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