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, int);
 160
 161static inline char* xstrdup(const char *str)
 162{
 163        char *ret = strdup(str);
 164        if (!ret) {
 165                release_pack_memory(strlen(str) + 1, -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, -1);
 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 char *xstrndup(const char *str, size_t len)
 193{
 194        char *p;
 195
 196        p = memchr(str, '\0', len);
 197        if (p)
 198                len = p - str;
 199        p = xmalloc(len + 1);
 200        memcpy(p, str, len);
 201        p[len] = '\0';
 202        return p;
 203}
 204
 205static inline void *xrealloc(void *ptr, size_t size)
 206{
 207        void *ret = realloc(ptr, size);
 208        if (!ret && !size)
 209                ret = realloc(ptr, 1);
 210        if (!ret) {
 211                release_pack_memory(size, -1);
 212                ret = realloc(ptr, size);
 213                if (!ret && !size)
 214                        ret = realloc(ptr, 1);
 215                if (!ret)
 216                        die("Out of memory, realloc failed");
 217        }
 218        return ret;
 219}
 220
 221static inline void *xcalloc(size_t nmemb, size_t size)
 222{
 223        void *ret = calloc(nmemb, size);
 224        if (!ret && (!nmemb || !size))
 225                ret = calloc(1, 1);
 226        if (!ret) {
 227                release_pack_memory(nmemb * size, -1);
 228                ret = calloc(nmemb, size);
 229                if (!ret && (!nmemb || !size))
 230                        ret = calloc(1, 1);
 231                if (!ret)
 232                        die("Out of memory, calloc failed");
 233        }
 234        return ret;
 235}
 236
 237static inline void *xmmap(void *start, size_t length,
 238        int prot, int flags, int fd, off_t offset)
 239{
 240        void *ret = mmap(start, length, prot, flags, fd, offset);
 241        if (ret == MAP_FAILED) {
 242                if (!length)
 243                        return NULL;
 244                release_pack_memory(length, fd);
 245                ret = mmap(start, length, prot, flags, fd, offset);
 246                if (ret == MAP_FAILED)
 247                        die("Out of memory? mmap failed: %s", strerror(errno));
 248        }
 249        return ret;
 250}
 251
 252static inline ssize_t xread(int fd, void *buf, size_t len)
 253{
 254        ssize_t nr;
 255        while (1) {
 256                nr = read(fd, buf, len);
 257                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 258                        continue;
 259                return nr;
 260        }
 261}
 262
 263static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 264{
 265        ssize_t nr;
 266        while (1) {
 267                nr = write(fd, buf, len);
 268                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 269                        continue;
 270                return nr;
 271        }
 272}
 273
 274static inline size_t xsize_t(off_t len)
 275{
 276        return (size_t)len;
 277}
 278
 279static inline int has_extension(const char *filename, const char *ext)
 280{
 281        size_t len = strlen(filename);
 282        size_t extlen = strlen(ext);
 283        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 284}
 285
 286/* Sane ctype - no locale, and works with signed chars */
 287#undef isspace
 288#undef isdigit
 289#undef isalpha
 290#undef isalnum
 291#undef tolower
 292#undef toupper
 293extern unsigned char sane_ctype[256];
 294#define GIT_SPACE 0x01
 295#define GIT_DIGIT 0x02
 296#define GIT_ALPHA 0x04
 297#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 298#define isspace(x) sane_istest(x,GIT_SPACE)
 299#define isdigit(x) sane_istest(x,GIT_DIGIT)
 300#define isalpha(x) sane_istest(x,GIT_ALPHA)
 301#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 302#define tolower(x) sane_case((unsigned char)(x), 0x20)
 303#define toupper(x) sane_case((unsigned char)(x), 0)
 304
 305static inline int sane_case(int x, int high)
 306{
 307        if (sane_istest(x, GIT_ALPHA))
 308                x = (x & ~0x20) | high;
 309        return x;
 310}
 311
 312static inline int prefixcmp(const char *str, const char *prefix)
 313{
 314        return strncmp(str, prefix, strlen(prefix));
 315}
 316
 317static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 318{
 319        unsigned long ul;
 320        char *p;
 321
 322        errno = 0;
 323        ul = strtoul(s, &p, base);
 324        if (errno || *p || p == s || (unsigned int) ul != ul)
 325                return -1;
 326        *result = ul;
 327        return 0;
 328}
 329
 330#endif