Andrew's git - gitweb.git/blob

   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6#ifndef FLEX_ARRAY
   7#if defined(__GNUC__) && (__GNUC__ < 3)
   8#define FLEX_ARRAY 0
   9#else
  10#define FLEX_ARRAY /* empty */
  11#endif
  12#endif
  13
  14#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  15
  16#if !defined(__APPLE__) && !defined(__FreeBSD__)
  17#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  18#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  19#endif
  20#define _ALL_SOURCE 1
  21#define _GNU_SOURCE 1
  22#define _BSD_SOURCE 1
  23
  24#include <unistd.h>
  25#include <stdio.h>
  26#include <sys/stat.h>
  27#include <fcntl.h>
  28#include <stddef.h>
  29#include <stdlib.h>
  30#include <stdarg.h>
  31#include <string.h>
  32#include <errno.h>
  33#include <limits.h>
  34#include <sys/param.h>
  35#include <sys/types.h>
  36#include <dirent.h>
  37#include <sys/time.h>
  38#include <time.h>
  39#include <signal.h>
  40#include <sys/wait.h>
  41#include <fnmatch.h>
  42#include <sys/poll.h>
  43#include <sys/socket.h>
  44#include <assert.h>
  45#include <regex.h>
  46#include <netinet/in.h>
  47#include <netinet/tcp.h>
  48#include <arpa/inet.h>
  49#include <netdb.h>
  50#include <pwd.h>
  51#include <inttypes.h>
  52#if defined(__CYGWIN__)
  53#undef _XOPEN_SOURCE
  54#include <grp.h>
  55#define _XOPEN_SOURCE 600
  56#else
  57#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  58#include <grp.h>
  59#define _ALL_SOURCE 1
  60#endif
  61
  62#ifndef NO_ICONV
  63#include <iconv.h>
  64#endif
  65
  66/* On most systems <limits.h> would have given us this, but
  67 * not on some systems (e.g. GNU/Hurd).
  68 */
  69#ifndef PATH_MAX
  70#define PATH_MAX 4096
  71#endif
  72
  73#ifndef PRIuMAX
  74#define PRIuMAX "llu"
  75#endif
  76
  77#ifdef __GNUC__
  78#define NORETURN __attribute__((__noreturn__))
  79#else
  80#define NORETURN
  81#ifndef __attribute__
  82#define __attribute__(x)
  83#endif
  84#endif
  85
  86/* General helper functions */
  87extern void usage(const char *err) NORETURN;
  88extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  89extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  90extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
  91
  92extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  93extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  94extern void set_error_routine(void (*routine)(const char *err, va_list params));
  95extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  96
  97#ifdef NO_MMAP
  98
  99#ifndef PROT_READ
 100#define PROT_READ 1
 101#define PROT_WRITE 2
 102#define MAP_PRIVATE 1
 103#define MAP_FAILED ((void*)-1)
 104#endif
 105
 106#define mmap git_mmap
 107#define munmap git_munmap
 108extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 109extern int git_munmap(void *start, size_t length);
 110
 111/* This value must be multiple of (pagesize * 2) */
 112#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 113
 114#else /* NO_MMAP */
 115
 116#include <sys/mman.h>
 117
 118/* This value must be multiple of (pagesize * 2) */
 119#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 120        (sizeof(void*) >= 8 \
 121                ?  1 * 1024 * 1024 * 1024 \
 122                : 32 * 1024 * 1024)
 123
 124#endif /* NO_MMAP */
 125
 126#define DEFAULT_PACKED_GIT_LIMIT \
 127        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 128
 129#ifdef NO_PREAD
 130#define pread git_pread
 131extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 132#endif
 133
 134#ifdef NO_SETENV
 135#define setenv gitsetenv
 136extern int gitsetenv(const char *, const char *, int);
 137#endif
 138
 139#ifdef NO_UNSETENV
 140#define unsetenv gitunsetenv
 141extern void gitunsetenv(const char *);
 142#endif
 143
 144#ifdef NO_STRCASESTR
 145#define strcasestr gitstrcasestr
 146extern char *gitstrcasestr(const char *haystack, const char *needle);
 147#endif
 148
 149#ifdef NO_STRLCPY
 150#define strlcpy gitstrlcpy
 151extern size_t gitstrlcpy(char *, const char *, size_t);
 152#endif
 153
 154#ifdef NO_STRTOUMAX
 155#define strtoumax gitstrtoumax
 156extern uintmax_t gitstrtoumax(const char *, char **, int);
 157#endif
 158
 159extern void release_pack_memory(size_t);
 160
 161static inline char* xstrdup(const char *str)
 162{
 163        char *ret = strdup(str);
 164        if (!ret) {
 165                release_pack_memory(strlen(str) + 1);
 166                ret = strdup(str);
 167                if (!ret)
 168                        die("Out of memory, strdup failed");
 169        }
 170        return ret;
 171}
 172
 173static inline void *xmalloc(size_t size)
 174{
 175        void *ret = malloc(size);
 176        if (!ret && !size)
 177                ret = malloc(1);
 178        if (!ret) {
 179                release_pack_memory(size);
 180                ret = malloc(size);
 181                if (!ret && !size)
 182                        ret = malloc(1);
 183                if (!ret)
 184                        die("Out of memory, malloc failed");
 185        }
 186#ifdef XMALLOC_POISON
 187        memset(ret, 0xA5, size);
 188#endif
 189        return ret;
 190}
 191
 192static inline void *xrealloc(void *ptr, size_t size)
 193{
 194        void *ret = realloc(ptr, size);
 195        if (!ret && !size)
 196                ret = realloc(ptr, 1);
 197        if (!ret) {
 198                release_pack_memory(size);
 199                ret = realloc(ptr, size);
 200                if (!ret && !size)
 201                        ret = realloc(ptr, 1);
 202                if (!ret)
 203                        die("Out of memory, realloc failed");
 204        }
 205        return ret;
 206}
 207
 208static inline void *xcalloc(size_t nmemb, size_t size)
 209{
 210        void *ret = calloc(nmemb, size);
 211        if (!ret && (!nmemb || !size))
 212                ret = calloc(1, 1);
 213        if (!ret) {
 214                release_pack_memory(nmemb * size);
 215                ret = calloc(nmemb, size);
 216                if (!ret && (!nmemb || !size))
 217                        ret = calloc(1, 1);
 218                if (!ret)
 219                        die("Out of memory, calloc failed");
 220        }
 221        return ret;
 222}
 223
 224static inline void *xmmap(void *start, size_t length,
 225        int prot, int flags, int fd, off_t offset)
 226{
 227        void *ret = mmap(start, length, prot, flags, fd, offset);
 228        if (ret == MAP_FAILED) {
 229                if (!length)
 230                        return NULL;
 231                release_pack_memory(length);
 232                ret = mmap(start, length, prot, flags, fd, offset);
 233                if (ret == MAP_FAILED)
 234                        die("Out of memory? mmap failed: %s", strerror(errno));
 235        }
 236        return ret;
 237}
 238
 239static inline ssize_t xread(int fd, void *buf, size_t len)
 240{
 241        ssize_t nr;
 242        while (1) {
 243                nr = read(fd, buf, len);
 244                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 245                        continue;
 246                return nr;
 247        }
 248}
 249
 250static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 251{
 252        ssize_t nr;
 253        while (1) {
 254                nr = write(fd, buf, len);
 255                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 256                        continue;
 257                return nr;
 258        }
 259}
 260
 261static inline size_t xsize_t(off_t len)
 262{
 263        return (size_t)len;
 264}
 265
 266static inline int has_extension(const char *filename, const char *ext)
 267{
 268        size_t len = strlen(filename);
 269        size_t extlen = strlen(ext);
 270        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 271}
 272
 273/* Sane ctype - no locale, and works with signed chars */
 274#undef isspace
 275#undef isdigit
 276#undef isalpha
 277#undef isalnum
 278#undef tolower
 279#undef toupper
 280extern unsigned char sane_ctype[256];
 281#define GIT_SPACE 0x01
 282#define GIT_DIGIT 0x02
 283#define GIT_ALPHA 0x04
 284#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 285#define isspace(x) sane_istest(x,GIT_SPACE)
 286#define isdigit(x) sane_istest(x,GIT_DIGIT)
 287#define isalpha(x) sane_istest(x,GIT_ALPHA)
 288#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 289#define tolower(x) sane_case((unsigned char)(x), 0x20)
 290#define toupper(x) sane_case((unsigned char)(x), 0)
 291
 292static inline int sane_case(int x, int high)
 293{
 294        if (sane_istest(x, GIT_ALPHA))
 295                x = (x & ~0x20) | high;
 296        return x;
 297}
 298
 299static inline int prefixcmp(const char *str, const char *prefix)
 300{
 301        return strncmp(str, prefix, strlen(prefix));
 302}
 303
 304#endif