Annotation of src/usr.bin/cvs/diff_internals.c, Revision 1.28
1.28 ! ray 1: /* $OpenBSD: diff_internals.c,v 1.27 2009/06/06 14:17:27 ray Exp $ */
1.1 joris 2: /*
3: * Copyright (C) Caldera International Inc. 2001-2002.
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code and documentation must retain the above
10: * copyright notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: * 3. All advertising materials mentioning features or use of this software
15: * must display the following acknowledgement:
16: * This product includes software developed or owned by Caldera
17: * International, Inc.
18: * 4. Neither the name of Caldera International, Inc. nor the names of other
19: * contributors may be used to endorse or promote products derived from
20: * this software without specific prior written permission.
21: *
22: * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
23: * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26: * IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE FOR ANY DIRECT,
27: * INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
32: * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33: * POSSIBILITY OF SUCH DAMAGE.
34: */
35: /*-
36: * Copyright (c) 1991, 1993
37: * The Regents of the University of California. All rights reserved.
38: * Copyright (c) 2004 Jean-Francois Brousseau. All rights reserved.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: * 3. Neither the name of the University nor the names of its contributors
49: * may be used to endorse or promote products derived from this software
50: * without specific prior written permission.
51: *
52: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62: * SUCH DAMAGE.
63: *
64: * @(#)diffreg.c 8.1 (Berkeley) 6/6/93
65: */
1.14 ray 66:
67: #include <sys/param.h>
68: #include <sys/stat.h>
69:
70: #include <ctype.h>
71: #include <errno.h>
72: #include <regex.h>
73: #include <stddef.h>
1.16 tobias 74: #include <stdio.h>
1.14 ray 75: #include <string.h>
1.24 tobias 76: #include <time.h>
1.14 ray 77: #include <unistd.h>
78:
79: #include "cvs.h"
80: #include "diff.h"
81:
82: /*
83: * diff - compare two files.
84: */
85:
1.1 joris 86: /*
87: * Uses an algorithm due to Harold Stone, which finds
88: * a pair of longest identical subsequences in the two
89: * files.
90: *
91: * The major goal is to generate the match vector J.
92: * J[i] is the index of the line in file1 corresponding
93: * to line i file0. J[i] = 0 if there is no
94: * such line in file1.
95: *
96: * Lines are hashed so as to work in core. All potential
97: * matches are located by sorting the lines of each file
98: * on the hash (called ``value''). In particular, this
99: * collects the equivalence classes in file1 together.
100: * Subroutine equiv replaces the value of each line in
101: * file0 by the index of the first element of its
102: * matching equivalence in (the reordered) file1.
103: * To save space equiv squeezes file1 into a single
104: * array member in which the equivalence classes
105: * are simply concatenated, except that their first
106: * members are flagged by changing sign.
107: *
108: * Next the indices that point into member are unsorted into
109: * array class according to the original order of file0.
110: *
111: * The cleverness lies in routine stone. This marches
112: * through the lines of file0, developing a vector klist
113: * of "k-candidates". At step i a k-candidate is a matched
114: * pair of lines x,y (x in file0 y in file1) such that
115: * there is a common subsequence of length k
116: * between the first i lines of file0 and the first y
117: * lines of file1, but there is no such subsequence for
118: * any smaller y. x is the earliest possible mate to y
119: * that occurs in such a subsequence.
120: *
121: * Whenever any of the members of the equivalence class of
122: * lines in file1 matable to a line in file0 has serial number
123: * less than the y of some k-candidate, that k-candidate
124: * with the smallest such y is replaced. The new
125: * k-candidate is chained (via pred) to the current
126: * k-1 candidate so that the actual subsequence can
127: * be recovered. When a member has serial number greater
128: * that the y of all k-candidates, the klist is extended.
129: * At the end, the longest subsequence is pulled out
130: * and placed in the array J by unravel
131: *
132: * With J in hand, the matches there recorded are
133: * check'ed against reality to assure that no spurious
134: * matches have crept in due to hashing. If they have,
135: * they are broken, and "jackpot" is recorded--a harmless
136: * matter except that a true match for a spuriously
137: * mated line may now be unnecessarily reported as a change.
138: *
139: * Much of the complexity of the program comes simply
140: * from trying to minimize core utilization and
141: * maximize the range of doable problems by dynamically
142: * allocating what is needed and reusing what is not.
143: * The core requirements for problems larger than somewhat
144: * are (in words) 2*length(file0) + length(file1) +
145: * 3*(number of k-candidates installed), typically about
146: * 6n words for files of length n.
147: */
148:
149: struct cand {
150: int x;
151: int y;
152: int pred;
1.13 ray 153: };
1.1 joris 154:
155: struct line {
156: int serial;
157: int value;
158: } *file[2];
159:
160: /*
1.7 ray 161: * The following struct is used to record change information when
1.1 joris 162: * doing a "context" or "unified" diff. (see routine "change" to
163: * understand the highly mnemonic field names)
164: */
165: struct context_vec {
1.6 ray 166: int a; /* start line in old file */
167: int b; /* end line in old file */
168: int c; /* start line in new file */
169: int d; /* end line in new file */
1.1 joris 170: };
171:
1.27 ray 172: static void output(FILE *, FILE *, int);
173: static void check(FILE *, FILE *, int);
1.1 joris 174: static void range(int, int, char *);
175: static void uni_range(int, int);
1.27 ray 176: static void dump_context_vec(FILE *, FILE *, int);
177: static void dump_unified_vec(FILE *, FILE *, int);
178: static void prepare(int, FILE *, off_t, int);
1.1 joris 179: static void prune(void);
180: static void equiv(struct line *, int, struct line *, int, int *);
181: static void unravel(int);
182: static void unsort(struct line *, int, int *);
1.17 tobias 183: static void diff_head(void);
184: static void rdiff_head(void);
1.27 ray 185: static void change(FILE *, FILE *, int, int, int, int, int);
1.1 joris 186: static void sort(struct line *, int);
187: static int ignoreline(char *);
188: static int asciifile(FILE *);
1.27 ray 189: static void fetch(long *, int, int, FILE *, int, int, int);
1.1 joris 190: static int newcand(int, int, int);
191: static int search(int *, int, int);
192: static int skipline(FILE *);
193: static int isqrt(int);
1.27 ray 194: static int stone(int *, int, int *, int *, int);
195: static int readhash(FILE *, int);
1.1 joris 196: static int files_differ(FILE *, FILE *);
197: static char *match_function(const long *, int, FILE *);
198: static char *preadline(int, size_t, off_t);
199:
1.27 ray 200: static int Tflag;
1.1 joris 201: static int context = 3;
202: int diff_format = D_NORMAL;
1.22 tobias 203: const char *diff_file1 = NULL;
204: const char *diff_file2 = NULL;
1.1 joris 205: RCSNUM *diff_rev1 = NULL;
206: RCSNUM *diff_rev2 = NULL;
207: char diffargs[128];
208: static struct stat stb1, stb2;
209: static char *ifdefname, *ignore_pats;
210: regex_t ignore_re;
211:
212: static int *J; /* will be overlaid on class */
213: static int *class; /* will be overlaid on file[0] */
214: static int *klist; /* will be overlaid on file[0] after class */
215: static int *member; /* will be overlaid on file[1] */
216: static int clen;
217: static int inifdef; /* whether or not we are in a #ifdef block */
1.14 ray 218: static int len[2];
1.1 joris 219: static int pref, suff; /* length of prefix and suffix */
220: static int slen[2];
221: static int anychange;
222: static long *ixnew; /* will be overlaid on file[1] */
223: static long *ixold; /* will be overlaid on klist */
224: static struct cand *clist; /* merely a free storage pot for candidates */
225: static int clistlen; /* the length of clist */
226: static struct line *sfile[2]; /* shortened by pruning common prefix/suffix */
227: static u_char *chrtran; /* translation table for case-folding */
228: static struct context_vec *context_vec_start;
229: static struct context_vec *context_vec_end;
230: static struct context_vec *context_vec_ptr;
231:
1.5 xsa 232: #define FUNCTION_CONTEXT_SIZE 55
1.1 joris 233: static char lastbuf[FUNCTION_CONTEXT_SIZE];
1.8 ray 234: static int lastline;
235: static int lastmatchline;
1.1 joris 236: BUF *diffbuf = NULL;
237:
1.14 ray 238:
1.1 joris 239: /*
240: * chrtran points to one of 2 translation tables: cup2low if folding upper to
241: * lower case clow2low if not folding case
242: */
243: u_char clow2low[256] = {
244: 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
245: 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
246: 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
247: 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
248: 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
249: 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41,
250: 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
251: 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
252: 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62,
253: 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d,
254: 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
255: 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83,
256: 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e,
257: 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
258: 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
259: 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
260: 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba,
261: 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5,
262: 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0,
263: 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb,
264: 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6,
265: 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1,
266: 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc,
267: 0xfd, 0xfe, 0xff
268: };
269:
270: u_char cup2low[256] = {
271: 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
272: 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
273: 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
274: 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
275: 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
276: 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x60, 0x61,
277: 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
278: 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
279: 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x60, 0x61, 0x62,
280: 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d,
281: 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
282: 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83,
283: 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e,
284: 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
285: 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
286: 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
287: 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba,
288: 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5,
289: 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0,
290: 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb,
291: 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6,
292: 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1,
293: 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc,
294: 0xfd, 0xfe, 0xff
295: };
296:
297: int
1.28 ! ray 298: diffreg(const char *file1, const char *file2, int _fd1, int _fd2,
1.27 ray 299: BUF *out, int flags)
1.1 joris 300: {
301: FILE *f1, *f2;
1.19 joris 302: int i, rval, fd1, fd2;
1.1 joris 303:
1.22 tobias 304: diff_file1 = file1;
305: diff_file2 = file2;
1.1 joris 306: f1 = f2 = NULL;
307: rval = D_SAME;
308: anychange = 0;
309: lastline = 0;
310: lastmatchline = 0;
311: context_vec_ptr = context_vec_start - 1;
1.27 ray 312: if (flags & D_IGNORECASE)
313: chrtran = cup2low;
314: else
315: chrtran = clow2low;
1.1 joris 316: if (out != NULL)
317: diffbuf = out;
318:
1.19 joris 319: fd1 = dup(_fd1);
320: if (fd1 == -1)
1.28 ! ray 321: fatal("diffreg: dup: %s", strerror(errno));
1.19 joris 322:
323: fd2 = dup(_fd2);
324: if (fd2 == -1)
1.28 ! ray 325: fatal("diffreg: dup: %s", strerror(errno));
1.19 joris 326:
1.20 joris 327: if (lseek(fd1, 0, SEEK_SET) < 0)
1.28 ! ray 328: fatal("diffreg: lseek: %s", strerror(errno));
1.19 joris 329:
330: f1 = fdopen(fd1, "r");
1.1 joris 331: if (f1 == NULL) {
332: cvs_log(LP_ERR, "%s", file1);
333: goto closem;
334: }
335:
1.20 joris 336: if (lseek(fd2, 0, SEEK_SET) < 0)
1.28 ! ray 337: fatal("diffreg: lseek: %s", strerror(errno));
1.19 joris 338:
339: f2 = fdopen(fd2, "r");
1.1 joris 340: if (f2 == NULL) {
341: cvs_log(LP_ERR, "%s", file2);
342: goto closem;
343: }
344:
1.19 joris 345: if (fstat(fd1, &stb1) < 0) {
1.1 joris 346: cvs_log(LP_ERR, "%s", file1);
347: goto closem;
348: }
1.19 joris 349:
350: if (fstat(fd2, &stb2) < 0) {
1.1 joris 351: cvs_log(LP_ERR, "%s", file2);
352: goto closem;
353: }
1.14 ray 354:
1.1 joris 355: switch (files_differ(f1, f2)) {
356: case 0:
357: goto closem;
358: case 1:
359: break;
360: default:
361: /* error */
362: goto closem;
363: }
364:
1.27 ray 365: if ((flags & D_FORCEASCII) == 0 &&
366: (!asciifile(f1) || !asciifile(f2))) {
1.1 joris 367: rval = D_BINARY;
368: goto closem;
369: }
1.14 ray 370:
1.27 ray 371: prepare(0, f1, stb1.st_size, flags);
372: prepare(1, f2, stb2.st_size, flags);
1.14 ray 373:
1.1 joris 374: prune();
375: sort(sfile[0], slen[0]);
376: sort(sfile[1], slen[1]);
377:
378: member = (int *)file[1];
379: equiv(sfile[0], slen[0], sfile[1], slen[1], member);
1.9 ray 380: member = xrealloc(member, slen[1] + 2, sizeof(*member));
1.1 joris 381:
382: class = (int *)file[0];
383: unsort(sfile[0], slen[0], class);
1.9 ray 384: class = xrealloc(class, slen[0] + 2, sizeof(*class));
1.1 joris 385:
386: klist = xcalloc(slen[0] + 2, sizeof(*klist));
387: clen = 0;
388: clistlen = 100;
389: clist = xcalloc(clistlen, sizeof(*clist));
1.27 ray 390: i = stone(class, slen[0], member, klist, flags);
1.1 joris 391: xfree(member);
392: xfree(class);
393:
1.14 ray 394: J = xrealloc(J, len[0] + 2, sizeof(*J));
1.1 joris 395: unravel(klist[i]);
396: xfree(clist);
397: xfree(klist);
398:
1.14 ray 399: ixold = xrealloc(ixold, len[0] + 2, sizeof(*ixold));
400: ixnew = xrealloc(ixnew, len[1] + 2, sizeof(*ixnew));
1.27 ray 401: check(f1, f2, flags);
402: output(f1, f2, flags);
1.1 joris 403:
404: closem:
1.14 ray 405: if (anychange) {
1.1 joris 406: if (rval == D_SAME)
407: rval = D_DIFFER;
408: }
409: if (f1 != NULL)
410: fclose(f1);
411: if (f2 != NULL)
412: fclose(f2);
413:
414: return (rval);
415: }
416:
417: /*
418: * Check to see if the given files differ.
419: * Returns 0 if they are the same, 1 if different, and -1 on error.
420: * XXX - could use code from cmp(1) [faster]
421: */
422: static int
423: files_differ(FILE *f1, FILE *f2)
424: {
425: char buf1[BUFSIZ], buf2[BUFSIZ];
426: size_t i, j;
427:
428: if (stb1.st_size != stb2.st_size)
429: return (1);
430: for (;;) {
1.11 ray 431: i = fread(buf1, 1, sizeof(buf1), f1);
432: j = fread(buf2, 1, sizeof(buf2), f2);
1.1 joris 433: if (i != j)
434: return (1);
435: if (i == 0 && j == 0) {
436: if (ferror(f1) || ferror(f2))
437: return (1);
438: return (0);
439: }
440: if (memcmp(buf1, buf2, i) != 0)
441: return (1);
442: }
443: }
444:
1.14 ray 445: static void
1.27 ray 446: prepare(int i, FILE *fd, off_t filesize, int flags)
1.1 joris 447: {
448: struct line *p;
449: int j, h;
450: size_t sz;
451:
452: rewind(fd);
453:
1.11 ray 454: sz = (filesize <= SIZE_MAX ? filesize : SIZE_MAX) / 25;
1.1 joris 455: if (sz < 100)
456: sz = 100;
457:
458: p = xcalloc(sz + 3, sizeof(*p));
1.27 ray 459: for (j = 0; (h = readhash(fd, flags));) {
1.14 ray 460: if (j == sz) {
1.1 joris 461: sz = sz * 3 / 2;
1.9 ray 462: p = xrealloc(p, sz + 3, sizeof(*p));
1.1 joris 463: }
464: p[++j].value = h;
465: }
1.14 ray 466: len[i] = j;
1.1 joris 467: file[i] = p;
468: }
469:
470: static void
471: prune(void)
472: {
473: int i, j;
474:
1.14 ray 475: for (pref = 0; pref < len[0] && pref < len[1] &&
1.1 joris 476: file[0][pref + 1].value == file[1][pref + 1].value;
477: pref++)
478: ;
1.14 ray 479: for (suff = 0; suff < len[0] - pref && suff < len[1] - pref &&
480: file[0][len[0] - suff].value == file[1][len[1] - suff].value;
1.1 joris 481: suff++)
482: ;
483: for (j = 0; j < 2; j++) {
484: sfile[j] = file[j] + pref;
1.14 ray 485: slen[j] = len[j] - pref - suff;
1.1 joris 486: for (i = 0; i <= slen[j]; i++)
487: sfile[j][i].serial = i;
488: }
489: }
490:
491: static void
492: equiv(struct line *a, int n, struct line *b, int m, int *c)
493: {
494: int i, j;
495:
496: i = j = 1;
497: while (i <= n && j <= m) {
498: if (a[i].value < b[j].value)
499: a[i++].value = 0;
500: else if (a[i].value == b[j].value)
501: a[i++].value = j;
502: else
503: j++;
504: }
505: while (i <= n)
506: a[i++].value = 0;
507: b[m + 1].value = 0;
508: j = 0;
509: while (++j <= m) {
510: c[j] = -b[j].serial;
511: while (b[j + 1].value == b[j].value) {
512: j++;
513: c[j] = b[j].serial;
514: }
515: }
516: c[j] = -1;
517: }
518:
519: /* Code taken from ping.c */
520: static int
521: isqrt(int n)
522: {
523: int y, x = 1;
524:
525: if (n == 0)
526: return (0);
527:
528: do { /* newton was a stinker */
529: y = x;
530: x = n / x;
531: x += y;
532: x /= 2;
1.14 ray 533: } while ((x - y) > 1 || (x - y) < -1);
1.1 joris 534:
535: return (x);
536: }
537:
538: static int
1.27 ray 539: stone(int *a, int n, int *b, int *c, int flags)
1.1 joris 540: {
541: int i, k, y, j, l;
542: int oldc, tc, oldl;
543: u_int numtries;
544:
545: /* XXX move the isqrt() out of the macro to avoid multiple calls */
1.27 ray 546: const u_int bound = (flags & D_MINIMAL) ? UINT_MAX :
1.28 ! ray 547: MAX(256, isqrt(n));
1.1 joris 548:
549: k = 0;
1.14 ray 550: c[0] = newcand(0, 0, 0);
1.1 joris 551: for (i = 1; i <= n; i++) {
552: j = a[i];
553: if (j == 0)
554: continue;
555: y = -b[j];
556: oldl = 0;
557: oldc = c[0];
558: numtries = 0;
559: do {
560: if (y <= clist[oldc].y)
561: continue;
562: l = search(c, k, y);
563: if (l != oldl + 1)
564: oldc = c[l - 1];
565: if (l <= k) {
566: if (clist[c[l]].y <= y)
567: continue;
568: tc = c[l];
1.14 ray 569: c[l] = newcand(i, y, oldc);
1.1 joris 570: oldc = tc;
571: oldl = l;
572: numtries++;
573: } else {
1.14 ray 574: c[l] = newcand(i, y, oldc);
1.1 joris 575: k++;
576: break;
577: }
578: } while ((y = b[++j]) > 0 && numtries < bound);
579: }
580: return (k);
581: }
582:
583: static int
584: newcand(int x, int y, int pred)
585: {
1.9 ray 586: struct cand *q;
1.1 joris 587:
588: if (clen == clistlen) {
1.10 ray 589: clistlen = clistlen * 11 / 10;
590: clist = xrealloc(clist, clistlen, sizeof(*clist));
1.1 joris 591: }
592: q = clist + clen;
593: q->x = x;
594: q->y = y;
595: q->pred = pred;
596: return (clen++);
597: }
598:
599: static int
600: search(int *c, int k, int y)
601: {
602: int i, j, l, t;
603:
604: if (clist[c[k]].y < y) /* quick look for typical case */
605: return (k + 1);
606: i = 0;
607: j = k + 1;
608: for (;;) {
609: l = (i + j) / 2;
610: if (l <= i)
611: break;
612: t = clist[c[l]].y;
613: if (t > y)
614: j = l;
615: else if (t < y)
616: i = l;
617: else
618: return (l);
619: }
620: return (l + 1);
621: }
622:
623: static void
624: unravel(int p)
625: {
626: struct cand *q;
627: int i;
628:
1.14 ray 629: for (i = 0; i <= len[0]; i++)
1.1 joris 630: J[i] = i <= pref ? i :
1.14 ray 631: i > len[0] - suff ? i + len[1] - len[0] : 0;
1.1 joris 632: for (q = clist + p; q->y != 0; q = clist + q->pred)
633: J[q->x + pref] = q->y + pref;
634: }
635:
636: /*
637: * Check does double duty:
638: * 1. ferret out any fortuitous correspondences due
639: * to confounding by hashing (which result in "jackpot")
640: * 2. collect random access indexes to the two files
641: */
642: static void
1.27 ray 643: check(FILE *f1, FILE *f2, int flags)
1.1 joris 644: {
645: int i, j, jackpot, c, d;
646: long ctold, ctnew;
647:
648: rewind(f1);
649: rewind(f2);
650: j = 1;
651: ixold[0] = ixnew[0] = 0;
652: jackpot = 0;
653: ctold = ctnew = 0;
1.14 ray 654: for (i = 1; i <= len[0]; i++) {
1.1 joris 655: if (J[i] == 0) {
656: ixold[i] = ctold += skipline(f1);
657: continue;
658: }
659: while (j < J[i]) {
660: ixnew[j] = ctnew += skipline(f2);
661: j++;
662: }
1.27 ray 663: if (flags & (D_FOLDBLANKS|D_IGNOREBLANKS|D_IGNORECASE)) {
1.1 joris 664: for (;;) {
665: c = getc(f1);
666: d = getc(f2);
667: /*
668: * GNU diff ignores a missing newline
1.14 ray 669: * in one file for -b or -w.
1.1 joris 670: */
1.27 ray 671: if ((flags & (D_FOLDBLANKS|D_IGNOREBLANKS)) &&
1.1 joris 672: ((c == EOF && d == '\n') ||
673: (c == '\n' && d == EOF))) {
674: break;
675: }
676: ctold++;
677: ctnew++;
1.27 ray 678: if ((flags & D_FOLDBLANKS) && isspace(c) &&
679: isspace(d)) {
1.1 joris 680: do {
681: if (c == '\n')
682: break;
683: ctold++;
684: } while (isspace(c = getc(f1)));
685: do {
686: if (d == '\n')
687: break;
688: ctnew++;
689: } while (isspace(d = getc(f2)));
1.27 ray 690: } else if ((flags & D_IGNOREBLANKS)) {
1.1 joris 691: while (isspace(c) && c != '\n') {
692: c = getc(f1);
693: ctold++;
694: }
695: while (isspace(d) && d != '\n') {
696: d = getc(f2);
697: ctnew++;
698: }
699: }
700: if (chrtran[c] != chrtran[d]) {
701: jackpot++;
702: J[i] = 0;
703: if (c != '\n' && c != EOF)
704: ctold += skipline(f1);
705: if (d != '\n' && c != EOF)
706: ctnew += skipline(f2);
707: break;
708: }
709: if (c == '\n' || c == EOF)
710: break;
711: }
712: } else {
713: for (;;) {
714: ctold++;
715: ctnew++;
716: if ((c = getc(f1)) != (d = getc(f2))) {
717: /* jackpot++; */
718: J[i] = 0;
719: if (c != '\n' && c != EOF)
720: ctold += skipline(f1);
721: if (d != '\n' && c != EOF)
722: ctnew += skipline(f2);
723: break;
724: }
725: if (c == '\n' || c == EOF)
726: break;
727: }
728: }
729: ixold[i] = ctold;
730: ixnew[j] = ctnew;
731: j++;
732: }
1.14 ray 733: for (; j <= len[1]; j++)
1.1 joris 734: ixnew[j] = ctnew += skipline(f2);
735: /*
1.14 ray 736: * if (jackpot)
737: * fprintf(stderr, "jackpot\n");
1.1 joris 738: */
739: }
740:
741: /* shellsort CACM #201 */
742: static void
743: sort(struct line *a, int n)
744: {
745: struct line *ai, *aim, w;
746: int j, m = 0, k;
747:
748: if (n == 0)
749: return;
750: for (j = 1; j <= n; j *= 2)
751: m = 2 * j - 1;
752: for (m /= 2; m != 0; m /= 2) {
753: k = n - m;
754: for (j = 1; j <= k; j++) {
755: for (ai = &a[j]; ai > a; ai -= m) {
756: aim = &ai[m];
757: if (aim < ai)
758: break; /* wraparound */
759: if (aim->value > ai[0].value ||
760: (aim->value == ai[0].value &&
761: aim->serial > ai[0].serial))
762: break;
763: w.value = ai[0].value;
764: ai[0].value = aim->value;
765: aim->value = w.value;
766: w.serial = ai[0].serial;
767: ai[0].serial = aim->serial;
768: aim->serial = w.serial;
769: }
770: }
771: }
772: }
773:
774: static void
775: unsort(struct line *f, int l, int *b)
776: {
777: int *a, i;
778:
779: a = xcalloc(l + 1, sizeof(*a));
780: for (i = 1; i <= l; i++)
781: a[f[i].serial] = f[i].value;
782: for (i = 1; i <= l; i++)
783: b[i] = a[i];
784: xfree(a);
785: }
786:
787: static int
788: skipline(FILE *f)
789: {
790: int i, c;
791:
792: for (i = 1; (c = getc(f)) != '\n' && c != EOF; i++)
793: continue;
794: return (i);
795: }
796:
797: static void
1.27 ray 798: output(FILE *f1, FILE *f2, int flags)
1.1 joris 799: {
800: int m, i0, i1, j0, j1;
801:
802: rewind(f1);
803: rewind(f2);
1.14 ray 804: m = len[0];
1.1 joris 805: J[0] = 0;
1.14 ray 806: J[m + 1] = len[1] + 1;
1.1 joris 807: for (i0 = 1; i0 <= m; i0 = i1 + 1) {
808: while (i0 <= m && J[i0] == J[i0 - 1] + 1)
809: i0++;
810: j0 = J[i0 - 1] + 1;
811: i1 = i0 - 1;
812: while (i1 < m && J[i1 + 1] == 0)
813: i1++;
814: j1 = J[i1 + 1] - 1;
815: J[i1] = j1;
1.27 ray 816: change(f1, f2, i0, i1, j0, j1, flags);
1.1 joris 817: }
818: if (m == 0)
1.27 ray 819: change(f1, f2, 1, 0, 1, len[1], flags);
1.1 joris 820: if (diff_format == D_IFDEF) {
821: for (;;) {
822: #define c i0
823: if ((c = getc(f1)) == EOF)
824: return;
825: diff_output("%c", c);
826: }
827: #undef c
828: }
829: if (anychange != 0) {
830: if (diff_format == D_CONTEXT)
1.27 ray 831: dump_context_vec(f1, f2, flags);
1.1 joris 832: else if (diff_format == D_UNIFIED)
1.27 ray 833: dump_unified_vec(f1, f2, flags);
1.1 joris 834: }
835: }
836:
1.11 ray 837: static void
1.1 joris 838: range(int a, int b, char *separator)
839: {
840: diff_output("%d", a > b ? b : a);
841: if (a < b)
842: diff_output("%s%d", separator, b);
843: }
844:
1.11 ray 845: static void
1.1 joris 846: uni_range(int a, int b)
847: {
848: if (a < b)
849: diff_output("%d,%d", a, b - a + 1);
850: else if (a == b)
851: diff_output("%d", b);
852: else
853: diff_output("%d,0", b);
854: }
855:
856: static char *
857: preadline(int fd, size_t rlen, off_t off)
858: {
859: char *line;
860: ssize_t nr;
861:
862: line = xmalloc(rlen + 1);
863: if ((nr = pread(fd, line, rlen, off)) < 0) {
864: cvs_log(LP_ERR, "preadline failed");
1.11 ray 865: xfree(line);
1.1 joris 866: return (NULL);
867: }
868: line[nr] = '\0';
869: return (line);
870: }
871:
872: static int
873: ignoreline(char *line)
874: {
875: int ret;
876:
1.11 ray 877: ret = regexec(&ignore_re, line, 0, NULL, 0);
1.1 joris 878: xfree(line);
879: return (ret == 0); /* if it matched, it should be ignored. */
880: }
881:
1.17 tobias 882: static void
883: diff_head(void)
884: {
885: char buf[64];
1.24 tobias 886: struct tm t;
1.17 tobias 887: time_t curr_time;
888:
889: if (diff_rev1 != NULL) {
1.24 tobias 890: gmtime_r(&stb1.st_mtime, &t);
1.17 tobias 891: } else {
892: time(&curr_time);
1.24 tobias 893: localtime_r(&curr_time, &t);
1.17 tobias 894: }
895:
1.24 tobias 896: (void)strftime(buf, sizeof(buf), "%b %G %H:%M:%S -0000", &t);
1.18 tobias 897: diff_output("%s %s %d %s", diff_format == D_CONTEXT ?
1.24 tobias 898: "***" : "---", diff_file1, t.tm_mday, buf);
1.17 tobias 899:
900: if (diff_rev1 != NULL) {
901: rcsnum_tostr(diff_rev1, buf, sizeof(buf));
902: diff_output("\t%s", buf);
903: }
904:
905: diff_output("\n");
906:
1.24 tobias 907: gmtime_r(&stb2.st_mtime, &t);
1.17 tobias 908:
1.24 tobias 909: (void)strftime(buf, sizeof(buf), "%b %G %H:%M:%S -0000", &t);
1.18 tobias 910: diff_output("%s %s %d %s", diff_format == D_CONTEXT ?
1.24 tobias 911: "---" : "+++", diff_file2, t.tm_mday, buf);
1.17 tobias 912:
913: if (diff_rev2 != NULL) {
914: rcsnum_tostr(diff_rev2, buf, sizeof(buf));
915: diff_output("\t%s", buf);
916: }
917:
918: diff_output("\n");
919: }
920:
921: static void
922: rdiff_head(void)
923: {
924: char buf[64];
1.24 tobias 925: struct tm t;
1.17 tobias 926: time_t curr_time;
927:
928: diff_output("%s ", diff_format == D_CONTEXT ? "***" : "---");
929:
930: if (diff_rev1 == NULL) {
931: diff_output("%s", CVS_PATH_DEVNULL);
1.24 tobias 932: gmtime_r(&stb1.st_atime, &t);
1.17 tobias 933: } else {
934: rcsnum_tostr(diff_rev1, buf, sizeof(buf));
1.22 tobias 935: diff_output("%s:%s", diff_file1, buf);
1.25 tobias 936: localtime_r(&stb1.st_mtime, &t);
1.17 tobias 937: }
938:
1.24 tobias 939: (void)strftime(buf, sizeof(buf), "%a %b %e %H:%M:%S %G", &t);
1.17 tobias 940: diff_output("\t%s\n", buf);
941:
942: if (diff_rev2 != NULL) {
1.24 tobias 943: localtime_r(&stb2.st_mtime, &t);
1.17 tobias 944: } else {
945: time(&curr_time);
1.24 tobias 946: localtime_r(&curr_time, &t);
1.17 tobias 947: }
948:
1.24 tobias 949: (void)strftime(buf, sizeof(buf), "%a %b %e %H:%M:%S %G", &t);
1.17 tobias 950:
951: diff_output("%s %s %s\n", diff_format == D_CONTEXT ? "---" : "+++",
1.22 tobias 952: diff_file2, buf);
1.17 tobias 953: }
954:
1.1 joris 955: /*
956: * Indicate that there is a difference between lines a and b of the from file
957: * to get to lines c to d of the to file. If a is greater then b then there
958: * are no lines in the from file involved and this means that there were
959: * lines appended (beginning at b). If c is greater than d then there are
960: * lines missing from the to file.
961: */
962: static void
1.27 ray 963: change(FILE *f1, FILE *f2, int a, int b, int c, int d, int flags)
1.1 joris 964: {
965: static size_t max_context = 64;
1.14 ray 966: int i;
1.1 joris 967:
968: if (diff_format != D_IFDEF && a > b && c > d)
969: return;
970: if (ignore_pats != NULL) {
971: char *line;
972: /*
973: * All lines in the change, insert, or delete must
974: * match an ignore pattern for the change to be
975: * ignored.
976: */
977: if (a <= b) { /* Changes and deletes. */
978: for (i = a; i <= b; i++) {
979: line = preadline(fileno(f1),
980: ixold[i] - ixold[i - 1], ixold[i - 1]);
981: if (!ignoreline(line))
982: goto proceed;
983: }
984: }
985: if (a > b || c <= d) { /* Changes and inserts. */
986: for (i = c; i <= d; i++) {
987: line = preadline(fileno(f2),
988: ixnew[i] - ixnew[i - 1], ixnew[i - 1]);
989: if (!ignoreline(line))
990: goto proceed;
991: }
992: }
993: return;
994: }
995: proceed:
996: if (diff_format == D_CONTEXT || diff_format == D_UNIFIED) {
997: /*
998: * Allocate change records as needed.
999: */
1000: if (context_vec_ptr == context_vec_end - 1) {
1001: ptrdiff_t offset = context_vec_ptr - context_vec_start;
1002: max_context <<= 1;
1.9 ray 1003: context_vec_start = xrealloc(context_vec_start,
1004: max_context, sizeof(*context_vec_start));
1.1 joris 1005: context_vec_end = context_vec_start + max_context;
1006: context_vec_ptr = context_vec_start + offset;
1007: }
1008: if (anychange == 0) {
1009: /*
1010: * Print the context/unidiff header first time through.
1011: */
1.17 tobias 1012: if (cvs_cmdop == CVS_OP_RDIFF)
1013: rdiff_head();
1014: else
1015: diff_head();
1.1 joris 1016:
1017: anychange = 1;
1018: } else if (a > context_vec_ptr->b + (2 * context) + 1 &&
1019: c > context_vec_ptr->d + (2 * context) + 1) {
1020: /*
1021: * If this change is more than 'context' lines from the
1022: * previous change, dump the record and reset it.
1023: */
1024: if (diff_format == D_CONTEXT)
1.27 ray 1025: dump_context_vec(f1, f2, flags);
1.1 joris 1026: else
1.27 ray 1027: dump_unified_vec(f1, f2, flags);
1.1 joris 1028: }
1029: context_vec_ptr++;
1030: context_vec_ptr->a = a;
1031: context_vec_ptr->b = b;
1032: context_vec_ptr->c = c;
1033: context_vec_ptr->d = d;
1034: return;
1035: }
1036: if (anychange == 0)
1037: anychange = 1;
1038: switch (diff_format) {
1039: case D_BRIEF:
1040: return;
1041: case D_NORMAL:
1042: range(a, b, ",");
1043: diff_output("%c", a > b ? 'a' : c > d ? 'd' : 'c');
1044: if (diff_format == D_NORMAL)
1045: range(c, d, ",");
1046: diff_output("\n");
1047: break;
1048: case D_RCSDIFF:
1049: if (a > b)
1050: diff_output("a%d %d\n", b, d - c + 1);
1051: else {
1052: diff_output("d%d %d\n", a, b - a + 1);
1053:
1054: if (!(c > d)) /* add changed lines */
1055: diff_output("a%d %d\n", b, d - c + 1);
1056: }
1057: break;
1058: }
1059: if (diff_format == D_NORMAL || diff_format == D_IFDEF) {
1.27 ray 1060: fetch(ixold, a, b, f1, '<', 1, flags);
1.1 joris 1061: if (a <= b && c <= d && diff_format == D_NORMAL)
1062: diff_output("---\n");
1063: }
1.27 ray 1064: fetch(ixnew, c, d, f2, diff_format == D_NORMAL ? '>' : '\0', 0, flags);
1.1 joris 1065: if (inifdef) {
1066: diff_output("#endif /* %s */\n", ifdefname);
1067: inifdef = 0;
1068: }
1069: }
1070:
1071: static void
1.27 ray 1072: fetch(long *f, int a, int b, FILE *lb, int ch, int oldfile, int flags)
1.1 joris 1073: {
1074: long j, nc;
1075: int i, c, col;
1076:
1077: /*
1078: * When doing #ifdef's, copy down to current line
1079: * if this is the first file, so that stuff makes it to output.
1080: */
1081: if (diff_format == D_IFDEF && oldfile) {
1082: long curpos = ftell(lb);
1083: /* print through if append (a>b), else to (nb: 0 vs 1 orig) */
1084: nc = f[a > b ? b : a - 1] - curpos;
1085: for (i = 0; i < nc; i++)
1086: diff_output("%c", getc(lb));
1087: }
1088: if (a > b)
1089: return;
1090: if (diff_format == D_IFDEF) {
1091: if (inifdef) {
1092: diff_output("#else /* %s%s */\n",
1093: oldfile == 1 ? "!" : "", ifdefname);
1094: } else {
1095: if (oldfile)
1096: diff_output("#ifndef %s\n", ifdefname);
1097: else
1098: diff_output("#ifdef %s\n", ifdefname);
1099: }
1100: inifdef = 1 + oldfile;
1101: }
1102: for (i = a; i <= b; i++) {
1103: fseek(lb, f[i - 1], SEEK_SET);
1104: nc = f[i] - f[i - 1];
1105: if (diff_format != D_IFDEF && ch != '\0') {
1106: diff_output("%c", ch);
1107: if (Tflag == 1 && (diff_format == D_NORMAL ||
1108: diff_format == D_CONTEXT ||
1109: diff_format == D_UNIFIED))
1110: diff_output("\t");
1111: else if (diff_format != D_UNIFIED)
1112: diff_output(" ");
1113: }
1114: col = 0;
1115: for (j = 0; j < nc; j++) {
1116: if ((c = getc(lb)) == EOF) {
1117: if (diff_format == D_RCSDIFF)
1118: cvs_log(LP_ERR,
1119: "No newline at end of file");
1120: else
1121: diff_output("\n\\ No newline at end of "
1.15 joris 1122: "file\n");
1.1 joris 1123: return;
1124: }
1.27 ray 1125: if (c == '\t' && (flags & D_EXPANDTABS)) {
1.1 joris 1126: do {
1127: diff_output(" ");
1128: } while (++col & 7);
1129: } else {
1130: diff_output("%c", c);
1131: col++;
1132: }
1133: }
1134: }
1135: }
1136:
1137: /*
1138: * Hash function taken from Robert Sedgewick, Algorithms in C, 3d ed., p 578.
1139: */
1140: static int
1.27 ray 1141: readhash(FILE *f, int flags)
1.1 joris 1142: {
1143: int i, t, space;
1144: int sum;
1145:
1146: sum = 1;
1147: space = 0;
1.27 ray 1148: if ((flags & (D_FOLDBLANKS|D_IGNOREBLANKS)) == 0) {
1149: if (flags & D_IGNORECASE)
1.1 joris 1150: for (i = 0; (t = getc(f)) != '\n'; i++) {
1151: if (t == EOF) {
1152: if (i == 0)
1153: return (0);
1154: break;
1155: }
1156: sum = sum * 127 + chrtran[t];
1157: }
1158: else
1159: for (i = 0; (t = getc(f)) != '\n'; i++) {
1160: if (t == EOF) {
1161: if (i == 0)
1162: return (0);
1163: break;
1164: }
1165: sum = sum * 127 + t;
1166: }
1167: } else {
1168: for (i = 0;;) {
1169: switch (t = getc(f)) {
1170: case '\t':
1.14 ray 1171: case '\r':
1172: case '\v':
1173: case '\f':
1.1 joris 1174: case ' ':
1175: space++;
1176: continue;
1177: default:
1.27 ray 1178: if (space && (flags & D_IGNOREBLANKS) == 0) {
1.1 joris 1179: i++;
1180: space = 0;
1181: }
1182: sum = sum * 127 + chrtran[t];
1183: i++;
1184: continue;
1185: case EOF:
1186: if (i == 0)
1187: return (0);
1188: /* FALLTHROUGH */
1189: case '\n':
1190: break;
1191: }
1192: break;
1193: }
1194: }
1195: /*
1196: * There is a remote possibility that we end up with a zero sum.
1197: * Zero is used as an EOF marker, so return 1 instead.
1198: */
1199: return (sum == 0 ? 1 : sum);
1200: }
1201:
1202: static int
1203: asciifile(FILE *f)
1204: {
1.14 ray 1205: unsigned char buf[BUFSIZ];
1.1 joris 1206: size_t i, cnt;
1207:
1.27 ray 1208: if (f == NULL)
1.1 joris 1209: return (1);
1210:
1211: rewind(f);
1.11 ray 1212: cnt = fread(buf, 1, sizeof(buf), f);
1.1 joris 1213: for (i = 0; i < cnt; i++)
1214: if (!isprint(buf[i]) && !isspace(buf[i]))
1215: return (0);
1216: return (1);
1217: }
1218:
1.5 xsa 1219: #define begins_with(s, pre) (strncmp(s, pre, sizeof(pre)-1) == 0)
1220:
1.14 ray 1221: static char *
1.1 joris 1222: match_function(const long *f, int pos, FILE *fp)
1223: {
1224: unsigned char buf[FUNCTION_CONTEXT_SIZE];
1225: size_t nc;
1226: int last = lastline;
1.5 xsa 1227: char *state = NULL;
1.1 joris 1228:
1229: lastline = pos;
1230: while (pos > last) {
1231: fseek(fp, f[pos - 1], SEEK_SET);
1232: nc = f[pos] - f[pos - 1];
1233: if (nc >= sizeof(buf))
1234: nc = sizeof(buf) - 1;
1.11 ray 1235: nc = fread(buf, 1, nc, fp);
1.1 joris 1236: if (nc > 0) {
1237: buf[nc] = '\0';
1.28 ! ray 1238: buf[strcspn(buf, "\n")] = '\0';
1.1 joris 1239: if (isalpha(buf[0]) || buf[0] == '_' || buf[0] == '$') {
1.5 xsa 1240: if (begins_with(buf, "private:")) {
1241: if (!state)
1242: state = " (private)";
1243: } else if (begins_with(buf, "protected:")) {
1244: if (!state)
1245: state = " (protected)";
1246: } else if (begins_with(buf, "public:")) {
1247: if (!state)
1248: state = " (public)";
1249: } else {
1.28 ! ray 1250: strlcpy(lastbuf, buf, sizeof lastbuf);
1.5 xsa 1251: if (state)
1252: strlcat(lastbuf, state,
1253: sizeof lastbuf);
1254: lastmatchline = pos;
1255: return lastbuf;
1256: }
1.1 joris 1257: }
1258: }
1259: pos--;
1260: }
1.14 ray 1261: return lastmatchline > 0 ? lastbuf : NULL;
1.1 joris 1262: }
1263:
1264: /* dump accumulated "context" diff changes */
1265: static void
1.27 ray 1266: dump_context_vec(FILE *f1, FILE *f2, int flags)
1.1 joris 1267: {
1268: struct context_vec *cvp = context_vec_start;
1269: int lowa, upb, lowc, upd, do_output;
1270: int a, b, c, d;
1271: char ch, *f;
1272:
1273: if (context_vec_start > context_vec_ptr)
1274: return;
1275:
1276: b = d = 0; /* gcc */
1277: lowa = MAX(1, cvp->a - context);
1.14 ray 1278: upb = MIN(len[0], context_vec_ptr->b + context);
1.1 joris 1279: lowc = MAX(1, cvp->c - context);
1.14 ray 1280: upd = MIN(len[1], context_vec_ptr->d + context);
1.1 joris 1281:
1282: diff_output("***************");
1.27 ray 1283: if ((flags & D_PROTOTYPE)) {
1.14 ray 1284: f = match_function(ixold, lowa-1, f1);
1.1 joris 1285: if (f != NULL) {
1286: diff_output(" ");
1287: diff_output("%s", f);
1288: }
1289: }
1290: diff_output("\n*** ");
1291: range(lowa, upb, ",");
1292: diff_output(" ****\n");
1293:
1294: /*
1295: * Output changes to the "old" file. The first loop suppresses
1296: * output if there were no changes to the "old" file (we'll see
1297: * the "old" lines as context in the "new" list).
1298: */
1299: do_output = 0;
1300: for (; cvp <= context_vec_ptr; cvp++)
1301: if (cvp->a <= cvp->b) {
1302: cvp = context_vec_start;
1303: do_output++;
1304: break;
1305: }
1.14 ray 1306: if (do_output) {
1.1 joris 1307: while (cvp <= context_vec_ptr) {
1308: a = cvp->a;
1309: b = cvp->b;
1310: c = cvp->c;
1311: d = cvp->d;
1312:
1313: if (a <= b && c <= d)
1314: ch = 'c';
1315: else
1316: ch = (a <= b) ? 'd' : 'a';
1317:
1318: if (ch == 'a')
1.27 ray 1319: fetch(ixold, lowa, b, f1, ' ', 0, flags);
1.1 joris 1320: else {
1.27 ray 1321: fetch(ixold, lowa, a - 1, f1, ' ', 0, flags);
1.1 joris 1322: fetch(ixold, a, b, f1,
1.27 ray 1323: ch == 'c' ? '!' : '-', 0, flags);
1.1 joris 1324: }
1325: lowa = b + 1;
1326: cvp++;
1327: }
1.27 ray 1328: fetch(ixold, b + 1, upb, f1, ' ', 0, flags);
1.1 joris 1329: }
1330: /* output changes to the "new" file */
1331: diff_output("--- ");
1332: range(lowc, upd, ",");
1333: diff_output(" ----\n");
1334:
1335: do_output = 0;
1336: for (cvp = context_vec_start; cvp <= context_vec_ptr; cvp++)
1337: if (cvp->c <= cvp->d) {
1338: cvp = context_vec_start;
1339: do_output++;
1340: break;
1341: }
1.14 ray 1342: if (do_output) {
1.1 joris 1343: while (cvp <= context_vec_ptr) {
1344: a = cvp->a;
1345: b = cvp->b;
1346: c = cvp->c;
1347: d = cvp->d;
1348:
1349: if (a <= b && c <= d)
1350: ch = 'c';
1351: else
1352: ch = (a <= b) ? 'd' : 'a';
1353:
1354: if (ch == 'd')
1.27 ray 1355: fetch(ixnew, lowc, d, f2, ' ', 0, flags);
1.1 joris 1356: else {
1.27 ray 1357: fetch(ixnew, lowc, c - 1, f2, ' ', 0, flags);
1.1 joris 1358: fetch(ixnew, c, d, f2,
1.27 ray 1359: ch == 'c' ? '!' : '+', 0, flags);
1.1 joris 1360: }
1361: lowc = d + 1;
1362: cvp++;
1363: }
1.27 ray 1364: fetch(ixnew, d + 1, upd, f2, ' ', 0, flags);
1.1 joris 1365: }
1366: context_vec_ptr = context_vec_start - 1;
1367: }
1368:
1369: /* dump accumulated "unified" diff changes */
1370: static void
1.27 ray 1371: dump_unified_vec(FILE *f1, FILE *f2, int flags)
1.1 joris 1372: {
1373: struct context_vec *cvp = context_vec_start;
1374: int lowa, upb, lowc, upd;
1375: int a, b, c, d;
1376: char ch, *f;
1377:
1378: if (context_vec_start > context_vec_ptr)
1379: return;
1380:
1381: b = d = 0; /* gcc */
1382: lowa = MAX(1, cvp->a - context);
1.14 ray 1383: upb = MIN(len[0], context_vec_ptr->b + context);
1.1 joris 1384: lowc = MAX(1, cvp->c - context);
1.14 ray 1385: upd = MIN(len[1], context_vec_ptr->d + context);
1.1 joris 1386:
1387: diff_output("@@ -");
1388: uni_range(lowa, upb);
1389: diff_output(" +");
1390: uni_range(lowc, upd);
1391: diff_output(" @@");
1.27 ray 1392: if ((flags & D_PROTOTYPE)) {
1.14 ray 1393: f = match_function(ixold, lowa-1, f1);
1.1 joris 1394: if (f != NULL) {
1395: diff_output(" ");
1396: diff_output("%s", f);
1397: }
1398: }
1399: diff_output("\n");
1400:
1401: /*
1402: * Output changes in "unified" diff format--the old and new lines
1403: * are printed together.
1404: */
1405: for (; cvp <= context_vec_ptr; cvp++) {
1406: a = cvp->a;
1407: b = cvp->b;
1408: c = cvp->c;
1409: d = cvp->d;
1410:
1411: /*
1412: * c: both new and old changes
1413: * d: only changes in the old file
1414: * a: only changes in the new file
1415: */
1416: if (a <= b && c <= d)
1417: ch = 'c';
1418: else
1419: ch = (a <= b) ? 'd' : 'a';
1420:
1421: switch (ch) {
1422: case 'c':
1.27 ray 1423: fetch(ixold, lowa, a - 1, f1, ' ', 0, flags);
1424: fetch(ixold, a, b, f1, '-', 0, flags);
1425: fetch(ixnew, c, d, f2, '+', 0, flags);
1.1 joris 1426: break;
1427: case 'd':
1.27 ray 1428: fetch(ixold, lowa, a - 1, f1, ' ', 0, flags);
1429: fetch(ixold, a, b, f1, '-', 0, flags);
1.1 joris 1430: break;
1431: case 'a':
1.27 ray 1432: fetch(ixnew, lowc, c - 1, f2, ' ', 0, flags);
1433: fetch(ixnew, c, d, f2, '+', 0, flags);
1.1 joris 1434: break;
1435: }
1436: lowa = b + 1;
1437: lowc = d + 1;
1438: }
1.27 ray 1439: fetch(ixnew, d + 1, upd, f2, ' ', 0, flags);
1.1 joris 1440:
1441: context_vec_ptr = context_vec_start - 1;
1442: }
1443:
1444: void
1445: diff_output(const char *fmt, ...)
1446: {
1447: va_list vap;
1448: int i;
1449: char *str;
1450:
1451: va_start(vap, fmt);
1452: i = vasprintf(&str, fmt, vap);
1453: va_end(vap);
1454: if (i == -1)
1.21 tobias 1455: fatal("diff_output: could not allocate memory");
1.1 joris 1456: if (diffbuf != NULL)
1.23 tobias 1457: cvs_buf_puts(diffbuf, str);
1.1 joris 1458: else
1459: cvs_printf("%s", str);
1460: xfree(str);
1461: }