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_hex(argv[2], sha1))
  16                 usage("cat-file: cat-file [-t | tagname] <sha1>");
  17         buf = read_sha1_file(sha1, type, &size);
  18         if (!buf) {
  19                 fprintf(stderr, "cat-file %s: bad file\n", argv[2]);
  20                 exit(1);
  21         }
  22         if (!strcmp("-t", argv[1])) {
  23                 buf = type;
  24                 size = strlen(type);
  25                 type[size] = '\n';
  26                 size++;
  27         } else if (strcmp(type, argv[1])) {
  28                 fprintf(stderr, "cat-file %s: bad tag\n", argv[2]);
  29                 exit(1);        /* bad tag */
  30         }
  31
  32         while (size > 0) {
  33                 long ret = write(1, buf, size);
  34                 if (ret < 0) {
  35                         if (errno == EAGAIN)
  36                                 continue;
  37                         /* Ignore epipe */
  38                         if (errno == EPIPE)
  39                                 break;
  40                         fprintf(stderr, "cat-file: %s\n", strerror(errno));
  41                         exit(1);
  42                 }
  43                 if (!ret) {
  44                         fprintf(stderr, "cat-file: disk full?");
  45                         exit(1);
  46                 }
  47                 size -= ret;
  48                 buf += ret;
  49         }
  50         return 0;
  51 }