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 \
 101         (sizeof(void*) >= 8 \
 102                 ?  1 * 1024 * 1024 * 1024 \
 103                 : 32 * 1024 * 1024)
 104
 105 #endif /* NO_MMAP */
 106
 107 #define DEFAULT_PACKED_GIT_LIMIT \
 108         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 109
 110 #ifdef NO_PREAD
 111 #define pread git_pread
 112 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 113 #endif
 114
 115 #ifdef NO_SETENV
 116 #define setenv gitsetenv
 117 extern int gitsetenv(const char *, const char *, int);
 118 #endif
 119
 120 #ifdef NO_UNSETENV
 121 #define unsetenv gitunsetenv
 122 extern void gitunsetenv(const char *);
 123 #endif
 124
 125 #ifdef NO_STRCASESTR
 126 #define strcasestr gitstrcasestr
 127 extern char *gitstrcasestr(const char *haystack, const char *needle);
 128 #endif
 129
 130 #ifdef NO_STRLCPY
 131 #define strlcpy gitstrlcpy
 132 extern size_t gitstrlcpy(char *, const char *, size_t);
 133 #endif
 134
 135 extern void release_pack_memory(size_t);
 136
 137 static inline char* xstrdup(const char *str)
 138 {
 139         char *ret = strdup(str);
 140         if (!ret) {
 141                 release_pack_memory(strlen(str) + 1);
 142                 ret = strdup(str);
 143                 if (!ret)
 144                         die("Out of memory, strdup failed");
 145         }
 146         return ret;
 147 }
 148
 149 static inline void *xmalloc(size_t size)
 150 {
 151         void *ret = malloc(size);
 152         if (!ret && !size)
 153                 ret = malloc(1);
 154         if (!ret) {
 155                 release_pack_memory(size);
 156                 ret = malloc(size);
 157                 if (!ret && !size)
 158                         ret = malloc(1);
 159                 if (!ret)
 160                         die("Out of memory, malloc failed");
 161         }
 162 #ifdef XMALLOC_POISON
 163         memset(ret, 0xA5, size);
 164 #endif
 165         return ret;
 166 }
 167
 168 static inline void *xrealloc(void *ptr, size_t size)
 169 {
 170         void *ret = realloc(ptr, size);
 171         if (!ret && !size)
 172                 ret = realloc(ptr, 1);
 173         if (!ret) {
 174                 release_pack_memory(size);
 175                 ret = realloc(ptr, size);
 176                 if (!ret && !size)
 177                         ret = realloc(ptr, 1);
 178                 if (!ret)
 179                         die("Out of memory, realloc failed");
 180         }
 181         return ret;
 182 }
 183
 184 static inline void *xcalloc(size_t nmemb, size_t size)
 185 {
 186         void *ret = calloc(nmemb, size);
 187         if (!ret && (!nmemb || !size))
 188                 ret = calloc(1, 1);
 189         if (!ret) {
 190                 release_pack_memory(nmemb * size);
 191                 ret = calloc(nmemb, size);
 192                 if (!ret && (!nmemb || !size))
 193                         ret = calloc(1, 1);
 194                 if (!ret)
 195                         die("Out of memory, calloc failed");
 196         }
 197         return ret;
 198 }
 199
 200 static inline void *xmmap(void *start, size_t length,
 201         int prot, int flags, int fd, off_t offset)
 202 {
 203         void *ret = mmap(start, length, prot, flags, fd, offset);
 204         if (ret == MAP_FAILED) {
 205                 if (!length)
 206                         return NULL;
 207                 release_pack_memory(length);
 208                 ret = mmap(start, length, prot, flags, fd, offset);
 209                 if (ret == MAP_FAILED)
 210                         die("Out of memory? mmap failed: %s", strerror(errno));
 211         }
 212         return ret;
 213 }
 214
 215 static inline ssize_t xread(int fd, void *buf, size_t len)
 216 {
 217         ssize_t nr;
 218         while (1) {
 219                 nr = read(fd, buf, len);
 220                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 221                         continue;
 222                 return nr;
 223         }
 224 }
 225
 226 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 227 {
 228         ssize_t nr;
 229         while (1) {
 230                 nr = write(fd, buf, len);
 231                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 232                         continue;
 233                 return nr;
 234         }
 235 }
 236
 237 static inline int has_extension(const char *filename, const char *ext)
 238 {
 239         size_t len = strlen(filename);
 240         size_t extlen = strlen(ext);
 241         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 242 }
 243
 244 /* Sane ctype - no locale, and works with signed chars */
 245 #undef isspace
 246 #undef isdigit
 247 #undef isalpha
 248 #undef isalnum
 249 #undef tolower
 250 #undef toupper
 251 extern unsigned char sane_ctype[256];
 252 #define GIT_SPACE 0x01
 253 #define GIT_DIGIT 0x02
 254 #define GIT_ALPHA 0x04
 255 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 256 #define isspace(x) sane_istest(x,GIT_SPACE)
 257 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 258 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 259 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 260 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 261 #define toupper(x) sane_case((unsigned char)(x), 0)
 262
 263 static inline int sane_case(int x, int high)
 264 {
 265         if (sane_istest(x, GIT_ALPHA))
 266                 x = (x & ~0x20) | high;
 267         return x;
 268 }
 269
 270 #endif