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 #ifdef NO_MEMMEM
 176 #define memmem gitmemmem
 177 void *gitmemmem(const void *haystack, size_t haystacklen,
 178                 const void *needle, size_t needlelen);
 179 #endif
 180
 181 extern void release_pack_memory(size_t, int);
 182
 183 static inline char* xstrdup(const char *str)
 184 {
 185         char *ret = strdup(str);
 186         if (!ret) {
 187                 release_pack_memory(strlen(str) + 1, -1);
 188                 ret = strdup(str);
 189                 if (!ret)
 190                         die("Out of memory, strdup failed");
 191         }
 192         return ret;
 193 }
 194
 195 static inline void *xmalloc(size_t size)
 196 {
 197         void *ret = malloc(size);
 198         if (!ret && !size)
 199                 ret = malloc(1);
 200         if (!ret) {
 201                 release_pack_memory(size, -1);
 202                 ret = malloc(size);
 203                 if (!ret && !size)
 204                         ret = malloc(1);
 205                 if (!ret)
 206                         die("Out of memory, malloc failed");
 207         }
 208 #ifdef XMALLOC_POISON
 209         memset(ret, 0xA5, size);
 210 #endif
 211         return ret;
 212 }
 213
 214 static inline void *xmemdupz(const void *data, size_t len)
 215 {
 216         char *p = xmalloc(len + 1);
 217         memcpy(p, data, len);
 218         p[len] = '\0';
 219         return p;
 220 }
 221
 222 static inline char *xstrndup(const char *str, size_t len)
 223 {
 224         char *p = memchr(str, '\0', len);
 225         return xmemdupz(str, p ? p - str : len);
 226 }
 227
 228 static inline void *xrealloc(void *ptr, size_t size)
 229 {
 230         void *ret = realloc(ptr, size);
 231         if (!ret && !size)
 232                 ret = realloc(ptr, 1);
 233         if (!ret) {
 234                 release_pack_memory(size, -1);
 235                 ret = realloc(ptr, size);
 236                 if (!ret && !size)
 237                         ret = realloc(ptr, 1);
 238                 if (!ret)
 239                         die("Out of memory, realloc failed");
 240         }
 241         return ret;
 242 }
 243
 244 static inline void *xcalloc(size_t nmemb, size_t size)
 245 {
 246         void *ret = calloc(nmemb, size);
 247         if (!ret && (!nmemb || !size))
 248                 ret = calloc(1, 1);
 249         if (!ret) {
 250                 release_pack_memory(nmemb * size, -1);
 251                 ret = calloc(nmemb, size);
 252                 if (!ret && (!nmemb || !size))
 253                         ret = calloc(1, 1);
 254                 if (!ret)
 255                         die("Out of memory, calloc failed");
 256         }
 257         return ret;
 258 }
 259
 260 static inline void *xmmap(void *start, size_t length,
 261         int prot, int flags, int fd, off_t offset)
 262 {
 263         void *ret = mmap(start, length, prot, flags, fd, offset);
 264         if (ret == MAP_FAILED) {
 265                 if (!length)
 266                         return NULL;
 267                 release_pack_memory(length, fd);
 268                 ret = mmap(start, length, prot, flags, fd, offset);
 269                 if (ret == MAP_FAILED)
 270                         die("Out of memory? mmap failed: %s", strerror(errno));
 271         }
 272         return ret;
 273 }
 274
 275 static inline ssize_t xread(int fd, void *buf, size_t len)
 276 {
 277         ssize_t nr;
 278         while (1) {
 279                 nr = read(fd, buf, len);
 280                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 281                         continue;
 282                 return nr;
 283         }
 284 }
 285
 286 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 287 {
 288         ssize_t nr;
 289         while (1) {
 290                 nr = write(fd, buf, len);
 291                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 292                         continue;
 293                 return nr;
 294         }
 295 }
 296
 297 static inline int xdup(int fd)
 298 {
 299         int ret = dup(fd);
 300         if (ret < 0)
 301                 die("dup failed: %s", strerror(errno));
 302         return ret;
 303 }
 304
 305 static inline FILE *xfdopen(int fd, const char *mode)
 306 {
 307         FILE *stream = fdopen(fd, mode);
 308         if (stream == NULL)
 309                 die("Out of memory? fdopen failed: %s", strerror(errno));
 310         return stream;
 311 }
 312
 313 static inline int xmkstemp(char *template)
 314 {
 315         int fd;
 316
 317         fd = mkstemp(template);
 318         if (fd < 0)
 319                 die("Unable to create temporary file: %s", strerror(errno));
 320         return fd;
 321 }
 322
 323 static inline size_t xsize_t(off_t len)
 324 {
 325         return (size_t)len;
 326 }
 327
 328 static inline int has_extension(const char *filename, const char *ext)
 329 {
 330         size_t len = strlen(filename);
 331         size_t extlen = strlen(ext);
 332         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 333 }
 334
 335 /* Sane ctype - no locale, and works with signed chars */
 336 #undef isspace
 337 #undef isdigit
 338 #undef isalpha
 339 #undef isalnum
 340 #undef tolower
 341 #undef toupper
 342 extern unsigned char sane_ctype[256];
 343 #define GIT_SPACE 0x01
 344 #define GIT_DIGIT 0x02
 345 #define GIT_ALPHA 0x04
 346 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 347 #define isspace(x) sane_istest(x,GIT_SPACE)
 348 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 349 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 350 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 351 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 352 #define toupper(x) sane_case((unsigned char)(x), 0)
 353
 354 static inline int sane_case(int x, int high)
 355 {
 356         if (sane_istest(x, GIT_ALPHA))
 357                 x = (x & ~0x20) | high;
 358         return x;
 359 }
 360
 361 static inline int prefixcmp(const char *str, const char *prefix)
 362 {
 363         return strncmp(str, prefix, strlen(prefix));
 364 }
 365
 366 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 367 {
 368         unsigned long ul;
 369         char *p;
 370
 371         errno = 0;
 372         ul = strtoul(s, &p, base);
 373         if (errno || *p || p == s || (unsigned int) ul != ul)
 374                 return -1;
 375         *result = ul;
 376         return 0;
 377 }
 378
 379 #endif