1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 * Copyright (C) 2010 Google Inc.
4 */
5 #include "cache.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "xdiff-interface.h"
9 #include "kwset.h"
10 #include "commit.h"
11 #include "quote.h"
12
13 typedef int (*pickaxe_fn)(mmfile_t *one, mmfile_t *two,
14 struct diff_options *o,
15 regex_t *regexp, kwset_t kws);
16
17 struct diffgrep_cb {
18 regex_t *regexp;
19 int hit;
20 };
21
diffgrep_consume(void * priv,char * line,unsigned long len)22 static int diffgrep_consume(void *priv, char *line, unsigned long len)
23 {
24 struct diffgrep_cb *data = priv;
25 regmatch_t regmatch;
26
27 if (line[0] != '+' && line[0] != '-')
28 return 0;
29 if (data->hit)
30 BUG("Already matched in diffgrep_consume! Broken xdiff_emit_line_fn?");
31 if (!regexec_buf(data->regexp, line + 1, len - 1, 1,
32 ®match, 0)) {
33 data->hit = 1;
34 return 1;
35 }
36 return 0;
37 }
38
diff_grep(mmfile_t * one,mmfile_t * two,struct diff_options * o,regex_t * regexp,kwset_t kws)39 static int diff_grep(mmfile_t *one, mmfile_t *two,
40 struct diff_options *o,
41 regex_t *regexp, kwset_t kws)
42 {
43 struct diffgrep_cb ecbdata;
44 xpparam_t xpp;
45 xdemitconf_t xecfg;
46 int ret;
47
48 /*
49 * We have both sides; need to run textual diff and see if
50 * the pattern appears on added/deleted lines.
51 */
52 memset(&xpp, 0, sizeof(xpp));
53 memset(&xecfg, 0, sizeof(xecfg));
54 ecbdata.regexp = regexp;
55 ecbdata.hit = 0;
56 xecfg.flags = XDL_EMIT_NO_HUNK_HDR;
57 xecfg.ctxlen = o->context;
58 xecfg.interhunkctxlen = o->interhunkcontext;
59
60 /*
61 * An xdiff error might be our "data->hit" from above. See the
62 * comment for xdiff_emit_line_fn in xdiff-interface.h
63 */
64 ret = xdi_diff_outf(one, two, NULL, diffgrep_consume,
65 &ecbdata, &xpp, &xecfg);
66 if (ecbdata.hit)
67 return 1;
68 if (ret)
69 return ret;
70 return 0;
71 }
72
contains(mmfile_t * mf,regex_t * regexp,kwset_t kws,unsigned int limit)73 static unsigned int contains(mmfile_t *mf, regex_t *regexp, kwset_t kws,
74 unsigned int limit)
75 {
76 unsigned int cnt = 0;
77 unsigned long sz = mf->size;
78 const char *data = mf->ptr;
79
80 if (regexp) {
81 regmatch_t regmatch;
82 int flags = 0;
83
84 while (sz &&
85 !regexec_buf(regexp, data, sz, 1, ®match, flags)) {
86 flags |= REG_NOTBOL;
87 data += regmatch.rm_eo;
88 sz -= regmatch.rm_eo;
89 if (sz && regmatch.rm_so == regmatch.rm_eo) {
90 data++;
91 sz--;
92 }
93 cnt++;
94
95 if (limit && cnt == limit)
96 return cnt;
97 }
98
99 } else { /* Classic exact string match */
100 while (sz) {
101 struct kwsmatch kwsm;
102 size_t offset = kwsexec(kws, data, sz, &kwsm);
103 if (offset == -1)
104 break;
105 sz -= offset + kwsm.size[0];
106 data += offset + kwsm.size[0];
107 cnt++;
108
109 if (limit && cnt == limit)
110 return cnt;
111 }
112 }
113 return cnt;
114 }
115
has_changes(mmfile_t * one,mmfile_t * two,struct diff_options * o,regex_t * regexp,kwset_t kws)116 static int has_changes(mmfile_t *one, mmfile_t *two,
117 struct diff_options *o,
118 regex_t *regexp, kwset_t kws)
119 {
120 unsigned int c1 = one ? contains(one, regexp, kws, 0) : 0;
121 unsigned int c2 = two ? contains(two, regexp, kws, c1 + 1) : 0;
122 return c1 != c2;
123 }
124
pickaxe_match(struct diff_filepair * p,struct diff_options * o,regex_t * regexp,kwset_t kws,pickaxe_fn fn)125 static int pickaxe_match(struct diff_filepair *p, struct diff_options *o,
126 regex_t *regexp, kwset_t kws, pickaxe_fn fn)
127 {
128 struct userdiff_driver *textconv_one = NULL;
129 struct userdiff_driver *textconv_two = NULL;
130 mmfile_t mf1, mf2;
131 int ret;
132
133 /* ignore unmerged */
134 if (!DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two))
135 return 0;
136
137 if (o->objfind) {
138 return (DIFF_FILE_VALID(p->one) &&
139 oidset_contains(o->objfind, &p->one->oid)) ||
140 (DIFF_FILE_VALID(p->two) &&
141 oidset_contains(o->objfind, &p->two->oid));
142 }
143
144 if (o->flags.allow_textconv) {
145 textconv_one = get_textconv(o->repo, p->one);
146 textconv_two = get_textconv(o->repo, p->two);
147 }
148
149 /*
150 * If we have an unmodified pair, we know that the count will be the
151 * same and don't even have to load the blobs. Unless textconv is in
152 * play, _and_ we are using two different textconv filters (e.g.,
153 * because a pair is an exact rename with different textconv attributes
154 * for each side, which might generate different content).
155 */
156 if (textconv_one == textconv_two && diff_unmodified_pair(p))
157 return 0;
158
159 if ((o->pickaxe_opts & DIFF_PICKAXE_KIND_G) &&
160 !o->flags.text &&
161 ((!textconv_one && diff_filespec_is_binary(o->repo, p->one)) ||
162 (!textconv_two && diff_filespec_is_binary(o->repo, p->two))))
163 return 0;
164
165 mf1.size = fill_textconv(o->repo, textconv_one, p->one, &mf1.ptr);
166 mf2.size = fill_textconv(o->repo, textconv_two, p->two, &mf2.ptr);
167
168 ret = fn(&mf1, &mf2, o, regexp, kws);
169
170 if (textconv_one)
171 free(mf1.ptr);
172 if (textconv_two)
173 free(mf2.ptr);
174 diff_free_filespec_data(p->one);
175 diff_free_filespec_data(p->two);
176
177 return ret;
178 }
179
pickaxe(struct diff_queue_struct * q,struct diff_options * o,regex_t * regexp,kwset_t kws,pickaxe_fn fn)180 static void pickaxe(struct diff_queue_struct *q, struct diff_options *o,
181 regex_t *regexp, kwset_t kws, pickaxe_fn fn)
182 {
183 int i;
184 struct diff_queue_struct outq;
185
186 DIFF_QUEUE_CLEAR(&outq);
187
188 if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
189 /* Showing the whole changeset if needle exists */
190 for (i = 0; i < q->nr; i++) {
191 struct diff_filepair *p = q->queue[i];
192 if (pickaxe_match(p, o, regexp, kws, fn))
193 return; /* do not munge the queue */
194 }
195
196 /*
197 * Otherwise we will clear the whole queue by copying
198 * the empty outq at the end of this function, but
199 * first clear the current entries in the queue.
200 */
201 for (i = 0; i < q->nr; i++)
202 diff_free_filepair(q->queue[i]);
203 } else {
204 /* Showing only the filepairs that has the needle */
205 for (i = 0; i < q->nr; i++) {
206 struct diff_filepair *p = q->queue[i];
207 if (pickaxe_match(p, o, regexp, kws, fn))
208 diff_q(&outq, p);
209 else
210 diff_free_filepair(p);
211 }
212 }
213
214 free(q->queue);
215 *q = outq;
216 }
217
regcomp_or_die(regex_t * regex,const char * needle,int cflags)218 static void regcomp_or_die(regex_t *regex, const char *needle, int cflags)
219 {
220 int err = regcomp(regex, needle, cflags);
221 if (err) {
222 /* The POSIX.2 people are surely sick */
223 char errbuf[1024];
224 regerror(err, regex, errbuf, 1024);
225 die("invalid regex: %s", errbuf);
226 }
227 }
228
diffcore_pickaxe(struct diff_options * o)229 void diffcore_pickaxe(struct diff_options *o)
230 {
231 const char *needle = o->pickaxe;
232 int opts = o->pickaxe_opts;
233 regex_t regex, *regexp = NULL;
234 kwset_t kws = NULL;
235 pickaxe_fn fn;
236
237 if (opts & ~DIFF_PICKAXE_KIND_OBJFIND &&
238 (!needle || !*needle))
239 BUG("should have needle under -G or -S");
240 if (opts & (DIFF_PICKAXE_REGEX | DIFF_PICKAXE_KIND_G)) {
241 int cflags = REG_EXTENDED | REG_NEWLINE;
242 if (o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE)
243 cflags |= REG_ICASE;
244 regcomp_or_die(®ex, needle, cflags);
245 regexp = ®ex;
246
247 if (opts & DIFF_PICKAXE_KIND_G)
248 fn = diff_grep;
249 else if (opts & DIFF_PICKAXE_REGEX)
250 fn = has_changes;
251 else
252 /*
253 * We don't need to check the combination of
254 * -G and --pickaxe-regex, by the time we get
255 * here diff.c has already died if they're
256 * combined. See the usage tests in
257 * t4209-log-pickaxe.sh.
258 */
259 BUG("unreachable");
260 } else if (opts & DIFF_PICKAXE_KIND_S) {
261 if (o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE &&
262 has_non_ascii(needle)) {
263 struct strbuf sb = STRBUF_INIT;
264 int cflags = REG_NEWLINE | REG_ICASE;
265
266 basic_regex_quote_buf(&sb, needle);
267 regcomp_or_die(®ex, sb.buf, cflags);
268 strbuf_release(&sb);
269 regexp = ®ex;
270 } else {
271 kws = kwsalloc(o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE
272 ? tolower_trans_tbl : NULL);
273 kwsincr(kws, needle, strlen(needle));
274 kwsprep(kws);
275 }
276 fn = has_changes;
277 } else if (opts & DIFF_PICKAXE_KIND_OBJFIND) {
278 fn = NULL;
279 } else {
280 BUG("unknown pickaxe_opts flag");
281 }
282
283 pickaxe(&diff_queued_diff, o, regexp, kws, fn);
284
285 if (regexp)
286 regfree(regexp);
287 if (kws)
288 kwsfree(kws);
289 return;
290 }
291