HTTP slot reuse fixes
[git.git] / 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         if (argc != 3 || get_sha1(argv[2], sha1))
104                 usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
105
106         opt = 0;
107         if ( argv[1][0] == '-' ) {
108                 opt = argv[1][1];
109                 if ( !opt || argv[1][2] )
110                         opt = -1; /* Not a single character option */
111         }
112
113         buf = NULL;
114         switch (opt) {
115         case 't':
116                 if (!sha1_object_info(sha1, type, NULL)) {
117                         printf("%s\n", type);
118                         return 0;
119                 }
120                 break;
121
122         case 's':
123                 if (!sha1_object_info(sha1, type, &size)) {
124                         printf("%lu\n", size);
125                         return 0;
126                 }
127                 break;
128
129         case 'e':
130                 return !has_sha1_file(sha1);
131
132         case 'p':
133                 if (get_sha1(argv[2], sha1) ||
134                     sha1_object_info(sha1, type, NULL))
135                         die("Not a valid object name %s", argv[2]);
136
137                 /* custom pretty-print here */
138                 if (!strcmp(type, "tree"))
139                         return execl_git_cmd("ls-tree", argv[2], NULL);
140
141                 buf = read_sha1_file(sha1, type, &size);
142                 if (!buf)
143                         die("Cannot read object %s", argv[2]);
144                 if (!strcmp(type, "tag"))
145                         return pprint_tag(sha1, buf, size);
146
147                 /* otherwise just spit out the data */
148                 break;
149         case 0:
150                 buf = read_object_with_reference(sha1, argv[1], &size, NULL);
151                 break;
152
153         default:
154                 die("git-cat-file: unknown option: %s\n", argv[1]);
155         }
156
157         if (!buf)
158                 die("git-cat-file %s: bad file", argv[2]);
159
160         flush_buffer(buf, size);
161         return 0;
162 }