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 #ifdef NO_STRTOUMAX
 143 #define strtoumax gitstrtoumax
 144 extern uintmax_t gitstrtoumax(const char *, char **, int);
 145 #endif
 146
 147 extern void release_pack_memory(size_t);
 148
 149 static inline char* xstrdup(const char *str)
 150 {
 151         char *ret = strdup(str);
 152         if (!ret) {
 153                 release_pack_memory(strlen(str) + 1);
 154                 ret = strdup(str);
 155                 if (!ret)
 156                         die("Out of memory, strdup failed");
 157         }
 158         return ret;
 159 }
 160
 161 static inline void *xmalloc(size_t size)
 162 {
 163         void *ret = malloc(size);
 164         if (!ret && !size)
 165                 ret = malloc(1);
 166         if (!ret) {
 167                 release_pack_memory(size);
 168                 ret = malloc(size);
 169                 if (!ret && !size)
 170                         ret = malloc(1);
 171                 if (!ret)
 172                         die("Out of memory, malloc failed");
 173         }
 174 #ifdef XMALLOC_POISON
 175         memset(ret, 0xA5, size);
 176 #endif
 177         return ret;
 178 }
 179
 180 static inline void *xrealloc(void *ptr, size_t size)
 181 {
 182         void *ret = realloc(ptr, size);
 183         if (!ret && !size)
 184                 ret = realloc(ptr, 1);
 185         if (!ret) {
 186                 release_pack_memory(size);
 187                 ret = realloc(ptr, size);
 188                 if (!ret && !size)
 189                         ret = realloc(ptr, 1);
 190                 if (!ret)
 191                         die("Out of memory, realloc failed");
 192         }
 193         return ret;
 194 }
 195
 196 static inline void *xcalloc(size_t nmemb, size_t size)
 197 {
 198         void *ret = calloc(nmemb, size);
 199         if (!ret && (!nmemb || !size))
 200                 ret = calloc(1, 1);
 201         if (!ret) {
 202                 release_pack_memory(nmemb * size);
 203                 ret = calloc(nmemb, size);
 204                 if (!ret && (!nmemb || !size))
 205                         ret = calloc(1, 1);
 206                 if (!ret)
 207                         die("Out of memory, calloc failed");
 208         }
 209         return ret;
 210 }
 211
 212 static inline void *xmmap(void *start, size_t length,
 213         int prot, int flags, int fd, off_t offset)
 214 {
 215         void *ret = mmap(start, length, prot, flags, fd, offset);
 216         if (ret == MAP_FAILED) {
 217                 if (!length)
 218                         return NULL;
 219                 release_pack_memory(length);
 220                 ret = mmap(start, length, prot, flags, fd, offset);
 221                 if (ret == MAP_FAILED)
 222                         die("Out of memory? mmap failed: %s", strerror(errno));
 223         }
 224         return ret;
 225 }
 226
 227 static inline ssize_t xread(int fd, void *buf, size_t len)
 228 {
 229         ssize_t nr;
 230         while (1) {
 231                 nr = read(fd, buf, len);
 232                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 233                         continue;
 234                 return nr;
 235         }
 236 }
 237
 238 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 239 {
 240         ssize_t nr;
 241         while (1) {
 242                 nr = write(fd, buf, len);
 243                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 244                         continue;
 245                 return nr;
 246         }
 247 }
 248
 249 static inline int has_extension(const char *filename, const char *ext)
 250 {
 251         size_t len = strlen(filename);
 252         size_t extlen = strlen(ext);
 253         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 254 }
 255
 256 /* Sane ctype - no locale, and works with signed chars */
 257 #undef isspace
 258 #undef isdigit
 259 #undef isalpha
 260 #undef isalnum
 261 #undef tolower
 262 #undef toupper
 263 extern unsigned char sane_ctype[256];
 264 #define GIT_SPACE 0x01
 265 #define GIT_DIGIT 0x02
 266 #define GIT_ALPHA 0x04
 267 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 268 #define isspace(x) sane_istest(x,GIT_SPACE)
 269 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 270 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 271 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 272 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 273 #define toupper(x) sane_case((unsigned char)(x), 0)
 274
 275 static inline int sane_case(int x, int high)
 276 {
 277         if (sane_istest(x, GIT_ALPHA))
 278                 x = (x & ~0x20) | high;
 279         return x;
 280 }
 281
 282 #endif