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__)  && !defined(__USLC__) && !defined(_M_UNIX)
  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 <fnmatch.h>
  67 #include <assert.h>
  68 #include <regex.h>
  69 #include <utime.h>
  70 #ifndef __MINGW32__
  71 #include <sys/wait.h>
  72 #include <sys/poll.h>
  73 #include <sys/socket.h>
  74 #include <sys/ioctl.h>
  75 #ifndef NO_SYS_SELECT_H
  76 #include <sys/select.h>
  77 #endif
  78 #include <netinet/in.h>
  79 #include <netinet/tcp.h>
  80 #include <arpa/inet.h>
  81 #include <netdb.h>
  82 #include <pwd.h>
  83 #include <inttypes.h>
  84 #if defined(__CYGWIN__)
  85 #undef _XOPEN_SOURCE
  86 #include <grp.h>
  87 #define _XOPEN_SOURCE 600
  88 #else
  89 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  90 #include <grp.h>
  91 #define _ALL_SOURCE 1
  92 #endif
  93 #else   /* __MINGW32__ */
  94 /* pull in Windows compatibility stuff */
  95 #include "compat/mingw.h"
  96 #endif  /* __MINGW32__ */
  97
  98 #ifndef NO_ICONV
  99 #include <iconv.h>
 100 #endif
 101
 102 /* On most systems <limits.h> would have given us this, but
 103  * not on some systems (e.g. GNU/Hurd).
 104  */
 105 #ifndef PATH_MAX
 106 #define PATH_MAX 4096
 107 #endif
 108
 109 #ifndef PRIuMAX
 110 #define PRIuMAX "llu"
 111 #endif
 112
 113 #ifndef PATH_SEP
 114 #define PATH_SEP ':'
 115 #endif
 116
 117 #ifdef __GNUC__
 118 #define NORETURN __attribute__((__noreturn__))
 119 #else
 120 #define NORETURN
 121 #ifndef __attribute__
 122 #define __attribute__(x)
 123 #endif
 124 #endif
 125
 126 /* General helper functions */
 127 extern void usage(const char *err) NORETURN;
 128 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 129 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 130 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 131
 132 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 133 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 134 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 135 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 136
 137 extern int prefixcmp(const char *str, const char *prefix);
 138
 139 #ifdef NO_MMAP
 140
 141 #ifndef PROT_READ
 142 #define PROT_READ 1
 143 #define PROT_WRITE 2
 144 #define MAP_PRIVATE 1
 145 #define MAP_FAILED ((void*)-1)
 146 #endif
 147
 148 #define mmap git_mmap
 149 #define munmap git_munmap
 150 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 151 extern int git_munmap(void *start, size_t length);
 152
 153 /* This value must be multiple of (pagesize * 2) */
 154 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 155
 156 #else /* NO_MMAP */
 157
 158 #include <sys/mman.h>
 159
 160 /* This value must be multiple of (pagesize * 2) */
 161 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 162         (sizeof(void*) >= 8 \
 163                 ?  1 * 1024 * 1024 * 1024 \
 164                 : 32 * 1024 * 1024)
 165
 166 #endif /* NO_MMAP */
 167
 168 #define DEFAULT_PACKED_GIT_LIMIT \
 169         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 170
 171 #ifdef NO_PREAD
 172 #define pread git_pread
 173 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 174 #endif
 175
 176 #ifdef NO_SETENV
 177 #define setenv gitsetenv
 178 extern int gitsetenv(const char *, const char *, int);
 179 #endif
 180
 181 #ifdef NO_MKDTEMP
 182 #define mkdtemp gitmkdtemp
 183 extern char *gitmkdtemp(char *);
 184 #endif
 185
 186 #ifdef NO_UNSETENV
 187 #define unsetenv gitunsetenv
 188 extern void gitunsetenv(const char *);
 189 #endif
 190
 191 #ifdef NO_STRCASESTR
 192 #define strcasestr gitstrcasestr
 193 extern char *gitstrcasestr(const char *haystack, const char *needle);
 194 #endif
 195
 196 #ifdef NO_STRLCPY
 197 #define strlcpy gitstrlcpy
 198 extern size_t gitstrlcpy(char *, const char *, size_t);
 199 #endif
 200
 201 #ifdef NO_STRTOUMAX
 202 #define strtoumax gitstrtoumax
 203 extern uintmax_t gitstrtoumax(const char *, char **, int);
 204 #endif
 205
 206 #ifdef NO_HSTRERROR
 207 #define hstrerror githstrerror
 208 extern const char *githstrerror(int herror);
 209 #endif
 210
 211 #ifdef NO_MEMMEM
 212 #define memmem gitmemmem
 213 void *gitmemmem(const void *haystack, size_t haystacklen,
 214                 const void *needle, size_t needlelen);
 215 #endif
 216
 217 #ifdef FREAD_READS_DIRECTORIES
 218 #ifdef fopen
 219 #undef fopen
 220 #endif
 221 #define fopen(a,b) git_fopen(a,b)
 222 extern FILE *git_fopen(const char*, const char*);
 223 #endif
 224
 225 #ifdef SNPRINTF_RETURNS_BOGUS
 226 #define snprintf git_snprintf
 227 extern int git_snprintf(char *str, size_t maxsize,
 228                         const char *format, ...);
 229 #define vsnprintf git_vsnprintf
 230 extern int git_vsnprintf(char *str, size_t maxsize,
 231                          const char *format, va_list ap);
 232 #endif
 233
 234 #ifdef __GLIBC_PREREQ
 235 #if __GLIBC_PREREQ(2, 1)
 236 #define HAVE_STRCHRNUL
 237 #endif
 238 #endif
 239
 240 #ifndef HAVE_STRCHRNUL
 241 #define strchrnul gitstrchrnul
 242 static inline char *gitstrchrnul(const char *s, int c)
 243 {
 244         while (*s && *s != c)
 245                 s++;
 246         return (char *)s;
 247 }
 248 #endif
 249
 250 extern void release_pack_memory(size_t, int);
 251
 252 static inline char* xstrdup(const char *str)
 253 {
 254         char *ret = strdup(str);
 255         if (!ret) {
 256                 release_pack_memory(strlen(str) + 1, -1);
 257                 ret = strdup(str);
 258                 if (!ret)
 259                         die("Out of memory, strdup failed");
 260         }
 261         return ret;
 262 }
 263
 264 static inline void *xmalloc(size_t size)
 265 {
 266         void *ret = malloc(size);
 267         if (!ret && !size)
 268                 ret = malloc(1);
 269         if (!ret) {
 270                 release_pack_memory(size, -1);
 271                 ret = malloc(size);
 272                 if (!ret && !size)
 273                         ret = malloc(1);
 274                 if (!ret)
 275                         die("Out of memory, malloc failed");
 276         }
 277 #ifdef XMALLOC_POISON
 278         memset(ret, 0xA5, size);
 279 #endif
 280         return ret;
 281 }
 282
 283 /*
 284  * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
 285  * "data" to the allocated memory, zero terminates the allocated memory,
 286  * and returns a pointer to the allocated memory. If the allocation fails,
 287  * the program dies.
 288  */
 289 static inline void *xmemdupz(const void *data, size_t len)
 290 {
 291         char *p = xmalloc(len + 1);
 292         memcpy(p, data, len);
 293         p[len] = '\0';
 294         return p;
 295 }
 296
 297 static inline char *xstrndup(const char *str, size_t len)
 298 {
 299         char *p = memchr(str, '\0', len);
 300         return xmemdupz(str, p ? p - str : len);
 301 }
 302
 303 static inline void *xrealloc(void *ptr, size_t size)
 304 {
 305         void *ret = realloc(ptr, size);
 306         if (!ret && !size)
 307                 ret = realloc(ptr, 1);
 308         if (!ret) {
 309                 release_pack_memory(size, -1);
 310                 ret = realloc(ptr, size);
 311                 if (!ret && !size)
 312                         ret = realloc(ptr, 1);
 313                 if (!ret)
 314                         die("Out of memory, realloc failed");
 315         }
 316         return ret;
 317 }
 318
 319 static inline void *xcalloc(size_t nmemb, size_t size)
 320 {
 321         void *ret = calloc(nmemb, size);
 322         if (!ret && (!nmemb || !size))
 323                 ret = calloc(1, 1);
 324         if (!ret) {
 325                 release_pack_memory(nmemb * size, -1);
 326                 ret = calloc(nmemb, size);
 327                 if (!ret && (!nmemb || !size))
 328                         ret = calloc(1, 1);
 329                 if (!ret)
 330                         die("Out of memory, calloc failed");
 331         }
 332         return ret;
 333 }
 334
 335 static inline void *xmmap(void *start, size_t length,
 336         int prot, int flags, int fd, off_t offset)
 337 {
 338         void *ret = mmap(start, length, prot, flags, fd, offset);
 339         if (ret == MAP_FAILED) {
 340                 if (!length)
 341                         return NULL;
 342                 release_pack_memory(length, fd);
 343                 ret = mmap(start, length, prot, flags, fd, offset);
 344                 if (ret == MAP_FAILED)
 345                         die("Out of memory? mmap failed: %s", strerror(errno));
 346         }
 347         return ret;
 348 }
 349
 350 /*
 351  * xread() is the same a read(), but it automatically restarts read()
 352  * operations with a recoverable error (EAGAIN and EINTR). xread()
 353  * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
 354  */
 355 static inline ssize_t xread(int fd, void *buf, size_t len)
 356 {
 357         ssize_t nr;
 358         while (1) {
 359                 nr = read(fd, buf, len);
 360                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 361                         continue;
 362                 return nr;
 363         }
 364 }
 365
 366 /*
 367  * xwrite() is the same a write(), but it automatically restarts write()
 368  * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
 369  * GUARANTEE that "len" bytes is written even if the operation is successful.
 370  */
 371 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 372 {
 373         ssize_t nr;
 374         while (1) {
 375                 nr = write(fd, buf, len);
 376                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 377                         continue;
 378                 return nr;
 379         }
 380 }
 381
 382 static inline int xdup(int fd)
 383 {
 384         int ret = dup(fd);
 385         if (ret < 0)
 386                 die("dup failed: %s", strerror(errno));
 387         return ret;
 388 }
 389
 390 static inline FILE *xfdopen(int fd, const char *mode)
 391 {
 392         FILE *stream = fdopen(fd, mode);
 393         if (stream == NULL)
 394                 die("Out of memory? fdopen failed: %s", strerror(errno));
 395         return stream;
 396 }
 397
 398 static inline int xmkstemp(char *template)
 399 {
 400         int fd;
 401
 402         fd = mkstemp(template);
 403         if (fd < 0)
 404                 die("Unable to create temporary file: %s", strerror(errno));
 405         return fd;
 406 }
 407
 408 static inline size_t xsize_t(off_t len)
 409 {
 410         return (size_t)len;
 411 }
 412
 413 static inline int has_extension(const char *filename, const char *ext)
 414 {
 415         size_t len = strlen(filename);
 416         size_t extlen = strlen(ext);
 417         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 418 }
 419
 420 /* Sane ctype - no locale, and works with signed chars */
 421 #undef isspace
 422 #undef isdigit
 423 #undef isalpha
 424 #undef isalnum
 425 #undef tolower
 426 #undef toupper
 427 extern unsigned char sane_ctype[256];
 428 #define GIT_SPACE 0x01
 429 #define GIT_DIGIT 0x02
 430 #define GIT_ALPHA 0x04
 431 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 432 #define isspace(x) sane_istest(x,GIT_SPACE)
 433 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 434 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 435 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 436 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 437 #define toupper(x) sane_case((unsigned char)(x), 0)
 438
 439 static inline int sane_case(int x, int high)
 440 {
 441         if (sane_istest(x, GIT_ALPHA))
 442                 x = (x & ~0x20) | high;
 443         return x;
 444 }
 445
 446 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 447 {
 448         unsigned long ul;
 449         char *p;
 450
 451         errno = 0;
 452         ul = strtoul(s, &p, base);
 453         if (errno || *p || p == s || (unsigned int) ul != ul)
 454                 return -1;
 455         *result = ul;
 456         return 0;
 457 }
 458
 459 static inline int strtol_i(char const *s, int base, int *result)
 460 {
 461         long ul;
 462         char *p;
 463
 464         errno = 0;
 465         ul = strtol(s, &p, base);
 466         if (errno || *p || p == s || (int) ul != ul)
 467                 return -1;
 468         *result = ul;
 469         return 0;
 470 }
 471
 472 #ifdef INTERNAL_QSORT
 473 void git_qsort(void *base, size_t nmemb, size_t size,
 474                int(*compar)(const void *, const void *));
 475 #define qsort git_qsort
 476 #endif
 477
 478 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 479 # define FORCE_DIR_SET_GID S_ISGID
 480 #else
 481 # define FORCE_DIR_SET_GID 0
 482 #endif
 483
 484 #endif