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        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 109
 110#ifdef NO_PREAD
 111#define pread git_pread
 112extern 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
 117extern int gitsetenv(const char *, const char *, int);
 118#endif
 119
 120#ifdef NO_UNSETENV
 121#define unsetenv gitunsetenv
 122extern void gitunsetenv(const char *);
 123#endif
 124
 125#ifdef NO_STRCASESTR
 126#define strcasestr gitstrcasestr
 127extern char *gitstrcasestr(const char *haystack, const char *needle);
 128#endif
 129
 130#ifdef NO_STRLCPY
 131#define strlcpy gitstrlcpy
 132extern size_t gitstrlcpy(char *, const char *, size_t);
 133#endif
 134
 135extern void release_pack_memory(size_t);
 136
 137static 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
 149static 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
 168static 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
 184static 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
 200static 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
 215static 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
 226static 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
 237static 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
 251extern 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
 263static 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