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