Axe the last ent
[git/git.git] / builtin-cat-file.c
CommitLineData
8bc9a0c7
LT
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
e83c5163 6#include "cache.h"
a0f15fa5 7#include "exec_cmd.h"
8e440259
PE
8#include "tag.h"
9#include "tree.h"
f81daefe 10#include "builtin.h"
a0f15fa5
JH
11
12static void flush_buffer(const char *buf, unsigned long size)
13{
14 while (size > 0) {
15 long ret = xwrite(1, buf, size);
16 if (ret < 0) {
17 /* Ignore epipe */
18 if (errno == EPIPE)
19 break;
20 die("git-cat-file: %s", strerror(errno));
21 } else if (!ret) {
22 die("git-cat-file: disk full?");
23 }
24 size -= ret;
25 buf += ret;
26 }
27}
28
eddd1c8c 29static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
a0f15fa5
JH
30{
31 /* the parser in tag.c is useless here. */
32 const char *endp = buf + size;
33 const char *cp = buf;
34
35 while (cp < endp) {
36 char c = *cp++;
37 if (c != '\n')
38 continue;
39 if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
40 const char *tagger = cp;
41
42 /* Found the tagger line. Copy out the contents
43 * of the buffer so far.
44 */
45 flush_buffer(buf, cp - buf);
46
47 /*
48 * Do something intelligent, like pretty-printing
49 * the date.
50 */
51 while (cp < endp) {
52 if (*cp++ == '\n') {
53 /* tagger to cp is a line
54 * that has ident and time.
55 */
56 const char *sp = tagger;
57 char *ep;
58 unsigned long date;
59 long tz;
60 while (sp < cp && *sp != '>')
61 sp++;
62 if (sp == cp) {
63 /* give up */
64 flush_buffer(tagger,
65 cp - tagger);
66 break;
67 }
68 while (sp < cp &&
69 !('0' <= *sp && *sp <= '9'))
70 sp++;
71 flush_buffer(tagger, sp - tagger);
72 date = strtoul(sp, &ep, 10);
73 tz = strtol(ep, NULL, 10);
74 sp = show_date(date, tz);
75 flush_buffer(sp, strlen(sp));
76 xwrite(1, "\n", 1);
77 break;
78 }
79 }
80 break;
81 }
82 if (cp < endp && *cp == '\n')
83 /* end of header */
84 break;
85 }
86 /* At this point, we have copied out the header up to the end of
87 * the tagger line and cp points at one past \n. It could be the
88 * next header line after the tagger line, or it could be another
89 * \n that marks the end of the headers. We need to copy out the
90 * remainder as is.
91 */
92 if (cp < endp)
93 flush_buffer(cp, endp - cp);
a0f15fa5 94}
e83c5163 95
a633fca0 96int cmd_cat_file(int argc, const char **argv, const char *prefix)
e83c5163
LT
97{
98 unsigned char sha1[20];
99 char type[20];
100 void *buf;
101 unsigned long size;
7950571a 102 int opt;
e83c5163 103
84a9b58c 104 git_config(git_default_config);
31fff305 105 if (argc != 3)
a0f15fa5 106 usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
31fff305
DL
107 if (get_sha1(argv[2], sha1))
108 die("Not a valid object name %s", argv[2]);
7950571a
PA
109
110 opt = 0;
111 if ( argv[1][0] == '-' ) {
112 opt = argv[1][1];
113 if ( !opt || argv[1][2] )
114 opt = -1; /* Not a single character option */
115 }
116
117 buf = NULL;
118 switch (opt) {
119 case 't':
120 if (!sha1_object_info(sha1, type, NULL)) {
121 printf("%s\n", type);
f2a06330 122 return 0;
11e7d5c5 123 }
7950571a
PA
124 break;
125
126 case 's':
127 if (!sha1_object_info(sha1, type, &size)) {
128 printf("%lu\n", size);
129 return 0;
130 }
131 break;
132
133 case 'e':
134 return !has_sha1_file(sha1);
135
a0f15fa5 136 case 'p':
31fff305 137 if (sha1_object_info(sha1, type, NULL))
a0f15fa5
JH
138 die("Not a valid object name %s", argv[2]);
139
140 /* custom pretty-print here */
8e440259 141 if (!strcmp(type, tree_type))
b931aa5a 142 return cmd_ls_tree(2, argv + 1, NULL);
a0f15fa5
JH
143
144 buf = read_sha1_file(sha1, type, &size);
145 if (!buf)
146 die("Cannot read object %s", argv[2]);
eddd1c8c
DR
147 if (!strcmp(type, tag_type)) {
148 pprint_tag(sha1, buf, size);
149 return 0;
150 }
a0f15fa5
JH
151
152 /* otherwise just spit out the data */
153 break;
7950571a 154 case 0:
11e7d5c5 155 buf = read_object_with_reference(sha1, argv[1], &size, NULL);
7950571a
PA
156 break;
157
158 default:
159 die("git-cat-file: unknown option: %s\n", argv[1]);
bf0c6e83
LT
160 }
161
11e7d5c5 162 if (!buf)
bab5583a 163 die("git-cat-file %s: bad file", argv[2]);
11e7d5c5 164
a0f15fa5 165 flush_buffer(buf, size);
bf0c6e83 166 return 0;
e83c5163 167}