home *** CD-ROM | disk | FTP | other *** search
- /*
- * RCS rcsdiff operation
- */
- /*****************************************************************************
- * generate difference between RCS revisions
- *****************************************************************************
- */
-
- /* Copyright (C) 1982, 1988, 1989 Walter Tichy
- Copyright 1990, 1991, 1992 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: rcsdiff.c,v $
- * Revision 5.13 1992/02/17 23:02:23 eggert
- * Output more readable context diff headers.
- * Suppress needless checkout and comparison of identical revisions.
- *
- * Revision 5.12 1992/01/24 18:44:19 eggert
- * Add GNU diff 1.15.2's new options. lint -> RCS_lint
- *
- * Revision 5.11 1992/01/06 02:42:34 eggert
- * Update usage string.
- *
- * Revision 5.10 1991/10/07 17:32:46 eggert
- * Remove lint.
- *
- * Revision 5.9 1991/08/19 03:13:55 eggert
- * Add RCSINIT, -r$. Tune.
- *
- * Revision 5.8 1991/04/21 11:58:21 eggert
- * Add -x, RCSINIT, MS-DOS support.
- *
- * Revision 5.7 1990/12/13 06:54:07 eggert
- * GNU diff 1.15 has -u.
- *
- * Revision 5.6 1990/11/01 05:03:39 eggert
- * Remove unneeded setid check.
- *
- * Revision 5.5 1990/10/04 06:30:19 eggert
- * Accumulate exit status across files.
- *
- * Revision 5.4 1990/09/27 01:31:43 eggert
- * Yield 1, not EXIT_FAILURE, when diffs are found.
- *
- * Revision 5.3 1990/09/11 02:41:11 eggert
- * Simplify -kkvl test.
- *
- * Revision 5.2 1990/09/04 17:07:19 eggert
- * Diff's argv was too small by 1.
- *
- * Revision 5.1 1990/08/29 07:13:55 eggert
- * Add -kkvl.
- *
- * Revision 5.0 1990/08/22 08:12:46 eggert
- * Add -k, -V. Don't use access(). Add setuid support.
- * Remove compile-time limits; use malloc instead.
- * Don't pass arguments with leading '+' to diff; GNU DIFF treats them as options.
- * Add GNU diff's flags. Make lock and temp files faster and safer.
- * Ansify and Posixate.
- *
- * Revision 4.6 89/05/01 15:12:27 narten
- * changed copyright header to reflect current distribution rules
- *
- * Revision 4.5 88/08/09 19:12:41 eggert
- * Use execv(), not system(); yield exit status like diff(1)s; allow cc -R.
- *
- * Revision 4.4 87/12/18 11:37:46 narten
- * changes Jay Lepreau made in the 4.3 BSD version, to add support for
- * "-i", "-w", and "-t" flags and to permit flags to be bundled together,
- * merged in.
- *
- * Revision 4.3 87/10/18 10:31:42 narten
- * Updating version numbers. Changes relative to 1.1 actually
- * relative to 4.1
- *
- * Revision 1.3 87/09/24 13:59:21 narten
- * Sources now pass through lint (if you ignore printf/sprintf/fprintf
- * warnings)
- *
- * Revision 1.2 87/03/27 14:22:15 jenkins
- * Port to suns
- *
- * Revision 4.1 83/05/03 22:13:19 wft
- * Added default branch, option -q, exit status like diff.
- * Added fterror() to replace faterror().
- *
- * Revision 3.6 83/01/15 17:52:40 wft
- * Expanded mainprogram to handle multiple RCS files.
- *
- * Revision 3.5 83/01/06 09:33:45 wft
- * Fixed passing of -c (context) option to diff.
- *
- * Revision 3.4 82/12/24 15:28:38 wft
- * Added call to catchsig().
- *
- * Revision 3.3 82/12/10 16:08:17 wft
- * Corrected checking of return code from diff; improved error msgs.
- *
- * Revision 3.2 82/12/04 13:20:09 wft
- * replaced getdelta() with gettree(). Changed diagnostics.
- *
- * Revision 3.1 82/11/28 19:25:04 wft
- * Initial revision.
- *
- */
- #include "rcsbase.h"
-
- #if DIFF_L
- static char const *setup_label P((struct buf*,char const*,char const[datesize]));
- #endif
- static void cleanup P((void));
-
- static int exitstatus;
- static RILE *workptr;
- static struct stat workstat;
-
- mainProg(rcsdiffId, "rcsdiff", "$Id: rcsdiff.c,v 5.13 1992/02/17 23:02:23 eggert Exp $")
- {
- static char const cmdusage[] =
- "\nrcsdiff usage: rcsdiff [-ksubst] [-q] [-rrev1 [-rrev2]] [-Vn] [-xsuff] [diff options] file ...";
-
- int revnums; /* counter for revision numbers given */
- char const *rev1, *rev2; /* revision numbers from command line */
- char const *xrev1, *xrev2; /* expanded revision numbers */
- char const *expandarg, *lexpandarg, *versionarg;
- #if DIFF_L
- static struct buf labelbuf[2];
- int file_labels;
- char const **diff_label1, **diff_label2;
- char date2[datesize];
- #endif
- char const *cov[9];
- char const **diffv, **diffp; /* argv for subsidiary diff */
- char const **pp, *p, *diffvstr;
- struct buf commarg;
- struct buf numericrev; /* expanded revision number */
- struct hshentries *gendeltas; /* deltas to be generated */
- struct hshentry * target;
- char *a, *dcp, **newargv;
- int no_diff_means_no_output;
- register c;
-
- exitstatus = DIFF_SUCCESS;
-
- bufautobegin(&commarg);
- bufautobegin(&numericrev);
- revnums = 0;
- rev1 = rev2 = xrev2 = nil;
- #if DIFF_L
- file_labels = 0;
- #endif
- expandarg = versionarg = 0;
- no_diff_means_no_output = true;
- suffixes = X_DEFAULT;
-
- /* Room for args + 2 i/o [+ 2 labels] + 1 file + 1 trailing null. */
- diffp = diffv = tnalloc(char const*, argc + 4 + 2*DIFF_L);
- *diffp++ = nil;
- *diffp++ = nil;
- *diffp++ = DIFF;
-
- argc = getRCSINIT(argc, argv, &newargv);
- argv = newargv;
- while (a = *++argv, 0<--argc && *a++=='-') {
- dcp = a;
- while (c = *a++) switch (c) {
- case 'r':
- switch (++revnums) {
- case 1: rev1=a; break;
- case 2: rev2=a; break;
- default: faterror("too many revision numbers");
- }
- goto option_handled;
- case '-': case 'D':
- no_diff_means_no_output = false;
- /* fall into */
- case 'C': case 'F': case 'I': case 'L': case 'W':
- #if DIFF_L
- if (c == 'L' && ++file_labels == 2)
- faterror("too many -L options");
- #endif
- *dcp++ = c;
- if (*a)
- do *dcp++ = *a++;
- while (*a);
- else {
- if (!--argc)
- faterror("-%c needs following argument%s",
- c, cmdusage
- );
- *diffp++ = *argv++;
- }
- break;
- case 'y':
- no_diff_means_no_output = false;
- /* fall into */
- case 'B': case 'H': case 'T':
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
- case 'h': case 'i': case 'n': case 'p':
- case 't': case 'u': case 'w':
- *dcp++ = c;
- break;
- case 'q':
- quietflag=true;
- break;
- case 'x':
- suffixes = *argv + 2;
- goto option_handled;
- case 'V':
- versionarg = *argv;
- setRCSversion(versionarg);
- goto option_handled;
- case 'k':
- expandarg = *argv;
- if (0 <= str2expmode(expandarg+2))
- goto option_handled;
- /* fall into */
- default:
- faterror("unknown option: %s%s", *argv, cmdusage);
- };
- option_handled:
- if (dcp != *argv+1) {
- *dcp = 0;
- *diffp++ = *argv;
- }
- } /* end of option processing */
-
- if (argc<1) faterror("no input file%s", cmdusage);
-
- for (pp = diffv+3, c = 0; pp<diffp; )
- c += strlen(*pp++) + 1;
- diffvstr = a = tnalloc(char, c + 1);
- for (pp = diffv+3; pp<diffp; ) {
- p = *pp++;
- *a++ = ' ';
- while ((*a = *p++))
- a++;
- }
- *a = 0;
-
- #if DIFF_L
- diff_label1 = diff_label2 = nil;
- if (file_labels < 2) {
- if (!file_labels)
- diff_label1 = diffp++;
- diff_label2 = diffp++;
- }
- #endif
- diffp[2] = nil;
-
- cov[0] = 0;
- cov[2] = CO;
- cov[3] = "-q";
-
- /* now handle all filenames */
- do {
- ffree();
-
- if (pairfilenames(argc, argv, rcsreadopen, true, false) <= 0)
- continue;
- diagnose("===================================================================\nRCS file: %s\n",RCSfilename);
- if (!rev2) {
- /* Make sure work file is readable, and get its status. */
- if (!(workptr = Iopen(workfilename,FOPEN_R_WORK,&workstat))) {
- eerror(workfilename);
- continue;
- }
- }
-
-
- gettree(); /* reads in the delta tree */
-
- if (Head==nil) {
- error("no revisions present");
- continue;
- }
- if (revnums==0 || !*rev1)
- rev1 = Dbranch ? Dbranch : Head->num;
-
- if (!fexpandsym(rev1, &numericrev, workptr)) continue;
- if (!(target=genrevs(numericrev.string,(char *)nil,(char *)nil,(char *)nil,&gendeltas))) continue;
- xrev1=target->num;
- #if DIFF_L
- if (diff_label1)
- *diff_label1 = setup_label(&labelbuf[0], target->num, target->date);
- #endif
-
- lexpandarg = expandarg;
- if (revnums==2) {
- if (!fexpandsym(
- *rev2 ? rev2 : Dbranch ? Dbranch : Head->num,
- &numericrev,
- workptr
- ))
- continue;
- if (!(target=genrevs(numericrev.string,(char *)nil,(char *)nil,(char *)nil,&gendeltas))) continue;
- xrev2=target->num;
- if (no_diff_means_no_output && xrev1 == xrev2)
- continue;
- } else if (
- target->lockedby
- && !lexpandarg
- && Expand == KEYVAL_EXPAND
- && WORKMODE(RCSstat.st_mode,true) == workstat.st_mode
- )
- lexpandarg = "-kkvl";
- Izclose(&workptr);
- #if DIFF_L
- if (diff_label2)
- if (revnums == 2)
- *diff_label2 = setup_label(&labelbuf[1], target->num, target->date);
- else {
- time2date(workstat.st_mtime, date2);
- *diff_label2 = setup_label(&labelbuf[1], (char*)0, date2);
- }
- #endif
-
- diagnose("retrieving revision %s\n", xrev1);
- bufscpy(&commarg, "-p");
- bufscat(&commarg, xrev1);
-
- cov[1] = diffp[0] = maketemp(0);
- pp = &cov[4];
- *pp++ = commarg.string;
- if (lexpandarg)
- *pp++ = lexpandarg;
- if (versionarg)
- *pp++ = versionarg;
- *pp++ = RCSfilename;
- *pp = 0;
-
- if (runv(cov)) {
- error("co failed");
- continue;
- }
- if (!rev2) {
- diffp[1] = workfilename;
- if (workfilename[0] == '+') {
- /* Some diffs have options with leading '+'. */
- char *dp = ftnalloc(char, strlen(workfilename)+3);
- diffp[1] = dp;
- *dp++ = '.';
- *dp++ = SLASH;
- VOID strcpy(dp, workfilename);
- }
- } else {
- diagnose("retrieving revision %s\n",xrev2);
- bufscpy(&commarg, "-p");
- bufscat(&commarg, xrev2);
- cov[1] = diffp[1] = maketemp(1);
- cov[4] = commarg.string;
- if (runv(cov)) {
- error("co failed");
- continue;
- }
- }
- if (!rev2)
- diagnose("diff%s -r%s %s\n", diffvstr, xrev1, workfilename);
- else
- diagnose("diff%s -r%s -r%s\n", diffvstr, xrev1, xrev2);
-
- switch (runv(diffv)) {
- case DIFF_SUCCESS:
- break;
- case DIFF_FAILURE:
- if (exitstatus == DIFF_SUCCESS)
- exitstatus = DIFF_FAILURE;
- break;
- default:
- error("diff failed");
- }
- } while (cleanup(),
- ++argv, --argc >=1);
-
-
- tempunlink();
- exitmain(exitstatus);
- }
-
- static void
- cleanup()
- {
- if (nerror) exitstatus = DIFF_TROUBLE;
- Izclose(&finptr);
- Izclose(&workptr);
- }
-
- #if RCS_lint
- # define exiterr rdiffExit
- #endif
- exiting void
- exiterr()
- {
- tempunlink();
- _exit(DIFF_TROUBLE);
- }
-
- #if DIFF_L
- static char const *
- setup_label(b, num, date)
- struct buf *b;
- char const *num;
- char const date[datesize];
- {
- char *p;
- char datestr[datesize];
- VOID date2str(date, datestr);
- bufalloc(b, strlen(workfilename) + datesize+3 + (num?strlen(num)+1:0));
- p = b->string;
- VOID sprintf(p, "-L%s\t%s", workfilename, datestr);
- if (num)
- VOID sprintf(p + strlen(p), "\t%s", num);
- return p;
- }
- #endif
-