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 <sys/ioctl.h>
  56 #include <sys/select.h>
  57 #include <assert.h>
  58 #include <regex.h>
  59 #include <netinet/in.h>
  60 #include <netinet/tcp.h>
  61 #include <arpa/inet.h>
  62 #include <netdb.h>
  63 #include <pwd.h>
  64 #include <inttypes.h>
  65 #if defined(__CYGWIN__)
  66 #undef _XOPEN_SOURCE
  67 #include <grp.h>
  68 #define _XOPEN_SOURCE 600
  69 #else
  70 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  71 #include <grp.h>
  72 #define _ALL_SOURCE 1
  73 #endif
  74
  75 #ifndef NO_ICONV
  76 #include <iconv.h>
  77 #endif
  78
  79 /* On most systems <limits.h> would have given us this, but
  80  * not on some systems (e.g. GNU/Hurd).
  81  */
  82 #ifndef PATH_MAX
  83 #define PATH_MAX 4096
  84 #endif
  85
  86 #ifndef PRIuMAX
  87 #define PRIuMAX "llu"
  88 #endif
  89
  90 #ifdef __GNUC__
  91 #define NORETURN __attribute__((__noreturn__))
  92 #else
  93 #define NORETURN
  94 #ifndef __attribute__
  95 #define __attribute__(x)
  96 #endif
  97 #endif
  98
  99 /* General helper functions */
 100 extern void usage(const char *err) NORETURN;
 101 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 102 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 103 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 104
 105 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 106 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 107 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 108 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 109
 110 #ifdef NO_MMAP
 111
 112 #ifndef PROT_READ
 113 #define PROT_READ 1
 114 #define PROT_WRITE 2
 115 #define MAP_PRIVATE 1
 116 #define MAP_FAILED ((void*)-1)
 117 #endif
 118
 119 #define mmap git_mmap
 120 #define munmap git_munmap
 121 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 122 extern int git_munmap(void *start, size_t length);
 123
 124 /* This value must be multiple of (pagesize * 2) */
 125 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 126
 127 #else /* NO_MMAP */
 128
 129 #include <sys/mman.h>
 130
 131 /* This value must be multiple of (pagesize * 2) */
 132 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 133         (sizeof(void*) >= 8 \
 134                 ?  1 * 1024 * 1024 * 1024 \
 135                 : 32 * 1024 * 1024)
 136
 137 #endif /* NO_MMAP */
 138
 139 #define DEFAULT_PACKED_GIT_LIMIT \
 140         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 141
 142 #ifdef NO_PREAD
 143 #define pread git_pread
 144 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 145 #endif
 146
 147 #ifdef NO_SETENV
 148 #define setenv gitsetenv
 149 extern int gitsetenv(const char *, const char *, int);
 150 #endif
 151
 152 #ifdef NO_MKDTEMP
 153 #define mkdtemp gitmkdtemp
 154 extern char *gitmkdtemp(char *);
 155 #endif
 156
 157 #ifdef NO_UNSETENV
 158 #define unsetenv gitunsetenv
 159 extern void gitunsetenv(const char *);
 160 #endif
 161
 162 #ifdef NO_STRCASESTR
 163 #define strcasestr gitstrcasestr
 164 extern char *gitstrcasestr(const char *haystack, const char *needle);
 165 #endif
 166
 167 #ifdef NO_STRLCPY
 168 #define strlcpy gitstrlcpy
 169 extern size_t gitstrlcpy(char *, const char *, size_t);
 170 #endif
 171
 172 #ifdef NO_STRTOUMAX
 173 #define strtoumax gitstrtoumax
 174 extern uintmax_t gitstrtoumax(const char *, char **, int);
 175 #endif
 176
 177 #ifdef NO_HSTRERROR
 178 #define hstrerror githstrerror
 179 extern const char *githstrerror(int herror);
 180 #endif
 181
 182 #ifdef NO_MEMMEM
 183 #define memmem gitmemmem
 184 void *gitmemmem(const void *haystack, size_t haystacklen,
 185                 const void *needle, size_t needlelen);
 186 #endif
 187
 188 #ifdef __GLIBC_PREREQ
 189 #if __GLIBC_PREREQ(2, 1)
 190 #define HAVE_STRCHRNUL
 191 #endif
 192 #endif
 193
 194 #ifndef HAVE_STRCHRNUL
 195 #define strchrnul gitstrchrnul
 196 static inline char *gitstrchrnul(const char *s, int c)
 197 {
 198         while (*s && *s != c)
 199                 s++;
 200         return (char *)s;
 201 }
 202 #endif
 203
 204 extern void release_pack_memory(size_t, int);
 205
 206 static inline char* xstrdup(const char *str)
 207 {
 208         char *ret = strdup(str);
 209         if (!ret) {
 210                 release_pack_memory(strlen(str) + 1, -1);
 211                 ret = strdup(str);
 212                 if (!ret)
 213                         die("Out of memory, strdup failed");
 214         }
 215         return ret;
 216 }
 217
 218 static inline void *xmalloc(size_t size)
 219 {
 220         void *ret = malloc(size);
 221         if (!ret && !size)
 222                 ret = malloc(1);
 223         if (!ret) {
 224                 release_pack_memory(size, -1);
 225                 ret = malloc(size);
 226                 if (!ret && !size)
 227                         ret = malloc(1);
 228                 if (!ret)
 229                         die("Out of memory, malloc failed");
 230         }
 231 #ifdef XMALLOC_POISON
 232         memset(ret, 0xA5, size);
 233 #endif
 234         return ret;
 235 }
 236
 237 static inline void *xmemdupz(const void *data, size_t len)
 238 {
 239         char *p = xmalloc(len + 1);
 240         memcpy(p, data, len);
 241         p[len] = '\0';
 242         return p;
 243 }
 244
 245 static inline char *xstrndup(const char *str, size_t len)
 246 {
 247         char *p = memchr(str, '\0', len);
 248         return xmemdupz(str, p ? p - str : len);
 249 }
 250
 251 static inline void *xrealloc(void *ptr, size_t size)
 252 {
 253         void *ret = realloc(ptr, size);
 254         if (!ret && !size)
 255                 ret = realloc(ptr, 1);
 256         if (!ret) {
 257                 release_pack_memory(size, -1);
 258                 ret = realloc(ptr, size);
 259                 if (!ret && !size)
 260                         ret = realloc(ptr, 1);
 261                 if (!ret)
 262                         die("Out of memory, realloc failed");
 263         }
 264         return ret;
 265 }
 266
 267 static inline void *xcalloc(size_t nmemb, size_t size)
 268 {
 269         void *ret = calloc(nmemb, size);
 270         if (!ret && (!nmemb || !size))
 271                 ret = calloc(1, 1);
 272         if (!ret) {
 273                 release_pack_memory(nmemb * size, -1);
 274                 ret = calloc(nmemb, size);
 275                 if (!ret && (!nmemb || !size))
 276                         ret = calloc(1, 1);
 277                 if (!ret)
 278                         die("Out of memory, calloc failed");
 279         }
 280         return ret;
 281 }
 282
 283 static inline void *xmmap(void *start, size_t length,
 284         int prot, int flags, int fd, off_t offset)
 285 {
 286         void *ret = mmap(start, length, prot, flags, fd, offset);
 287         if (ret == MAP_FAILED) {
 288                 if (!length)
 289                         return NULL;
 290                 release_pack_memory(length, fd);
 291                 ret = mmap(start, length, prot, flags, fd, offset);
 292                 if (ret == MAP_FAILED)
 293                         die("Out of memory? mmap failed: %s", strerror(errno));
 294         }
 295         return ret;
 296 }
 297
 298 static inline ssize_t xread(int fd, void *buf, size_t len)
 299 {
 300         ssize_t nr;
 301         while (1) {
 302                 nr = read(fd, buf, len);
 303                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 304                         continue;
 305                 return nr;
 306         }
 307 }
 308
 309 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 310 {
 311         ssize_t nr;
 312         while (1) {
 313                 nr = write(fd, buf, len);
 314                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 315                         continue;
 316                 return nr;
 317         }
 318 }
 319
 320 static inline int xdup(int fd)
 321 {
 322         int ret = dup(fd);
 323         if (ret < 0)
 324                 die("dup failed: %s", strerror(errno));
 325         return ret;
 326 }
 327
 328 static inline FILE *xfdopen(int fd, const char *mode)
 329 {
 330         FILE *stream = fdopen(fd, mode);
 331         if (stream == NULL)
 332                 die("Out of memory? fdopen failed: %s", strerror(errno));
 333         return stream;
 334 }
 335
 336 static inline int xmkstemp(char *template)
 337 {
 338         int fd;
 339
 340         fd = mkstemp(template);
 341         if (fd < 0)
 342                 die("Unable to create temporary file: %s", strerror(errno));
 343         return fd;
 344 }
 345
 346 static inline size_t xsize_t(off_t len)
 347 {
 348         return (size_t)len;
 349 }
 350
 351 static inline int has_extension(const char *filename, const char *ext)
 352 {
 353         size_t len = strlen(filename);
 354         size_t extlen = strlen(ext);
 355         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 356 }
 357
 358 /* Sane ctype - no locale, and works with signed chars */
 359 #undef isspace
 360 #undef isdigit
 361 #undef isalpha
 362 #undef isalnum
 363 #undef tolower
 364 #undef toupper
 365 extern unsigned char sane_ctype[256];
 366 #define GIT_SPACE 0x01
 367 #define GIT_DIGIT 0x02
 368 #define GIT_ALPHA 0x04
 369 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 370 #define isspace(x) sane_istest(x,GIT_SPACE)
 371 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 372 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 373 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 374 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 375 #define toupper(x) sane_case((unsigned char)(x), 0)
 376
 377 static inline int sane_case(int x, int high)
 378 {
 379         if (sane_istest(x, GIT_ALPHA))
 380                 x = (x & ~0x20) | high;
 381         return x;
 382 }
 383
 384 static inline int prefixcmp(const char *str, const char *prefix)
 385 {
 386         return strncmp(str, prefix, strlen(prefix));
 387 }
 388
 389 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 390 {
 391         unsigned long ul;
 392         char *p;
 393
 394         errno = 0;
 395         ul = strtoul(s, &p, base);
 396         if (errno || *p || p == s || (unsigned int) ul != ul)
 397                 return -1;
 398         *result = ul;
 399         return 0;
 400 }
 401
 402 static inline int strtol_i(char const *s, int base, int *result)
 403 {
 404         long ul;
 405         char *p;
 406
 407         errno = 0;
 408         ul = strtol(s, &p, base);
 409         if (errno || *p || p == s || (int) ul != ul)
 410                 return -1;
 411         *result = ul;
 412         return 0;
 413 }
 414
 415 #endif