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