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#ifdef __GNUC__
  17#define TYPEOF(x) (__typeof__(x))
  18#else
  19#define TYPEOF(x)
  20#endif
  21
  22#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
  23
  24#if !defined(__APPLE__) && !defined(__FreeBSD__)
  25#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  26#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  27#endif
  28#define _ALL_SOURCE 1
  29#define _GNU_SOURCE 1
  30#define _BSD_SOURCE 1
  31
  32#include <unistd.h>
  33#include <stdio.h>
  34#include <sys/stat.h>
  35#include <fcntl.h>
  36#include <stddef.h>
  37#include <stdlib.h>
  38#include <stdarg.h>
  39#include <string.h>
  40#include <errno.h>
  41#include <limits.h>
  42#include <sys/param.h>
  43#include <sys/types.h>
  44#include <dirent.h>
  45#include <sys/time.h>
  46#include <time.h>
  47#include <signal.h>
  48#include <sys/wait.h>
  49#include <fnmatch.h>
  50#include <sys/poll.h>
  51#include <sys/socket.h>
  52#include <assert.h>
  53#include <regex.h>
  54#include <netinet/in.h>
  55#include <netinet/tcp.h>
  56#include <arpa/inet.h>
  57#include <netdb.h>
  58#include <pwd.h>
  59#include <inttypes.h>
  60#if defined(__CYGWIN__)
  61#undef _XOPEN_SOURCE
  62#include <grp.h>
  63#define _XOPEN_SOURCE 600
  64#else
  65#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  66#include <grp.h>
  67#define _ALL_SOURCE 1
  68#endif
  69
  70#ifndef NO_ICONV
  71#include <iconv.h>
  72#endif
  73
  74/* On most systems <limits.h> would have given us this, but
  75 * not on some systems (e.g. GNU/Hurd).
  76 */
  77#ifndef PATH_MAX
  78#define PATH_MAX 4096
  79#endif
  80
  81#ifndef PRIuMAX
  82#define PRIuMAX "llu"
  83#endif
  84
  85#ifdef __GNUC__
  86#define NORETURN __attribute__((__noreturn__))
  87#else
  88#define NORETURN
  89#ifndef __attribute__
  90#define __attribute__(x)
  91#endif
  92#endif
  93
  94/* General helper functions */
  95extern void usage(const char *err) NORETURN;
  96extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  97extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  98extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
  99
 100extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 101extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 102extern void set_error_routine(void (*routine)(const char *err, va_list params));
 103extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 104
 105#ifdef NO_MMAP
 106
 107#ifndef PROT_READ
 108#define PROT_READ 1
 109#define PROT_WRITE 2
 110#define MAP_PRIVATE 1
 111#define MAP_FAILED ((void*)-1)
 112#endif
 113
 114#define mmap git_mmap
 115#define munmap git_munmap
 116extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 117extern int git_munmap(void *start, size_t length);
 118
 119/* This value must be multiple of (pagesize * 2) */
 120#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 121
 122#else /* NO_MMAP */
 123
 124#include <sys/mman.h>
 125
 126/* This value must be multiple of (pagesize * 2) */
 127#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 128        (sizeof(void*) >= 8 \
 129                ?  1 * 1024 * 1024 * 1024 \
 130                : 32 * 1024 * 1024)
 131
 132#endif /* NO_MMAP */
 133
 134#define DEFAULT_PACKED_GIT_LIMIT \
 135        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 136
 137#ifdef NO_PREAD
 138#define pread git_pread
 139extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 140#endif
 141
 142#ifdef NO_SETENV
 143#define setenv gitsetenv
 144extern int gitsetenv(const char *, const char *, int);
 145#endif
 146
 147#ifdef NO_UNSETENV
 148#define unsetenv gitunsetenv
 149extern void gitunsetenv(const char *);
 150#endif
 151
 152#ifdef NO_STRCASESTR
 153#define strcasestr gitstrcasestr
 154extern char *gitstrcasestr(const char *haystack, const char *needle);
 155#endif
 156
 157#ifdef NO_STRLCPY
 158#define strlcpy gitstrlcpy
 159extern size_t gitstrlcpy(char *, const char *, size_t);
 160#endif
 161
 162#ifdef NO_STRTOUMAX
 163#define strtoumax gitstrtoumax
 164extern uintmax_t gitstrtoumax(const char *, char **, int);
 165#endif
 166
 167extern void release_pack_memory(size_t, int);
 168
 169static inline char* xstrdup(const char *str)
 170{
 171        char *ret = strdup(str);
 172        if (!ret) {
 173                release_pack_memory(strlen(str) + 1, -1);
 174                ret = strdup(str);
 175                if (!ret)
 176                        die("Out of memory, strdup failed");
 177        }
 178        return ret;
 179}
 180
 181static inline void *xmalloc(size_t size)
 182{
 183        void *ret = malloc(size);
 184        if (!ret && !size)
 185                ret = malloc(1);
 186        if (!ret) {
 187                release_pack_memory(size, -1);
 188                ret = malloc(size);
 189                if (!ret && !size)
 190                        ret = malloc(1);
 191                if (!ret)
 192                        die("Out of memory, malloc failed");
 193        }
 194#ifdef XMALLOC_POISON
 195        memset(ret, 0xA5, size);
 196#endif
 197        return ret;
 198}
 199
 200static inline char *xstrndup(const char *str, size_t len)
 201{
 202        char *p;
 203
 204        p = memchr(str, '\0', len);
 205        if (p)
 206                len = p - str;
 207        p = xmalloc(len + 1);
 208        memcpy(p, str, len);
 209        p[len] = '\0';
 210        return p;
 211}
 212
 213static inline void *xrealloc(void *ptr, size_t size)
 214{
 215        void *ret = realloc(ptr, size);
 216        if (!ret && !size)
 217                ret = realloc(ptr, 1);
 218        if (!ret) {
 219                release_pack_memory(size, -1);
 220                ret = realloc(ptr, size);
 221                if (!ret && !size)
 222                        ret = realloc(ptr, 1);
 223                if (!ret)
 224                        die("Out of memory, realloc failed");
 225        }
 226        return ret;
 227}
 228
 229static inline void *xcalloc(size_t nmemb, size_t size)
 230{
 231        void *ret = calloc(nmemb, size);
 232        if (!ret && (!nmemb || !size))
 233                ret = calloc(1, 1);
 234        if (!ret) {
 235                release_pack_memory(nmemb * size, -1);
 236                ret = calloc(nmemb, size);
 237                if (!ret && (!nmemb || !size))
 238                        ret = calloc(1, 1);
 239                if (!ret)
 240                        die("Out of memory, calloc failed");
 241        }
 242        return ret;
 243}
 244
 245static inline void *xmmap(void *start, size_t length,
 246        int prot, int flags, int fd, off_t offset)
 247{
 248        void *ret = mmap(start, length, prot, flags, fd, offset);
 249        if (ret == MAP_FAILED) {
 250                if (!length)
 251                        return NULL;
 252                release_pack_memory(length, fd);
 253                ret = mmap(start, length, prot, flags, fd, offset);
 254                if (ret == MAP_FAILED)
 255                        die("Out of memory? mmap failed: %s", strerror(errno));
 256        }
 257        return ret;
 258}
 259
 260static inline ssize_t xread(int fd, void *buf, size_t len)
 261{
 262        ssize_t nr;
 263        while (1) {
 264                nr = read(fd, buf, len);
 265                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 266                        continue;
 267                return nr;
 268        }
 269}
 270
 271static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 272{
 273        ssize_t nr;
 274        while (1) {
 275                nr = write(fd, buf, len);
 276                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 277                        continue;
 278                return nr;
 279        }
 280}
 281
 282static inline size_t xsize_t(off_t len)
 283{
 284        return (size_t)len;
 285}
 286
 287static inline int has_extension(const char *filename, const char *ext)
 288{
 289        size_t len = strlen(filename);
 290        size_t extlen = strlen(ext);
 291        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 292}
 293
 294/* Sane ctype - no locale, and works with signed chars */
 295#undef isspace
 296#undef isdigit
 297#undef isalpha
 298#undef isalnum
 299#undef tolower
 300#undef toupper
 301extern unsigned char sane_ctype[256];
 302#define GIT_SPACE 0x01
 303#define GIT_DIGIT 0x02
 304#define GIT_ALPHA 0x04
 305#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 306#define isspace(x) sane_istest(x,GIT_SPACE)
 307#define isdigit(x) sane_istest(x,GIT_DIGIT)
 308#define isalpha(x) sane_istest(x,GIT_ALPHA)
 309#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 310#define tolower(x) sane_case((unsigned char)(x), 0x20)
 311#define toupper(x) sane_case((unsigned char)(x), 0)
 312
 313static inline int sane_case(int x, int high)
 314{
 315        if (sane_istest(x, GIT_ALPHA))
 316                x = (x & ~0x20) | high;
 317        return x;
 318}
 319
 320static inline int prefixcmp(const char *str, const char *prefix)
 321{
 322        return strncmp(str, prefix, strlen(prefix));
 323}
 324
 325static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 326{
 327        unsigned long ul;
 328        char *p;
 329
 330        errno = 0;
 331        ul = strtoul(s, &p, base);
 332        if (errno || *p || p == s || (unsigned int) ul != ul)
 333                return -1;
 334        *result = ul;
 335        return 0;
 336}
 337
 338#endif