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 (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
 108extern int gitsetenv(const char *, const char *, int);
 109#endif
 110
 111#ifdef NO_UNSETENV
 112#define unsetenv gitunsetenv
 113extern void gitunsetenv(const char *);
 114#endif
 115
 116#ifdef NO_STRCASESTR
 117#define strcasestr gitstrcasestr
 118extern char *gitstrcasestr(const char *haystack, const char *needle);
 119#endif
 120
 121#ifdef NO_STRLCPY
 122#define strlcpy gitstrlcpy
 123extern size_t gitstrlcpy(char *, const char *, size_t);
 124#endif
 125
 126extern void release_pack_memory(size_t);
 127
 128static 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
 140static 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
 159static 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
 175static 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
 191static 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
 204static 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
 215static 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
 226static 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
 240extern 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
 252static 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