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 #ifdef __GNUC__
  17 #define TYPEOF(x) (__typeof__(x))
  18 #else
  19 #define TYPEOF(x)
  20 #endif
  21
  22 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
  23
  24 /* Approximation of the length of the decimal representation of this type. */
  25 #define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  26
  27 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  28 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  29 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  30 #endif
  31 #define _ALL_SOURCE 1
  32 #define _GNU_SOURCE 1
  33 #define _BSD_SOURCE 1
  34
  35 #include <unistd.h>
  36 #include <stdio.h>
  37 #include <sys/stat.h>
  38 #include <fcntl.h>
  39 #include <stddef.h>
  40 #include <stdlib.h>
  41 #include <stdarg.h>
  42 #include <string.h>
  43 #include <errno.h>
  44 #include <limits.h>
  45 #include <sys/param.h>
  46 #include <sys/types.h>
  47 #include <dirent.h>
  48 #include <sys/time.h>
  49 #include <time.h>
  50 #include <signal.h>
  51 #include <sys/wait.h>
  52 #include <fnmatch.h>
  53 #include <sys/poll.h>
  54 #include <sys/socket.h>
  55 #include <assert.h>
  56 #include <regex.h>
  57 #include <netinet/in.h>
  58 #include <netinet/tcp.h>
  59 #include <arpa/inet.h>
  60 #include <netdb.h>
  61 #include <pwd.h>
  62 #include <inttypes.h>
  63 #if defined(__CYGWIN__)
  64 #undef _XOPEN_SOURCE
  65 #include <grp.h>
  66 #define _XOPEN_SOURCE 600
  67 #else
  68 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  69 #include <grp.h>
  70 #define _ALL_SOURCE 1
  71 #endif
  72
  73 #ifndef NO_ICONV
  74 #include <iconv.h>
  75 #endif
  76
  77 /* On most systems <limits.h> would have given us this, but
  78  * not on some systems (e.g. GNU/Hurd).
  79  */
  80 #ifndef PATH_MAX
  81 #define PATH_MAX 4096
  82 #endif
  83
  84 #ifndef PRIuMAX
  85 #define PRIuMAX "llu"
  86 #endif
  87
  88 #ifdef __GNUC__
  89 #define NORETURN __attribute__((__noreturn__))
  90 #else
  91 #define NORETURN
  92 #ifndef __attribute__
  93 #define __attribute__(x)
  94 #endif
  95 #endif
  96
  97 /* General helper functions */
  98 extern void usage(const char *err) NORETURN;
  99 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 100 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 101 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 102
 103 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 104 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 105 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 106 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 107
 108 #ifdef NO_MMAP
 109
 110 #ifndef PROT_READ
 111 #define PROT_READ 1
 112 #define PROT_WRITE 2
 113 #define MAP_PRIVATE 1
 114 #define MAP_FAILED ((void*)-1)
 115 #endif
 116
 117 #define mmap git_mmap
 118 #define munmap git_munmap
 119 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 120 extern int git_munmap(void *start, size_t length);
 121
 122 /* This value must be multiple of (pagesize * 2) */
 123 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 124
 125 #else /* NO_MMAP */
 126
 127 #include <sys/mman.h>
 128
 129 /* This value must be multiple of (pagesize * 2) */
 130 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 131         (sizeof(void*) >= 8 \
 132                 ?  1 * 1024 * 1024 * 1024 \
 133                 : 32 * 1024 * 1024)
 134
 135 #endif /* NO_MMAP */
 136
 137 #define DEFAULT_PACKED_GIT_LIMIT \
 138         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 139
 140 #ifdef NO_PREAD
 141 #define pread git_pread
 142 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 143 #endif
 144
 145 #ifdef NO_SETENV
 146 #define setenv gitsetenv
 147 extern int gitsetenv(const char *, const char *, int);
 148 #endif
 149
 150 #ifdef NO_UNSETENV
 151 #define unsetenv gitunsetenv
 152 extern void gitunsetenv(const char *);
 153 #endif
 154
 155 #ifdef NO_STRCASESTR
 156 #define strcasestr gitstrcasestr
 157 extern char *gitstrcasestr(const char *haystack, const char *needle);
 158 #endif
 159
 160 #ifdef NO_STRLCPY
 161 #define strlcpy gitstrlcpy
 162 extern size_t gitstrlcpy(char *, const char *, size_t);
 163 #endif
 164
 165 #ifdef NO_STRTOUMAX
 166 #define strtoumax gitstrtoumax
 167 extern uintmax_t gitstrtoumax(const char *, char **, int);
 168 #endif
 169
 170 #ifdef NO_HSTRERROR
 171 #define hstrerror githstrerror
 172 extern const char *githstrerror(int herror);
 173 #endif
 174
 175 extern void release_pack_memory(size_t, int);
 176
 177 static inline char* xstrdup(const char *str)
 178 {
 179         char *ret = strdup(str);
 180         if (!ret) {
 181                 release_pack_memory(strlen(str) + 1, -1);
 182                 ret = strdup(str);
 183                 if (!ret)
 184                         die("Out of memory, strdup failed");
 185         }
 186         return ret;
 187 }
 188
 189 static inline void *xmalloc(size_t size)
 190 {
 191         void *ret = malloc(size);
 192         if (!ret && !size)
 193                 ret = malloc(1);
 194         if (!ret) {
 195                 release_pack_memory(size, -1);
 196                 ret = malloc(size);
 197                 if (!ret && !size)
 198                         ret = malloc(1);
 199                 if (!ret)
 200                         die("Out of memory, malloc failed");
 201         }
 202 #ifdef XMALLOC_POISON
 203         memset(ret, 0xA5, size);
 204 #endif
 205         return ret;
 206 }
 207
 208 static inline char *xstrndup(const char *str, size_t len)
 209 {
 210         char *p;
 211
 212         p = memchr(str, '\0', len);
 213         if (p)
 214                 len = p - str;
 215         p = xmalloc(len + 1);
 216         memcpy(p, str, len);
 217         p[len] = '\0';
 218         return p;
 219 }
 220
 221 static inline void *xrealloc(void *ptr, size_t size)
 222 {
 223         void *ret = realloc(ptr, size);
 224         if (!ret && !size)
 225                 ret = realloc(ptr, 1);
 226         if (!ret) {
 227                 release_pack_memory(size, -1);
 228                 ret = realloc(ptr, size);
 229                 if (!ret && !size)
 230                         ret = realloc(ptr, 1);
 231                 if (!ret)
 232                         die("Out of memory, realloc failed");
 233         }
 234         return ret;
 235 }
 236
 237 static inline void *xcalloc(size_t nmemb, size_t size)
 238 {
 239         void *ret = calloc(nmemb, size);
 240         if (!ret && (!nmemb || !size))
 241                 ret = calloc(1, 1);
 242         if (!ret) {
 243                 release_pack_memory(nmemb * size, -1);
 244                 ret = calloc(nmemb, size);
 245                 if (!ret && (!nmemb || !size))
 246                         ret = calloc(1, 1);
 247                 if (!ret)
 248                         die("Out of memory, calloc failed");
 249         }
 250         return ret;
 251 }
 252
 253 static inline void *xmmap(void *start, size_t length,
 254         int prot, int flags, int fd, off_t offset)
 255 {
 256         void *ret = mmap(start, length, prot, flags, fd, offset);
 257         if (ret == MAP_FAILED) {
 258                 if (!length)
 259                         return NULL;
 260                 release_pack_memory(length, fd);
 261                 ret = mmap(start, length, prot, flags, fd, offset);
 262                 if (ret == MAP_FAILED)
 263                         die("Out of memory? mmap failed: %s", strerror(errno));
 264         }
 265         return ret;
 266 }
 267
 268 static inline ssize_t xread(int fd, void *buf, size_t len)
 269 {
 270         ssize_t nr;
 271         while (1) {
 272                 nr = read(fd, buf, len);
 273                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 274                         continue;
 275                 return nr;
 276         }
 277 }
 278
 279 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 280 {
 281         ssize_t nr;
 282         while (1) {
 283                 nr = write(fd, buf, len);
 284                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 285                         continue;
 286                 return nr;
 287         }
 288 }
 289
 290 static inline int xdup(int fd)
 291 {
 292         int ret = dup(fd);
 293         if (ret < 0)
 294                 die("dup failed: %s", strerror(errno));
 295         return ret;
 296 }
 297
 298 static inline FILE *xfdopen(int fd, const char *mode)
 299 {
 300         FILE *stream = fdopen(fd, mode);
 301         if (stream == NULL)
 302                 die("Out of memory? fdopen failed: %s", strerror(errno));
 303         return stream;
 304 }
 305
 306 static inline size_t xsize_t(off_t len)
 307 {
 308         return (size_t)len;
 309 }
 310
 311 static inline int has_extension(const char *filename, const char *ext)
 312 {
 313         size_t len = strlen(filename);
 314         size_t extlen = strlen(ext);
 315         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 316 }
 317
 318 /* Sane ctype - no locale, and works with signed chars */
 319 #undef isspace
 320 #undef isdigit
 321 #undef isalpha
 322 #undef isalnum
 323 #undef tolower
 324 #undef toupper
 325 extern unsigned char sane_ctype[256];
 326 #define GIT_SPACE 0x01
 327 #define GIT_DIGIT 0x02
 328 #define GIT_ALPHA 0x04
 329 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 330 #define isspace(x) sane_istest(x,GIT_SPACE)
 331 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 332 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 333 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 334 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 335 #define toupper(x) sane_case((unsigned char)(x), 0)
 336
 337 static inline int sane_case(int x, int high)
 338 {
 339         if (sane_istest(x, GIT_ALPHA))
 340                 x = (x & ~0x20) | high;
 341         return x;
 342 }
 343
 344 static inline int prefixcmp(const char *str, const char *prefix)
 345 {
 346         return strncmp(str, prefix, strlen(prefix));
 347 }
 348
 349 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 350 {
 351         unsigned long ul;
 352         char *p;
 353
 354         errno = 0;
 355         ul = strtoul(s, &p, base);
 356         if (errno || *p || p == s || (unsigned int) ul != ul)
 357                 return -1;
 358         *result = ul;
 359         return 0;
 360 }
 361
 362 #endif