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         int fd;
  15
  16         if (argc != 3 || get_sha1_hex(argv[2], sha1))
  17                 usage("cat-file: cat-file [-t | tagname] <sha1>");
  18         buf = read_sha1_file(sha1, type, &size);
  19         if (!buf) {
  20                 fprintf(stderr, "cat-file %s: bad file\n", argv[2]);
  21                 exit(1);
  22         }
  23         if (!strcmp("-t", argv[1])) {
  24                 buf = type;
  25                 size = strlen(type);
  26                 type[size] = '\n';
  27                 size++;
  28         } else if (strcmp(type, argv[1])) {
  29                 fprintf(stderr, "cat-file %s: bad tag\n", argv[2]);
  30                 exit(1);        /* bad tag */
  31         }
  32
  33         while (size > 0) {
  34                 long ret = write(1, buf, size);
  35                 if (ret < 0) {
  36                         if (errno == EAGAIN)
  37                                 continue;
  38                         /* Ignore epipe */
  39                         if (errno == EPIPE)
  40                                 break;
  41                         fprintf(stderr, "cat-file: %s\n", strerror(errno));
  42                         exit(1);
  43                 }
  44                 if (!ret) {
  45                         fprintf(stderr, "cat-file: disk full?");
  46                         exit(1);
  47                 }
  48                 size -= ret;
  49                 buf += ret;
  50         }
  51         return 0;
  52 }