Andrew's git - gitweb.git/blob

105ac28f9766cb8800fcf6071fd94ed0e3cdf90a
   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/* This value must be multiple of (pagesize * 2) */
 100#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 101
 102#else /* NO_MMAP */
 103
 104#include <sys/mman.h>
 105
 106/* This value must be multiple of (pagesize * 2) */
 107#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 108        (sizeof(void*) >= 8 \
 109                ?  1 * 1024 * 1024 * 1024 \
 110                : 32 * 1024 * 1024)
 111
 112#endif /* NO_MMAP */
 113
 114#define DEFAULT_PACKED_GIT_LIMIT \
 115        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 116
 117#ifdef NO_PREAD
 118#define pread git_pread
 119extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 120#endif
 121
 122#ifdef NO_SETENV
 123#define setenv gitsetenv
 124extern int gitsetenv(const char *, const char *, int);
 125#endif
 126
 127#ifdef NO_UNSETENV
 128#define unsetenv gitunsetenv
 129extern void gitunsetenv(const char *);
 130#endif
 131
 132#ifdef NO_STRCASESTR
 133#define strcasestr gitstrcasestr
 134extern char *gitstrcasestr(const char *haystack, const char *needle);
 135#endif
 136
 137#ifdef NO_STRLCPY
 138#define strlcpy gitstrlcpy
 139extern size_t gitstrlcpy(char *, const char *, size_t);
 140#endif
 141
 142extern void release_pack_memory(size_t);
 143
 144static inline char* xstrdup(const char *str)
 145{
 146        char *ret = strdup(str);
 147        if (!ret) {
 148                release_pack_memory(strlen(str) + 1);
 149                ret = strdup(str);
 150                if (!ret)
 151                        die("Out of memory, strdup failed");
 152        }
 153        return ret;
 154}
 155
 156static inline void *xmalloc(size_t size)
 157{
 158        void *ret = malloc(size);
 159        if (!ret && !size)
 160                ret = malloc(1);
 161        if (!ret) {
 162                release_pack_memory(size);
 163                ret = malloc(size);
 164                if (!ret && !size)
 165                        ret = malloc(1);
 166                if (!ret)
 167                        die("Out of memory, malloc failed");
 168        }
 169#ifdef XMALLOC_POISON
 170        memset(ret, 0xA5, size);
 171#endif
 172        return ret;
 173}
 174
 175static inline void *xrealloc(void *ptr, size_t size)
 176{
 177        void *ret = realloc(ptr, size);
 178        if (!ret && !size)
 179                ret = realloc(ptr, 1);
 180        if (!ret) {
 181                release_pack_memory(size);
 182                ret = realloc(ptr, size);
 183                if (!ret && !size)
 184                        ret = realloc(ptr, 1);
 185                if (!ret)
 186                        die("Out of memory, realloc failed");
 187        }
 188        return ret;
 189}
 190
 191static inline void *xcalloc(size_t nmemb, size_t size)
 192{
 193        void *ret = calloc(nmemb, size);
 194        if (!ret && (!nmemb || !size))
 195                ret = calloc(1, 1);
 196        if (!ret) {
 197                release_pack_memory(nmemb * size);
 198                ret = calloc(nmemb, size);
 199                if (!ret && (!nmemb || !size))
 200                        ret = calloc(1, 1);
 201                if (!ret)
 202                        die("Out of memory, calloc failed");
 203        }
 204        return ret;
 205}
 206
 207static inline void *xmmap(void *start, size_t length,
 208        int prot, int flags, int fd, off_t offset)
 209{
 210        void *ret = mmap(start, length, prot, flags, fd, offset);
 211        if (ret == MAP_FAILED) {
 212                if (!length)
 213                        return NULL;
 214                release_pack_memory(length);
 215                ret = mmap(start, length, prot, flags, fd, offset);
 216                if (ret == MAP_FAILED)
 217                        die("Out of memory? mmap failed: %s", strerror(errno));
 218        }
 219        return ret;
 220}
 221
 222static inline ssize_t xread(int fd, void *buf, size_t len)
 223{
 224        ssize_t nr;
 225        while (1) {
 226                nr = read(fd, buf, len);
 227                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 228                        continue;
 229                return nr;
 230        }
 231}
 232
 233static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 234{
 235        ssize_t nr;
 236        while (1) {
 237                nr = write(fd, buf, len);
 238                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 239                        continue;
 240                return nr;
 241        }
 242}
 243
 244static inline int has_extension(const char *filename, const char *ext)
 245{
 246        size_t len = strlen(filename);
 247        size_t extlen = strlen(ext);
 248        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 249}
 250
 251/* Sane ctype - no locale, and works with signed chars */
 252#undef isspace
 253#undef isdigit
 254#undef isalpha
 255#undef isalnum
 256#undef tolower
 257#undef toupper
 258extern unsigned char sane_ctype[256];
 259#define GIT_SPACE 0x01
 260#define GIT_DIGIT 0x02
 261#define GIT_ALPHA 0x04
 262#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 263#define isspace(x) sane_istest(x,GIT_SPACE)
 264#define isdigit(x) sane_istest(x,GIT_DIGIT)
 265#define isalpha(x) sane_istest(x,GIT_ALPHA)
 266#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 267#define tolower(x) sane_case((unsigned char)(x), 0x20)
 268#define toupper(x) sane_case((unsigned char)(x), 0)
 269
 270static inline int sane_case(int x, int high)
 271{
 272        if (sane_istest(x, GIT_ALPHA))
 273                x = (x & ~0x20) | high;
 274        return x;
 275}
 276
 277#endif