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