Fix a bunch of pointer declarations (codestyle)
[git/git.git] / diff-no-index.c
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1/*
2 * "diff --no-index" support
3 * Copyright (c) 2007 by Johannes Schindelin
4 * Copyright (c) 2008 by Junio C Hamano
5 */
6
7#include "cache.h"
8#include "color.h"
9#include "commit.h"
10#include "blob.h"
11#include "tag.h"
12#include "diff.h"
13#include "diffcore.h"
14#include "revision.h"
15#include "log-tree.h"
16#include "builtin.h"
c455c87c 17#include "string-list.h"
0569e9b8 18
c455c87c 19static int read_directory(const char *path, struct string_list *list)
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20{
21 DIR *dir;
22 struct dirent *e;
23
24 if (!(dir = opendir(path)))
25 return error("Could not open directory %s", path);
26
27 while ((e = readdir(dir)))
28 if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
c455c87c 29 string_list_insert(e->d_name, list);
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30
31 closedir(dir);
32 return 0;
33}
34
35static int get_mode(const char *path, int *mode)
36{
37 struct stat st;
38
39 if (!path || !strcmp(path, "/dev/null"))
40 *mode = 0;
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41#ifdef _WIN32
42 else if (!strcasecmp(path, "nul"))
43 *mode = 0;
44#endif
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45 else if (!strcmp(path, "-"))
46 *mode = create_ce_mode(0666);
418566b6 47 else if (lstat(path, &st))
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48 return error("Could not access '%s'", path);
49 else
50 *mode = st.st_mode;
51 return 0;
52}
53
54static int queue_diff(struct diff_options *o,
55 const char *name1, const char *name2)
56{
57 int mode1 = 0, mode2 = 0;
58
59 if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
60 return -1;
61
62 if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
63 return error("file/directory conflict: %s, %s", name1, name2);
64
65 if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
66 char buffer1[PATH_MAX], buffer2[PATH_MAX];
c455c87c 67 struct string_list p1 = {NULL, 0, 0, 1}, p2 = {NULL, 0, 0, 1};
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68 int len1 = 0, len2 = 0, i1, i2, ret = 0;
69
70 if (name1 && read_directory(name1, &p1))
71 return -1;
72 if (name2 && read_directory(name2, &p2)) {
c455c87c 73 string_list_clear(&p1, 0);
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74 return -1;
75 }
76
77 if (name1) {
78 len1 = strlen(name1);
79 if (len1 > 0 && name1[len1 - 1] == '/')
80 len1--;
81 memcpy(buffer1, name1, len1);
82 buffer1[len1++] = '/';
83 }
84
85 if (name2) {
86 len2 = strlen(name2);
87 if (len2 > 0 && name2[len2 - 1] == '/')
88 len2--;
89 memcpy(buffer2, name2, len2);
90 buffer2[len2++] = '/';
91 }
92
93 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
94 const char *n1, *n2;
95 int comp;
96
97 if (i1 == p1.nr)
98 comp = 1;
99 else if (i2 == p2.nr)
100 comp = -1;
101 else
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102 comp = strcmp(p1.items[i1].string,
103 p2.items[i2].string);
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104
105 if (comp > 0)
106 n1 = NULL;
107 else {
108 n1 = buffer1;
c455c87c 109 strncpy(buffer1 + len1, p1.items[i1++].string,
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110 PATH_MAX - len1);
111 }
112
113 if (comp < 0)
114 n2 = NULL;
115 else {
116 n2 = buffer2;
c455c87c 117 strncpy(buffer2 + len2, p2.items[i2++].string,
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118 PATH_MAX - len2);
119 }
120
121 ret = queue_diff(o, n1, n2);
122 }
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123 string_list_clear(&p1, 0);
124 string_list_clear(&p2, 0);
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125
126 return ret;
127 } else {
128 struct diff_filespec *d1, *d2;
129
130 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
131 unsigned tmp;
132 const char *tmp_c;
133 tmp = mode1; mode1 = mode2; mode2 = tmp;
134 tmp_c = name1; name1 = name2; name2 = tmp_c;
135 }
136
137 if (!name1)
138 name1 = "/dev/null";
139 if (!name2)
140 name2 = "/dev/null";
141 d1 = alloc_filespec(name1);
142 d2 = alloc_filespec(name2);
143 fill_filespec(d1, null_sha1, mode1);
144 fill_filespec(d2, null_sha1, mode2);
145
146 diff_queue(&diff_queued_diff, d1, d2);
147 return 0;
148 }
149}
150
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151static int path_outside_repo(const char *path)
152{
153 /*
154 * We have already done setup_git_directory_gently() so we
155 * know we are inside a git work tree already.
156 */
157 const char *work_tree;
158 size_t len;
159
160 if (!is_absolute_path(path))
161 return 0;
162 work_tree = get_git_work_tree();
163 len = strlen(work_tree);
164 if (strncmp(path, work_tree, len) ||
165 (path[len] != '\0' && path[len] != '/'))
166 return 1;
167 return 0;
168}
169
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170void diff_no_index(struct rev_info *revs,
171 int argc, const char **argv,
172 int nongit, const char *prefix)
173{
174 int i;
175 int no_index = 0;
176 unsigned options = 0;
177
178 /* Were we asked to do --no-index explicitly? */
179 for (i = 1; i < argc; i++) {
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180 if (!strcmp(argv[i], "--")) {
181 i++;
182 break;
183 }
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184 if (!strcmp(argv[i], "--no-index"))
185 no_index = 1;
186 if (argv[i][0] != '-')
187 break;
188 }
189
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190 if (!no_index && !nongit) {
191 /*
192 * Inside a git repository, without --no-index. Only
193 * when a path outside the repository is given,
194 * e.g. "git diff /var/tmp/[12]", or "git diff
195 * Makefile /var/tmp/Makefile", allow it to be used as
196 * a colourful "diff" replacement.
197 */
198 if ((argc != i + 2) ||
199 (!path_outside_repo(argv[i]) &&
200 !path_outside_repo(argv[i+1])))
201 return;
202 }
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203 if (argc != i + 2)
204 die("git diff %s takes two paths",
205 no_index ? "--no-index" : "[--no-index]");
206
207 diff_setup(&revs->diffopt);
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208 for (i = 1; i < argc - 2; ) {
209 int j;
210 if (!strcmp(argv[i], "--no-index"))
211 i++;
a324fc45 212 else if (!strcmp(argv[i], "-q")) {
0569e9b8 213 options |= DIFF_SILENT_ON_REMOVED;
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214 i++;
215 }
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216 else if (!strcmp(argv[i], "--"))
217 i++;
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218 else {
219 j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
220 if (!j)
221 die("invalid diff option/value: %s", argv[i]);
222 i += j;
223 }
224 }
225
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226 /*
227 * If the user asked for our exit code then don't start a
228 * pager or we would end up reporting its exit code instead.
229 */
230 if (!DIFF_OPT_TST(&revs->diffopt, EXIT_WITH_STATUS))
231 setup_pager();
232
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233 if (prefix) {
234 int len = strlen(prefix);
235
4b25d091 236 revs->diffopt.paths = xcalloc(2, sizeof(char *));
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237 for (i = 0; i < 2; i++) {
238 const char *p = argv[argc - 2 + i];
239 /*
240 * stdin should be spelled as '-'; if you have
241 * path that is '-', spell it as ./-.
242 */
243 p = (strcmp(p, "-")
244 ? xstrdup(prefix_filename(prefix, len, p))
245 : p);
246 revs->diffopt.paths[i] = p;
247 }
248 }
249 else
250 revs->diffopt.paths = argv + argc - 2;
251 revs->diffopt.nr_paths = 2;
d61027b2 252 revs->diffopt.skip_stat_unmatch = 1;
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253 if (!revs->diffopt.output_format)
254 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
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255
256 DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
257 DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
258
259 revs->max_count = -2;
260 if (diff_setup_done(&revs->diffopt) < 0)
261 die("diff_setup_done failed");
262
263 if (queue_diff(&revs->diffopt, revs->diffopt.paths[0],
264 revs->diffopt.paths[1]))
265 exit(1);
a5a818ee 266 diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
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267 diffcore_std(&revs->diffopt);
268 diff_flush(&revs->diffopt);
269
270 /*
271 * The return code for --no-index imitates diff(1):
272 * 0 = no changes, 1 = changes, else error
273 */
274 exit(revs->diffopt.found_changes);
275}