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 #include "tag.h"
   9 #include "tree.h"
  10
  11 static void flush_buffer(const char *buf, unsigned long size)
  12 {
  13         while (size > 0) {
  14                 long ret = xwrite(1, buf, size);
  15                 if (ret < 0) {
  16                         /* Ignore epipe */
  17                         if (errno == EPIPE)
  18                                 break;
  19                         die("git-cat-file: %s", strerror(errno));
  20                 } else if (!ret) {
  21                         die("git-cat-file: disk full?");
  22                 }
  23                 size -= ret;
  24                 buf += ret;
  25         }
  26 }
  27
  28 static int pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
  29 {
  30         /* the parser in tag.c is useless here. */
  31         const char *endp = buf + size;
  32         const char *cp = buf;
  33
  34         while (cp < endp) {
  35                 char c = *cp++;
  36                 if (c != '\n')
  37                         continue;
  38                 if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
  39                         const char *tagger = cp;
  40
  41                         /* Found the tagger line.  Copy out the contents
  42                          * of the buffer so far.
  43                          */
  44                         flush_buffer(buf, cp - buf);
  45
  46                         /*
  47                          * Do something intelligent, like pretty-printing
  48                          * the date.
  49                          */
  50                         while (cp < endp) {
  51                                 if (*cp++ == '\n') {
  52                                         /* tagger to cp is a line
  53                                          * that has ident and time.
  54                                          */
  55                                         const char *sp = tagger;
  56                                         char *ep;
  57                                         unsigned long date;
  58                                         long tz;
  59                                         while (sp < cp && *sp != '>')
  60                                                 sp++;
  61                                         if (sp == cp) {
  62                                                 /* give up */
  63                                                 flush_buffer(tagger,
  64                                                              cp - tagger);
  65                                                 break;
  66                                         }
  67                                         while (sp < cp &&
  68                                                !('0' <= *sp && *sp <= '9'))
  69                                                 sp++;
  70                                         flush_buffer(tagger, sp - tagger);
  71                                         date = strtoul(sp, &ep, 10);
  72                                         tz = strtol(ep, NULL, 10);
  73                                         sp = show_date(date, tz);
  74                                         flush_buffer(sp, strlen(sp));
  75                                         xwrite(1, "\n", 1);
  76                                         break;
  77                                 }
  78                         }
  79                         break;
  80                 }
  81                 if (cp < endp && *cp == '\n')
  82                         /* end of header */
  83                         break;
  84         }
  85         /* At this point, we have copied out the header up to the end of
  86          * the tagger line and cp points at one past \n.  It could be the
  87          * next header line after the tagger line, or it could be another
  88          * \n that marks the end of the headers.  We need to copy out the
  89          * remainder as is.
  90          */
  91         if (cp < endp)
  92                 flush_buffer(cp, endp - cp);
  93         return 0;
  94 }
  95
  96 int main(int argc, char **argv)
  97 {
  98         unsigned char sha1[20];
  99         char type[20];
 100         void *buf;
 101         unsigned long size;
 102         int opt;
 103
 104         setup_git_directory();
 105         git_config(git_default_config);
 106         if (argc != 3 || get_sha1(argv[2], sha1))
 107                 usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
 108
 109         opt = 0;
 110         if ( argv[1][0] == '-' ) {
 111                 opt = argv[1][1];
 112                 if ( !opt || argv[1][2] )
 113                         opt = -1; /* Not a single character option */
 114         }
 115
 116         buf = NULL;
 117         switch (opt) {
 118         case 't':
 119                 if (!sha1_object_info(sha1, type, NULL)) {
 120                         printf("%s\n", type);
 121                         return 0;
 122                 }
 123                 break;
 124
 125         case 's':
 126                 if (!sha1_object_info(sha1, type, &size)) {
 127                         printf("%lu\n", size);
 128                         return 0;
 129                 }
 130                 break;
 131
 132         case 'e':
 133                 return !has_sha1_file(sha1);
 134
 135         case 'p':
 136                 if (get_sha1(argv[2], sha1) ||
 137                     sha1_object_info(sha1, type, NULL))
 138                         die("Not a valid object name %s", argv[2]);
 139
 140                 /* custom pretty-print here */
 141                 if (!strcmp(type, tree_type))
 142                         return execl_git_cmd("ls-tree", argv[2], NULL);
 143
 144                 buf = read_sha1_file(sha1, type, &size);
 145                 if (!buf)
 146                         die("Cannot read object %s", argv[2]);
 147                 if (!strcmp(type, tag_type))
 148                         return pprint_tag(sha1, buf, size);
 149
 150                 /* otherwise just spit out the data */
 151                 break;
 152         case 0:
 153                 buf = read_object_with_reference(sha1, argv[1], &size, NULL);
 154                 break;
 155
 156         default:
 157                 die("git-cat-file: unknown option: %s\n", argv[1]);
 158         }
 159
 160         if (!buf)
 161                 die("git-cat-file %s: bad file", argv[2]);
 162
 163         flush_buffer(buf, size);
 164         return 0;
 165 }