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