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 /* Approximation of the length of the decimal representation of this type. */
  17 #define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  18
  19 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  20 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  21 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  22 #endif
  23 #define _ALL_SOURCE 1
  24 #define _GNU_SOURCE 1
  25 #define _BSD_SOURCE 1
  26
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <stddef.h>
  32 #include <stdlib.h>
  33 #include <stdarg.h>
  34 #include <string.h>
  35 #include <errno.h>
  36 #include <limits.h>
  37 #include <sys/param.h>
  38 #include <sys/types.h>
  39 #include <dirent.h>
  40 #include <sys/time.h>
  41 #include <time.h>
  42 #include <signal.h>
  43 #include <sys/wait.h>
  44 #include <fnmatch.h>
  45 #include <sys/poll.h>
  46 #include <sys/socket.h>
  47 #include <assert.h>
  48 #include <regex.h>
  49 #include <netinet/in.h>
  50 #include <netinet/tcp.h>
  51 #include <arpa/inet.h>
  52 #include <netdb.h>
  53 #include <pwd.h>
  54 #include <inttypes.h>
  55 #if defined(__CYGWIN__)
  56 #undef _XOPEN_SOURCE
  57 #include <grp.h>
  58 #define _XOPEN_SOURCE 600
  59 #else
  60 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  61 #include <grp.h>
  62 #define _ALL_SOURCE 1
  63 #endif
  64
  65 #ifndef NO_ICONV
  66 #include <iconv.h>
  67 #endif
  68
  69 /* On most systems <limits.h> would have given us this, but
  70  * not on some systems (e.g. GNU/Hurd).
  71  */
  72 #ifndef PATH_MAX
  73 #define PATH_MAX 4096
  74 #endif
  75
  76 #ifndef PRIuMAX
  77 #define PRIuMAX "llu"
  78 #endif
  79
  80 #ifdef __GNUC__
  81 #define NORETURN __attribute__((__noreturn__))
  82 #else
  83 #define NORETURN
  84 #ifndef __attribute__
  85 #define __attribute__(x)
  86 #endif
  87 #endif
  88
  89 /* General helper functions */
  90 extern void usage(const char *err) NORETURN;
  91 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  92 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  93 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
  94
  95 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  96 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  97 extern void set_error_routine(void (*routine)(const char *err, va_list params));
  98 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  99
 100 #ifdef NO_MMAP
 101
 102 #ifndef PROT_READ
 103 #define PROT_READ 1
 104 #define PROT_WRITE 2
 105 #define MAP_PRIVATE 1
 106 #define MAP_FAILED ((void*)-1)
 107 #endif
 108
 109 #define mmap git_mmap
 110 #define munmap git_munmap
 111 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 112 extern int git_munmap(void *start, size_t length);
 113
 114 /* This value must be multiple of (pagesize * 2) */
 115 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 116
 117 #else /* NO_MMAP */
 118
 119 #include <sys/mman.h>
 120
 121 /* This value must be multiple of (pagesize * 2) */
 122 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 123         (sizeof(void*) >= 8 \
 124                 ?  1 * 1024 * 1024 * 1024 \
 125                 : 32 * 1024 * 1024)
 126
 127 #endif /* NO_MMAP */
 128
 129 #define DEFAULT_PACKED_GIT_LIMIT \
 130         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 131
 132 #ifdef NO_PREAD
 133 #define pread git_pread
 134 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 135 #endif
 136
 137 #ifdef NO_SETENV
 138 #define setenv gitsetenv
 139 extern int gitsetenv(const char *, const char *, int);
 140 #endif
 141
 142 #ifdef NO_UNSETENV
 143 #define unsetenv gitunsetenv
 144 extern void gitunsetenv(const char *);
 145 #endif
 146
 147 #ifdef NO_STRCASESTR
 148 #define strcasestr gitstrcasestr
 149 extern char *gitstrcasestr(const char *haystack, const char *needle);
 150 #endif
 151
 152 #ifdef NO_STRLCPY
 153 #define strlcpy gitstrlcpy
 154 extern size_t gitstrlcpy(char *, const char *, size_t);
 155 #endif
 156
 157 #ifdef NO_STRTOUMAX
 158 #define strtoumax gitstrtoumax
 159 extern uintmax_t gitstrtoumax(const char *, char **, int);
 160 #endif
 161
 162 extern void release_pack_memory(size_t, int);
 163
 164 static inline char* xstrdup(const char *str)
 165 {
 166         char *ret = strdup(str);
 167         if (!ret) {
 168                 release_pack_memory(strlen(str) + 1, -1);
 169                 ret = strdup(str);
 170                 if (!ret)
 171                         die("Out of memory, strdup failed");
 172         }
 173         return ret;
 174 }
 175
 176 static inline void *xmalloc(size_t size)
 177 {
 178         void *ret = malloc(size);
 179         if (!ret && !size)
 180                 ret = malloc(1);
 181         if (!ret) {
 182                 release_pack_memory(size, -1);
 183                 ret = malloc(size);
 184                 if (!ret && !size)
 185                         ret = malloc(1);
 186                 if (!ret)
 187                         die("Out of memory, malloc failed");
 188         }
 189 #ifdef XMALLOC_POISON
 190         memset(ret, 0xA5, size);
 191 #endif
 192         return ret;
 193 }
 194
 195 static inline char *xstrndup(const char *str, size_t len)
 196 {
 197         char *p;
 198
 199         p = memchr(str, '\0', len);
 200         if (p)
 201                 len = p - str;
 202         p = xmalloc(len + 1);
 203         memcpy(p, str, len);
 204         p[len] = '\0';
 205         return p;
 206 }
 207
 208 static inline void *xrealloc(void *ptr, size_t size)
 209 {
 210         void *ret = realloc(ptr, size);
 211         if (!ret && !size)
 212                 ret = realloc(ptr, 1);
 213         if (!ret) {
 214                 release_pack_memory(size, -1);
 215                 ret = realloc(ptr, size);
 216                 if (!ret && !size)
 217                         ret = realloc(ptr, 1);
 218                 if (!ret)
 219                         die("Out of memory, realloc failed");
 220         }
 221         return ret;
 222 }
 223
 224 static inline void *xcalloc(size_t nmemb, size_t size)
 225 {
 226         void *ret = calloc(nmemb, size);
 227         if (!ret && (!nmemb || !size))
 228                 ret = calloc(1, 1);
 229         if (!ret) {
 230                 release_pack_memory(nmemb * size, -1);
 231                 ret = calloc(nmemb, size);
 232                 if (!ret && (!nmemb || !size))
 233                         ret = calloc(1, 1);
 234                 if (!ret)
 235                         die("Out of memory, calloc failed");
 236         }
 237         return ret;
 238 }
 239
 240 static inline void *xmmap(void *start, size_t length,
 241         int prot, int flags, int fd, off_t offset)
 242 {
 243         void *ret = mmap(start, length, prot, flags, fd, offset);
 244         if (ret == MAP_FAILED) {
 245                 if (!length)
 246                         return NULL;
 247                 release_pack_memory(length, fd);
 248                 ret = mmap(start, length, prot, flags, fd, offset);
 249                 if (ret == MAP_FAILED)
 250                         die("Out of memory? mmap failed: %s", strerror(errno));
 251         }
 252         return ret;
 253 }
 254
 255 static inline ssize_t xread(int fd, void *buf, size_t len)
 256 {
 257         ssize_t nr;
 258         while (1) {
 259                 nr = read(fd, buf, len);
 260                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 261                         continue;
 262                 return nr;
 263         }
 264 }
 265
 266 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 267 {
 268         ssize_t nr;
 269         while (1) {
 270                 nr = write(fd, buf, len);
 271                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 272                         continue;
 273                 return nr;
 274         }
 275 }
 276
 277 static inline size_t xsize_t(off_t len)
 278 {
 279         return (size_t)len;
 280 }
 281
 282 static inline int has_extension(const char *filename, const char *ext)
 283 {
 284         size_t len = strlen(filename);
 285         size_t extlen = strlen(ext);
 286         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 287 }
 288
 289 /* Sane ctype - no locale, and works with signed chars */
 290 #undef isspace
 291 #undef isdigit
 292 #undef isalpha
 293 #undef isalnum
 294 #undef tolower
 295 #undef toupper
 296 extern unsigned char sane_ctype[256];
 297 #define GIT_SPACE 0x01
 298 #define GIT_DIGIT 0x02
 299 #define GIT_ALPHA 0x04
 300 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 301 #define isspace(x) sane_istest(x,GIT_SPACE)
 302 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 303 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 304 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 305 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 306 #define toupper(x) sane_case((unsigned char)(x), 0)
 307
 308 static inline int sane_case(int x, int high)
 309 {
 310         if (sane_istest(x, GIT_ALPHA))
 311                 x = (x & ~0x20) | high;
 312         return x;
 313 }
 314
 315 static inline int prefixcmp(const char *str, const char *prefix)
 316 {
 317         return strncmp(str, prefix, strlen(prefix));
 318 }
 319
 320 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 321 {
 322         unsigned long ul;
 323         char *p;
 324
 325         errno = 0;
 326         ul = strtoul(s, &p, base);
 327         if (errno || *p || p == s || (unsigned int) ul != ul)
 328                 return -1;
 329         *result = ul;
 330         return 0;
 331 }
 332
 333 #endif