Andrew's git - gitweb.git/blob

   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#ifndef FLEX_ARRAY
   5#if defined(__GNUC__) && (__GNUC__ < 3)
   6#define FLEX_ARRAY 0
   7#else
   8#define FLEX_ARRAY /* empty */
   9#endif
  10#endif
  11
  12#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  13
  14#include <unistd.h>
  15#include <stdio.h>
  16#include <sys/stat.h>
  17#include <fcntl.h>
  18#include <stddef.h>
  19#include <stdlib.h>
  20#include <stdarg.h>
  21#include <string.h>
  22#include <errno.h>
  23#include <limits.h>
  24#include <sys/param.h>
  25#include <netinet/in.h>
  26#include <sys/types.h>
  27#include <dirent.h>
  28
  29/* On most systems <limits.h> would have given us this, but
  30 * not on some systems (e.g. GNU/Hurd).
  31 */
  32#ifndef PATH_MAX
  33#define PATH_MAX 4096
  34#endif
  35
  36#ifdef __GNUC__
  37#define NORETURN __attribute__((__noreturn__))
  38#else
  39#define NORETURN
  40#ifndef __attribute__
  41#define __attribute__(x)
  42#endif
  43#endif
  44
  45/* General helper functions */
  46extern void usage(const char *err) NORETURN;
  47extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  48extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  49
  50extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  51extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  52extern void set_error_routine(void (*routine)(const char *err, va_list params));
  53
  54#ifdef NO_MMAP
  55
  56#ifndef PROT_READ
  57#define PROT_READ 1
  58#define PROT_WRITE 2
  59#define MAP_PRIVATE 1
  60#define MAP_FAILED ((void*)-1)
  61#endif
  62
  63#define mmap gitfakemmap
  64#define munmap gitfakemunmap
  65extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
  66extern int gitfakemunmap(void *start, size_t length);
  67
  68#else /* NO_MMAP */
  69
  70#include <sys/mman.h>
  71
  72#endif /* NO_MMAP */
  73
  74#ifdef NO_SETENV
  75#define setenv gitsetenv
  76extern int gitsetenv(const char *, const char *, int);
  77#endif
  78
  79#ifdef NO_UNSETENV
  80#define unsetenv gitunsetenv
  81extern void gitunsetenv(const char *);
  82#endif
  83
  84#ifdef NO_STRCASESTR
  85#define strcasestr gitstrcasestr
  86extern char *gitstrcasestr(const char *haystack, const char *needle);
  87#endif
  88
  89#ifdef NO_STRLCPY
  90#define strlcpy gitstrlcpy
  91extern size_t gitstrlcpy(char *, const char *, size_t);
  92#endif
  93
  94static inline char* xstrdup(const char *str)
  95{
  96        char *ret = strdup(str);
  97        if (!ret)
  98                die("Out of memory, strdup failed");
  99        return ret;
 100}
 101
 102static inline void *xmalloc(size_t size)
 103{
 104        void *ret = malloc(size);
 105        if (!ret && !size)
 106                ret = malloc(1);
 107        if (!ret)
 108                die("Out of memory, malloc failed");
 109#ifdef XMALLOC_POISON
 110        memset(ret, 0xA5, size);
 111#endif
 112        return ret;
 113}
 114
 115static inline void *xrealloc(void *ptr, size_t size)
 116{
 117        void *ret = realloc(ptr, size);
 118        if (!ret && !size)
 119                ret = realloc(ptr, 1);
 120        if (!ret)
 121                die("Out of memory, realloc failed");
 122        return ret;
 123}
 124
 125static inline void *xcalloc(size_t nmemb, size_t size)
 126{
 127        void *ret = calloc(nmemb, size);
 128        if (!ret && (!nmemb || !size))
 129                ret = calloc(1, 1);
 130        if (!ret)
 131                die("Out of memory, calloc failed");
 132        return ret;
 133}
 134
 135static inline ssize_t xread(int fd, void *buf, size_t len)
 136{
 137        ssize_t nr;
 138        while (1) {
 139                nr = read(fd, buf, len);
 140                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 141                        continue;
 142                return nr;
 143        }
 144}
 145
 146static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 147{
 148        ssize_t nr;
 149        while (1) {
 150                nr = write(fd, buf, len);
 151                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 152                        continue;
 153                return nr;
 154        }
 155}
 156
 157static inline int has_extension(const char *filename, const char *ext)
 158{
 159        size_t len = strlen(filename);
 160        size_t extlen = strlen(ext);
 161        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 162}
 163
 164/* Sane ctype - no locale, and works with signed chars */
 165#undef isspace
 166#undef isdigit
 167#undef isalpha
 168#undef isalnum
 169#undef tolower
 170#undef toupper
 171extern unsigned char sane_ctype[256];
 172#define GIT_SPACE 0x01
 173#define GIT_DIGIT 0x02
 174#define GIT_ALPHA 0x04
 175#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 176#define isspace(x) sane_istest(x,GIT_SPACE)
 177#define isdigit(x) sane_istest(x,GIT_DIGIT)
 178#define isalpha(x) sane_istest(x,GIT_ALPHA)
 179#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 180#define tolower(x) sane_case((unsigned char)(x), 0x20)
 181#define toupper(x) sane_case((unsigned char)(x), 0)
 182
 183static inline int sane_case(int x, int high)
 184{
 185        if (sane_istest(x, GIT_ALPHA))
 186                x = (x & ~0x20) | high;
 187        return x;
 188}
 189
 190#endif