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