cat-file.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 int main(int argc, char **argv)
   9 {
  10         unsigned char sha1[20];
  11         char type[20];
  12         void *buf;
  13         unsigned long size;
  14
  15         if (argc != 3 || get_sha1(argv[2], sha1))
  16                 usage("git-cat-file [-t | -s | tagname] <sha1>");
  17
  18         if (!strcmp("-t", argv[1]) || !strcmp("-s", argv[1])) {
  19                 if (!sha1_object_info(sha1, type, &size)) {
  20                         switch (argv[1][1]) {
  21                         case 't':
  22                                 printf("%s\n", type);
  23                                 break;
  24                         case 's':
  25                                 printf("%lu\n", size);
  26                                 break;
  27                         }
  28                         return 0;
  29                 }
  30                 buf = NULL;
  31         } else {
  32                 buf = read_object_with_reference(sha1, argv[1], &size, NULL);
  33         }
  34
  35         if (!buf)
  36                 die("git-cat-file %s: bad file", argv[2]);
  37
  38         while (size > 0) {
  39                 long ret = write(1, buf, size);
  40                 if (ret < 0) {
  41                         if (errno == EAGAIN)
  42                                 continue;
  43                         /* Ignore epipe */
  44                         if (errno == EPIPE)
  45                                 break;
  46                         die("git-cat-file: %s", strerror(errno));
  47                 } else if (!ret) {
  48                         die("git-cat-file: disk full?");
  49                 }
  50                 size -= ret;
  51                 buf += ret;
  52         }
  53         return 0;
  54 }