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Commit | Line | Data |
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d9ea73e0 | 1 | #include "cache.h" |
b2141fc1 | 2 | #include "config.h" |
cbd53a21 | 3 | #include "object-store.h" |
d9ea73e0 | 4 | #include "xdiff-interface.h" |
86295bb6 RS |
5 | #include "xdiff/xtypes.h" |
6 | #include "xdiff/xdiffi.h" | |
7 | #include "xdiff/xemit.h" | |
8 | #include "xdiff/xmacros.h" | |
5ec8274b | 9 | #include "xdiff/xutils.h" |
8a3f524b JH |
10 | |
11 | struct xdiff_emit_state { | |
9346d6d1 JK |
12 | xdiff_emit_hunk_fn hunk_fn; |
13 | xdiff_emit_line_fn line_fn; | |
8a3f524b JH |
14 | void *consume_callback_data; |
15 | struct strbuf remainder; | |
16 | }; | |
d9ea73e0 | 17 | |
9346d6d1 JK |
18 | static int xdiff_out_hunk(void *priv_, |
19 | long old_begin, long old_nr, | |
20 | long new_begin, long new_nr, | |
21 | const char *func, long funclen) | |
c1e335a4 | 22 | { |
9346d6d1 | 23 | struct xdiff_emit_state *priv = priv_; |
c1e335a4 | 24 | |
9346d6d1 JK |
25 | if (priv->remainder.len) |
26 | BUG("xdiff emitted hunk in the middle of a line"); | |
c1e335a4 | 27 | |
9346d6d1 JK |
28 | priv->hunk_fn(priv->consume_callback_data, |
29 | old_begin, old_nr, new_begin, new_nr, | |
30 | func, funclen); | |
31 | return 0; | |
c1e335a4 JH |
32 | } |
33 | ||
a8d5eb6d | 34 | static int consume_one(void *priv_, char *s, unsigned long size) |
d9ea73e0 JH |
35 | { |
36 | struct xdiff_emit_state *priv = priv_; | |
37 | char *ep; | |
38 | while (size) { | |
39 | unsigned long this_size; | |
9e204422 | 40 | int ret; |
d9ea73e0 JH |
41 | ep = memchr(s, '\n', size); |
42 | this_size = (ep == NULL) ? size : (ep - s + 1); | |
9e204422 ÆAB |
43 | ret = priv->line_fn(priv->consume_callback_data, s, this_size); |
44 | if (ret) | |
45 | return ret; | |
d9ea73e0 JH |
46 | size -= this_size; |
47 | s += this_size; | |
48 | } | |
a8d5eb6d | 49 | return 0; |
d9ea73e0 JH |
50 | } |
51 | ||
c99db9d2 | 52 | static int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf) |
d9ea73e0 JH |
53 | { |
54 | struct xdiff_emit_state *priv = priv_; | |
55 | int i; | |
9e204422 | 56 | int stop = 0; |
d9ea73e0 | 57 | |
7c61e25f JK |
58 | if (!priv->line_fn) |
59 | return 0; | |
60 | ||
d9ea73e0 | 61 | for (i = 0; i < nbuf; i++) { |
9e204422 ÆAB |
62 | if (stop) |
63 | return 1; | |
d9ea73e0 JH |
64 | if (mb[i].ptr[mb[i].size-1] != '\n') { |
65 | /* Incomplete line */ | |
b4637760 | 66 | strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size); |
d9ea73e0 JH |
67 | continue; |
68 | } | |
69 | ||
70 | /* we have a complete line */ | |
b4637760 | 71 | if (!priv->remainder.len) { |
9e204422 | 72 | stop = consume_one(priv, mb[i].ptr, mb[i].size); |
d9ea73e0 JH |
73 | continue; |
74 | } | |
b4637760 | 75 | strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size); |
9e204422 | 76 | stop = consume_one(priv, priv->remainder.buf, priv->remainder.len); |
b4637760 | 77 | strbuf_reset(&priv->remainder); |
d9ea73e0 | 78 | } |
9e204422 ÆAB |
79 | if (stop) |
80 | return -1; | |
b4637760 | 81 | if (priv->remainder.len) { |
9e204422 | 82 | stop = consume_one(priv, priv->remainder.buf, priv->remainder.len); |
b4637760 | 83 | strbuf_reset(&priv->remainder); |
d9ea73e0 | 84 | } |
9e204422 ÆAB |
85 | if (stop) |
86 | return -1; | |
d9ea73e0 JH |
87 | return 0; |
88 | } | |
7cab5883 | 89 | |
913b45f5 JH |
90 | /* |
91 | * Trim down common substring at the end of the buffers, | |
e0876bca | 92 | * but end on a complete line. |
913b45f5 | 93 | */ |
e0876bca | 94 | static void trim_common_tail(mmfile_t *a, mmfile_t *b) |
913b45f5 JH |
95 | { |
96 | const int blk = 1024; | |
52499977 | 97 | long trimmed = 0, recovered = 0; |
d20bc01a JK |
98 | char *ap = a->size ? a->ptr + a->size : a->ptr; |
99 | char *bp = b->size ? b->ptr + b->size : b->ptr; | |
913b45f5 JH |
100 | long smaller = (a->size < b->size) ? a->size : b->size; |
101 | ||
102 | while (blk + trimmed <= smaller && !memcmp(ap - blk, bp - blk, blk)) { | |
103 | trimmed += blk; | |
104 | ap -= blk; | |
105 | bp -= blk; | |
106 | } | |
107 | ||
d2f82950 | 108 | while (recovered < trimmed) |
52499977 | 109 | if (ap[recovered++] == '\n') |
d2f82950 LT |
110 | break; |
111 | a->size -= trimmed - recovered; | |
112 | b->size -= trimmed - recovered; | |
913b45f5 JH |
113 | } |
114 | ||
c279d7e9 JH |
115 | int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t const *xecfg, xdemitcb_t *xecb) |
116 | { | |
913b45f5 JH |
117 | mmfile_t a = *mf1; |
118 | mmfile_t b = *mf2; | |
119 | ||
dcd1742e JK |
120 | if (mf1->size > MAX_XDIFF_SIZE || mf2->size > MAX_XDIFF_SIZE) |
121 | return -1; | |
122 | ||
e0876bca RS |
123 | if (!xecfg->ctxlen && !(xecfg->flags & XDL_EMIT_FUNCCONTEXT)) |
124 | trim_common_tail(&a, &b); | |
913b45f5 JH |
125 | |
126 | return xdl_diff(&a, &b, xpp, xecfg, xecb); | |
c279d7e9 JH |
127 | } |
128 | ||
c99db9d2 | 129 | int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2, |
9346d6d1 JK |
130 | xdiff_emit_hunk_fn hunk_fn, |
131 | xdiff_emit_line_fn line_fn, | |
132 | void *consume_callback_data, | |
dfea7900 | 133 | xpparam_t const *xpp, xdemitconf_t const *xecfg) |
c99db9d2 BD |
134 | { |
135 | int ret; | |
8a3f524b | 136 | struct xdiff_emit_state state; |
dfea7900 | 137 | xdemitcb_t ecb; |
8a3f524b JH |
138 | |
139 | memset(&state, 0, sizeof(state)); | |
9346d6d1 JK |
140 | state.hunk_fn = hunk_fn; |
141 | state.line_fn = line_fn; | |
8a3f524b | 142 | state.consume_callback_data = consume_callback_data; |
dfea7900 | 143 | memset(&ecb, 0, sizeof(ecb)); |
9346d6d1 JK |
144 | if (hunk_fn) |
145 | ecb.out_hunk = xdiff_out_hunk; | |
611e42a5 | 146 | ecb.out_line = xdiff_outf; |
dfea7900 | 147 | ecb.priv = &state; |
8a3f524b | 148 | strbuf_init(&state.remainder, 0); |
dfea7900 | 149 | ret = xdi_diff(mf1, mf2, xpp, xecfg, &ecb); |
8a3f524b | 150 | strbuf_release(&state.remainder); |
c99db9d2 BD |
151 | return ret; |
152 | } | |
153 | ||
7cab5883 JS |
154 | int read_mmfile(mmfile_t *ptr, const char *filename) |
155 | { | |
156 | struct stat st; | |
157 | FILE *f; | |
dc49cd76 | 158 | size_t sz; |
7cab5883 JS |
159 | |
160 | if (stat(filename, &st)) | |
5118d7f4 | 161 | return error_errno("Could not stat %s", filename); |
7cab5883 | 162 | if ((f = fopen(filename, "rb")) == NULL) |
5118d7f4 | 163 | return error_errno("Could not open %s", filename); |
dc49cd76 | 164 | sz = xsize_t(st.st_size); |
381b851c | 165 | ptr->ptr = xmalloc(sz ? sz : 1); |
5fd89814 RS |
166 | if (sz && fread(ptr->ptr, sz, 1, f) != 1) { |
167 | fclose(f); | |
7cab5883 | 168 | return error("Could not read %s", filename); |
5fd89814 | 169 | } |
7cab5883 | 170 | fclose(f); |
dc49cd76 | 171 | ptr->size = sz; |
7cab5883 JS |
172 | return 0; |
173 | } | |
174 | ||
d449347d | 175 | void read_mmblob(mmfile_t *ptr, const struct object_id *oid) |
06b65939 ML |
176 | { |
177 | unsigned long size; | |
178 | enum object_type type; | |
179 | ||
14228447 | 180 | if (oideq(oid, null_oid())) { |
06b65939 ML |
181 | ptr->ptr = xstrdup(""); |
182 | ptr->size = 0; | |
183 | return; | |
184 | } | |
185 | ||
b4f5aca4 | 186 | ptr->ptr = read_object_file(oid, &type, &size); |
06b65939 | 187 | if (!ptr->ptr || type != OBJ_BLOB) |
d449347d | 188 | die("unable to read blob object %s", oid_to_hex(oid)); |
06b65939 ML |
189 | ptr->size = size; |
190 | } | |
191 | ||
6bfce93e JS |
192 | #define FIRST_FEW_BYTES 8000 |
193 | int buffer_is_binary(const char *ptr, unsigned long size) | |
194 | { | |
195 | if (FIRST_FEW_BYTES < size) | |
196 | size = FIRST_FEW_BYTES; | |
197 | return !!memchr(ptr, 0, size); | |
198 | } | |
f258475a JH |
199 | |
200 | struct ff_regs { | |
201 | int nr; | |
202 | struct ff_reg { | |
203 | regex_t re; | |
204 | int negate; | |
205 | } *array; | |
206 | }; | |
207 | ||
208 | static long ff_regexp(const char *line, long len, | |
209 | char *buffer, long buffer_size, void *priv) | |
210 | { | |
f258475a JH |
211 | struct ff_regs *regs = priv; |
212 | regmatch_t pmatch[2]; | |
3d8dccd7 | 213 | int i; |
b7d36ffc | 214 | int result; |
f258475a | 215 | |
a5a5a048 BC |
216 | /* Exclude terminating newline (and cr) from matching */ |
217 | if (len > 0 && line[len-1] == '\n') { | |
46dc1b0e JH |
218 | if (len > 1 && line[len-2] == '\r') |
219 | len -= 2; | |
220 | else | |
221 | len--; | |
222 | } | |
223 | ||
f258475a JH |
224 | for (i = 0; i < regs->nr; i++) { |
225 | struct ff_reg *reg = regs->array + i; | |
b7d36ffc | 226 | if (!regexec_buf(®->re, line, len, 2, pmatch, 0)) { |
3d8dccd7 | 227 | if (reg->negate) |
b7d36ffc | 228 | return -1; |
3d8dccd7 | 229 | break; |
f258475a JH |
230 | } |
231 | } | |
3d8dccd7 | 232 | if (regs->nr <= i) |
b7d36ffc | 233 | return -1; |
f258475a JH |
234 | i = pmatch[1].rm_so >= 0 ? 1 : 0; |
235 | line += pmatch[i].rm_so; | |
236 | result = pmatch[i].rm_eo - pmatch[i].rm_so; | |
237 | if (result > buffer_size) | |
238 | result = buffer_size; | |
1b6ecbad BC |
239 | while (result > 0 && (isspace(line[result - 1]))) |
240 | result--; | |
f258475a | 241 | memcpy(buffer, line, result); |
f258475a JH |
242 | return result; |
243 | } | |
244 | ||
a013585b | 245 | void xdiff_set_find_func(xdemitconf_t *xecfg, const char *value, int cflags) |
f258475a JH |
246 | { |
247 | int i; | |
248 | struct ff_regs *regs; | |
249 | ||
250 | xecfg->find_func = ff_regexp; | |
251 | regs = xecfg->find_func_priv = xmalloc(sizeof(struct ff_regs)); | |
252 | for (i = 0, regs->nr = 1; value[i]; i++) | |
253 | if (value[i] == '\n') | |
254 | regs->nr++; | |
b32fa95f | 255 | ALLOC_ARRAY(regs->array, regs->nr); |
f258475a JH |
256 | for (i = 0; i < regs->nr; i++) { |
257 | struct ff_reg *reg = regs->array + i; | |
3cd309c1 | 258 | const char *ep, *expression; |
f258475a JH |
259 | char *buffer = NULL; |
260 | ||
3cd309c1 JK |
261 | if (!value) |
262 | BUG("mismatch between line count and parsing"); | |
263 | ep = strchr(value, '\n'); | |
264 | ||
f258475a JH |
265 | reg->negate = (*value == '!'); |
266 | if (reg->negate && i == regs->nr - 1) | |
267 | die("Last expression must not be negated: %s", value); | |
268 | if (*value == '!') | |
269 | value++; | |
270 | if (ep) | |
271 | expression = buffer = xstrndup(value, ep - value); | |
272 | else | |
273 | expression = value; | |
a013585b | 274 | if (regcomp(®->re, expression, cflags)) |
f258475a | 275 | die("Invalid regexp to look for hunk header: %s", expression); |
8e0f7003 | 276 | free(buffer); |
3cd309c1 | 277 | value = ep ? ep + 1 : NULL; |
f258475a JH |
278 | } |
279 | } | |
b5412484 | 280 | |
8cfe5f1c RS |
281 | void xdiff_clear_find_func(xdemitconf_t *xecfg) |
282 | { | |
283 | if (xecfg->find_func) { | |
284 | int i; | |
285 | struct ff_regs *regs = xecfg->find_func_priv; | |
286 | ||
287 | for (i = 0; i < regs->nr; i++) | |
288 | regfree(®s->array[i].re); | |
289 | free(regs->array); | |
290 | free(regs); | |
291 | xecfg->find_func = NULL; | |
292 | xecfg->find_func_priv = NULL; | |
293 | } | |
294 | } | |
295 | ||
5ec8274b SB |
296 | unsigned long xdiff_hash_string(const char *s, size_t len, long flags) |
297 | { | |
298 | return xdl_hash_record(&s, s + len, flags); | |
299 | } | |
300 | ||
301 | int xdiff_compare_lines(const char *l1, long s1, | |
302 | const char *l2, long s2, long flags) | |
303 | { | |
304 | return xdl_recmatch(l1, s1, l2, s2, flags); | |
305 | } | |
306 | ||
b5412484 JH |
307 | int git_xmerge_style = -1; |
308 | ||
309 | int git_xmerge_config(const char *var, const char *value, void *cb) | |
310 | { | |
8c2be75f | 311 | if (!strcmp(var, "merge.conflictstyle")) { |
b5412484 JH |
312 | if (!value) |
313 | die("'%s' is not a boolean", var); | |
314 | if (!strcmp(value, "diff3")) | |
315 | git_xmerge_style = XDL_MERGE_DIFF3; | |
4496526f PW |
316 | else if (!strcmp(value, "zdiff3")) |
317 | git_xmerge_style = XDL_MERGE_ZEALOUS_DIFF3; | |
b5412484 JH |
318 | else if (!strcmp(value, "merge")) |
319 | git_xmerge_style = 0; | |
5a59a230 NTND |
320 | /* |
321 | * Please update _git_checkout() in | |
322 | * git-completion.bash when you add new merge config | |
323 | */ | |
b5412484 JH |
324 | else |
325 | die("unknown style '%s' given for '%s'", | |
326 | value, var); | |
327 | return 0; | |
328 | } | |
329 | return git_default_config(var, value, cb); | |
330 | } |