Andrew's git - gitweb.git/blob

   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 */
  71extern void usage(const char *err) NORETURN;
  72extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  73extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  74extern void warn(const char *err, ...) __attribute__((format (printf, 1, 2)));
  75
  76extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  77extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  78extern void set_error_routine(void (*routine)(const char *err, va_list params));
  79extern 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
  92extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
  93extern 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        (sizeof(void*) >= 8 \
 109                ?   8 * 1024 * 1024 * 1024 \
 110                : 256 * 1024 * 1024)
 111
 112#ifdef NO_SETENV
 113#define setenv gitsetenv
 114extern int gitsetenv(const char *, const char *, int);
 115#endif
 116
 117#ifdef NO_UNSETENV
 118#define unsetenv gitunsetenv
 119extern void gitunsetenv(const char *);
 120#endif
 121
 122#ifdef NO_STRCASESTR
 123#define strcasestr gitstrcasestr
 124extern char *gitstrcasestr(const char *haystack, const char *needle);
 125#endif
 126
 127#ifdef NO_STRLCPY
 128#define strlcpy gitstrlcpy
 129extern size_t gitstrlcpy(char *, const char *, size_t);
 130#endif
 131
 132extern void release_pack_memory(size_t);
 133
 134static inline char* xstrdup(const char *str)
 135{
 136        char *ret = strdup(str);
 137        if (!ret) {
 138                release_pack_memory(strlen(str) + 1);
 139                ret = strdup(str);
 140                if (!ret)
 141                        die("Out of memory, strdup failed");
 142        }
 143        return ret;
 144}
 145
 146static inline void *xmalloc(size_t size)
 147{
 148        void *ret = malloc(size);
 149        if (!ret && !size)
 150                ret = malloc(1);
 151        if (!ret) {
 152                release_pack_memory(size);
 153                ret = malloc(size);
 154                if (!ret && !size)
 155                        ret = malloc(1);
 156                if (!ret)
 157                        die("Out of memory, malloc failed");
 158        }
 159#ifdef XMALLOC_POISON
 160        memset(ret, 0xA5, size);
 161#endif
 162        return ret;
 163}
 164
 165static inline void *xrealloc(void *ptr, size_t size)
 166{
 167        void *ret = realloc(ptr, size);
 168        if (!ret && !size)
 169                ret = realloc(ptr, 1);
 170        if (!ret) {
 171                release_pack_memory(size);
 172                ret = realloc(ptr, size);
 173                if (!ret && !size)
 174                        ret = realloc(ptr, 1);
 175                if (!ret)
 176                        die("Out of memory, realloc failed");
 177        }
 178        return ret;
 179}
 180
 181static inline void *xcalloc(size_t nmemb, size_t size)
 182{
 183        void *ret = calloc(nmemb, size);
 184        if (!ret && (!nmemb || !size))
 185                ret = calloc(1, 1);
 186        if (!ret) {
 187                release_pack_memory(nmemb * size);
 188                ret = calloc(nmemb, size);
 189                if (!ret && (!nmemb || !size))
 190                        ret = calloc(1, 1);
 191                if (!ret)
 192                        die("Out of memory, calloc failed");
 193        }
 194        return ret;
 195}
 196
 197static inline void *xmmap(void *start, size_t length,
 198        int prot, int flags, int fd, off_t offset)
 199{
 200        void *ret = mmap(start, length, prot, flags, fd, offset);
 201        if (ret == MAP_FAILED) {
 202                release_pack_memory(length);
 203                ret = mmap(start, length, prot, flags, fd, offset);
 204                if (ret == MAP_FAILED)
 205                        die("Out of memory? mmap failed: %s", strerror(errno));
 206        }
 207        return ret;
 208}
 209
 210static inline ssize_t xread(int fd, void *buf, size_t len)
 211{
 212        ssize_t nr;
 213        while (1) {
 214                nr = read(fd, buf, len);
 215                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 216                        continue;
 217                return nr;
 218        }
 219}
 220
 221static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 222{
 223        ssize_t nr;
 224        while (1) {
 225                nr = write(fd, buf, len);
 226                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 227                        continue;
 228                return nr;
 229        }
 230}
 231
 232static inline int has_extension(const char *filename, const char *ext)
 233{
 234        size_t len = strlen(filename);
 235        size_t extlen = strlen(ext);
 236        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 237}
 238
 239/* Sane ctype - no locale, and works with signed chars */
 240#undef isspace
 241#undef isdigit
 242#undef isalpha
 243#undef isalnum
 244#undef tolower
 245#undef toupper
 246extern unsigned char sane_ctype[256];
 247#define GIT_SPACE 0x01
 248#define GIT_DIGIT 0x02
 249#define GIT_ALPHA 0x04
 250#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 251#define isspace(x) sane_istest(x,GIT_SPACE)
 252#define isdigit(x) sane_istest(x,GIT_DIGIT)
 253#define isalpha(x) sane_istest(x,GIT_ALPHA)
 254#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 255#define tolower(x) sane_case((unsigned char)(x), 0x20)
 256#define toupper(x) sane_case((unsigned char)(x), 0)
 257
 258static inline int sane_case(int x, int high)
 259{
 260        if (sane_istest(x, GIT_ALPHA))
 261                x = (x & ~0x20) | high;
 262        return x;
 263}
 264
 265#endif