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#ifdef __GNUC__
  30#define NORETURN __attribute__((__noreturn__))
  31#else
  32#define NORETURN
  33#ifndef __attribute__
  34#define __attribute__(x)
  35#endif
  36#endif
  37
  38/* General helper functions */
  39extern void usage(const char *err) NORETURN;
  40extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  41extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  42
  43#ifdef NO_MMAP
  44
  45#ifndef PROT_READ
  46#define PROT_READ 1
  47#define PROT_WRITE 2
  48#define MAP_PRIVATE 1
  49#define MAP_FAILED ((void*)-1)
  50#endif
  51
  52#define mmap gitfakemmap
  53#define munmap gitfakemunmap
  54extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
  55extern int gitfakemunmap(void *start, size_t length);
  56
  57#else /* NO_MMAP */
  58
  59#include <sys/mman.h>
  60
  61#endif /* NO_MMAP */
  62
  63#ifdef NO_SETENV
  64#define setenv gitsetenv
  65extern int gitsetenv(const char *, const char *, int);
  66#endif
  67
  68#ifdef NO_UNSETENV
  69#define unsetenv gitunsetenv
  70extern void gitunsetenv(const char *);
  71#endif
  72
  73#ifdef NO_STRCASESTR
  74#define strcasestr gitstrcasestr
  75extern char *gitstrcasestr(const char *haystack, const char *needle);
  76#endif
  77
  78static inline void *xmalloc(size_t size)
  79{
  80        void *ret = malloc(size);
  81        if (!ret && !size)
  82                ret = malloc(1);
  83        if (!ret)
  84                die("Out of memory, malloc failed");
  85        return ret;
  86}
  87
  88static inline void *xrealloc(void *ptr, size_t size)
  89{
  90        void *ret = realloc(ptr, size);
  91        if (!ret && !size)
  92                ret = realloc(ptr, 1);
  93        if (!ret)
  94                die("Out of memory, realloc failed");
  95        return ret;
  96}
  97
  98static inline void *xcalloc(size_t nmemb, size_t size)
  99{
 100        void *ret = calloc(nmemb, size);
 101        if (!ret && (!nmemb || !size))
 102                ret = calloc(1, 1);
 103        if (!ret)
 104                die("Out of memory, calloc failed");
 105        return ret;
 106}
 107
 108static inline ssize_t xread(int fd, void *buf, size_t len)
 109{
 110        ssize_t nr;
 111        while (1) {
 112                nr = read(fd, buf, len);
 113                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 114                        continue;
 115                return nr;
 116        }
 117}
 118
 119static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 120{
 121        ssize_t nr;
 122        while (1) {
 123                nr = write(fd, buf, len);
 124                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 125                        continue;
 126                return nr;
 127        }
 128}
 129
 130/* Sane ctype - no locale, and works with signed chars */
 131#undef isspace
 132#undef isdigit
 133#undef isalpha
 134#undef isalnum
 135#undef tolower
 136#undef toupper
 137extern unsigned char sane_ctype[256];
 138#define GIT_SPACE 0x01
 139#define GIT_DIGIT 0x02
 140#define GIT_ALPHA 0x04
 141#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 142#define isspace(x) sane_istest(x,GIT_SPACE)
 143#define isdigit(x) sane_istest(x,GIT_DIGIT)
 144#define isalpha(x) sane_istest(x,GIT_ALPHA)
 145#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 146#define tolower(x) sane_case((unsigned char)(x), 0x20)
 147#define toupper(x) sane_case((unsigned char)(x), 0)
 148
 149static inline int sane_case(int x, int high)
 150{
 151        if (sane_istest(x, GIT_ALPHA))
 152                x = (x & ~0x20) | high;
 153        return x;
 154}
 155
 156#ifndef MAXPATHLEN
 157#define MAXPATHLEN 256
 158#endif
 159#endif