git-compat-util.h

   1 #ifndef GIT_COMPAT_UTIL_H
   2 #define GIT_COMPAT_UTIL_H
   3
   4 #ifndef FLEX_ARRAY
   5 #if defined(__GNUC__) && (__GNUC__ < 3)
   6 #define FLEX_ARRAY 0
   7 #else
   8 #define FLEX_ARRAY /* empty */
   9 #endif
  10 #endif
  11
  12 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  13
  14 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  15 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  16 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  17 #endif
  18 #define _ALL_SOURCE 1
  19 #define _GNU_SOURCE 1
  20 #define _BSD_SOURCE 1
  21
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <sys/stat.h>
  25 #include <fcntl.h>
  26 #include <stddef.h>
  27 #include <stdlib.h>
  28 #include <stdarg.h>
  29 #include <string.h>
  30 #include <errno.h>
  31 #include <limits.h>
  32 #include <sys/param.h>
  33 #include <sys/types.h>
  34 #include <dirent.h>
  35 #include <sys/time.h>
  36 #include <time.h>
  37 #include <signal.h>
  38 #include <sys/wait.h>
  39 #include <fnmatch.h>
  40 #include <sys/poll.h>
  41 #include <sys/socket.h>
  42 #include <assert.h>
  43 #include <regex.h>
  44 #include <netinet/in.h>
  45 #include <netinet/tcp.h>
  46 #include <arpa/inet.h>
  47 #include <netdb.h>
  48 #include <pwd.h>
  49 #include <inttypes.h>
  50 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  51 #include <grp.h>
  52 #define _ALL_SOURCE 1
  53
  54 #ifndef NO_ICONV
  55 #include <iconv.h>
  56 #endif
  57
  58 /* On most systems <limits.h> would have given us this, but
  59  * not on some systems (e.g. GNU/Hurd).
  60  */
  61 #ifndef PATH_MAX
  62 #define PATH_MAX 4096
  63 #endif
  64
  65 #ifdef __GNUC__
  66 #define NORETURN __attribute__((__noreturn__))
  67 #else
  68 #define NORETURN
  69 #ifndef __attribute__
  70 #define __attribute__(x)
  71 #endif
  72 #endif
  73
  74 /* General helper functions */
  75 extern void usage(const char *err) NORETURN;
  76 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  77 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  78 extern void warn(const char *err, ...) __attribute__((format (printf, 1, 2)));
  79
  80 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  81 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  82 extern void set_error_routine(void (*routine)(const char *err, va_list params));
  83 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  84
  85 #ifdef NO_MMAP
  86
  87 #ifndef PROT_READ
  88 #define PROT_READ 1
  89 #define PROT_WRITE 2
  90 #define MAP_PRIVATE 1
  91 #define MAP_FAILED ((void*)-1)
  92 #endif
  93
  94 #define mmap git_mmap
  95 #define munmap git_munmap
  96 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
  97 extern int git_munmap(void *start, size_t length);
  98
  99 /* This value must be multiple of (pagesize * 2) */
 100 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 101
 102 #else /* NO_MMAP */
 103
 104 #include <sys/mman.h>
 105
 106 /* This value must be multiple of (pagesize * 2) */
 107 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 108         (sizeof(void*) >= 8 \
 109                 ?  1 * 1024 * 1024 * 1024 \
 110                 : 32 * 1024 * 1024)
 111
 112 #endif /* NO_MMAP */
 113
 114 #define DEFAULT_PACKED_GIT_LIMIT \
 115         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 116
 117 #ifdef NO_PREAD
 118 #define pread git_pread
 119 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 120 #endif
 121
 122 #ifdef NO_SETENV
 123 #define setenv gitsetenv
 124 extern int gitsetenv(const char *, const char *, int);
 125 #endif
 126
 127 #ifdef NO_UNSETENV
 128 #define unsetenv gitunsetenv
 129 extern void gitunsetenv(const char *);
 130 #endif
 131
 132 #ifdef NO_STRCASESTR
 133 #define strcasestr gitstrcasestr
 134 extern char *gitstrcasestr(const char *haystack, const char *needle);
 135 #endif
 136
 137 #ifdef NO_STRLCPY
 138 #define strlcpy gitstrlcpy
 139 extern size_t gitstrlcpy(char *, const char *, size_t);
 140 #endif
 141
 142 extern void release_pack_memory(size_t);
 143
 144 static inline char* xstrdup(const char *str)
 145 {
 146         char *ret = strdup(str);
 147         if (!ret) {
 148                 release_pack_memory(strlen(str) + 1);
 149                 ret = strdup(str);
 150                 if (!ret)
 151                         die("Out of memory, strdup failed");
 152         }
 153         return ret;
 154 }
 155
 156 static inline void *xmalloc(size_t size)
 157 {
 158         void *ret = malloc(size);
 159         if (!ret && !size)
 160                 ret = malloc(1);
 161         if (!ret) {
 162                 release_pack_memory(size);
 163                 ret = malloc(size);
 164                 if (!ret && !size)
 165                         ret = malloc(1);
 166                 if (!ret)
 167                         die("Out of memory, malloc failed");
 168         }
 169 #ifdef XMALLOC_POISON
 170         memset(ret, 0xA5, size);
 171 #endif
 172         return ret;
 173 }
 174
 175 static inline void *xrealloc(void *ptr, size_t size)
 176 {
 177         void *ret = realloc(ptr, size);
 178         if (!ret && !size)
 179                 ret = realloc(ptr, 1);
 180         if (!ret) {
 181                 release_pack_memory(size);
 182                 ret = realloc(ptr, size);
 183                 if (!ret && !size)
 184                         ret = realloc(ptr, 1);
 185                 if (!ret)
 186                         die("Out of memory, realloc failed");
 187         }
 188         return ret;
 189 }
 190
 191 static inline void *xcalloc(size_t nmemb, size_t size)
 192 {
 193         void *ret = calloc(nmemb, size);
 194         if (!ret && (!nmemb || !size))
 195                 ret = calloc(1, 1);
 196         if (!ret) {
 197                 release_pack_memory(nmemb * size);
 198                 ret = calloc(nmemb, size);
 199                 if (!ret && (!nmemb || !size))
 200                         ret = calloc(1, 1);
 201                 if (!ret)
 202                         die("Out of memory, calloc failed");
 203         }
 204         return ret;
 205 }
 206
 207 static inline void *xmmap(void *start, size_t length,
 208         int prot, int flags, int fd, off_t offset)
 209 {
 210         void *ret = mmap(start, length, prot, flags, fd, offset);
 211         if (ret == MAP_FAILED) {
 212                 if (!length)
 213                         return NULL;
 214                 release_pack_memory(length);
 215                 ret = mmap(start, length, prot, flags, fd, offset);
 216                 if (ret == MAP_FAILED)
 217                         die("Out of memory? mmap failed: %s", strerror(errno));
 218         }
 219         return ret;
 220 }
 221
 222 static inline ssize_t xread(int fd, void *buf, size_t len)
 223 {
 224         ssize_t nr;
 225         while (1) {
 226                 nr = read(fd, buf, len);
 227                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 228                         continue;
 229                 return nr;
 230         }
 231 }
 232
 233 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 234 {
 235         ssize_t nr;
 236         while (1) {
 237                 nr = write(fd, buf, len);
 238                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 239                         continue;
 240                 return nr;
 241         }
 242 }
 243
 244 static inline int has_extension(const char *filename, const char *ext)
 245 {
 246         size_t len = strlen(filename);
 247         size_t extlen = strlen(ext);
 248         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 249 }
 250
 251 /* Sane ctype - no locale, and works with signed chars */
 252 #undef isspace
 253 #undef isdigit
 254 #undef isalpha
 255 #undef isalnum
 256 #undef tolower
 257 #undef toupper
 258 extern unsigned char sane_ctype[256];
 259 #define GIT_SPACE 0x01
 260 #define GIT_DIGIT 0x02
 261 #define GIT_ALPHA 0x04
 262 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 263 #define isspace(x) sane_istest(x,GIT_SPACE)
 264 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 265 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 266 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 267 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 268 #define toupper(x) sane_case((unsigned char)(x), 0)
 269
 270 static inline int sane_case(int x, int high)
 271 {
 272         if (sane_istest(x, GIT_ALPHA))
 273                 x = (x & ~0x20) | high;
 274         return x;
 275 }
 276
 277 #endif