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