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 /*
   8  * See if our compiler is known to support flexible array members.
   9  */
  10 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
  11 # define FLEX_ARRAY /* empty */
  12 #elif defined(__GNUC__)
  13 # if (__GNUC__ >= 3)
  14 #  define FLEX_ARRAY /* empty */
  15 # else
  16 #  define FLEX_ARRAY 0 /* older GNU extension */
  17 # endif
  18 #endif
  19
  20 /*
  21  * Otherwise, default to safer but a bit wasteful traditional style
  22  */
  23 #ifndef FLEX_ARRAY
  24 # define FLEX_ARRAY 1
  25 #endif
  26 #endif
  27
  28 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  29
  30 #ifdef __GNUC__
  31 #define TYPEOF(x) (__typeof__(x))
  32 #else
  33 #define TYPEOF(x)
  34 #endif
  35
  36 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
  37 #define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  38
  39 /* Approximation of the length of the decimal representation of this type. */
  40 #define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  41
  42 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  43 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  44 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  45 #endif
  46 #define _ALL_SOURCE 1
  47 #define _GNU_SOURCE 1
  48 #define _BSD_SOURCE 1
  49
  50 #include <unistd.h>
  51 #include <stdio.h>
  52 #include <sys/stat.h>
  53 #include <fcntl.h>
  54 #include <stddef.h>
  55 #include <stdlib.h>
  56 #include <stdarg.h>
  57 #include <string.h>
  58 #include <errno.h>
  59 #include <limits.h>
  60 #include <sys/param.h>
  61 #include <sys/types.h>
  62 #include <dirent.h>
  63 #include <sys/time.h>
  64 #include <time.h>
  65 #include <signal.h>
  66 #include <sys/wait.h>
  67 #include <fnmatch.h>
  68 #include <sys/poll.h>
  69 #include <sys/socket.h>
  70 #include <sys/ioctl.h>
  71 #include <sys/select.h>
  72 #include <assert.h>
  73 #include <regex.h>
  74 #include <netinet/in.h>
  75 #include <netinet/tcp.h>
  76 #include <arpa/inet.h>
  77 #include <netdb.h>
  78 #include <pwd.h>
  79 #include <inttypes.h>
  80 #if defined(__CYGWIN__)
  81 #undef _XOPEN_SOURCE
  82 #include <grp.h>
  83 #define _XOPEN_SOURCE 600
  84 #else
  85 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  86 #include <grp.h>
  87 #define _ALL_SOURCE 1
  88 #endif
  89
  90 #ifndef NO_ICONV
  91 #include <iconv.h>
  92 #endif
  93
  94 /* On most systems <limits.h> would have given us this, but
  95  * not on some systems (e.g. GNU/Hurd).
  96  */
  97 #ifndef PATH_MAX
  98 #define PATH_MAX 4096
  99 #endif
 100
 101 #ifndef PRIuMAX
 102 #define PRIuMAX "llu"
 103 #endif
 104
 105 #ifdef __GNUC__
 106 #define NORETURN __attribute__((__noreturn__))
 107 #else
 108 #define NORETURN
 109 #ifndef __attribute__
 110 #define __attribute__(x)
 111 #endif
 112 #endif
 113
 114 /* General helper functions */
 115 extern void usage(const char *err) NORETURN;
 116 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 117 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 118 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 119
 120 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 121 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 122 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 123 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 124
 125 #ifdef NO_MMAP
 126
 127 #ifndef PROT_READ
 128 #define PROT_READ 1
 129 #define PROT_WRITE 2
 130 #define MAP_PRIVATE 1
 131 #define MAP_FAILED ((void*)-1)
 132 #endif
 133
 134 #define mmap git_mmap
 135 #define munmap git_munmap
 136 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 137 extern int git_munmap(void *start, size_t length);
 138
 139 /* This value must be multiple of (pagesize * 2) */
 140 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 141
 142 #else /* NO_MMAP */
 143
 144 #include <sys/mman.h>
 145
 146 /* This value must be multiple of (pagesize * 2) */
 147 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 148         (sizeof(void*) >= 8 \
 149                 ?  1 * 1024 * 1024 * 1024 \
 150                 : 32 * 1024 * 1024)
 151
 152 #endif /* NO_MMAP */
 153
 154 #define DEFAULT_PACKED_GIT_LIMIT \
 155         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 156
 157 #ifdef NO_PREAD
 158 #define pread git_pread
 159 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 160 #endif
 161
 162 #ifdef NO_SETENV
 163 #define setenv gitsetenv
 164 extern int gitsetenv(const char *, const char *, int);
 165 #endif
 166
 167 #ifdef NO_MKDTEMP
 168 #define mkdtemp gitmkdtemp
 169 extern char *gitmkdtemp(char *);
 170 #endif
 171
 172 #ifdef NO_UNSETENV
 173 #define unsetenv gitunsetenv
 174 extern void gitunsetenv(const char *);
 175 #endif
 176
 177 #ifdef NO_STRCASESTR
 178 #define strcasestr gitstrcasestr
 179 extern char *gitstrcasestr(const char *haystack, const char *needle);
 180 #endif
 181
 182 #ifdef NO_STRLCPY
 183 #define strlcpy gitstrlcpy
 184 extern size_t gitstrlcpy(char *, const char *, size_t);
 185 #endif
 186
 187 #ifdef NO_STRTOUMAX
 188 #define strtoumax gitstrtoumax
 189 extern uintmax_t gitstrtoumax(const char *, char **, int);
 190 #endif
 191
 192 #ifdef NO_HSTRERROR
 193 #define hstrerror githstrerror
 194 extern const char *githstrerror(int herror);
 195 #endif
 196
 197 #ifdef NO_MEMMEM
 198 #define memmem gitmemmem
 199 void *gitmemmem(const void *haystack, size_t haystacklen,
 200                 const void *needle, size_t needlelen);
 201 #endif
 202
 203 #ifdef __GLIBC_PREREQ
 204 #if __GLIBC_PREREQ(2, 1)
 205 #define HAVE_STRCHRNUL
 206 #endif
 207 #endif
 208
 209 #ifndef HAVE_STRCHRNUL
 210 #define strchrnul gitstrchrnul
 211 static inline char *gitstrchrnul(const char *s, int c)
 212 {
 213         while (*s && *s != c)
 214                 s++;
 215         return (char *)s;
 216 }
 217 #endif
 218
 219 extern void release_pack_memory(size_t, int);
 220
 221 static inline char* xstrdup(const char *str)
 222 {
 223         char *ret = strdup(str);
 224         if (!ret) {
 225                 release_pack_memory(strlen(str) + 1, -1);
 226                 ret = strdup(str);
 227                 if (!ret)
 228                         die("Out of memory, strdup failed");
 229         }
 230         return ret;
 231 }
 232
 233 static inline void *xmalloc(size_t size)
 234 {
 235         void *ret = malloc(size);
 236         if (!ret && !size)
 237                 ret = malloc(1);
 238         if (!ret) {
 239                 release_pack_memory(size, -1);
 240                 ret = malloc(size);
 241                 if (!ret && !size)
 242                         ret = malloc(1);
 243                 if (!ret)
 244                         die("Out of memory, malloc failed");
 245         }
 246 #ifdef XMALLOC_POISON
 247         memset(ret, 0xA5, size);
 248 #endif
 249         return ret;
 250 }
 251
 252 static inline void *xmemdupz(const void *data, size_t len)
 253 {
 254         char *p = xmalloc(len + 1);
 255         memcpy(p, data, len);
 256         p[len] = '\0';
 257         return p;
 258 }
 259
 260 static inline char *xstrndup(const char *str, size_t len)
 261 {
 262         char *p = memchr(str, '\0', len);
 263         return xmemdupz(str, p ? p - str : len);
 264 }
 265
 266 static inline void *xrealloc(void *ptr, size_t size)
 267 {
 268         void *ret = realloc(ptr, size);
 269         if (!ret && !size)
 270                 ret = realloc(ptr, 1);
 271         if (!ret) {
 272                 release_pack_memory(size, -1);
 273                 ret = realloc(ptr, size);
 274                 if (!ret && !size)
 275                         ret = realloc(ptr, 1);
 276                 if (!ret)
 277                         die("Out of memory, realloc failed");
 278         }
 279         return ret;
 280 }
 281
 282 static inline void *xcalloc(size_t nmemb, size_t size)
 283 {
 284         void *ret = calloc(nmemb, size);
 285         if (!ret && (!nmemb || !size))
 286                 ret = calloc(1, 1);
 287         if (!ret) {
 288                 release_pack_memory(nmemb * size, -1);
 289                 ret = calloc(nmemb, size);
 290                 if (!ret && (!nmemb || !size))
 291                         ret = calloc(1, 1);
 292                 if (!ret)
 293                         die("Out of memory, calloc failed");
 294         }
 295         return ret;
 296 }
 297
 298 static inline void *xmmap(void *start, size_t length,
 299         int prot, int flags, int fd, off_t offset)
 300 {
 301         void *ret = mmap(start, length, prot, flags, fd, offset);
 302         if (ret == MAP_FAILED) {
 303                 if (!length)
 304                         return NULL;
 305                 release_pack_memory(length, fd);
 306                 ret = mmap(start, length, prot, flags, fd, offset);
 307                 if (ret == MAP_FAILED)
 308                         die("Out of memory? mmap failed: %s", strerror(errno));
 309         }
 310         return ret;
 311 }
 312
 313 static inline ssize_t xread(int fd, void *buf, size_t len)
 314 {
 315         ssize_t nr;
 316         while (1) {
 317                 nr = read(fd, buf, len);
 318                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 319                         continue;
 320                 return nr;
 321         }
 322 }
 323
 324 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 325 {
 326         ssize_t nr;
 327         while (1) {
 328                 nr = write(fd, buf, len);
 329                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 330                         continue;
 331                 return nr;
 332         }
 333 }
 334
 335 static inline int xdup(int fd)
 336 {
 337         int ret = dup(fd);
 338         if (ret < 0)
 339                 die("dup failed: %s", strerror(errno));
 340         return ret;
 341 }
 342
 343 static inline FILE *xfdopen(int fd, const char *mode)
 344 {
 345         FILE *stream = fdopen(fd, mode);
 346         if (stream == NULL)
 347                 die("Out of memory? fdopen failed: %s", strerror(errno));
 348         return stream;
 349 }
 350
 351 static inline int xmkstemp(char *template)
 352 {
 353         int fd;
 354
 355         fd = mkstemp(template);
 356         if (fd < 0)
 357                 die("Unable to create temporary file: %s", strerror(errno));
 358         return fd;
 359 }
 360
 361 static inline size_t xsize_t(off_t len)
 362 {
 363         return (size_t)len;
 364 }
 365
 366 static inline int has_extension(const char *filename, const char *ext)
 367 {
 368         size_t len = strlen(filename);
 369         size_t extlen = strlen(ext);
 370         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 371 }
 372
 373 /* Sane ctype - no locale, and works with signed chars */
 374 #undef isspace
 375 #undef isdigit
 376 #undef isalpha
 377 #undef isalnum
 378 #undef tolower
 379 #undef toupper
 380 extern unsigned char sane_ctype[256];
 381 #define GIT_SPACE 0x01
 382 #define GIT_DIGIT 0x02
 383 #define GIT_ALPHA 0x04
 384 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 385 #define isspace(x) sane_istest(x,GIT_SPACE)
 386 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 387 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 388 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 389 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 390 #define toupper(x) sane_case((unsigned char)(x), 0)
 391
 392 static inline int sane_case(int x, int high)
 393 {
 394         if (sane_istest(x, GIT_ALPHA))
 395                 x = (x & ~0x20) | high;
 396         return x;
 397 }
 398
 399 static inline int prefixcmp(const char *str, const char *prefix)
 400 {
 401         for (; ; str++, prefix++)
 402                 if (!*prefix)
 403                         return 0;
 404                 else if (*str != *prefix)
 405                         return (unsigned char)*prefix - (unsigned char)*str;
 406 }
 407
 408 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 409 {
 410         unsigned long ul;
 411         char *p;
 412
 413         errno = 0;
 414         ul = strtoul(s, &p, base);
 415         if (errno || *p || p == s || (unsigned int) ul != ul)
 416                 return -1;
 417         *result = ul;
 418         return 0;
 419 }
 420
 421 static inline int strtol_i(char const *s, int base, int *result)
 422 {
 423         long ul;
 424         char *p;
 425
 426         errno = 0;
 427         ul = strtol(s, &p, base);
 428         if (errno || *p || p == s || (int) ul != ul)
 429                 return -1;
 430         *result = ul;
 431         return 0;
 432 }
 433
 434 #endif