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3443546f LT |
1 | /* |
2 | * LibXDiff by Davide Libenzi ( File Differential Library ) | |
3 | * Copyright (C) 2003 Davide Libenzi | |
4 | * | |
5 | * This library is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU Lesser General Public | |
7 | * License as published by the Free Software Foundation; either | |
8 | * version 2.1 of the License, or (at your option) any later version. | |
9 | * | |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public | |
16 | * License along with this library; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | * Davide Libenzi <davidel@xmailserver.org> | |
20 | * | |
21 | */ | |
22 | ||
23 | #include "xinclude.h" | |
24 | ||
25 | ||
26 | ||
27 | #define XDL_GUESS_NLINES 256 | |
28 | ||
29 | ||
30 | ||
31 | ||
ca557aff DL |
32 | long xdl_bogosqrt(long n) { |
33 | long i; | |
34 | ||
35 | /* | |
36 | * Classical integer square root approximation using shifts. | |
37 | */ | |
38 | for (i = 1; n > 0; n >>= 2) | |
39 | i <<= 1; | |
40 | ||
41 | return i; | |
42 | } | |
43 | ||
44 | ||
3443546f LT |
45 | int xdl_emit_diffrec(char const *rec, long size, char const *pre, long psize, |
46 | xdemitcb_t *ecb) { | |
d281786f | 47 | int i = 2; |
621c53cc | 48 | mmbuffer_t mb[3]; |
3443546f LT |
49 | |
50 | mb[0].ptr = (char *) pre; | |
51 | mb[0].size = psize; | |
52 | mb[1].ptr = (char *) rec; | |
53 | mb[1].size = size; | |
d281786f JH |
54 | if (size > 0 && rec[size - 1] != '\n') { |
55 | mb[2].ptr = (char *) "\n\\ No newline at end of file\n"; | |
621c53cc | 56 | mb[2].size = strlen(mb[2].ptr); |
d281786f | 57 | i++; |
621c53cc | 58 | } |
621c53cc | 59 | if (ecb->outf(ecb->priv, mb, i) < 0) { |
3443546f LT |
60 | |
61 | return -1; | |
62 | } | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | void *xdl_mmfile_first(mmfile_t *mmf, long *size) | |
68 | { | |
69 | *size = mmf->size; | |
70 | return mmf->ptr; | |
71 | } | |
72 | ||
73 | ||
74 | void *xdl_mmfile_next(mmfile_t *mmf, long *size) | |
75 | { | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | ||
80 | long xdl_mmfile_size(mmfile_t *mmf) | |
81 | { | |
82 | return mmf->size; | |
83 | } | |
84 | ||
85 | ||
86 | int xdl_cha_init(chastore_t *cha, long isize, long icount) { | |
87 | ||
88 | cha->head = cha->tail = NULL; | |
89 | cha->isize = isize; | |
90 | cha->nsize = icount * isize; | |
91 | cha->ancur = cha->sncur = NULL; | |
92 | cha->scurr = 0; | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | ||
98 | void xdl_cha_free(chastore_t *cha) { | |
99 | chanode_t *cur, *tmp; | |
100 | ||
101 | for (cur = cha->head; (tmp = cur) != NULL;) { | |
102 | cur = cur->next; | |
103 | xdl_free(tmp); | |
104 | } | |
105 | } | |
106 | ||
107 | ||
108 | void *xdl_cha_alloc(chastore_t *cha) { | |
109 | chanode_t *ancur; | |
110 | void *data; | |
111 | ||
112 | if (!(ancur = cha->ancur) || ancur->icurr == cha->nsize) { | |
113 | if (!(ancur = (chanode_t *) xdl_malloc(sizeof(chanode_t) + cha->nsize))) { | |
114 | ||
115 | return NULL; | |
116 | } | |
117 | ancur->icurr = 0; | |
118 | ancur->next = NULL; | |
119 | if (cha->tail) | |
120 | cha->tail->next = ancur; | |
121 | if (!cha->head) | |
122 | cha->head = ancur; | |
123 | cha->tail = ancur; | |
124 | cha->ancur = ancur; | |
125 | } | |
126 | ||
127 | data = (char *) ancur + sizeof(chanode_t) + ancur->icurr; | |
128 | ancur->icurr += cha->isize; | |
129 | ||
130 | return data; | |
131 | } | |
132 | ||
133 | ||
134 | void *xdl_cha_first(chastore_t *cha) { | |
135 | chanode_t *sncur; | |
136 | ||
137 | if (!(cha->sncur = sncur = cha->head)) | |
138 | return NULL; | |
139 | ||
140 | cha->scurr = 0; | |
141 | ||
142 | return (char *) sncur + sizeof(chanode_t) + cha->scurr; | |
143 | } | |
144 | ||
145 | ||
146 | void *xdl_cha_next(chastore_t *cha) { | |
147 | chanode_t *sncur; | |
148 | ||
149 | if (!(sncur = cha->sncur)) | |
150 | return NULL; | |
151 | cha->scurr += cha->isize; | |
152 | if (cha->scurr == sncur->icurr) { | |
153 | if (!(sncur = cha->sncur = sncur->next)) | |
154 | return NULL; | |
155 | cha->scurr = 0; | |
156 | } | |
157 | ||
158 | return (char *) sncur + sizeof(chanode_t) + cha->scurr; | |
159 | } | |
160 | ||
161 | ||
162 | long xdl_guess_lines(mmfile_t *mf) { | |
163 | long nl = 0, size, tsize = 0; | |
164 | char const *data, *cur, *top; | |
165 | ||
166 | if ((cur = data = xdl_mmfile_first(mf, &size)) != NULL) { | |
167 | for (top = data + size; nl < XDL_GUESS_NLINES;) { | |
168 | if (cur >= top) { | |
169 | tsize += (long) (cur - data); | |
170 | if (!(cur = data = xdl_mmfile_next(mf, &size))) | |
171 | break; | |
172 | top = data + size; | |
173 | } | |
174 | nl++; | |
175 | if (!(cur = memchr(cur, '\n', top - cur))) | |
176 | cur = top; | |
177 | else | |
178 | cur++; | |
179 | } | |
180 | tsize += (long) (cur - data); | |
181 | } | |
182 | ||
183 | if (nl && tsize) | |
184 | nl = xdl_mmfile_size(mf) / (tsize / nl); | |
185 | ||
186 | return nl + 1; | |
187 | } | |
188 | ||
0d21efa5 JS |
189 | int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags) |
190 | { | |
191 | int i1, i2; | |
192 | ||
3b5ef0e2 JH |
193 | if (!(flags & XDF_WHITESPACE_FLAGS)) |
194 | return s1 == s2 && !memcmp(l1, l2, s1); | |
195 | ||
196 | i1 = 0; | |
197 | i2 = 0; | |
198 | ||
199 | /* | |
200 | * -w matches everything that matches with -b, and -b in turn | |
201 | * matches everything that matches with --ignore-space-at-eol. | |
202 | * | |
203 | * Each flavor of ignoring needs different logic to skip whitespaces | |
204 | * while we have both sides to compare. | |
205 | */ | |
0d21efa5 | 206 | if (flags & XDF_IGNORE_WHITESPACE) { |
3b5ef0e2 JH |
207 | goto skip_ws; |
208 | while (i1 < s1 && i2 < s2) { | |
209 | if (l1[i1++] != l2[i2++]) | |
2344d47f | 210 | return 0; |
3b5ef0e2 JH |
211 | skip_ws: |
212 | while (i1 < s1 && isspace(l1[i1])) | |
213 | i1++; | |
214 | while (i2 < s2 && isspace(l2[i2])) | |
215 | i2++; | |
0d21efa5 | 216 | } |
0d21efa5 | 217 | } else if (flags & XDF_IGNORE_WHITESPACE_CHANGE) { |
3b5ef0e2 JH |
218 | while (i1 < s1 && i2 < s2) { |
219 | if (isspace(l1[i1]) && isspace(l2[i2])) { | |
220 | /* Skip matching spaces and try again */ | |
859f9c45 JS |
221 | while (i1 < s1 && isspace(l1[i1])) |
222 | i1++; | |
223 | while (i2 < s2 && isspace(l2[i2])) | |
224 | i2++; | |
3b5ef0e2 | 225 | continue; |
859f9c45 | 226 | } |
3b5ef0e2 JH |
227 | if (l1[i1++] != l2[i2++]) |
228 | return 0; | |
229 | } | |
230 | } else if (flags & XDF_IGNORE_WHITESPACE_AT_EOL) { | |
231 | while (i1 < s1 && i2 < s2 && l1[i1++] == l2[i2++]) | |
232 | ; /* keep going */ | |
233 | } | |
234 | ||
235 | /* | |
236 | * After running out of one side, the remaining side must have | |
237 | * nothing but whitespace for the lines to match. Note that | |
238 | * ignore-whitespace-at-eol case may break out of the loop | |
239 | * while there still are characters remaining on both lines. | |
240 | */ | |
241 | if (i1 < s1) { | |
242 | while (i1 < s1 && isspace(l1[i1])) | |
859f9c45 | 243 | i1++; |
3b5ef0e2 JH |
244 | if (s1 != i1) |
245 | return 0; | |
246 | } | |
247 | if (i2 < s2) { | |
248 | while (i2 < s2 && isspace(l2[i2])) | |
859f9c45 | 249 | i2++; |
3b5ef0e2 JH |
250 | return (s2 == i2); |
251 | } | |
252 | return 1; | |
0d21efa5 | 253 | } |
3443546f | 254 | |
824f782c JS |
255 | static unsigned long xdl_hash_record_with_whitespace(char const **data, |
256 | char const *top, long flags) { | |
3443546f LT |
257 | unsigned long ha = 5381; |
258 | char const *ptr = *data; | |
259 | ||
260 | for (; ptr < top && *ptr != '\n'; ptr++) { | |
824f782c | 261 | if (isspace(*ptr)) { |
859f9c45 | 262 | const char *ptr2 = ptr; |
78ed710f | 263 | int at_eol; |
2344d47f JS |
264 | while (ptr + 1 < top && isspace(ptr[1]) |
265 | && ptr[1] != '\n') | |
0d21efa5 | 266 | ptr++; |
78ed710f | 267 | at_eol = (top <= ptr + 1 || ptr[1] == '\n'); |
6d12acef KC |
268 | if (flags & XDF_IGNORE_WHITESPACE) |
269 | ; /* already handled */ | |
270 | else if (flags & XDF_IGNORE_WHITESPACE_CHANGE | |
78ed710f | 271 | && !at_eol) { |
0d21efa5 JS |
272 | ha += (ha << 5); |
273 | ha ^= (unsigned long) ' '; | |
274 | } | |
6d12acef | 275 | else if (flags & XDF_IGNORE_WHITESPACE_AT_EOL |
78ed710f | 276 | && !at_eol) { |
859f9c45 JS |
277 | while (ptr2 != ptr + 1) { |
278 | ha += (ha << 5); | |
279 | ha ^= (unsigned long) *ptr2; | |
280 | ptr2++; | |
281 | } | |
282 | } | |
0d21efa5 JS |
283 | continue; |
284 | } | |
3443546f LT |
285 | ha += (ha << 5); |
286 | ha ^= (unsigned long) *ptr; | |
287 | } | |
288 | *data = ptr < top ? ptr + 1: ptr; | |
289 | ||
290 | return ha; | |
291 | } | |
292 | ||
293 | ||
824f782c JS |
294 | unsigned long xdl_hash_record(char const **data, char const *top, long flags) { |
295 | unsigned long ha = 5381; | |
296 | char const *ptr = *data; | |
297 | ||
298 | if (flags & XDF_WHITESPACE_FLAGS) | |
299 | return xdl_hash_record_with_whitespace(data, top, flags); | |
300 | ||
301 | for (; ptr < top && *ptr != '\n'; ptr++) { | |
302 | ha += (ha << 5); | |
303 | ha ^= (unsigned long) *ptr; | |
304 | } | |
305 | *data = ptr < top ? ptr + 1: ptr; | |
306 | ||
307 | return ha; | |
308 | } | |
309 | ||
310 | ||
3443546f LT |
311 | unsigned int xdl_hashbits(unsigned int size) { |
312 | unsigned int val = 1, bits = 0; | |
313 | ||
314 | for (; val < size && bits < CHAR_BIT * sizeof(unsigned int); val <<= 1, bits++); | |
315 | return bits ? bits: 1; | |
316 | } | |
317 | ||
318 | ||
319 | int xdl_num_out(char *out, long val) { | |
320 | char *ptr, *str = out; | |
321 | char buf[32]; | |
322 | ||
323 | ptr = buf + sizeof(buf) - 1; | |
324 | *ptr = '\0'; | |
325 | if (val < 0) { | |
326 | *--ptr = '-'; | |
327 | val = -val; | |
328 | } | |
329 | for (; val && ptr > buf; val /= 10) | |
330 | *--ptr = "0123456789"[val % 10]; | |
331 | if (*ptr) | |
332 | for (; *ptr; ptr++, str++) | |
333 | *str = *ptr; | |
334 | else | |
335 | *str++ = '0'; | |
336 | *str = '\0'; | |
337 | ||
338 | return str - out; | |
339 | } | |
340 | ||
341 | ||
342 | long xdl_atol(char const *str, char const **next) { | |
343 | long val, base; | |
344 | char const *top; | |
345 | ||
346 | for (top = str; XDL_ISDIGIT(*top); top++); | |
347 | if (next) | |
348 | *next = top; | |
349 | for (val = 0, base = 1, top--; top >= str; top--, base *= 10) | |
350 | val += base * (long)(*top - '0'); | |
351 | return val; | |
352 | } | |
353 | ||
354 | ||
acb72577 MW |
355 | int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2, |
356 | const char *func, long funclen, xdemitcb_t *ecb) { | |
3443546f LT |
357 | int nb = 0; |
358 | mmbuffer_t mb; | |
359 | char buf[128]; | |
360 | ||
361 | memcpy(buf, "@@ -", 4); | |
362 | nb += 4; | |
363 | ||
ca557aff | 364 | nb += xdl_num_out(buf + nb, c1 ? s1: s1 - 1); |
3443546f | 365 | |
3ce8f089 JH |
366 | if (c1 != 1) { |
367 | memcpy(buf + nb, ",", 1); | |
368 | nb += 1; | |
3443546f | 369 | |
3ce8f089 JH |
370 | nb += xdl_num_out(buf + nb, c1); |
371 | } | |
3443546f LT |
372 | |
373 | memcpy(buf + nb, " +", 2); | |
374 | nb += 2; | |
375 | ||
ca557aff | 376 | nb += xdl_num_out(buf + nb, c2 ? s2: s2 - 1); |
3443546f | 377 | |
3ce8f089 JH |
378 | if (c2 != 1) { |
379 | memcpy(buf + nb, ",", 1); | |
380 | nb += 1; | |
3443546f | 381 | |
3ce8f089 JH |
382 | nb += xdl_num_out(buf + nb, c2); |
383 | } | |
3443546f | 384 | |
acb72577 MW |
385 | memcpy(buf + nb, " @@", 3); |
386 | nb += 3; | |
387 | if (func && funclen) { | |
388 | buf[nb++] = ' '; | |
389 | if (funclen > sizeof(buf) - nb - 1) | |
390 | funclen = sizeof(buf) - nb - 1; | |
391 | memcpy(buf + nb, func, funclen); | |
392 | nb += funclen; | |
393 | } | |
394 | buf[nb++] = '\n'; | |
3443546f LT |
395 | |
396 | mb.ptr = buf; | |
397 | mb.size = nb; | |
398 | if (ecb->outf(ecb->priv, &mb, 1) < 0) | |
399 | return -1; | |
400 | ||
401 | return 0; | |
402 | } |