Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit cherry-pick: Suggest a better method to retain authorship (f52463a)
   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#if !defined(__APPLE__) && !defined(__FreeBSD__)
  17#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  18#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  19#endif
  20#define _ALL_SOURCE 1
  21#define _GNU_SOURCE 1
  22#define _BSD_SOURCE 1
  23
  24#include <unistd.h>
  25#include <stdio.h>
  26#include <sys/stat.h>
  27#include <fcntl.h>
  28#include <stddef.h>
  29#include <stdlib.h>
  30#include <stdarg.h>
  31#include <string.h>
  32#include <errno.h>
  33#include <limits.h>
  34#include <sys/param.h>
  35#include <sys/types.h>
  36#include <dirent.h>
  37#include <sys/time.h>
  38#include <time.h>
  39#include <signal.h>
  40#include <sys/wait.h>
  41#include <fnmatch.h>
  42#include <sys/poll.h>
  43#include <sys/socket.h>
  44#include <assert.h>
  45#include <regex.h>
  46#include <netinet/in.h>
  47#include <netinet/tcp.h>
  48#include <arpa/inet.h>
  49#include <netdb.h>
  50#include <pwd.h>
  51#include <inttypes.h>
  52#if defined(__CYGWIN__)
  53#undef _XOPEN_SOURCE
  54#include <grp.h>
  55#define _XOPEN_SOURCE 600
  56#else
  57#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  58#include <grp.h>
  59#define _ALL_SOURCE 1
  60#endif
  61
  62#ifndef NO_ICONV
  63#include <iconv.h>
  64#endif
  65
  66/* On most systems <limits.h> would have given us this, but
  67 * not on some systems (e.g. GNU/Hurd).
  68 */
  69#ifndef PATH_MAX
  70#define PATH_MAX 4096
  71#endif
  72
  73#ifdef __GNUC__
  74#define NORETURN __attribute__((__noreturn__))
  75#else
  76#define NORETURN
  77#ifndef __attribute__
  78#define __attribute__(x)
  79#endif
  80#endif
  81
  82/* General helper functions */
  83extern void usage(const char *err) NORETURN;
  84extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  85extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  86extern void warn(const char *err, ...) __attribute__((format (printf, 1, 2)));
  87
  88extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  89extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  90extern void set_error_routine(void (*routine)(const char *err, va_list params));
  91extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  92
  93#ifdef NO_MMAP
  94
  95#ifndef PROT_READ
  96#define PROT_READ 1
  97#define PROT_WRITE 2
  98#define MAP_PRIVATE 1
  99#define MAP_FAILED ((void*)-1)
 100#endif
 101
 102#define mmap git_mmap
 103#define munmap git_munmap
 104extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 105extern int git_munmap(void *start, size_t length);
 106
 107/* This value must be multiple of (pagesize * 2) */
 108#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 109
 110#else /* NO_MMAP */
 111
 112#include <sys/mman.h>
 113
 114/* This value must be multiple of (pagesize * 2) */
 115#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 116        (sizeof(void*) >= 8 \
 117                ?  1 * 1024 * 1024 * 1024 \
 118                : 32 * 1024 * 1024)
 119
 120#endif /* NO_MMAP */
 121
 122#define DEFAULT_PACKED_GIT_LIMIT \
 123        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 124
 125#ifdef NO_PREAD
 126#define pread git_pread
 127extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 128#endif
 129
 130#ifdef NO_SETENV
 131#define setenv gitsetenv
 132extern int gitsetenv(const char *, const char *, int);
 133#endif
 134
 135#ifdef NO_UNSETENV
 136#define unsetenv gitunsetenv
 137extern void gitunsetenv(const char *);
 138#endif
 139
 140#ifdef NO_STRCASESTR
 141#define strcasestr gitstrcasestr
 142extern char *gitstrcasestr(const char *haystack, const char *needle);
 143#endif
 144
 145#ifdef NO_STRLCPY
 146#define strlcpy gitstrlcpy
 147extern size_t gitstrlcpy(char *, const char *, size_t);
 148#endif
 149
 150#ifdef NO_STRTOUMAX
 151#define strtoumax gitstrtoumax
 152extern uintmax_t gitstrtoumax(const char *, char **, int);
 153#endif
 154
 155extern void release_pack_memory(size_t);
 156
 157static inline char* xstrdup(const char *str)
 158{
 159        char *ret = strdup(str);
 160        if (!ret) {
 161                release_pack_memory(strlen(str) + 1);
 162                ret = strdup(str);
 163                if (!ret)
 164                        die("Out of memory, strdup failed");
 165        }
 166        return ret;
 167}
 168
 169static inline void *xmalloc(size_t size)
 170{
 171        void *ret = malloc(size);
 172        if (!ret && !size)
 173                ret = malloc(1);
 174        if (!ret) {
 175                release_pack_memory(size);
 176                ret = malloc(size);
 177                if (!ret && !size)
 178                        ret = malloc(1);
 179                if (!ret)
 180                        die("Out of memory, malloc failed");
 181        }
 182#ifdef XMALLOC_POISON
 183        memset(ret, 0xA5, size);
 184#endif
 185        return ret;
 186}
 187
 188static inline void *xrealloc(void *ptr, size_t size)
 189{
 190        void *ret = realloc(ptr, size);
 191        if (!ret && !size)
 192                ret = realloc(ptr, 1);
 193        if (!ret) {
 194                release_pack_memory(size);
 195                ret = realloc(ptr, size);
 196                if (!ret && !size)
 197                        ret = realloc(ptr, 1);
 198                if (!ret)
 199                        die("Out of memory, realloc failed");
 200        }
 201        return ret;
 202}
 203
 204static inline void *xcalloc(size_t nmemb, size_t size)
 205{
 206        void *ret = calloc(nmemb, size);
 207        if (!ret && (!nmemb || !size))
 208                ret = calloc(1, 1);
 209        if (!ret) {
 210                release_pack_memory(nmemb * size);
 211                ret = calloc(nmemb, size);
 212                if (!ret && (!nmemb || !size))
 213                        ret = calloc(1, 1);
 214                if (!ret)
 215                        die("Out of memory, calloc failed");
 216        }
 217        return ret;
 218}
 219
 220static inline void *xmmap(void *start, size_t length,
 221        int prot, int flags, int fd, off_t offset)
 222{
 223        void *ret = mmap(start, length, prot, flags, fd, offset);
 224        if (ret == MAP_FAILED) {
 225                if (!length)
 226                        return NULL;
 227                release_pack_memory(length);
 228                ret = mmap(start, length, prot, flags, fd, offset);
 229                if (ret == MAP_FAILED)
 230                        die("Out of memory? mmap failed: %s", strerror(errno));
 231        }
 232        return ret;
 233}
 234
 235static inline ssize_t xread(int fd, void *buf, size_t len)
 236{
 237        ssize_t nr;
 238        while (1) {
 239                nr = read(fd, buf, len);
 240                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 241                        continue;
 242                return nr;
 243        }
 244}
 245
 246static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 247{
 248        ssize_t nr;
 249        while (1) {
 250                nr = write(fd, buf, len);
 251                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 252                        continue;
 253                return nr;
 254        }
 255}
 256
 257static inline int has_extension(const char *filename, const char *ext)
 258{
 259        size_t len = strlen(filename);
 260        size_t extlen = strlen(ext);
 261        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 262}
 263
 264/* Sane ctype - no locale, and works with signed chars */
 265#undef isspace
 266#undef isdigit
 267#undef isalpha
 268#undef isalnum
 269#undef tolower
 270#undef toupper
 271extern unsigned char sane_ctype[256];
 272#define GIT_SPACE 0x01
 273#define GIT_DIGIT 0x02
 274#define GIT_ALPHA 0x04
 275#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 276#define isspace(x) sane_istest(x,GIT_SPACE)
 277#define isdigit(x) sane_istest(x,GIT_DIGIT)
 278#define isalpha(x) sane_istest(x,GIT_ALPHA)
 279#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 280#define tolower(x) sane_case((unsigned char)(x), 0x20)
 281#define toupper(x) sane_case((unsigned char)(x), 0)
 282
 283static inline int sane_case(int x, int high)
 284{
 285        if (sane_istest(x, GIT_ALPHA))
 286                x = (x & ~0x20) | high;
 287        return x;
 288}
 289
 290static inline int prefixcmp(const char *str, const char *prefix)
 291{
 292        return strncmp(str, prefix, strlen(prefix));
 293}
 294
 295#endif