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 _GNU_SOURCE
  19#define _BSD_SOURCE
  20
  21#include <unistd.h>
  22#include <stdio.h>
  23#include <sys/stat.h>
  24#include <fcntl.h>
  25#include <stddef.h>
  26#include <stdlib.h>
  27#include <stdarg.h>
  28#include <string.h>
  29#include <errno.h>
  30#include <limits.h>
  31#include <inttypes.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 <grp.h>
  50
  51#ifndef NO_ICONV
  52#include <iconv.h>
  53#endif
  54
  55/* On most systems <limits.h> would have given us this, but
  56 * not on some systems (e.g. GNU/Hurd).
  57 */
  58#ifndef PATH_MAX
  59#define PATH_MAX 4096
  60#endif
  61
  62#ifdef __GNUC__
  63#define NORETURN __attribute__((__noreturn__))
  64#else
  65#define NORETURN
  66#ifndef __attribute__
  67#define __attribute__(x)
  68#endif
  69#endif
  70
  71/* General helper functions */
  72extern void usage(const char *err) NORETURN;
  73extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  74extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  75extern void warn(const char *err, ...) __attribute__((format (printf, 1, 2)));
  76
  77extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  78extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  79extern void set_error_routine(void (*routine)(const char *err, va_list params));
  80extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  81
  82#ifdef NO_MMAP
  83
  84#ifndef PROT_READ
  85#define PROT_READ 1
  86#define PROT_WRITE 2
  87#define MAP_PRIVATE 1
  88#define MAP_FAILED ((void*)-1)
  89#endif
  90
  91#define mmap git_mmap
  92#define munmap git_munmap
  93extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
  94extern int git_munmap(void *start, size_t length);
  95
  96#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
  97
  98#else /* NO_MMAP */
  99
 100#include <sys/mman.h>
 101#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 102        (sizeof(void*) >= 8 \
 103                ?  1 * 1024 * 1024 * 1024 \
 104                : 32 * 1024 * 1024)
 105
 106#endif /* NO_MMAP */
 107
 108#define DEFAULT_PACKED_GIT_LIMIT \
 109        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 110
 111#ifdef NO_PREAD
 112#define pread git_pread
 113extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 114#endif
 115
 116#ifdef NO_SETENV
 117#define setenv gitsetenv
 118extern int gitsetenv(const char *, const char *, int);
 119#endif
 120
 121#ifdef NO_UNSETENV
 122#define unsetenv gitunsetenv
 123extern void gitunsetenv(const char *);
 124#endif
 125
 126#ifdef NO_STRCASESTR
 127#define strcasestr gitstrcasestr
 128extern char *gitstrcasestr(const char *haystack, const char *needle);
 129#endif
 130
 131#ifdef NO_STRLCPY
 132#define strlcpy gitstrlcpy
 133extern size_t gitstrlcpy(char *, const char *, size_t);
 134#endif
 135
 136extern void release_pack_memory(size_t);
 137
 138static inline char* xstrdup(const char *str)
 139{
 140        char *ret = strdup(str);
 141        if (!ret) {
 142                release_pack_memory(strlen(str) + 1);
 143                ret = strdup(str);
 144                if (!ret)
 145                        die("Out of memory, strdup failed");
 146        }
 147        return ret;
 148}
 149
 150static inline void *xmalloc(size_t size)
 151{
 152        void *ret = malloc(size);
 153        if (!ret && !size)
 154                ret = malloc(1);
 155        if (!ret) {
 156                release_pack_memory(size);
 157                ret = malloc(size);
 158                if (!ret && !size)
 159                        ret = malloc(1);
 160                if (!ret)
 161                        die("Out of memory, malloc failed");
 162        }
 163#ifdef XMALLOC_POISON
 164        memset(ret, 0xA5, size);
 165#endif
 166        return ret;
 167}
 168
 169static inline void *xrealloc(void *ptr, size_t size)
 170{
 171        void *ret = realloc(ptr, size);
 172        if (!ret && !size)
 173                ret = realloc(ptr, 1);
 174        if (!ret) {
 175                release_pack_memory(size);
 176                ret = realloc(ptr, size);
 177                if (!ret && !size)
 178                        ret = realloc(ptr, 1);
 179                if (!ret)
 180                        die("Out of memory, realloc failed");
 181        }
 182        return ret;
 183}
 184
 185static inline void *xcalloc(size_t nmemb, size_t size)
 186{
 187        void *ret = calloc(nmemb, size);
 188        if (!ret && (!nmemb || !size))
 189                ret = calloc(1, 1);
 190        if (!ret) {
 191                release_pack_memory(nmemb * size);
 192                ret = calloc(nmemb, size);
 193                if (!ret && (!nmemb || !size))
 194                        ret = calloc(1, 1);
 195                if (!ret)
 196                        die("Out of memory, calloc failed");
 197        }
 198        return ret;
 199}
 200
 201static inline void *xmmap(void *start, size_t length,
 202        int prot, int flags, int fd, off_t offset)
 203{
 204        void *ret = mmap(start, length, prot, flags, fd, offset);
 205        if (ret == MAP_FAILED) {
 206                if (!length)
 207                        return NULL;
 208                release_pack_memory(length);
 209                ret = mmap(start, length, prot, flags, fd, offset);
 210                if (ret == MAP_FAILED)
 211                        die("Out of memory? mmap failed: %s", strerror(errno));
 212        }
 213        return ret;
 214}
 215
 216static inline ssize_t xread(int fd, void *buf, size_t len)
 217{
 218        ssize_t nr;
 219        while (1) {
 220                nr = read(fd, buf, len);
 221                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 222                        continue;
 223                return nr;
 224        }
 225}
 226
 227static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 228{
 229        ssize_t nr;
 230        while (1) {
 231                nr = write(fd, buf, len);
 232                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 233                        continue;
 234                return nr;
 235        }
 236}
 237
 238static inline int has_extension(const char *filename, const char *ext)
 239{
 240        size_t len = strlen(filename);
 241        size_t extlen = strlen(ext);
 242        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 243}
 244
 245/* Sane ctype - no locale, and works with signed chars */
 246#undef isspace
 247#undef isdigit
 248#undef isalpha
 249#undef isalnum
 250#undef tolower
 251#undef toupper
 252extern unsigned char sane_ctype[256];
 253#define GIT_SPACE 0x01
 254#define GIT_DIGIT 0x02
 255#define GIT_ALPHA 0x04
 256#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 257#define isspace(x) sane_istest(x,GIT_SPACE)
 258#define isdigit(x) sane_istest(x,GIT_DIGIT)
 259#define isalpha(x) sane_istest(x,GIT_ALPHA)
 260#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 261#define tolower(x) sane_case((unsigned char)(x), 0x20)
 262#define toupper(x) sane_case((unsigned char)(x), 0)
 263
 264static inline int sane_case(int x, int high)
 265{
 266        if (sane_istest(x, GIT_ALPHA))
 267                x = (x & ~0x20) | high;
 268        return x;
 269}
 270
 271#endif