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- /*
- * RCS file comparison
- */
- /*****************************************************************************
- * rcsfcmp()
- * Testprogram: define FCMPTEST
- *****************************************************************************
- */
-
- /* Copyright (C) 1982, 1988, 1989 Walter Tichy
- Copyright 1990, 1991 by Paul Eggert
- Distributed under license by the Free Software Foundation, Inc.
-
- This file is part of RCS.
-
- RCS is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- RCS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with RCS; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- Report problems and direct all questions to:
-
- rcs-bugs@cs.purdue.edu
-
- */
-
-
-
-
-
- /* $Log: rcsfcmp.c,v $
- * Revision 5.9 1991/10/07 17:32:46 eggert
- * Count log lines correctly.
- *
- * Revision 5.8 1991/08/19 03:13:55 eggert
- * Tune.
- *
- * Revision 5.7 1991/04/21 11:58:22 eggert
- * Fix errno bug. Add MS-DOS support.
- *
- * Revision 5.6 1991/02/28 19:18:47 eggert
- * Open work file at most once.
- *
- * Revision 5.5 1990/11/27 09:26:05 eggert
- * Fix comment leader bug.
- *
- * Revision 5.4 1990/11/01 05:03:42 eggert
- * Permit arbitrary data in logs and comment leaders.
- *
- * Revision 5.3 1990/09/11 02:41:15 eggert
- * Don't ignore differences inside keyword strings if -ko is set.
- *
- * Revision 5.1 1990/08/29 07:13:58 eggert
- * Clean old log messages too.
- *
- * Revision 5.0 1990/08/22 08:12:49 eggert
- * Don't append "checked in with -k by " log to logs,
- * so that checking in a program with -k doesn't change it.
- * Ansify and Posixate. Remove lint.
- *
- * Revision 4.5 89/05/01 15:12:42 narten
- * changed copyright header to reflect current distribution rules
- *
- * Revision 4.4 88/08/09 19:12:50 eggert
- * Shrink stdio code size.
- *
- * Revision 4.3 87/12/18 11:40:02 narten
- * lint cleanups (Guy Harris)
- *
- * Revision 4.2 87/10/18 10:33:06 narten
- * updting version number. Changes relative to 1.1 actually relative to
- * 4.1
- *
- * Revision 1.2 87/03/27 14:22:19 jenkins
- * Port to suns
- *
- * Revision 4.1 83/05/10 16:24:04 wft
- * Marker matching now uses trymatch(). Marker pattern is now
- * checked precisely.
- *
- * Revision 3.1 82/12/04 13:21:40 wft
- * Initial revision.
- *
- */
-
- /*
- #define FCMPTEST
- */
- /* Testprogram; prints out whether two files are identical,
- * except for keywords
- */
-
- #include "rcsbase.h"
-
- libId(fcmpId, "$Id: rcsfcmp.c,v 5.9 1991/10/07 17:32:46 eggert Exp $")
-
- static int
- discardkeyval(c, f)
- register int c;
- register RILE *f;
- {
- for (;;)
- switch (c) {
- case KDELIM:
- case '\n':
- return c;
- default:
- Igeteof(f, c, return EOF;);
- break;
- }
- }
-
- int
- rcsfcmp(xfp, xstatp, ufname, delta)
- register RILE *xfp;
- struct stat const *xstatp;
- char const *ufname;
- struct hshentry const *delta;
- /* Compare the files xfp and ufname. Return zero
- * if xfp has the same contents as ufname and neither has keywords,
- * otherwise -1 if they are the same ignoring keyword values,
- * and 1 if they differ even ignoring
- * keyword values. For the LOG-keyword, rcsfcmp skips the log message
- * given by the parameter delta in xfp. Thus, rcsfcmp returns nonpositive
- * if xfp contains the same as ufname, with the keywords expanded.
- * Implementation: character-by-character comparison until $ is found.
- * If a $ is found, read in the marker keywords; if they are real keywords
- * and identical, read in keyword value. If value is terminated properly,
- * disregard it and optionally skip log message; otherwise, compare value.
- */
- {
- register int xc, uc;
- char xkeyword[keylength+2];
- int eqkeyvals;
- register RILE *ufp;
- register int xeof, ueof;
- register char * tp;
- register char const *sp;
- int result;
- enum markers match1;
- struct stat ustat;
-
- if (!(ufp = Iopen(ufname, FOPEN_R_WORK, &ustat))) {
- efaterror(ufname);
- }
- xeof = ueof = false;
- if (Expand==OLD_EXPAND) {
- if (!(result = xstatp->st_size!=ustat.st_size)) {
- # if has_mmap && large_memory
- result = !!memcmp(xfp->base,ufp->base,(size_t)xstatp->st_size);
- # else
- for (;;) {
- /* get the next characters */
- Igeteof(xfp, xc, xeof=true;);
- Igeteof(ufp, uc, ueof=true;);
- if (xeof | ueof)
- goto eof;
- if (xc != uc)
- goto return1;
- }
- # endif
- }
- } else {
- xc = 0;
- uc = 0; /* Keep lint happy. */
- result = 0;
-
- for (;;) {
- if (xc != KDELIM) {
- /* get the next characters */
- Igeteof(xfp, xc, xeof=true;);
- Igeteof(ufp, uc, ueof=true;);
- if (xeof | ueof)
- goto eof;
- } else {
- /* try to get both keywords */
- tp = xkeyword;
- for (;;) {
- Igeteof(xfp, xc, xeof=true;);
- Igeteof(ufp, uc, ueof=true;);
- if (xeof | ueof)
- goto eof;
- if (xc != uc)
- break;
- switch (xc) {
- default:
- if (xkeyword+keylength <= tp)
- break;
- *tp++ = xc;
- continue;
- case '\n': case KDELIM: case VDELIM:
- break;
- }
- break;
- }
- if (
- (xc==KDELIM || xc==VDELIM) && (uc==KDELIM || uc==VDELIM) &&
- (*tp = xc, (match1 = trymatch(xkeyword)) != Nomatch)
- ) {
- #ifdef FCMPTEST
- VOID printf("found common keyword %s\n",xkeyword);
- #endif
- result = -1;
- for (;;) {
- if (xc != uc) {
- xc = discardkeyval(xc, xfp);
- uc = discardkeyval(uc, ufp);
- if ((xeof = xc==EOF) | (ueof = uc==EOF))
- goto eof;
- eqkeyvals = false;
- break;
- }
- switch (xc) {
- default:
- Igeteof(xfp, xc, xeof=true;);
- Igeteof(ufp, uc, ueof=true;);
- if (xeof | ueof)
- goto eof;
- continue;
-
- case '\n': case KDELIM:
- eqkeyvals = true;
- break;
- }
- break;
- }
- if (xc != uc)
- goto return1;
- if (xc==KDELIM) {
- /* Skip closing KDELIM. */
- Igeteof(xfp, xc, xeof=true;);
- Igeteof(ufp, uc, ueof=true;);
- if (xeof | ueof)
- goto eof;
- /* if the keyword is LOG, also skip the log message in xfp*/
- if (match1==Log) {
- /* first, compute the number of line feeds in log msg */
- unsigned lncnt;
- size_t ls, ccnt;
- sp = delta->log.string;
- ls = delta->log.size;
- if (ls<sizeof(ciklog)-1 || memcmp(sp,ciklog,sizeof(ciklog)-1)) {
- /* This log message was inserted. */
- lncnt = 3;
- while (ls--) if (*sp++=='\n') lncnt++;
- for (;;) {
- if (xc=='\n')
- if(--lncnt==0) break;
- Igeteof(xfp, xc, goto returnresult;);
- }
- /* skip last comment leader */
- /* Can't just skip another line here, because there may be */
- /* additional characters on the line (after the Log....$) */
- for (ccnt=Comment.size; ccnt--; ) {
- Igeteof(xfp, xc, goto returnresult;);
- if(xc=='\n') break;
- /*
- * Read to the end of the comment leader or '\n',
- * whatever comes first. Some editors strip
- * trailing white space from a leader like " * ".
- */
- }
- }
- }
- } else {
- /* both end in the same character, but not a KDELIM */
- /* must compare string values.*/
- #ifdef FCMPTEST
- VOID printf("non-terminated keywords %s, potentially different values\n",xkeyword);
- #endif
- if (!eqkeyvals)
- goto return1;
- }
- }
- }
- if (xc != uc)
- goto return1;
- }
- }
-
- eof:
- if (xeof==ueof)
- goto returnresult;
- return1:
- result = 1;
- returnresult:
- Ifclose(ufp);
- return result;
- }
-
-
-
- #ifdef FCMPTEST
-
- char const cmdid[] = "rcsfcmp";
-
- main(argc, argv)
- int argc; char *argv[];
- /* first argument: comment leader; 2nd: log message, 3rd: expanded file,
- * 4th: unexpanded file
- */
- { struct hshentry delta;
-
- Comment.string = argv[1];
- Comment.size = strlen(argv[1]);
- delta.log.string = argv[2];
- delta.log.size = strlen(argv[2]);
- if (rcsfcmp(Iopen(argv[3], FOPEN_R_WORK, (struct stat*)0), argv[4], &delta))
- VOID printf("files are the same\n");
- else VOID printf("files are different\n");
- }
- #endif
-