Merge branch 'maint'
[git] / copy.c
1 #include "cache.h"
2
3 int copy_fd(int ifd, int ofd)
4 {
5         while (1) {
6                 char buffer[8192];
7                 char *buf = buffer;
8                 ssize_t len = xread(ifd, buffer, sizeof(buffer));
9                 if (!len)
10                         break;
11                 if (len < 0) {
12                         int read_error;
13                         read_error = errno;
14                         close(ifd);
15                         return error("copy-fd: read returned %s",
16                                      strerror(read_error));
17                 }
18                 while (len) {
19                         int written = xwrite(ofd, buf, len);
20                         if (written > 0) {
21                                 buf += written;
22                                 len -= written;
23                         }
24                         else if (!written) {
25                                 close(ifd);
26                                 return error("copy-fd: write returned 0");
27                         } else {
28                                 close(ifd);
29                                 return error("copy-fd: write returned %s",
30                                              strerror(errno));
31                         }
32                 }
33         }
34         close(ifd);
35         return 0;
36 }