40bc187bdc201c6d5b7df0eb7144d98760b72bdd
1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "cache.h"
8 static char *diff_cmd = "diff -L '%s' -u -N - '%s'";
10 /* Help to copy the thing properly quoted for the shell safety.
11 * any single quote is replaced with '\'', and the caller is
12 * expected to enclose the result within a single quote pair.
13 *
14 * E.g.
15 * original sq_expand result
16 * name ==> name ==> 'name'
17 * a b ==> a b ==> 'a b'
18 * a'b ==> a'\''b ==> 'a'\''b'
19 *
20 * NOTE! The returned memory belongs to this function so
21 * do not free it.
22 */
23 static char *sq_expand(char *src)
24 {
25 static char *buf = NULL;
26 int cnt, c;
27 char *cp;
29 /* count bytes needed to store the quoted string. */
30 for (cnt = 1, cp = src; *cp; cnt++, cp++)
31 if (*cp == '\'')
32 cnt += 3;
34 if (! (buf = malloc(cnt)))
35 return buf;
36 cp = buf;
37 while ((c = *src++)) {
38 if (c != '\'')
39 *cp++ = c;
40 else {
41 cp = strcpy(cp, "'\\''");
42 cp += 4;
43 }
44 }
45 *cp = 0;
46 return buf;
47 }
49 static void show_differences(char *name, char *label, void *old_contents,
50 unsigned long long old_size)
51 {
52 FILE *f;
53 char *name_sq = sq_expand(name);
54 char *label_sq = (name != label) ? sq_expand(label) : name_sq;
55 int cmd_size = strlen(name_sq) + strlen(label_sq) + strlen(diff_cmd);
56 char *cmd = malloc(cmd_size);
58 fflush(stdout);
59 snprintf(cmd, cmd_size, diff_cmd, label_sq, name_sq);
60 f = popen(cmd, "w");
61 if (old_size)
62 fwrite(old_contents, old_size, 1, f);
63 pclose(f);
64 if (label_sq != name_sq)
65 free(label_sq);
66 free(name_sq);
67 free(cmd);
68 }
70 static void show_diff_empty(struct cache_entry *ce)
71 {
72 char *old;
73 unsigned long int size;
74 unsigned char type[20];
76 old = read_sha1_file(ce->sha1, type, &size);
77 if (! old) {
78 error("unable to read blob object for %s (%s)", ce->name,
79 sha1_to_hex(ce->sha1));
80 return;
81 }
82 show_differences("/dev/null", ce->name, old, size);
83 }
85 static const char *show_diff_usage = "show-diff [-q] [-s] [-z] [paths...]";
87 static int matches_pathspec(struct cache_entry *ce, char **spec, int cnt)
88 {
89 int i;
90 int namelen = ce_namelen(ce);
91 for (i = 0; i < cnt; i++) {
92 int speclen = strlen(spec[i]);
93 if (! strncmp(spec[i], ce->name, speclen) &&
94 speclen <= namelen &&
95 (ce->name[speclen] == 0 ||
96 ce->name[speclen] == '/'))
97 return 1;
98 }
99 return 0;
100 }
102 int main(int argc, char **argv)
103 {
104 int silent = 0;
105 int silent_on_nonexisting_files = 0;
106 int machine_readable = 0;
107 int entries = read_cache();
108 int i;
110 while (1 < argc && argv[1][0] == '-') {
111 if (!strcmp(argv[1], "-s"))
112 silent_on_nonexisting_files = silent = 1;
113 else if (!strcmp(argv[1], "-q"))
114 silent_on_nonexisting_files = 1;
115 else if (!strcmp(argv[1], "-z"))
116 machine_readable = 1;
117 else
118 usage(show_diff_usage);
119 argv++; argc--;
120 }
122 /* At this point, if argc == 1, then we are doing everything.
123 * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
124 */
125 if (entries < 0) {
126 perror("read_cache");
127 exit(1);
128 }
129 for (i = 0; i < entries; i++) {
130 struct stat st;
131 struct cache_entry *ce = active_cache[i];
132 int changed;
133 unsigned long size;
134 char type[20];
135 void *old;
137 if (1 < argc &&
138 ! matches_pathspec(ce, argv+1, argc-1))
139 continue;
141 if (ce_stage(ce)) {
142 if (machine_readable)
143 printf("U %s%c", ce->name, 0);
144 else
145 printf("%s: Unmerged\n",
146 ce->name);
147 while (i < entries &&
148 !strcmp(ce->name, active_cache[i]->name))
149 i++;
150 i--; /* compensate for loop control increments */
151 continue;
152 }
154 if (stat(ce->name, &st) < 0) {
155 if (errno == ENOENT && silent_on_nonexisting_files)
156 continue;
157 if (machine_readable)
158 printf("X %s%c", ce->name, 0);
159 else {
160 printf("%s: %s\n", ce->name, strerror(errno));
161 if (errno == ENOENT)
162 show_diff_empty(ce);
163 }
164 continue;
165 }
166 changed = cache_match_stat(ce, &st);
167 if (!changed)
168 continue;
169 if (!machine_readable)
170 printf("%s: %s\n", ce->name, sha1_to_hex(ce->sha1));
171 else {
172 printf("%s %s%c", sha1_to_hex(ce->sha1), ce->name, 0);
173 continue;
174 }
175 if (silent)
176 continue;
178 old = read_sha1_file(ce->sha1, type, &size);
179 if (! old)
180 error("unable to read blob object for %s (%s)",
181 ce->name, sha1_to_hex(ce->sha1));
182 else
183 show_differences(ce->name, ce->name, old, size);
184 free(old);
185 }
186 return 0;
187 }