compat/pread.c

   1 #include "../git-compat-util.h"
   2
   3 int read_in_full(int fd, void *buf, size_t count);
   4
   5 ssize_t git_pread(int fd, void *buf, size_t count, off_t offset)
   6 {
   7         off_t current_offset;
   8         ssize_t rc;
   9
  10         current_offset = lseek(fd, 0, SEEK_CUR);
  11
  12         if (lseek(fd, offset, SEEK_SET) < 0)
  13                 return -1;
  14
  15         rc = read_in_full(fd, buf, count);
  16
  17         if (current_offset != lseek(fd, current_offset, SEEK_SET))
  18                 return -1;
  19         return rc;
  20 }