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 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  17 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  18 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  19 #endif
  20 #define _ALL_SOURCE 1
  21 #define _GNU_SOURCE 1
  22 #define _BSD_SOURCE 1
  23
  24 #include <unistd.h>
  25 #include <stdio.h>
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28 #include <stddef.h>
  29 #include <stdlib.h>
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <limits.h>
  34 #include <sys/param.h>
  35 #include <sys/types.h>
  36 #include <dirent.h>
  37 #include <sys/time.h>
  38 #include <time.h>
  39 #include <signal.h>
  40 #include <sys/wait.h>
  41 #include <fnmatch.h>
  42 #include <sys/poll.h>
  43 #include <sys/socket.h>
  44 #include <assert.h>
  45 #include <regex.h>
  46 #include <netinet/in.h>
  47 #include <netinet/tcp.h>
  48 #include <arpa/inet.h>
  49 #include <netdb.h>
  50 #include <pwd.h>
  51 #include <inttypes.h>
  52 #if defined(__CYGWIN__)
  53 #undef _XOPEN_SOURCE
  54 #include <grp.h>
  55 #define _XOPEN_SOURCE 600
  56 #else
  57 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  58 #include <grp.h>
  59 #define _ALL_SOURCE 1
  60 #endif
  61
  62 #ifndef NO_ICONV
  63 #include <iconv.h>
  64 #endif
  65
  66 /* On most systems <limits.h> would have given us this, but
  67  * not on some systems (e.g. GNU/Hurd).
  68  */
  69 #ifndef PATH_MAX
  70 #define PATH_MAX 4096
  71 #endif
  72
  73 #ifdef __GNUC__
  74 #define NORETURN __attribute__((__noreturn__))
  75 #else
  76 #define NORETURN
  77 #ifndef __attribute__
  78 #define __attribute__(x)
  79 #endif
  80 #endif
  81
  82 /* General helper functions */
  83 extern void usage(const char *err) NORETURN;
  84 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  85 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  86 extern void warn(const char *err, ...) __attribute__((format (printf, 1, 2)));
  87
  88 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  89 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  90 extern void set_error_routine(void (*routine)(const char *err, va_list params));
  91 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  92
  93 #ifdef NO_MMAP
  94
  95 #ifndef PROT_READ
  96 #define PROT_READ 1
  97 #define PROT_WRITE 2
  98 #define MAP_PRIVATE 1
  99 #define MAP_FAILED ((void*)-1)
 100 #endif
 101
 102 #define mmap git_mmap
 103 #define munmap git_munmap
 104 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 105 extern int git_munmap(void *start, size_t length);
 106
 107 /* This value must be multiple of (pagesize * 2) */
 108 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 109
 110 #else /* NO_MMAP */
 111
 112 #include <sys/mman.h>
 113
 114 /* This value must be multiple of (pagesize * 2) */
 115 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 116         (sizeof(void*) >= 8 \
 117                 ?  1 * 1024 * 1024 * 1024 \
 118                 : 32 * 1024 * 1024)
 119
 120 #endif /* NO_MMAP */
 121
 122 #define DEFAULT_PACKED_GIT_LIMIT \
 123         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 124
 125 #ifdef NO_PREAD
 126 #define pread git_pread
 127 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 128 #endif
 129
 130 #ifdef NO_SETENV
 131 #define setenv gitsetenv
 132 extern int gitsetenv(const char *, const char *, int);
 133 #endif
 134
 135 #ifdef NO_UNSETENV
 136 #define unsetenv gitunsetenv
 137 extern void gitunsetenv(const char *);
 138 #endif
 139
 140 #ifdef NO_STRCASESTR
 141 #define strcasestr gitstrcasestr
 142 extern char *gitstrcasestr(const char *haystack, const char *needle);
 143 #endif
 144
 145 #ifdef NO_STRLCPY
 146 #define strlcpy gitstrlcpy
 147 extern size_t gitstrlcpy(char *, const char *, size_t);
 148 #endif
 149
 150 #ifdef NO_STRTOUMAX
 151 #define strtoumax gitstrtoumax
 152 extern uintmax_t gitstrtoumax(const char *, char **, int);
 153 #endif
 154
 155 extern void release_pack_memory(size_t);
 156
 157 static inline char* xstrdup(const char *str)
 158 {
 159         char *ret = strdup(str);
 160         if (!ret) {
 161                 release_pack_memory(strlen(str) + 1);
 162                 ret = strdup(str);
 163                 if (!ret)
 164                         die("Out of memory, strdup failed");
 165         }
 166         return ret;
 167 }
 168
 169 static inline void *xmalloc(size_t size)
 170 {
 171         void *ret = malloc(size);
 172         if (!ret && !size)
 173                 ret = malloc(1);
 174         if (!ret) {
 175                 release_pack_memory(size);
 176                 ret = malloc(size);
 177                 if (!ret && !size)
 178                         ret = malloc(1);
 179                 if (!ret)
 180                         die("Out of memory, malloc failed");
 181         }
 182 #ifdef XMALLOC_POISON
 183         memset(ret, 0xA5, size);
 184 #endif
 185         return ret;
 186 }
 187
 188 static inline void *xrealloc(void *ptr, size_t size)
 189 {
 190         void *ret = realloc(ptr, size);
 191         if (!ret && !size)
 192                 ret = realloc(ptr, 1);
 193         if (!ret) {
 194                 release_pack_memory(size);
 195                 ret = realloc(ptr, size);
 196                 if (!ret && !size)
 197                         ret = realloc(ptr, 1);
 198                 if (!ret)
 199                         die("Out of memory, realloc failed");
 200         }
 201         return ret;
 202 }
 203
 204 static inline void *xcalloc(size_t nmemb, size_t size)
 205 {
 206         void *ret = calloc(nmemb, size);
 207         if (!ret && (!nmemb || !size))
 208                 ret = calloc(1, 1);
 209         if (!ret) {
 210                 release_pack_memory(nmemb * size);
 211                 ret = calloc(nmemb, size);
 212                 if (!ret && (!nmemb || !size))
 213                         ret = calloc(1, 1);
 214                 if (!ret)
 215                         die("Out of memory, calloc failed");
 216         }
 217         return ret;
 218 }
 219
 220 static inline void *xmmap(void *start, size_t length,
 221         int prot, int flags, int fd, off_t offset)
 222 {
 223         void *ret = mmap(start, length, prot, flags, fd, offset);
 224         if (ret == MAP_FAILED) {
 225                 if (!length)
 226                         return NULL;
 227                 release_pack_memory(length);
 228                 ret = mmap(start, length, prot, flags, fd, offset);
 229                 if (ret == MAP_FAILED)
 230                         die("Out of memory? mmap failed: %s", strerror(errno));
 231         }
 232         return ret;
 233 }
 234
 235 static inline ssize_t xread(int fd, void *buf, size_t len)
 236 {
 237         ssize_t nr;
 238         while (1) {
 239                 nr = read(fd, buf, len);
 240                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 241                         continue;
 242                 return nr;
 243         }
 244 }
 245
 246 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 247 {
 248         ssize_t nr;
 249         while (1) {
 250                 nr = write(fd, buf, len);
 251                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 252                         continue;
 253                 return nr;
 254         }
 255 }
 256
 257 static inline int has_extension(const char *filename, const char *ext)
 258 {
 259         size_t len = strlen(filename);
 260         size_t extlen = strlen(ext);
 261         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 262 }
 263
 264 /* Sane ctype - no locale, and works with signed chars */
 265 #undef isspace
 266 #undef isdigit
 267 #undef isalpha
 268 #undef isalnum
 269 #undef tolower
 270 #undef toupper
 271 extern unsigned char sane_ctype[256];
 272 #define GIT_SPACE 0x01
 273 #define GIT_DIGIT 0x02
 274 #define GIT_ALPHA 0x04
 275 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 276 #define isspace(x) sane_istest(x,GIT_SPACE)
 277 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 278 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 279 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 280 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 281 #define toupper(x) sane_case((unsigned char)(x), 0)
 282
 283 static inline int sane_case(int x, int high)
 284 {
 285         if (sane_istest(x, GIT_ALPHA))
 286                 x = (x & ~0x20) | high;
 287         return x;
 288 }
 289
 290 static inline int prefixcmp(const char *str, const char *prefix)
 291 {
 292         return strncmp(str, prefix, strlen(prefix));
 293 }
 294
 295 #endif