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#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  24
  25/* Approximation of the length of the decimal representation of this type. */
  26#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  27
  28#if !defined(__APPLE__) && !defined(__FreeBSD__)
  29#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  30#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  31#endif
  32#define _ALL_SOURCE 1
  33#define _GNU_SOURCE 1
  34#define _BSD_SOURCE 1
  35
  36#include <unistd.h>
  37#include <stdio.h>
  38#include <sys/stat.h>
  39#include <fcntl.h>
  40#include <stddef.h>
  41#include <stdlib.h>
  42#include <stdarg.h>
  43#include <string.h>
  44#include <errno.h>
  45#include <limits.h>
  46#include <sys/param.h>
  47#include <sys/types.h>
  48#include <dirent.h>
  49#include <sys/time.h>
  50#include <time.h>
  51#include <signal.h>
  52#include <sys/wait.h>
  53#include <fnmatch.h>
  54#include <sys/poll.h>
  55#include <sys/socket.h>
  56#include <assert.h>
  57#include <regex.h>
  58#include <netinet/in.h>
  59#include <netinet/tcp.h>
  60#include <arpa/inet.h>
  61#include <netdb.h>
  62#include <pwd.h>
  63#include <inttypes.h>
  64#if defined(__CYGWIN__)
  65#undef _XOPEN_SOURCE
  66#include <grp.h>
  67#define _XOPEN_SOURCE 600
  68#else
  69#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  70#include <grp.h>
  71#define _ALL_SOURCE 1
  72#endif
  73
  74#ifndef NO_ICONV
  75#include <iconv.h>
  76#endif
  77
  78/* On most systems <limits.h> would have given us this, but
  79 * not on some systems (e.g. GNU/Hurd).
  80 */
  81#ifndef PATH_MAX
  82#define PATH_MAX 4096
  83#endif
  84
  85#ifndef PRIuMAX
  86#define PRIuMAX "llu"
  87#endif
  88
  89#ifdef __GNUC__
  90#define NORETURN __attribute__((__noreturn__))
  91#else
  92#define NORETURN
  93#ifndef __attribute__
  94#define __attribute__(x)
  95#endif
  96#endif
  97
  98/* General helper functions */
  99extern void usage(const char *err) NORETURN;
 100extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 101extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 102extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 103
 104extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 105extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 106extern void set_error_routine(void (*routine)(const char *err, va_list params));
 107extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 108
 109#ifdef NO_MMAP
 110
 111#ifndef PROT_READ
 112#define PROT_READ 1
 113#define PROT_WRITE 2
 114#define MAP_PRIVATE 1
 115#define MAP_FAILED ((void*)-1)
 116#endif
 117
 118#define mmap git_mmap
 119#define munmap git_munmap
 120extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 121extern int git_munmap(void *start, size_t length);
 122
 123/* This value must be multiple of (pagesize * 2) */
 124#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 125
 126#else /* NO_MMAP */
 127
 128#include <sys/mman.h>
 129
 130/* This value must be multiple of (pagesize * 2) */
 131#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 132        (sizeof(void*) >= 8 \
 133                ?  1 * 1024 * 1024 * 1024 \
 134                : 32 * 1024 * 1024)
 135
 136#endif /* NO_MMAP */
 137
 138#define DEFAULT_PACKED_GIT_LIMIT \
 139        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 140
 141#ifdef NO_PREAD
 142#define pread git_pread
 143extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 144#endif
 145
 146#ifdef NO_SETENV
 147#define setenv gitsetenv
 148extern int gitsetenv(const char *, const char *, int);
 149#endif
 150
 151#ifdef NO_MKDTEMP
 152#define mkdtemp gitmkdtemp
 153extern char *gitmkdtemp(char *);
 154#endif
 155
 156#ifdef NO_UNSETENV
 157#define unsetenv gitunsetenv
 158extern void gitunsetenv(const char *);
 159#endif
 160
 161#ifdef NO_STRCASESTR
 162#define strcasestr gitstrcasestr
 163extern char *gitstrcasestr(const char *haystack, const char *needle);
 164#endif
 165
 166#ifdef NO_STRLCPY
 167#define strlcpy gitstrlcpy
 168extern size_t gitstrlcpy(char *, const char *, size_t);
 169#endif
 170
 171#ifdef NO_STRTOUMAX
 172#define strtoumax gitstrtoumax
 173extern uintmax_t gitstrtoumax(const char *, char **, int);
 174#endif
 175
 176#ifdef NO_HSTRERROR
 177#define hstrerror githstrerror
 178extern const char *githstrerror(int herror);
 179#endif
 180
 181#ifdef NO_MEMMEM
 182#define memmem gitmemmem
 183void *gitmemmem(const void *haystack, size_t haystacklen,
 184                const void *needle, size_t needlelen);
 185#endif
 186
 187extern void release_pack_memory(size_t, int);
 188
 189static inline char* xstrdup(const char *str)
 190{
 191        char *ret = strdup(str);
 192        if (!ret) {
 193                release_pack_memory(strlen(str) + 1, -1);
 194                ret = strdup(str);
 195                if (!ret)
 196                        die("Out of memory, strdup failed");
 197        }
 198        return ret;
 199}
 200
 201static inline void *xmalloc(size_t size)
 202{
 203        void *ret = malloc(size);
 204        if (!ret && !size)
 205                ret = malloc(1);
 206        if (!ret) {
 207                release_pack_memory(size, -1);
 208                ret = malloc(size);
 209                if (!ret && !size)
 210                        ret = malloc(1);
 211                if (!ret)
 212                        die("Out of memory, malloc failed");
 213        }
 214#ifdef XMALLOC_POISON
 215        memset(ret, 0xA5, size);
 216#endif
 217        return ret;
 218}
 219
 220static inline void *xmemdupz(const void *data, size_t len)
 221{
 222        char *p = xmalloc(len + 1);
 223        memcpy(p, data, len);
 224        p[len] = '\0';
 225        return p;
 226}
 227
 228static inline char *xstrndup(const char *str, size_t len)
 229{
 230        char *p = memchr(str, '\0', len);
 231        return xmemdupz(str, p ? p - str : len);
 232}
 233
 234static inline void *xrealloc(void *ptr, size_t size)
 235{
 236        void *ret = realloc(ptr, size);
 237        if (!ret && !size)
 238                ret = realloc(ptr, 1);
 239        if (!ret) {
 240                release_pack_memory(size, -1);
 241                ret = realloc(ptr, size);
 242                if (!ret && !size)
 243                        ret = realloc(ptr, 1);
 244                if (!ret)
 245                        die("Out of memory, realloc failed");
 246        }
 247        return ret;
 248}
 249
 250static inline void *xcalloc(size_t nmemb, size_t size)
 251{
 252        void *ret = calloc(nmemb, size);
 253        if (!ret && (!nmemb || !size))
 254                ret = calloc(1, 1);
 255        if (!ret) {
 256                release_pack_memory(nmemb * size, -1);
 257                ret = calloc(nmemb, size);
 258                if (!ret && (!nmemb || !size))
 259                        ret = calloc(1, 1);
 260                if (!ret)
 261                        die("Out of memory, calloc failed");
 262        }
 263        return ret;
 264}
 265
 266static inline void *xmmap(void *start, size_t length,
 267        int prot, int flags, int fd, off_t offset)
 268{
 269        void *ret = mmap(start, length, prot, flags, fd, offset);
 270        if (ret == MAP_FAILED) {
 271                if (!length)
 272                        return NULL;
 273                release_pack_memory(length, fd);
 274                ret = mmap(start, length, prot, flags, fd, offset);
 275                if (ret == MAP_FAILED)
 276                        die("Out of memory? mmap failed: %s", strerror(errno));
 277        }
 278        return ret;
 279}
 280
 281static inline ssize_t xread(int fd, void *buf, size_t len)
 282{
 283        ssize_t nr;
 284        while (1) {
 285                nr = read(fd, buf, len);
 286                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 287                        continue;
 288                return nr;
 289        }
 290}
 291
 292static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 293{
 294        ssize_t nr;
 295        while (1) {
 296                nr = write(fd, buf, len);
 297                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 298                        continue;
 299                return nr;
 300        }
 301}
 302
 303static inline int xdup(int fd)
 304{
 305        int ret = dup(fd);
 306        if (ret < 0)
 307                die("dup failed: %s", strerror(errno));
 308        return ret;
 309}
 310
 311static inline FILE *xfdopen(int fd, const char *mode)
 312{
 313        FILE *stream = fdopen(fd, mode);
 314        if (stream == NULL)
 315                die("Out of memory? fdopen failed: %s", strerror(errno));
 316        return stream;
 317}
 318
 319static inline int xmkstemp(char *template)
 320{
 321        int fd;
 322
 323        fd = mkstemp(template);
 324        if (fd < 0)
 325                die("Unable to create temporary file: %s", strerror(errno));
 326        return fd;
 327}
 328
 329static inline size_t xsize_t(off_t len)
 330{
 331        return (size_t)len;
 332}
 333
 334static inline int has_extension(const char *filename, const char *ext)
 335{
 336        size_t len = strlen(filename);
 337        size_t extlen = strlen(ext);
 338        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 339}
 340
 341/* Sane ctype - no locale, and works with signed chars */
 342#undef isspace
 343#undef isdigit
 344#undef isalpha
 345#undef isalnum
 346#undef tolower
 347#undef toupper
 348extern unsigned char sane_ctype[256];
 349#define GIT_SPACE 0x01
 350#define GIT_DIGIT 0x02
 351#define GIT_ALPHA 0x04
 352#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 353#define isspace(x) sane_istest(x,GIT_SPACE)
 354#define isdigit(x) sane_istest(x,GIT_DIGIT)
 355#define isalpha(x) sane_istest(x,GIT_ALPHA)
 356#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 357#define tolower(x) sane_case((unsigned char)(x), 0x20)
 358#define toupper(x) sane_case((unsigned char)(x), 0)
 359
 360static inline int sane_case(int x, int high)
 361{
 362        if (sane_istest(x, GIT_ALPHA))
 363                x = (x & ~0x20) | high;
 364        return x;
 365}
 366
 367static inline int prefixcmp(const char *str, const char *prefix)
 368{
 369        return strncmp(str, prefix, strlen(prefix));
 370}
 371
 372static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 373{
 374        unsigned long ul;
 375        char *p;
 376
 377        errno = 0;
 378        ul = strtoul(s, &p, base);
 379        if (errno || *p || p == s || (unsigned int) ul != ul)
 380                return -1;
 381        *result = ul;
 382        return 0;
 383}
 384
 385static inline int strtol_i(char const *s, int base, int *result)
 386{
 387        long ul;
 388        char *p;
 389
 390        errno = 0;
 391        ul = strtol(s, &p, base);
 392        if (errno || *p || p == s || (int) ul != ul)
 393                return -1;
 394        *result = ul;
 395        return 0;
 396}
 397
 398#endif