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 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  25 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  26 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  27 #endif
  28 #define _ALL_SOURCE 1
  29 #define _GNU_SOURCE 1
  30 #define _BSD_SOURCE 1
  31
  32 #include <unistd.h>
  33 #include <stdio.h>
  34 #include <sys/stat.h>
  35 #include <fcntl.h>
  36 #include <stddef.h>
  37 #include <stdlib.h>
  38 #include <stdarg.h>
  39 #include <string.h>
  40 #include <errno.h>
  41 #include <limits.h>
  42 #include <sys/param.h>
  43 #include <sys/types.h>
  44 #include <dirent.h>
  45 #include <sys/time.h>
  46 #include <time.h>
  47 #include <signal.h>
  48 #include <sys/wait.h>
  49 #include <fnmatch.h>
  50 #include <sys/poll.h>
  51 #include <sys/socket.h>
  52 #include <assert.h>
  53 #include <regex.h>
  54 #include <netinet/in.h>
  55 #include <netinet/tcp.h>
  56 #include <arpa/inet.h>
  57 #include <netdb.h>
  58 #include <pwd.h>
  59 #include <inttypes.h>
  60 #if defined(__CYGWIN__)
  61 #undef _XOPEN_SOURCE
  62 #include <grp.h>
  63 #define _XOPEN_SOURCE 600
  64 #else
  65 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  66 #include <grp.h>
  67 #define _ALL_SOURCE 1
  68 #endif
  69
  70 #ifndef NO_ICONV
  71 #include <iconv.h>
  72 #endif
  73
  74 /* On most systems <limits.h> would have given us this, but
  75  * not on some systems (e.g. GNU/Hurd).
  76  */
  77 #ifndef PATH_MAX
  78 #define PATH_MAX 4096
  79 #endif
  80
  81 #ifndef PRIuMAX
  82 #define PRIuMAX "llu"
  83 #endif
  84
  85 #ifdef __GNUC__
  86 #define NORETURN __attribute__((__noreturn__))
  87 #else
  88 #define NORETURN
  89 #ifndef __attribute__
  90 #define __attribute__(x)
  91 #endif
  92 #endif
  93
  94 /* General helper functions */
  95 extern void usage(const char *err) NORETURN;
  96 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  97 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  98 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
  99
 100 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 101 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 102 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 103 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 104
 105 #ifdef NO_MMAP
 106
 107 #ifndef PROT_READ
 108 #define PROT_READ 1
 109 #define PROT_WRITE 2
 110 #define MAP_PRIVATE 1
 111 #define MAP_FAILED ((void*)-1)
 112 #endif
 113
 114 #define mmap git_mmap
 115 #define munmap git_munmap
 116 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 117 extern int git_munmap(void *start, size_t length);
 118
 119 /* This value must be multiple of (pagesize * 2) */
 120 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 121
 122 #else /* NO_MMAP */
 123
 124 #include <sys/mman.h>
 125
 126 /* This value must be multiple of (pagesize * 2) */
 127 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 128         (sizeof(void*) >= 8 \
 129                 ?  1 * 1024 * 1024 * 1024 \
 130                 : 32 * 1024 * 1024)
 131
 132 #endif /* NO_MMAP */
 133
 134 #define DEFAULT_PACKED_GIT_LIMIT \
 135         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 136
 137 #ifdef NO_PREAD
 138 #define pread git_pread
 139 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 140 #endif
 141
 142 #ifdef NO_SETENV
 143 #define setenv gitsetenv
 144 extern int gitsetenv(const char *, const char *, int);
 145 #endif
 146
 147 #ifdef NO_UNSETENV
 148 #define unsetenv gitunsetenv
 149 extern void gitunsetenv(const char *);
 150 #endif
 151
 152 #ifdef NO_STRCASESTR
 153 #define strcasestr gitstrcasestr
 154 extern char *gitstrcasestr(const char *haystack, const char *needle);
 155 #endif
 156
 157 #ifdef NO_STRLCPY
 158 #define strlcpy gitstrlcpy
 159 extern size_t gitstrlcpy(char *, const char *, size_t);
 160 #endif
 161
 162 #ifdef NO_STRTOUMAX
 163 #define strtoumax gitstrtoumax
 164 extern uintmax_t gitstrtoumax(const char *, char **, int);
 165 #endif
 166
 167 extern void release_pack_memory(size_t, int);
 168
 169 static inline char* xstrdup(const char *str)
 170 {
 171         char *ret = strdup(str);
 172         if (!ret) {
 173                 release_pack_memory(strlen(str) + 1, -1);
 174                 ret = strdup(str);
 175                 if (!ret)
 176                         die("Out of memory, strdup failed");
 177         }
 178         return ret;
 179 }
 180
 181 static inline void *xmalloc(size_t size)
 182 {
 183         void *ret = malloc(size);
 184         if (!ret && !size)
 185                 ret = malloc(1);
 186         if (!ret) {
 187                 release_pack_memory(size, -1);
 188                 ret = malloc(size);
 189                 if (!ret && !size)
 190                         ret = malloc(1);
 191                 if (!ret)
 192                         die("Out of memory, malloc failed");
 193         }
 194 #ifdef XMALLOC_POISON
 195         memset(ret, 0xA5, size);
 196 #endif
 197         return ret;
 198 }
 199
 200 static inline void *xrealloc(void *ptr, size_t size)
 201 {
 202         void *ret = realloc(ptr, size);
 203         if (!ret && !size)
 204                 ret = realloc(ptr, 1);
 205         if (!ret) {
 206                 release_pack_memory(size, -1);
 207                 ret = realloc(ptr, size);
 208                 if (!ret && !size)
 209                         ret = realloc(ptr, 1);
 210                 if (!ret)
 211                         die("Out of memory, realloc failed");
 212         }
 213         return ret;
 214 }
 215
 216 static inline void *xcalloc(size_t nmemb, size_t size)
 217 {
 218         void *ret = calloc(nmemb, size);
 219         if (!ret && (!nmemb || !size))
 220                 ret = calloc(1, 1);
 221         if (!ret) {
 222                 release_pack_memory(nmemb * size, -1);
 223                 ret = calloc(nmemb, size);
 224                 if (!ret && (!nmemb || !size))
 225                         ret = calloc(1, 1);
 226                 if (!ret)
 227                         die("Out of memory, calloc failed");
 228         }
 229         return ret;
 230 }
 231
 232 static inline void *xmmap(void *start, size_t length,
 233         int prot, int flags, int fd, off_t offset)
 234 {
 235         void *ret = mmap(start, length, prot, flags, fd, offset);
 236         if (ret == MAP_FAILED) {
 237                 if (!length)
 238                         return NULL;
 239                 release_pack_memory(length, fd);
 240                 ret = mmap(start, length, prot, flags, fd, offset);
 241                 if (ret == MAP_FAILED)
 242                         die("Out of memory? mmap failed: %s", strerror(errno));
 243         }
 244         return ret;
 245 }
 246
 247 static inline ssize_t xread(int fd, void *buf, size_t len)
 248 {
 249         ssize_t nr;
 250         while (1) {
 251                 nr = read(fd, buf, len);
 252                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 253                         continue;
 254                 return nr;
 255         }
 256 }
 257
 258 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 259 {
 260         ssize_t nr;
 261         while (1) {
 262                 nr = write(fd, buf, len);
 263                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 264                         continue;
 265                 return nr;
 266         }
 267 }
 268
 269 static inline size_t xsize_t(off_t len)
 270 {
 271         return (size_t)len;
 272 }
 273
 274 static inline int has_extension(const char *filename, const char *ext)
 275 {
 276         size_t len = strlen(filename);
 277         size_t extlen = strlen(ext);
 278         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 279 }
 280
 281 /* Sane ctype - no locale, and works with signed chars */
 282 #undef isspace
 283 #undef isdigit
 284 #undef isalpha
 285 #undef isalnum
 286 #undef tolower
 287 #undef toupper
 288 extern unsigned char sane_ctype[256];
 289 #define GIT_SPACE 0x01
 290 #define GIT_DIGIT 0x02
 291 #define GIT_ALPHA 0x04
 292 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 293 #define isspace(x) sane_istest(x,GIT_SPACE)
 294 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 295 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 296 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 297 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 298 #define toupper(x) sane_case((unsigned char)(x), 0)
 299
 300 static inline int sane_case(int x, int high)
 301 {
 302         if (sane_istest(x, GIT_ALPHA))
 303                 x = (x & ~0x20) | high;
 304         return x;
 305 }
 306
 307 static inline int prefixcmp(const char *str, const char *prefix)
 308 {
 309         return strncmp(str, prefix, strlen(prefix));
 310 }
 311
 312 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 313 {
 314         unsigned long ul;
 315         char *p;
 316
 317         errno = 0;
 318         ul = strtoul(s, &p, base);
 319         if (errno || *p || p == s || (unsigned int) ul != ul)
 320                 return -1;
 321         *result = ul;
 322         return 0;
 323 }
 324
 325 #endif