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/* Approximation of the length of the decimal representation of this type. */
  17#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  18
  19#if !defined(__APPLE__) && !defined(__FreeBSD__)
  20#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  21#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  22#endif
  23#define _ALL_SOURCE 1
  24#define _GNU_SOURCE 1
  25#define _BSD_SOURCE 1
  26
  27#include <unistd.h>
  28#include <stdio.h>
  29#include <sys/stat.h>
  30#include <fcntl.h>
  31#include <stddef.h>
  32#include <stdlib.h>
  33#include <stdarg.h>
  34#include <string.h>
  35#include <errno.h>
  36#include <limits.h>
  37#include <sys/param.h>
  38#include <sys/types.h>
  39#include <dirent.h>
  40#include <sys/time.h>
  41#include <time.h>
  42#include <signal.h>
  43#include <sys/wait.h>
  44#include <fnmatch.h>
  45#include <sys/poll.h>
  46#include <sys/socket.h>
  47#include <assert.h>
  48#include <regex.h>
  49#include <netinet/in.h>
  50#include <netinet/tcp.h>
  51#include <arpa/inet.h>
  52#include <netdb.h>
  53#include <pwd.h>
  54#include <inttypes.h>
  55#if defined(__CYGWIN__)
  56#undef _XOPEN_SOURCE
  57#include <grp.h>
  58#define _XOPEN_SOURCE 600
  59#else
  60#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  61#include <grp.h>
  62#define _ALL_SOURCE 1
  63#endif
  64
  65#ifndef NO_ICONV
  66#include <iconv.h>
  67#endif
  68
  69/* On most systems <limits.h> would have given us this, but
  70 * not on some systems (e.g. GNU/Hurd).
  71 */
  72#ifndef PATH_MAX
  73#define PATH_MAX 4096
  74#endif
  75
  76#ifndef PRIuMAX
  77#define PRIuMAX "llu"
  78#endif
  79
  80#ifdef __GNUC__
  81#define NORETURN __attribute__((__noreturn__))
  82#else
  83#define NORETURN
  84#ifndef __attribute__
  85#define __attribute__(x)
  86#endif
  87#endif
  88
  89/* General helper functions */
  90extern void usage(const char *err) NORETURN;
  91extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  92extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  93extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
  94
  95extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  96extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  97extern void set_error_routine(void (*routine)(const char *err, va_list params));
  98extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  99
 100#ifdef NO_MMAP
 101
 102#ifndef PROT_READ
 103#define PROT_READ 1
 104#define PROT_WRITE 2
 105#define MAP_PRIVATE 1
 106#define MAP_FAILED ((void*)-1)
 107#endif
 108
 109#define mmap git_mmap
 110#define munmap git_munmap
 111extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 112extern int git_munmap(void *start, size_t length);
 113
 114/* This value must be multiple of (pagesize * 2) */
 115#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 116
 117#else /* NO_MMAP */
 118
 119#include <sys/mman.h>
 120
 121/* This value must be multiple of (pagesize * 2) */
 122#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 123        (sizeof(void*) >= 8 \
 124                ?  1 * 1024 * 1024 * 1024 \
 125                : 32 * 1024 * 1024)
 126
 127#endif /* NO_MMAP */
 128
 129#define DEFAULT_PACKED_GIT_LIMIT \
 130        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 131
 132#ifdef NO_PREAD
 133#define pread git_pread
 134extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 135#endif
 136
 137#ifdef NO_SETENV
 138#define setenv gitsetenv
 139extern int gitsetenv(const char *, const char *, int);
 140#endif
 141
 142#ifdef NO_UNSETENV
 143#define unsetenv gitunsetenv
 144extern void gitunsetenv(const char *);
 145#endif
 146
 147#ifdef NO_STRCASESTR
 148#define strcasestr gitstrcasestr
 149extern char *gitstrcasestr(const char *haystack, const char *needle);
 150#endif
 151
 152#ifdef NO_STRLCPY
 153#define strlcpy gitstrlcpy
 154extern size_t gitstrlcpy(char *, const char *, size_t);
 155#endif
 156
 157#ifdef NO_STRTOUMAX
 158#define strtoumax gitstrtoumax
 159extern uintmax_t gitstrtoumax(const char *, char **, int);
 160#endif
 161
 162extern void release_pack_memory(size_t, int);
 163
 164static inline char* xstrdup(const char *str)
 165{
 166        char *ret = strdup(str);
 167        if (!ret) {
 168                release_pack_memory(strlen(str) + 1, -1);
 169                ret = strdup(str);
 170                if (!ret)
 171                        die("Out of memory, strdup failed");
 172        }
 173        return ret;
 174}
 175
 176static inline void *xmalloc(size_t size)
 177{
 178        void *ret = malloc(size);
 179        if (!ret && !size)
 180                ret = malloc(1);
 181        if (!ret) {
 182                release_pack_memory(size, -1);
 183                ret = malloc(size);
 184                if (!ret && !size)
 185                        ret = malloc(1);
 186                if (!ret)
 187                        die("Out of memory, malloc failed");
 188        }
 189#ifdef XMALLOC_POISON
 190        memset(ret, 0xA5, size);
 191#endif
 192        return ret;
 193}
 194
 195static inline char *xstrndup(const char *str, size_t len)
 196{
 197        char *p;
 198
 199        p = memchr(str, '\0', len);
 200        if (p)
 201                len = p - str;
 202        p = xmalloc(len + 1);
 203        memcpy(p, str, len);
 204        p[len] = '\0';
 205        return p;
 206}
 207
 208static inline void *xrealloc(void *ptr, size_t size)
 209{
 210        void *ret = realloc(ptr, size);
 211        if (!ret && !size)
 212                ret = realloc(ptr, 1);
 213        if (!ret) {
 214                release_pack_memory(size, -1);
 215                ret = realloc(ptr, size);
 216                if (!ret && !size)
 217                        ret = realloc(ptr, 1);
 218                if (!ret)
 219                        die("Out of memory, realloc failed");
 220        }
 221        return ret;
 222}
 223
 224static inline void *xcalloc(size_t nmemb, size_t size)
 225{
 226        void *ret = calloc(nmemb, size);
 227        if (!ret && (!nmemb || !size))
 228                ret = calloc(1, 1);
 229        if (!ret) {
 230                release_pack_memory(nmemb * size, -1);
 231                ret = calloc(nmemb, size);
 232                if (!ret && (!nmemb || !size))
 233                        ret = calloc(1, 1);
 234                if (!ret)
 235                        die("Out of memory, calloc failed");
 236        }
 237        return ret;
 238}
 239
 240static inline void *xmmap(void *start, size_t length,
 241        int prot, int flags, int fd, off_t offset)
 242{
 243        void *ret = mmap(start, length, prot, flags, fd, offset);
 244        if (ret == MAP_FAILED) {
 245                if (!length)
 246                        return NULL;
 247                release_pack_memory(length, fd);
 248                ret = mmap(start, length, prot, flags, fd, offset);
 249                if (ret == MAP_FAILED)
 250                        die("Out of memory? mmap failed: %s", strerror(errno));
 251        }
 252        return ret;
 253}
 254
 255static inline ssize_t xread(int fd, void *buf, size_t len)
 256{
 257        ssize_t nr;
 258        while (1) {
 259                nr = read(fd, buf, len);
 260                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 261                        continue;
 262                return nr;
 263        }
 264}
 265
 266static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 267{
 268        ssize_t nr;
 269        while (1) {
 270                nr = write(fd, buf, len);
 271                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 272                        continue;
 273                return nr;
 274        }
 275}
 276
 277static inline size_t xsize_t(off_t len)
 278{
 279        return (size_t)len;
 280}
 281
 282static inline int has_extension(const char *filename, const char *ext)
 283{
 284        size_t len = strlen(filename);
 285        size_t extlen = strlen(ext);
 286        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 287}
 288
 289/* Sane ctype - no locale, and works with signed chars */
 290#undef isspace
 291#undef isdigit
 292#undef isalpha
 293#undef isalnum
 294#undef tolower
 295#undef toupper
 296extern unsigned char sane_ctype[256];
 297#define GIT_SPACE 0x01
 298#define GIT_DIGIT 0x02
 299#define GIT_ALPHA 0x04
 300#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 301#define isspace(x) sane_istest(x,GIT_SPACE)
 302#define isdigit(x) sane_istest(x,GIT_DIGIT)
 303#define isalpha(x) sane_istest(x,GIT_ALPHA)
 304#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 305#define tolower(x) sane_case((unsigned char)(x), 0x20)
 306#define toupper(x) sane_case((unsigned char)(x), 0)
 307
 308static inline int sane_case(int x, int high)
 309{
 310        if (sane_istest(x, GIT_ALPHA))
 311                x = (x & ~0x20) | high;
 312        return x;
 313}
 314
 315static inline int prefixcmp(const char *str, const char *prefix)
 316{
 317        return strncmp(str, prefix, strlen(prefix));
 318}
 319
 320static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 321{
 322        unsigned long ul;
 323        char *p;
 324
 325        errno = 0;
 326        ul = strtoul(s, &p, base);
 327        if (errno || *p || p == s || (unsigned int) ul != ul)
 328                return -1;
 329        *result = ul;
 330        return 0;
 331}
 332
 333#endif