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