Andrew's git - gitweb.git/blob

   1#include "../git-compat-util.h"
   2
   3void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset)
   4{
   5        int n = 0;
   6        off_t current_offset = lseek(fd, 0, SEEK_CUR);
   7
   8        if (start != NULL || !(flags & MAP_PRIVATE))
   9                die("Invalid usage of gitfakemmap.");
  10
  11        if (lseek(fd, offset, SEEK_SET) < 0) {
  12                errno = EINVAL;
  13                return MAP_FAILED;
  14        }
  15
  16        start = xmalloc(length);
  17        if (start == NULL) {
  18                errno = ENOMEM;
  19                return MAP_FAILED;
  20        }
  21
  22        while (n < length) {
  23                int count = read(fd, start+n, length-n);
  24
  25                if (count == 0) {
  26                        memset(start+n, 0, length-n);
  27                        break;
  28                }
  29
  30                if (count < 0) {
  31                        free(start);
  32                        errno = EACCES;
  33                        return MAP_FAILED;
  34                }
  35
  36                n += count;
  37        }
  38
  39        if (current_offset != lseek(fd, current_offset, SEEK_SET)) {
  40                errno = EINVAL;
  41                return MAP_FAILED;
  42        }
  43
  44        return start;
  45}
  46
  47int gitfakemunmap(void *start, size_t length)
  48{
  49        free(start);
  50        return 0;
  51}
  52