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