git-compat-util.h

   1 #ifndef GIT_COMPAT_UTIL_H
   2 #define GIT_COMPAT_UTIL_H
   3
   4 #ifndef FLEX_ARRAY
   5 #if defined(__GNUC__) && (__GNUC__ < 3)
   6 #define FLEX_ARRAY 0
   7 #else
   8 #define FLEX_ARRAY /* empty */
   9 #endif
  10 #endif
  11
  12 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  13
  14 #if !defined(__APPLE__) && !defined(__FreeBSD__)
  15 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  16 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  17 #endif
  18 #define _ALL_SOURCE 1
  19 #define _GNU_SOURCE 1
  20 #define _BSD_SOURCE 1
  21
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <sys/stat.h>
  25 #include <fcntl.h>
  26 #include <stddef.h>
  27 #include <stdlib.h>
  28 #include <stdarg.h>
  29 #include <string.h>
  30 #include <errno.h>
  31 #include <limits.h>
  32 #include <sys/param.h>
  33 #include <sys/types.h>
  34 #include <dirent.h>
  35 #include <sys/time.h>
  36 #include <time.h>
  37 #include <signal.h>
  38 #include <sys/wait.h>
  39 #include <fnmatch.h>
  40 #include <sys/poll.h>
  41 #include <sys/socket.h>
  42 #include <assert.h>
  43 #include <regex.h>
  44 #include <netinet/in.h>
  45 #include <netinet/tcp.h>
  46 #include <arpa/inet.h>
  47 #include <netdb.h>
  48 #include <pwd.h>
  49 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  50 #include <grp.h>
  51 #define _ALL_SOURCE 1
  52
  53 #ifndef NO_ICONV
  54 #include <iconv.h>
  55 #endif
  56
  57 /* On most systems <limits.h> would have given us this, but
  58  * not on some systems (e.g. GNU/Hurd).
  59  */
  60 #ifndef PATH_MAX
  61 #define PATH_MAX 4096
  62 #endif
  63
  64 #ifdef __GNUC__
  65 #define NORETURN __attribute__((__noreturn__))
  66 #else
  67 #define NORETURN
  68 #ifndef __attribute__
  69 #define __attribute__(x)
  70 #endif
  71 #endif
  72
  73 /* General helper functions */
  74 extern void usage(const char *err) NORETURN;
  75 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  76 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  77 extern void warn(const char *err, ...) __attribute__((format (printf, 1, 2)));
  78
  79 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  80 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  81 extern void set_error_routine(void (*routine)(const char *err, va_list params));
  82 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  83
  84 #ifdef NO_MMAP
  85
  86 #ifndef PROT_READ
  87 #define PROT_READ 1
  88 #define PROT_WRITE 2
  89 #define MAP_PRIVATE 1
  90 #define MAP_FAILED ((void*)-1)
  91 #endif
  92
  93 #define mmap git_mmap
  94 #define munmap git_munmap
  95 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
  96 extern int git_munmap(void *start, size_t length);
  97
  98 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
  99
 100 #else /* NO_MMAP */
 101
 102 #include <sys/mman.h>
 103 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 104         (sizeof(void*) >= 8 \
 105                 ?  1 * 1024 * 1024 * 1024 \
 106                 : 32 * 1024 * 1024)
 107
 108 #endif /* NO_MMAP */
 109
 110 #define DEFAULT_PACKED_GIT_LIMIT \
 111         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 112
 113 #ifdef NO_PREAD
 114 #define pread git_pread
 115 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 116 #endif
 117
 118 #ifdef NO_SETENV
 119 #define setenv gitsetenv
 120 extern int gitsetenv(const char *, const char *, int);
 121 #endif
 122
 123 #ifdef NO_UNSETENV
 124 #define unsetenv gitunsetenv
 125 extern void gitunsetenv(const char *);
 126 #endif
 127
 128 #ifdef NO_STRCASESTR
 129 #define strcasestr gitstrcasestr
 130 extern char *gitstrcasestr(const char *haystack, const char *needle);
 131 #endif
 132
 133 #ifdef NO_STRLCPY
 134 #define strlcpy gitstrlcpy
 135 extern size_t gitstrlcpy(char *, const char *, size_t);
 136 #endif
 137
 138 extern void release_pack_memory(size_t);
 139
 140 static inline char* xstrdup(const char *str)
 141 {
 142         char *ret = strdup(str);
 143         if (!ret) {
 144                 release_pack_memory(strlen(str) + 1);
 145                 ret = strdup(str);
 146                 if (!ret)
 147                         die("Out of memory, strdup failed");
 148         }
 149         return ret;
 150 }
 151
 152 static inline void *xmalloc(size_t size)
 153 {
 154         void *ret = malloc(size);
 155         if (!ret && !size)
 156                 ret = malloc(1);
 157         if (!ret) {
 158                 release_pack_memory(size);
 159                 ret = malloc(size);
 160                 if (!ret && !size)
 161                         ret = malloc(1);
 162                 if (!ret)
 163                         die("Out of memory, malloc failed");
 164         }
 165 #ifdef XMALLOC_POISON
 166         memset(ret, 0xA5, size);
 167 #endif
 168         return ret;
 169 }
 170
 171 static inline void *xrealloc(void *ptr, size_t size)
 172 {
 173         void *ret = realloc(ptr, size);
 174         if (!ret && !size)
 175                 ret = realloc(ptr, 1);
 176         if (!ret) {
 177                 release_pack_memory(size);
 178                 ret = realloc(ptr, size);
 179                 if (!ret && !size)
 180                         ret = realloc(ptr, 1);
 181                 if (!ret)
 182                         die("Out of memory, realloc failed");
 183         }
 184         return ret;
 185 }
 186
 187 static inline void *xcalloc(size_t nmemb, size_t size)
 188 {
 189         void *ret = calloc(nmemb, size);
 190         if (!ret && (!nmemb || !size))
 191                 ret = calloc(1, 1);
 192         if (!ret) {
 193                 release_pack_memory(nmemb * size);
 194                 ret = calloc(nmemb, size);
 195                 if (!ret && (!nmemb || !size))
 196                         ret = calloc(1, 1);
 197                 if (!ret)
 198                         die("Out of memory, calloc failed");
 199         }
 200         return ret;
 201 }
 202
 203 static inline void *xmmap(void *start, size_t length,
 204         int prot, int flags, int fd, off_t offset)
 205 {
 206         void *ret = mmap(start, length, prot, flags, fd, offset);
 207         if (ret == MAP_FAILED) {
 208                 if (!length)
 209                         return NULL;
 210                 release_pack_memory(length);
 211                 ret = mmap(start, length, prot, flags, fd, offset);
 212                 if (ret == MAP_FAILED)
 213                         die("Out of memory? mmap failed: %s", strerror(errno));
 214         }
 215         return ret;
 216 }
 217
 218 static inline ssize_t xread(int fd, void *buf, size_t len)
 219 {
 220         ssize_t nr;
 221         while (1) {
 222                 nr = read(fd, buf, len);
 223                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 224                         continue;
 225                 return nr;
 226         }
 227 }
 228
 229 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 230 {
 231         ssize_t nr;
 232         while (1) {
 233                 nr = write(fd, buf, len);
 234                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 235                         continue;
 236                 return nr;
 237         }
 238 }
 239
 240 static inline int has_extension(const char *filename, const char *ext)
 241 {
 242         size_t len = strlen(filename);
 243         size_t extlen = strlen(ext);
 244         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 245 }
 246
 247 /* Sane ctype - no locale, and works with signed chars */
 248 #undef isspace
 249 #undef isdigit
 250 #undef isalpha
 251 #undef isalnum
 252 #undef tolower
 253 #undef toupper
 254 extern unsigned char sane_ctype[256];
 255 #define GIT_SPACE 0x01
 256 #define GIT_DIGIT 0x02
 257 #define GIT_ALPHA 0x04
 258 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 259 #define isspace(x) sane_istest(x,GIT_SPACE)
 260 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 261 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 262 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 263 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 264 #define toupper(x) sane_case((unsigned char)(x), 0)
 265
 266 static inline int sane_case(int x, int high)
 267 {
 268         if (sane_istest(x, GIT_ALPHA))
 269                 x = (x & ~0x20) | high;
 270         return x;
 271 }
 272
 273 #endif