cat-file.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "exec_cmd.h"
   8
   9 static void flush_buffer(const char *buf, unsigned long size)
  10 {
  11         while (size > 0) {
  12                 long ret = xwrite(1, buf, size);
  13                 if (ret < 0) {
  14                         /* Ignore epipe */
  15                         if (errno == EPIPE)
  16                                 break;
  17                         die("git-cat-file: %s", strerror(errno));
  18                 } else if (!ret) {
  19                         die("git-cat-file: disk full?");
  20                 }
  21                 size -= ret;
  22                 buf += ret;
  23         }
  24 }
  25
  26 static int pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
  27 {
  28         /* the parser in tag.c is useless here. */
  29         const char *endp = buf + size;
  30         const char *cp = buf;
  31
  32         while (cp < endp) {
  33                 char c = *cp++;
  34                 if (c != '\n')
  35                         continue;
  36                 if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
  37                         const char *tagger = cp;
  38
  39                         /* Found the tagger line.  Copy out the contents
  40                          * of the buffer so far.
  41                          */
  42                         flush_buffer(buf, cp - buf);
  43
  44                         /*
  45                          * Do something intelligent, like pretty-printing
  46                          * the date.
  47                          */
  48                         while (cp < endp) {
  49                                 if (*cp++ == '\n') {
  50                                         /* tagger to cp is a line
  51                                          * that has ident and time.
  52                                          */
  53                                         const char *sp = tagger;
  54                                         char *ep;
  55                                         unsigned long date;
  56                                         long tz;
  57                                         while (sp < cp && *sp != '>')
  58                                                 sp++;
  59                                         if (sp == cp) {
  60                                                 /* give up */
  61                                                 flush_buffer(tagger,
  62                                                              cp - tagger);
  63                                                 break;
  64                                         }
  65                                         while (sp < cp &&
  66                                                !('0' <= *sp && *sp <= '9'))
  67                                                 sp++;
  68                                         flush_buffer(tagger, sp - tagger);
  69                                         date = strtoul(sp, &ep, 10);
  70                                         tz = strtol(ep, NULL, 10);
  71                                         sp = show_date(date, tz);
  72                                         flush_buffer(sp, strlen(sp));
  73                                         xwrite(1, "\n", 1);
  74                                         break;
  75                                 }
  76                         }
  77                         break;
  78                 }
  79                 if (cp < endp && *cp == '\n')
  80                         /* end of header */
  81                         break;
  82         }
  83         /* At this point, we have copied out the header up to the end of
  84          * the tagger line and cp points at one past \n.  It could be the
  85          * next header line after the tagger line, or it could be another
  86          * \n that marks the end of the headers.  We need to copy out the
  87          * remainder as is.
  88          */
  89         if (cp < endp)
  90                 flush_buffer(cp, endp - cp);
  91         return 0;
  92 }
  93
  94 int main(int argc, char **argv)
  95 {
  96         unsigned char sha1[20];
  97         char type[20];
  98         void *buf;
  99         unsigned long size;
 100         int opt;
 101
 102         setup_git_directory();
 103         git_config(git_default_config);
 104         if (argc != 3 || get_sha1(argv[2], sha1))
 105                 usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
 106
 107         opt = 0;
 108         if ( argv[1][0] == '-' ) {
 109                 opt = argv[1][1];
 110                 if ( !opt || argv[1][2] )
 111                         opt = -1; /* Not a single character option */
 112         }
 113
 114         buf = NULL;
 115         switch (opt) {
 116         case 't':
 117                 if (!sha1_object_info(sha1, type, NULL)) {
 118                         printf("%s\n", type);
 119                         return 0;
 120                 }
 121                 break;
 122
 123         case 's':
 124                 if (!sha1_object_info(sha1, type, &size)) {
 125                         printf("%lu\n", size);
 126                         return 0;
 127                 }
 128                 break;
 129
 130         case 'e':
 131                 return !has_sha1_file(sha1);
 132
 133         case 'p':
 134                 if (get_sha1(argv[2], sha1) ||
 135                     sha1_object_info(sha1, type, NULL))
 136                         die("Not a valid object name %s", argv[2]);
 137
 138                 /* custom pretty-print here */
 139                 if (!strcmp(type, "tree"))
 140                         return execl_git_cmd("ls-tree", argv[2], NULL);
 141
 142                 buf = read_sha1_file(sha1, type, &size);
 143                 if (!buf)
 144                         die("Cannot read object %s", argv[2]);
 145                 if (!strcmp(type, "tag"))
 146                         return pprint_tag(sha1, buf, size);
 147
 148                 /* otherwise just spit out the data */
 149                 break;
 150         case 0:
 151                 buf = read_object_with_reference(sha1, argv[1], &size, NULL);
 152                 break;
 153
 154         default:
 155                 die("git-cat-file: unknown option: %s\n", argv[1]);
 156         }
 157
 158         if (!buf)
 159                 die("git-cat-file %s: bad file", argv[2]);
 160
 161         flush_buffer(buf, size);
 162         return 0;
 163 }