UNIX 0
 412 #define SOCK_STREAM 0
 413 int syslog(int type, char *bufp, ...);
 414 #define LOG_ERR 1
 415 #define LOG_INFO 2
 416 #define LOG_DAEMON 4
 417 unsigned int alarm(unsigned int seconds);
 418 #include <winsock2.h>
 419 void mingw_execve(const char *cmd, const char **argv, const char **env);
 420 #define execve mingw_execve
 421 int fork();
 422 typedef int pid_t;
 423 #define waitpid(pid, status, options) \
 424         ((options == 0) ? _cwait((status), (pid), 0) \
 425                 : (errno = EINVAL, -1))
 426 #define WIFEXITED(x) ((unsigned)(x) < 259)      /* STILL_ACTIVE */
 427 #define WEXITSTATUS(x) ((x) & 0xff)
 428 #define WIFSIGNALED(x) ((unsigned)(x) > 259)
 429 #define WTERMSIG(x) (x)
 430 #define WNOHANG 1
 431 #define SIGKILL 0
 432 #define SIGCHLD 0
 433 #define SIGALRM 0
 434 #define SIGPIPE 0
 435 #define ECONNABORTED 0
 436
 437 int kill(pid_t pid, int sig);
 438 unsigned int sleep (unsigned int __seconds);
 439 const char *inet_ntop(int af, const void *src,
 440                              char *dst, size_t cnt);
 441 int gettimeofday(struct timeval *tv, void *tz);
 442 int pipe(int filedes[2]);
 443
 444 struct pollfd {
 445         int fd;           /* file descriptor */
 446         short events;     /* requested events */
 447         short revents;    /* returned events */
 448 };
 449 int poll(struct pollfd *ufds, unsigned int nfds, int timeout);
 450 #define POLLIN 1
 451 #define POLLHUP 2
 452
 453 static inline int git_mkdir(const char *path, int mode)
 454 {
 455         return mkdir(path);
 456 }
 457 #define mkdir git_mkdir
 458
 459 static inline int git_unlink(const char *pathname) {
 460         /* read-only files cannot be removed */
 461         chmod(pathname, 0666);
 462         return unlink(pathname);
 463 }
 464 #define unlink git_unlink
 465
 466 #define open(P, F, M...) \
 467         (__builtin_constant_p(*(P)) && !strcmp(P, "/dev/null") ? \
 468                 open("nul", F, ## M) : open(P, F, ## M))
 469
 470 #include <time.h>
 471 struct tm *gmtime_r(const time_t *timep, struct tm *result);
 472 struct tm *localtime_r(const time_t *timep, struct tm *result);
 473 #define hstrerror strerror
 474
 475 char *mingw_getcwd(char *pointer, int len);
 476 #define getcwd mingw_getcwd
 477
 478 int mingw_socket(int domain, int type, int protocol);
 479 #define socket mingw_socket
 480
 481 int mingw_rename(const char*, const char*);
 482 #define rename mingw_rename
 483
 484 #define setlinebuf(x)
 485 #define fsync(x) 0
 486 #define getppid() 1
 487
 488 extern void quote_argv(const char **dst, const char **src);
 489 extern const char *parse_interpreter(const char *cmd);
 490
 491 /* Use git_lstat() instead of lstat()/stat() and
 492  * git_fstat() instead of fstat() on Windows
 493  */
 494 int git_lstat(const char *file_name, struct stat *buf);
 495 int git_fstat(int fd, struct stat *buf);
 496 #define lstat(x,y) git_lstat(x,y)
 497 #define stat(x,y) git_lstat(x,y)
 498 #define fstat(x,y) git_fstat(x,y)
 499 #endif /* __MINGW32__ */
 500
 501 #endif