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/* 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
 142#ifdef NO_STRTOUMAX
 143#define strtoumax gitstrtoumax
 144extern uintmax_t gitstrtoumax(const char *, char **, int);
 145#endif
 146
 147extern void release_pack_memory(size_t);
 148
 149static inline char* xstrdup(const char *str)
 150{
 151        char *ret = strdup(str);
 152        if (!ret) {
 153                release_pack_memory(strlen(str) + 1);
 154                ret = strdup(str);
 155                if (!ret)
 156                        die("Out of memory, strdup failed");
 157        }
 158        return ret;
 159}
 160
 161static inline void *xmalloc(size_t size)
 162{
 163        void *ret = malloc(size);
 164        if (!ret && !size)
 165                ret = malloc(1);
 166        if (!ret) {
 167                release_pack_memory(size);
 168                ret = malloc(size);
 169                if (!ret && !size)
 170                        ret = malloc(1);
 171                if (!ret)
 172                        die("Out of memory, malloc failed");
 173        }
 174#ifdef XMALLOC_POISON
 175        memset(ret, 0xA5, size);
 176#endif
 177        return ret;
 178}
 179
 180static inline void *xrealloc(void *ptr, size_t size)
 181{
 182        void *ret = realloc(ptr, size);
 183        if (!ret && !size)
 184                ret = realloc(ptr, 1);
 185        if (!ret) {
 186                release_pack_memory(size);
 187                ret = realloc(ptr, size);
 188                if (!ret && !size)
 189                        ret = realloc(ptr, 1);
 190                if (!ret)
 191                        die("Out of memory, realloc failed");
 192        }
 193        return ret;
 194}
 195
 196static inline void *xcalloc(size_t nmemb, size_t size)
 197{
 198        void *ret = calloc(nmemb, size);
 199        if (!ret && (!nmemb || !size))
 200                ret = calloc(1, 1);
 201        if (!ret) {
 202                release_pack_memory(nmemb * size);
 203                ret = calloc(nmemb, size);
 204                if (!ret && (!nmemb || !size))
 205                        ret = calloc(1, 1);
 206                if (!ret)
 207                        die("Out of memory, calloc failed");
 208        }
 209        return ret;
 210}
 211
 212static inline void *xmmap(void *start, size_t length,
 213        int prot, int flags, int fd, off_t offset)
 214{
 215        void *ret = mmap(start, length, prot, flags, fd, offset);
 216        if (ret == MAP_FAILED) {
 217                if (!length)
 218                        return NULL;
 219                release_pack_memory(length);
 220                ret = mmap(start, length, prot, flags, fd, offset);
 221                if (ret == MAP_FAILED)
 222                        die("Out of memory? mmap failed: %s", strerror(errno));
 223        }
 224        return ret;
 225}
 226
 227static inline ssize_t xread(int fd, void *buf, size_t len)
 228{
 229        ssize_t nr;
 230        while (1) {
 231                nr = read(fd, buf, len);
 232                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 233                        continue;
 234                return nr;
 235        }
 236}
 237
 238static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 239{
 240        ssize_t nr;
 241        while (1) {
 242                nr = write(fd, buf, len);
 243                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 244                        continue;
 245                return nr;
 246        }
 247}
 248
 249static inline int has_extension(const char *filename, const char *ext)
 250{
 251        size_t len = strlen(filename);
 252        size_t extlen = strlen(ext);
 253        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 254}
 255
 256/* Sane ctype - no locale, and works with signed chars */
 257#undef isspace
 258#undef isdigit
 259#undef isalpha
 260#undef isalnum
 261#undef tolower
 262#undef toupper
 263extern unsigned char sane_ctype[256];
 264#define GIT_SPACE 0x01
 265#define GIT_DIGIT 0x02
 266#define GIT_ALPHA 0x04
 267#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 268#define isspace(x) sane_istest(x,GIT_SPACE)
 269#define isdigit(x) sane_istest(x,GIT_DIGIT)
 270#define isalpha(x) sane_istest(x,GIT_ALPHA)
 271#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 272#define tolower(x) sane_case((unsigned char)(x), 0x20)
 273#define toupper(x) sane_case((unsigned char)(x), 0)
 274
 275static inline int sane_case(int x, int high)
 276{
 277        if (sane_istest(x, GIT_ALPHA))
 278                x = (x & ~0x20) | high;
 279        return x;
 280}
 281
 282#endif