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 _ALL_SOURCE 1
  19#define _GNU_SOURCE 1
  20#define _BSD_SOURCE 1
  21
  22#include <unistd.h>
  23#include <stdio.h>
  24#include <sys/stat.h>
  25#include <fcntl.h>
  26#include <stddef.h>
  27#include <stdlib.h>
  28#include <stdarg.h>
  29#include <string.h>
  30#include <errno.h>
  31#include <limits.h>
  32#include <sys/param.h>
  33#include <sys/types.h>
  34#include <dirent.h>
  35#include <sys/time.h>
  36#include <time.h>
  37#include <signal.h>
  38#include <sys/wait.h>
  39#include <fnmatch.h>
  40#include <sys/poll.h>
  41#include <sys/socket.h>
  42#include <assert.h>
  43#include <regex.h>
  44#include <netinet/in.h>
  45#include <netinet/tcp.h>
  46#include <arpa/inet.h>
  47#include <netdb.h>
  48#include <pwd.h>
  49#include <inttypes.h>
  50#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  51#include <grp.h>
  52#define _ALL_SOURCE 1
  53
  54#ifndef NO_ICONV
  55#include <iconv.h>
  56#endif
  57
  58/* On most systems <limits.h> would have given us this, but
  59 * not on some systems (e.g. GNU/Hurd).
  60 */
  61#ifndef PATH_MAX
  62#define PATH_MAX 4096
  63#endif
  64
  65#ifdef __GNUC__
  66#define NORETURN __attribute__((__noreturn__))
  67#else
  68#define NORETURN
  69#ifndef __attribute__
  70#define __attribute__(x)
  71#endif
  72#endif
  73
  74/* General helper functions */
  75extern void usage(const char *err) NORETURN;
  76extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  77extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  78extern void warn(const char *err, ...) __attribute__((format (printf, 1, 2)));
  79
  80extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  81extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  82extern void set_error_routine(void (*routine)(const char *err, va_list params));
  83extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  84
  85#ifdef NO_MMAP
  86
  87#ifndef PROT_READ
  88#define PROT_READ 1
  89#define PROT_WRITE 2
  90#define MAP_PRIVATE 1
  91#define MAP_FAILED ((void*)-1)
  92#endif
  93
  94#define mmap git_mmap
  95#define munmap git_munmap
  96extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
  97extern int git_munmap(void *start, size_t length);
  98
  99#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 100
 101#else /* NO_MMAP */
 102
 103#include <sys/mman.h>
 104#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 105        (sizeof(void*) >= 8 \
 106                ?  1 * 1024 * 1024 * 1024 \
 107                : 32 * 1024 * 1024)
 108
 109#endif /* NO_MMAP */
 110
 111#define DEFAULT_PACKED_GIT_LIMIT \
 112        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 113
 114#ifdef NO_PREAD
 115#define pread git_pread
 116extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 117#endif
 118
 119#ifdef NO_SETENV
 120#define setenv gitsetenv
 121extern int gitsetenv(const char *, const char *, int);
 122#endif
 123
 124#ifdef NO_UNSETENV
 125#define unsetenv gitunsetenv
 126extern void gitunsetenv(const char *);
 127#endif
 128
 129#ifdef NO_STRCASESTR
 130#define strcasestr gitstrcasestr
 131extern char *gitstrcasestr(const char *haystack, const char *needle);
 132#endif
 133
 134#ifdef NO_STRLCPY
 135#define strlcpy gitstrlcpy
 136extern size_t gitstrlcpy(char *, const char *, size_t);
 137#endif
 138
 139extern void release_pack_memory(size_t);
 140
 141static inline char* xstrdup(const char *str)
 142{
 143        char *ret = strdup(str);
 144        if (!ret) {
 145                release_pack_memory(strlen(str) + 1);
 146                ret = strdup(str);
 147                if (!ret)
 148                        die("Out of memory, strdup failed");
 149        }
 150        return ret;
 151}
 152
 153static inline void *xmalloc(size_t size)
 154{
 155        void *ret = malloc(size);
 156        if (!ret && !size)
 157                ret = malloc(1);
 158        if (!ret) {
 159                release_pack_memory(size);
 160                ret = malloc(size);
 161                if (!ret && !size)
 162                        ret = malloc(1);
 163                if (!ret)
 164                        die("Out of memory, malloc failed");
 165        }
 166#ifdef XMALLOC_POISON
 167        memset(ret, 0xA5, size);
 168#endif
 169        return ret;
 170}
 171
 172static inline void *xrealloc(void *ptr, size_t size)
 173{
 174        void *ret = realloc(ptr, size);
 175        if (!ret && !size)
 176                ret = realloc(ptr, 1);
 177        if (!ret) {
 178                release_pack_memory(size);
 179                ret = realloc(ptr, size);
 180                if (!ret && !size)
 181                        ret = realloc(ptr, 1);
 182                if (!ret)
 183                        die("Out of memory, realloc failed");
 184        }
 185        return ret;
 186}
 187
 188static inline void *xcalloc(size_t nmemb, size_t size)
 189{
 190        void *ret = calloc(nmemb, size);
 191        if (!ret && (!nmemb || !size))
 192                ret = calloc(1, 1);
 193        if (!ret) {
 194                release_pack_memory(nmemb * size);
 195                ret = calloc(nmemb, size);
 196                if (!ret && (!nmemb || !size))
 197                        ret = calloc(1, 1);
 198                if (!ret)
 199                        die("Out of memory, calloc failed");
 200        }
 201        return ret;
 202}
 203
 204static inline void *xmmap(void *start, size_t length,
 205        int prot, int flags, int fd, off_t offset)
 206{
 207        void *ret = mmap(start, length, prot, flags, fd, offset);
 208        if (ret == MAP_FAILED) {
 209                if (!length)
 210                        return NULL;
 211                release_pack_memory(length);
 212                ret = mmap(start, length, prot, flags, fd, offset);
 213                if (ret == MAP_FAILED)
 214                        die("Out of memory? mmap failed: %s", strerror(errno));
 215        }
 216        return ret;
 217}
 218
 219static inline ssize_t xread(int fd, void *buf, size_t len)
 220{
 221        ssize_t nr;
 222        while (1) {
 223                nr = read(fd, buf, len);
 224                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 225                        continue;
 226                return nr;
 227        }
 228}
 229
 230static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 231{
 232        ssize_t nr;
 233        while (1) {
 234                nr = write(fd, buf, len);
 235                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 236                        continue;
 237                return nr;
 238        }
 239}
 240
 241static inline int has_extension(const char *filename, const char *ext)
 242{
 243        size_t len = strlen(filename);
 244        size_t extlen = strlen(ext);
 245        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 246}
 247
 248/* Sane ctype - no locale, and works with signed chars */
 249#undef isspace
 250#undef isdigit
 251#undef isalpha
 252#undef isalnum
 253#undef tolower
 254#undef toupper
 255extern unsigned char sane_ctype[256];
 256#define GIT_SPACE 0x01
 257#define GIT_DIGIT 0x02
 258#define GIT_ALPHA 0x04
 259#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 260#define isspace(x) sane_istest(x,GIT_SPACE)
 261#define isdigit(x) sane_istest(x,GIT_DIGIT)
 262#define isalpha(x) sane_istest(x,GIT_ALPHA)
 263#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 264#define tolower(x) sane_case((unsigned char)(x), 0x20)
 265#define toupper(x) sane_case((unsigned char)(x), 0)
 266
 267static inline int sane_case(int x, int high)
 268{
 269        if (sane_istest(x, GIT_ALPHA))
 270                x = (x & ~0x20) | high;
 271        return x;
 272}
 273
 274#endif