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