Andrew's git - gitweb.git/blob

92d79673f8eddeb48b15dbbc3bff85fa39542b77
   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/* Approximation of the length of the decimal representation of this type. */
  25#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  26
  27#if !defined(__APPLE__) && !defined(__FreeBSD__)
  28#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  29#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  30#endif
  31#define _ALL_SOURCE 1
  32#define _GNU_SOURCE 1
  33#define _BSD_SOURCE 1
  34
  35#include <unistd.h>
  36#include <stdio.h>
  37#include <sys/stat.h>
  38#include <fcntl.h>
  39#include <stddef.h>
  40#include <stdlib.h>
  41#include <stdarg.h>
  42#include <string.h>
  43#include <errno.h>
  44#include <limits.h>
  45#include <sys/param.h>
  46#include <sys/types.h>
  47#include <dirent.h>
  48#include <sys/time.h>
  49#include <time.h>
  50#include <signal.h>
  51#include <sys/wait.h>
  52#include <fnmatch.h>
  53#include <sys/poll.h>
  54#include <sys/socket.h>
  55#include <assert.h>
  56#include <regex.h>
  57#include <netinet/in.h>
  58#include <netinet/tcp.h>
  59#include <arpa/inet.h>
  60#include <netdb.h>
  61#include <pwd.h>
  62#include <inttypes.h>
  63#if defined(__CYGWIN__)
  64#undef _XOPEN_SOURCE
  65#include <grp.h>
  66#define _XOPEN_SOURCE 600
  67#else
  68#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  69#include <grp.h>
  70#define _ALL_SOURCE 1
  71#endif
  72
  73#ifndef NO_ICONV
  74#include <iconv.h>
  75#endif
  76
  77/* On most systems <limits.h> would have given us this, but
  78 * not on some systems (e.g. GNU/Hurd).
  79 */
  80#ifndef PATH_MAX
  81#define PATH_MAX 4096
  82#endif
  83
  84#ifndef PRIuMAX
  85#define PRIuMAX "llu"
  86#endif
  87
  88#ifdef __GNUC__
  89#define NORETURN __attribute__((__noreturn__))
  90#else
  91#define NORETURN
  92#ifndef __attribute__
  93#define __attribute__(x)
  94#endif
  95#endif
  96
  97/* General helper functions */
  98extern void usage(const char *err) NORETURN;
  99extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 100extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 101extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 102
 103extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 104extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 105extern void set_error_routine(void (*routine)(const char *err, va_list params));
 106extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 107
 108#ifdef NO_MMAP
 109
 110#ifndef PROT_READ
 111#define PROT_READ 1
 112#define PROT_WRITE 2
 113#define MAP_PRIVATE 1
 114#define MAP_FAILED ((void*)-1)
 115#endif
 116
 117#define mmap git_mmap
 118#define munmap git_munmap
 119extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 120extern int git_munmap(void *start, size_t length);
 121
 122/* This value must be multiple of (pagesize * 2) */
 123#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 124
 125#else /* NO_MMAP */
 126
 127#include <sys/mman.h>
 128
 129/* This value must be multiple of (pagesize * 2) */
 130#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 131        (sizeof(void*) >= 8 \
 132                ?  1 * 1024 * 1024 * 1024 \
 133                : 32 * 1024 * 1024)
 134
 135#endif /* NO_MMAP */
 136
 137#define DEFAULT_PACKED_GIT_LIMIT \
 138        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 139
 140#ifdef NO_PREAD
 141#define pread git_pread
 142extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 143#endif
 144
 145#ifdef NO_SETENV
 146#define setenv gitsetenv
 147extern int gitsetenv(const char *, const char *, int);
 148#endif
 149
 150#ifdef NO_MKDTEMP
 151#define mkdtemp gitmkdtemp
 152extern char *gitmkdtemp(char *);
 153#endif
 154
 155#ifdef NO_UNSETENV
 156#define unsetenv gitunsetenv
 157extern void gitunsetenv(const char *);
 158#endif
 159
 160#ifdef NO_STRCASESTR
 161#define strcasestr gitstrcasestr
 162extern char *gitstrcasestr(const char *haystack, const char *needle);
 163#endif
 164
 165#ifdef NO_STRLCPY
 166#define strlcpy gitstrlcpy
 167extern size_t gitstrlcpy(char *, const char *, size_t);
 168#endif
 169
 170#ifdef NO_STRTOUMAX
 171#define strtoumax gitstrtoumax
 172extern uintmax_t gitstrtoumax(const char *, char **, int);
 173#endif
 174
 175#ifdef NO_HSTRERROR
 176#define hstrerror githstrerror
 177extern const char *githstrerror(int herror);
 178#endif
 179
 180#ifdef NO_MEMMEM
 181#define memmem gitmemmem
 182void *gitmemmem(const void *haystack, size_t haystacklen,
 183                const void *needle, size_t needlelen);
 184#endif
 185
 186#if !defined(__GLIBC_PREREQ) && !__GLIBC_PREREQ(2, 1)
 187#define strchrnul gitstrchrnul
 188static inline char *gitstrchrnul(const char *s, int c)
 189{
 190        while (*s && *s != c)
 191                s++;
 192        return (char *)s;
 193}
 194#endif
 195
 196extern void release_pack_memory(size_t, int);
 197
 198static inline char* xstrdup(const char *str)
 199{
 200        char *ret = strdup(str);
 201        if (!ret) {
 202                release_pack_memory(strlen(str) + 1, -1);
 203                ret = strdup(str);
 204                if (!ret)
 205                        die("Out of memory, strdup failed");
 206        }
 207        return ret;
 208}
 209
 210static inline void *xmalloc(size_t size)
 211{
 212        void *ret = malloc(size);
 213        if (!ret && !size)
 214                ret = malloc(1);
 215        if (!ret) {
 216                release_pack_memory(size, -1);
 217                ret = malloc(size);
 218                if (!ret && !size)
 219                        ret = malloc(1);
 220                if (!ret)
 221                        die("Out of memory, malloc failed");
 222        }
 223#ifdef XMALLOC_POISON
 224        memset(ret, 0xA5, size);
 225#endif
 226        return ret;
 227}
 228
 229static inline void *xmemdupz(const void *data, size_t len)
 230{
 231        char *p = xmalloc(len + 1);
 232        memcpy(p, data, len);
 233        p[len] = '\0';
 234        return p;
 235}
 236
 237static inline char *xstrndup(const char *str, size_t len)
 238{
 239        char *p = memchr(str, '\0', len);
 240        return xmemdupz(str, p ? p - str : len);
 241}
 242
 243static inline void *xrealloc(void *ptr, size_t size)
 244{
 245        void *ret = realloc(ptr, size);
 246        if (!ret && !size)
 247                ret = realloc(ptr, 1);
 248        if (!ret) {
 249                release_pack_memory(size, -1);
 250                ret = realloc(ptr, size);
 251                if (!ret && !size)
 252                        ret = realloc(ptr, 1);
 253                if (!ret)
 254                        die("Out of memory, realloc failed");
 255        }
 256        return ret;
 257}
 258
 259static inline void *xcalloc(size_t nmemb, size_t size)
 260{
 261        void *ret = calloc(nmemb, size);
 262        if (!ret && (!nmemb || !size))
 263                ret = calloc(1, 1);
 264        if (!ret) {
 265                release_pack_memory(nmemb * size, -1);
 266                ret = calloc(nmemb, size);
 267                if (!ret && (!nmemb || !size))
 268                        ret = calloc(1, 1);
 269                if (!ret)
 270                        die("Out of memory, calloc failed");
 271        }
 272        return ret;
 273}
 274
 275static inline void *xmmap(void *start, size_t length,
 276        int prot, int flags, int fd, off_t offset)
 277{
 278        void *ret = mmap(start, length, prot, flags, fd, offset);
 279        if (ret == MAP_FAILED) {
 280                if (!length)
 281                        return NULL;
 282                release_pack_memory(length, fd);
 283                ret = mmap(start, length, prot, flags, fd, offset);
 284                if (ret == MAP_FAILED)
 285                        die("Out of memory? mmap failed: %s", strerror(errno));
 286        }
 287        return ret;
 288}
 289
 290static inline ssize_t xread(int fd, void *buf, size_t len)
 291{
 292        ssize_t nr;
 293        while (1) {
 294                nr = read(fd, buf, len);
 295                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 296                        continue;
 297                return nr;
 298        }
 299}
 300
 301static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 302{
 303        ssize_t nr;
 304        while (1) {
 305                nr = write(fd, buf, len);
 306                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 307                        continue;
 308                return nr;
 309        }
 310}
 311
 312static inline int xdup(int fd)
 313{
 314        int ret = dup(fd);
 315        if (ret < 0)
 316                die("dup failed: %s", strerror(errno));
 317        return ret;
 318}
 319
 320static inline FILE *xfdopen(int fd, const char *mode)
 321{
 322        FILE *stream = fdopen(fd, mode);
 323        if (stream == NULL)
 324                die("Out of memory? fdopen failed: %s", strerror(errno));
 325        return stream;
 326}
 327
 328static inline int xmkstemp(char *template)
 329{
 330        int fd;
 331
 332        fd = mkstemp(template);
 333        if (fd < 0)
 334                die("Unable to create temporary file: %s", strerror(errno));
 335        return fd;
 336}
 337
 338static inline size_t xsize_t(off_t len)
 339{
 340        return (size_t)len;
 341}
 342
 343static inline int has_extension(const char *filename, const char *ext)
 344{
 345        size_t len = strlen(filename);
 346        size_t extlen = strlen(ext);
 347        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 348}
 349
 350/* Sane ctype - no locale, and works with signed chars */
 351#undef isspace
 352#undef isdigit
 353#undef isalpha
 354#undef isalnum
 355#undef tolower
 356#undef toupper
 357extern unsigned char sane_ctype[256];
 358#define GIT_SPACE 0x01
 359#define GIT_DIGIT 0x02
 360#define GIT_ALPHA 0x04
 361#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 362#define isspace(x) sane_istest(x,GIT_SPACE)
 363#define isdigit(x) sane_istest(x,GIT_DIGIT)
 364#define isalpha(x) sane_istest(x,GIT_ALPHA)
 365#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 366#define tolower(x) sane_case((unsigned char)(x), 0x20)
 367#define toupper(x) sane_case((unsigned char)(x), 0)
 368
 369static inline int sane_case(int x, int high)
 370{
 371        if (sane_istest(x, GIT_ALPHA))
 372                x = (x & ~0x20) | high;
 373        return x;
 374}
 375
 376static inline int prefixcmp(const char *str, const char *prefix)
 377{
 378        return strncmp(str, prefix, strlen(prefix));
 379}
 380
 381static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 382{
 383        unsigned long ul;
 384        char *p;
 385
 386        errno = 0;
 387        ul = strtoul(s, &p, base);
 388        if (errno || *p || p == s || (unsigned int) ul != ul)
 389                return -1;
 390        *result = ul;
 391        return 0;
 392}
 393
 394static inline int strtol_i(char const *s, int base, int *result)
 395{
 396        long ul;
 397        char *p;
 398
 399        errno = 0;
 400        ul = strtol(s, &p, base);
 401        if (errno || *p || p == s || (int) ul != ul)
 402                return -1;
 403        *result = ul;
 404        return 0;
 405}
 406
 407#endif