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/* 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 <sys/ioctl.h>
  56#include <sys/select.h>
  57#include <assert.h>
  58#include <regex.h>
  59#include <netinet/in.h>
  60#include <netinet/tcp.h>
  61#include <arpa/inet.h>
  62#include <netdb.h>
  63#include <pwd.h>
  64#include <inttypes.h>
  65#if defined(__CYGWIN__)
  66#undef _XOPEN_SOURCE
  67#include <grp.h>
  68#define _XOPEN_SOURCE 600
  69#else
  70#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  71#include <grp.h>
  72#define _ALL_SOURCE 1
  73#endif
  74
  75#ifndef NO_ICONV
  76#include <iconv.h>
  77#endif
  78
  79/* On most systems <limits.h> would have given us this, but
  80 * not on some systems (e.g. GNU/Hurd).
  81 */
  82#ifndef PATH_MAX
  83#define PATH_MAX 4096
  84#endif
  85
  86#ifndef PRIuMAX
  87#define PRIuMAX "llu"
  88#endif
  89
  90#ifdef __GNUC__
  91#define NORETURN __attribute__((__noreturn__))
  92#else
  93#define NORETURN
  94#ifndef __attribute__
  95#define __attribute__(x)
  96#endif
  97#endif
  98
  99/* General helper functions */
 100extern void usage(const char *err) NORETURN;
 101extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 102extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 103extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 104
 105extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 106extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 107extern void set_error_routine(void (*routine)(const char *err, va_list params));
 108extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 109
 110#ifdef NO_MMAP
 111
 112#ifndef PROT_READ
 113#define PROT_READ 1
 114#define PROT_WRITE 2
 115#define MAP_PRIVATE 1
 116#define MAP_FAILED ((void*)-1)
 117#endif
 118
 119#define mmap git_mmap
 120#define munmap git_munmap
 121extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 122extern int git_munmap(void *start, size_t length);
 123
 124/* This value must be multiple of (pagesize * 2) */
 125#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 126
 127#else /* NO_MMAP */
 128
 129#include <sys/mman.h>
 130
 131/* This value must be multiple of (pagesize * 2) */
 132#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 133        (sizeof(void*) >= 8 \
 134                ?  1 * 1024 * 1024 * 1024 \
 135                : 32 * 1024 * 1024)
 136
 137#endif /* NO_MMAP */
 138
 139#define DEFAULT_PACKED_GIT_LIMIT \
 140        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 141
 142#ifdef NO_PREAD
 143#define pread git_pread
 144extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 145#endif
 146
 147#ifdef NO_SETENV
 148#define setenv gitsetenv
 149extern int gitsetenv(const char *, const char *, int);
 150#endif
 151
 152#ifdef NO_MKDTEMP
 153#define mkdtemp gitmkdtemp
 154extern char *gitmkdtemp(char *);
 155#endif
 156
 157#ifdef NO_UNSETENV
 158#define unsetenv gitunsetenv
 159extern void gitunsetenv(const char *);
 160#endif
 161
 162#ifdef NO_STRCASESTR
 163#define strcasestr gitstrcasestr
 164extern char *gitstrcasestr(const char *haystack, const char *needle);
 165#endif
 166
 167#ifdef NO_STRLCPY
 168#define strlcpy gitstrlcpy
 169extern size_t gitstrlcpy(char *, const char *, size_t);
 170#endif
 171
 172#ifdef NO_STRTOUMAX
 173#define strtoumax gitstrtoumax
 174extern uintmax_t gitstrtoumax(const char *, char **, int);
 175#endif
 176
 177#ifdef NO_HSTRERROR
 178#define hstrerror githstrerror
 179extern const char *githstrerror(int herror);
 180#endif
 181
 182#ifdef NO_MEMMEM
 183#define memmem gitmemmem
 184void *gitmemmem(const void *haystack, size_t haystacklen,
 185                const void *needle, size_t needlelen);
 186#endif
 187
 188#ifdef __GLIBC_PREREQ
 189#if __GLIBC_PREREQ(2, 1)
 190#define HAVE_STRCHRNUL
 191#endif
 192#endif
 193
 194#ifndef HAVE_STRCHRNUL
 195#define strchrnul gitstrchrnul
 196static inline char *gitstrchrnul(const char *s, int c)
 197{
 198        while (*s && *s != c)
 199                s++;
 200        return (char *)s;
 201}
 202#endif
 203
 204extern void release_pack_memory(size_t, int);
 205
 206static inline char* xstrdup(const char *str)
 207{
 208        char *ret = strdup(str);
 209        if (!ret) {
 210                release_pack_memory(strlen(str) + 1, -1);
 211                ret = strdup(str);
 212                if (!ret)
 213                        die("Out of memory, strdup failed");
 214        }
 215        return ret;
 216}
 217
 218static inline void *xmalloc(size_t size)
 219{
 220        void *ret = malloc(size);
 221        if (!ret && !size)
 222                ret = malloc(1);
 223        if (!ret) {
 224                release_pack_memory(size, -1);
 225                ret = malloc(size);
 226                if (!ret && !size)
 227                        ret = malloc(1);
 228                if (!ret)
 229                        die("Out of memory, malloc failed");
 230        }
 231#ifdef XMALLOC_POISON
 232        memset(ret, 0xA5, size);
 233#endif
 234        return ret;
 235}
 236
 237static inline void *xmemdupz(const void *data, size_t len)
 238{
 239        char *p = xmalloc(len + 1);
 240        memcpy(p, data, len);
 241        p[len] = '\0';
 242        return p;
 243}
 244
 245static inline char *xstrndup(const char *str, size_t len)
 246{
 247        char *p = memchr(str, '\0', len);
 248        return xmemdupz(str, p ? p - str : len);
 249}
 250
 251static inline void *xrealloc(void *ptr, size_t size)
 252{
 253        void *ret = realloc(ptr, size);
 254        if (!ret && !size)
 255                ret = realloc(ptr, 1);
 256        if (!ret) {
 257                release_pack_memory(size, -1);
 258                ret = realloc(ptr, size);
 259                if (!ret && !size)
 260                        ret = realloc(ptr, 1);
 261                if (!ret)
 262                        die("Out of memory, realloc failed");
 263        }
 264        return ret;
 265}
 266
 267static inline void *xcalloc(size_t nmemb, size_t size)
 268{
 269        void *ret = calloc(nmemb, size);
 270        if (!ret && (!nmemb || !size))
 271                ret = calloc(1, 1);
 272        if (!ret) {
 273                release_pack_memory(nmemb * size, -1);
 274                ret = calloc(nmemb, size);
 275                if (!ret && (!nmemb || !size))
 276                        ret = calloc(1, 1);
 277                if (!ret)
 278                        die("Out of memory, calloc failed");
 279        }
 280        return ret;
 281}
 282
 283static inline void *xmmap(void *start, size_t length,
 284        int prot, int flags, int fd, off_t offset)
 285{
 286        void *ret = mmap(start, length, prot, flags, fd, offset);
 287        if (ret == MAP_FAILED) {
 288                if (!length)
 289                        return NULL;
 290                release_pack_memory(length, fd);
 291                ret = mmap(start, length, prot, flags, fd, offset);
 292                if (ret == MAP_FAILED)
 293                        die("Out of memory? mmap failed: %s", strerror(errno));
 294        }
 295        return ret;
 296}
 297
 298static inline ssize_t xread(int fd, void *buf, size_t len)
 299{
 300        ssize_t nr;
 301        while (1) {
 302                nr = read(fd, buf, len);
 303                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 304                        continue;
 305                return nr;
 306        }
 307}
 308
 309static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 310{
 311        ssize_t nr;
 312        while (1) {
 313                nr = write(fd, buf, len);
 314                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 315                        continue;
 316                return nr;
 317        }
 318}
 319
 320static inline int xdup(int fd)
 321{
 322        int ret = dup(fd);
 323        if (ret < 0)
 324                die("dup failed: %s", strerror(errno));
 325        return ret;
 326}
 327
 328static inline FILE *xfdopen(int fd, const char *mode)
 329{
 330        FILE *stream = fdopen(fd, mode);
 331        if (stream == NULL)
 332                die("Out of memory? fdopen failed: %s", strerror(errno));
 333        return stream;
 334}
 335
 336static inline int xmkstemp(char *template)
 337{
 338        int fd;
 339
 340        fd = mkstemp(template);
 341        if (fd < 0)
 342                die("Unable to create temporary file: %s", strerror(errno));
 343        return fd;
 344}
 345
 346static inline size_t xsize_t(off_t len)
 347{
 348        return (size_t)len;
 349}
 350
 351static inline int has_extension(const char *filename, const char *ext)
 352{
 353        size_t len = strlen(filename);
 354        size_t extlen = strlen(ext);
 355        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 356}
 357
 358/* Sane ctype - no locale, and works with signed chars */
 359#undef isspace
 360#undef isdigit
 361#undef isalpha
 362#undef isalnum
 363#undef tolower
 364#undef toupper
 365extern unsigned char sane_ctype[256];
 366#define GIT_SPACE 0x01
 367#define GIT_DIGIT 0x02
 368#define GIT_ALPHA 0x04
 369#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 370#define isspace(x) sane_istest(x,GIT_SPACE)
 371#define isdigit(x) sane_istest(x,GIT_DIGIT)
 372#define isalpha(x) sane_istest(x,GIT_ALPHA)
 373#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 374#define tolower(x) sane_case((unsigned char)(x), 0x20)
 375#define toupper(x) sane_case((unsigned char)(x), 0)
 376
 377static inline int sane_case(int x, int high)
 378{
 379        if (sane_istest(x, GIT_ALPHA))
 380                x = (x & ~0x20) | high;
 381        return x;
 382}
 383
 384static inline int prefixcmp(const char *str, const char *prefix)
 385{
 386        return strncmp(str, prefix, strlen(prefix));
 387}
 388
 389static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 390{
 391        unsigned long ul;
 392        char *p;
 393
 394        errno = 0;
 395        ul = strtoul(s, &p, base);
 396        if (errno || *p || p == s || (unsigned int) ul != ul)
 397                return -1;
 398        *result = ul;
 399        return 0;
 400}
 401
 402static inline int strtol_i(char const *s, int base, int *result)
 403{
 404        long ul;
 405        char *p;
 406
 407        errno = 0;
 408        ul = strtol(s, &p, base);
 409        if (errno || *p || p == s || (int) ul != ul)
 410                return -1;
 411        *result = ul;
 412        return 0;
 413}
 414
 415#endif