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 #ifndef NO_SYS_SELECT_H
  72 #include <sys/select.h>
  73 #endif
  74 #include <assert.h>
  75 #include <regex.h>
  76 #include <netinet/in.h>
  77 #include <netinet/tcp.h>
  78 #include <arpa/inet.h>
  79 #include <netdb.h>
  80 #include <pwd.h>
  81 #include <inttypes.h>
  82 #if defined(__CYGWIN__)
  83 #undef _XOPEN_SOURCE
  84 #include <grp.h>
  85 #define _XOPEN_SOURCE 600
  86 #else
  87 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  88 #include <grp.h>
  89 #define _ALL_SOURCE 1
  90 #endif
  91
  92 #ifndef NO_ICONV
  93 #include <iconv.h>
  94 #endif
  95
  96 /* On most systems <limits.h> would have given us this, but
  97  * not on some systems (e.g. GNU/Hurd).
  98  */
  99 #ifndef PATH_MAX
 100 #define PATH_MAX 4096
 101 #endif
 102
 103 #ifndef PRIuMAX
 104 #define PRIuMAX "llu"
 105 #endif
 106
 107 #ifdef __GNUC__
 108 #define NORETURN __attribute__((__noreturn__))
 109 #else
 110 #define NORETURN
 111 #ifndef __attribute__
 112 #define __attribute__(x)
 113 #endif
 114 #endif
 115
 116 /* General helper functions */
 117 extern void usage(const char *err) NORETURN;
 118 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 119 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 120 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 121
 122 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 123 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 124 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 125 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 126
 127 extern int prefixcmp(const char *str, const char *prefix);
 128
 129 #ifdef NO_MMAP
 130
 131 #ifndef PROT_READ
 132 #define PROT_READ 1
 133 #define PROT_WRITE 2
 134 #define MAP_PRIVATE 1
 135 #define MAP_FAILED ((void*)-1)
 136 #endif
 137
 138 #define mmap git_mmap
 139 #define munmap git_munmap
 140 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 141 extern int git_munmap(void *start, size_t length);
 142
 143 /* This value must be multiple of (pagesize * 2) */
 144 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 145
 146 #else /* NO_MMAP */
 147
 148 #include <sys/mman.h>
 149
 150 /* This value must be multiple of (pagesize * 2) */
 151 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 152         (sizeof(void*) >= 8 \
 153                 ?  1 * 1024 * 1024 * 1024 \
 154                 : 32 * 1024 * 1024)
 155
 156 #endif /* NO_MMAP */
 157
 158 #define DEFAULT_PACKED_GIT_LIMIT \
 159         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 160
 161 #ifdef NO_PREAD
 162 #define pread git_pread
 163 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 164 #endif
 165
 166 #ifdef NO_SETENV
 167 #define setenv gitsetenv
 168 extern int gitsetenv(const char *, const char *, int);
 169 #endif
 170
 171 #ifdef NO_MKDTEMP
 172 #define mkdtemp gitmkdtemp
 173 extern char *gitmkdtemp(char *);
 174 #endif
 175
 176 #ifdef NO_UNSETENV
 177 #define unsetenv gitunsetenv
 178 extern void gitunsetenv(const char *);
 179 #endif
 180
 181 #ifdef NO_STRCASESTR
 182 #define strcasestr gitstrcasestr
 183 extern char *gitstrcasestr(const char *haystack, const char *needle);
 184 #endif
 185
 186 #ifdef NO_STRLCPY
 187 #define strlcpy gitstrlcpy
 188 extern size_t gitstrlcpy(char *, const char *, size_t);
 189 #endif
 190
 191 #ifdef NO_STRTOUMAX
 192 #define strtoumax gitstrtoumax
 193 extern uintmax_t gitstrtoumax(const char *, char **, int);
 194 #endif
 195
 196 #ifdef NO_HSTRERROR
 197 #define hstrerror githstrerror
 198 extern const char *githstrerror(int herror);
 199 #endif
 200
 201 #ifdef NO_MEMMEM
 202 #define memmem gitmemmem
 203 void *gitmemmem(const void *haystack, size_t haystacklen,
 204                 const void *needle, size_t needlelen);
 205 #endif
 206
 207 #ifdef FREAD_READS_DIRECTORIES
 208 #define fopen(a,b) git_fopen(a,b)
 209 extern FILE *git_fopen(const char*, const char*);
 210 #endif
 211
 212 #ifdef __GLIBC_PREREQ
 213 #if __GLIBC_PREREQ(2, 1)
 214 #define HAVE_STRCHRNUL
 215 #endif
 216 #endif
 217
 218 #ifndef HAVE_STRCHRNUL
 219 #define strchrnul gitstrchrnul
 220 static inline char *gitstrchrnul(const char *s, int c)
 221 {
 222         while (*s && *s != c)
 223                 s++;
 224         return (char *)s;
 225 }
 226 #endif
 227
 228 extern void release_pack_memory(size_t, int);
 229
 230 static inline char* xstrdup(const char *str)
 231 {
 232         char *ret = strdup(str);
 233         if (!ret) {
 234                 release_pack_memory(strlen(str) + 1, -1);
 235                 ret = strdup(str);
 236                 if (!ret)
 237                         die("Out of memory, strdup failed");
 238         }
 239         return ret;
 240 }
 241
 242 static inline void *xmalloc(size_t size)
 243 {
 244         void *ret = malloc(size);
 245         if (!ret && !size)
 246                 ret = malloc(1);
 247         if (!ret) {
 248                 release_pack_memory(size, -1);
 249                 ret = malloc(size);
 250                 if (!ret && !size)
 251                         ret = malloc(1);
 252                 if (!ret)
 253                         die("Out of memory, malloc failed");
 254         }
 255 #ifdef XMALLOC_POISON
 256         memset(ret, 0xA5, size);
 257 #endif
 258         return ret;
 259 }
 260
 261 static inline void *xmemdupz(const void *data, size_t len)
 262 {
 263         char *p = xmalloc(len + 1);
 264         memcpy(p, data, len);
 265         p[len] = '\0';
 266         return p;
 267 }
 268
 269 static inline char *xstrndup(const char *str, size_t len)
 270 {
 271         char *p = memchr(str, '\0', len);
 272         return xmemdupz(str, p ? p - str : len);
 273 }
 274
 275 static inline void *xrealloc(void *ptr, size_t size)
 276 {
 277         void *ret = realloc(ptr, size);
 278         if (!ret && !size)
 279                 ret = realloc(ptr, 1);
 280         if (!ret) {
 281                 release_pack_memory(size, -1);
 282                 ret = realloc(ptr, size);
 283                 if (!ret && !size)
 284                         ret = realloc(ptr, 1);
 285                 if (!ret)
 286                         die("Out of memory, realloc failed");
 287         }
 288         return ret;
 289 }
 290
 291 static inline void *xcalloc(size_t nmemb, size_t size)
 292 {
 293         void *ret = calloc(nmemb, size);
 294         if (!ret && (!nmemb || !size))
 295                 ret = calloc(1, 1);
 296         if (!ret) {
 297                 release_pack_memory(nmemb * size, -1);
 298                 ret = calloc(nmemb, size);
 299                 if (!ret && (!nmemb || !size))
 300                         ret = calloc(1, 1);
 301                 if (!ret)
 302                         die("Out of memory, calloc failed");
 303         }
 304         return ret;
 305 }
 306
 307 static inline void *xmmap(void *start, size_t length,
 308         int prot, int flags, int fd, off_t offset)
 309 {
 310         void *ret = mmap(start, length, prot, flags, fd, offset);
 311         if (ret == MAP_FAILED) {
 312                 if (!length)
 313                         return NULL;
 314                 release_pack_memory(length, fd);
 315                 ret = mmap(start, length, prot, flags, fd, offset);
 316                 if (ret == MAP_FAILED)
 317                         die("Out of memory? mmap failed: %s", strerror(errno));
 318         }
 319         return ret;
 320 }
 321
 322 static inline ssize_t xread(int fd, void *buf, size_t len)
 323 {
 324         ssize_t nr;
 325         while (1) {
 326                 nr = read(fd, buf, len);
 327                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 328                         continue;
 329                 return nr;
 330         }
 331 }
 332
 333 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 334 {
 335         ssize_t nr;
 336         while (1) {
 337                 nr = write(fd, buf, len);
 338                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 339                         continue;
 340                 return nr;
 341         }
 342 }
 343
 344 static inline int xdup(int fd)
 345 {
 346         int ret = dup(fd);
 347         if (ret < 0)
 348                 die("dup failed: %s", strerror(errno));
 349         return ret;
 350 }
 351
 352 static inline FILE *xfdopen(int fd, const char *mode)
 353 {
 354         FILE *stream = fdopen(fd, mode);
 355         if (stream == NULL)
 356                 die("Out of memory? fdopen failed: %s", strerror(errno));
 357         return stream;
 358 }
 359
 360 static inline int xmkstemp(char *template)
 361 {
 362         int fd;
 363
 364         fd = mkstemp(template);
 365         if (fd < 0)
 366                 die("Unable to create temporary file: %s", strerror(errno));
 367         return fd;
 368 }
 369
 370 static inline size_t xsize_t(off_t len)
 371 {
 372         return (size_t)len;
 373 }
 374
 375 static inline int has_extension(const char *filename, const char *ext)
 376 {
 377         size_t len = strlen(filename);
 378         size_t extlen = strlen(ext);
 379         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 380 }
 381
 382 /* Sane ctype - no locale, and works with signed chars */
 383 #undef isspace
 384 #undef isdigit
 385 #undef isalpha
 386 #undef isalnum
 387 #undef tolower
 388 #undef toupper
 389 extern unsigned char sane_ctype[256];
 390 #define GIT_SPACE 0x01
 391 #define GIT_DIGIT 0x02
 392 #define GIT_ALPHA 0x04
 393 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 394 #define isspace(x) sane_istest(x,GIT_SPACE)
 395 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 396 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 397 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 398 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 399 #define toupper(x) sane_case((unsigned char)(x), 0)
 400
 401 static inline int sane_case(int x, int high)
 402 {
 403         if (sane_istest(x, GIT_ALPHA))
 404                 x = (x & ~0x20) | high;
 405         return x;
 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 #ifdef INTERNAL_QSORT
 435 void git_qsort(void *base, size_t nmemb, size_t size,
 436                int(*compar)(const void *, const void *));
 437 #define qsort git_qsort
 438 #endif
 439
 440 #endif