+/*
+ * RCS rcsdiff operation
+ */
+#ifndef lint
+static char rcsid[]=
+"$Header: /usr/.src/devel/CONTRIB/rcs/src/RCS/rcsdiff.c,v 3.12 91/02/22 00:11:20 elan Exp $ Purdue CS";
+#endif
+/*****************************************************************************
+ * generate difference between RCS revisions
+ *****************************************************************************
+ */
+
+/* Copyright (C) 1982, 1988, 1989 Walter Tichy
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Walter Tichy.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Report all problems and direct all questions to:
+ * rcs-bugs@cs.purdue.edu
+ *
+
+
+
+
+
+
+
+*/
+
+
+
+
+/* $Log: rcsdiff.c,v $
+ * Revision 3.12 91/02/22 00:11:20 elan
+ * *** empty log message ***
+ *
+ * Revision 3.11 89/08/15 21:37:01 bostic
+ * Version 4 from Tom Narten at Purdue
+ *
+ * Revision 4.6 89/05/01 15:12:27 narten
+ * changed copyright header to reflect current distribution rules
+ *
+ * Revision 4.5 88/11/08 12:01:51 narten
+ * changes from eggert@sm.unisys.com (Paul Eggert)
+ *
+ * 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 1.1 84/01/23 14:50:18 kcs
+ * Initial revision
+ *
+ * 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 <ctype.h>
+#include "rcsbase.h"
+#define ERRCODE 2 /*error code for exit status */
+extern char *rindex();
+#ifndef lint
+static char rcsbaseid[] = RCSBASE;
+#endif
+static char co[] = CO;
+
+extern int cleanup(); /* cleanup after signals */
+extern char * mktempfile(); /*temporary file name generator */
+extern int fterror(); /*forward for special fatal error func. */
+extern struct hshentry * genrevs(); /*generate delta numbers */
+extern int nerror; /*counter for errors */
+extern int quietflag; /*suppresses diagnostics */
+extern FILE * finptr; /* RCS input file */
+
+char *RCSfilename;
+char *workfilename;
+char * temp1file, * temp2file;
+
+char bops[10];
+char otherops[10];
+
+main (argc, argv)
+int argc; char **argv;
+{
+ char * cmdusage;
+ char commarg[revlength+3];
+ int revnums; /* counter for revision numbers given */
+ char * rev1, * rev2; /* revision numbers from command line */
+ char numericrev[revlength]; /* holds expanded revision number */
+ char * xrev1, * xrev2; /* expanded revision numbers */
+ struct hshentry * gendeltas[hshsize];/*stores deltas to be generated*/
+ struct hshentry * target;
+ char * boption, * otheroption;
+ int exit_stats;
+ int diffs_found;
+ char *argp;
+ register c;
+
+ catchints();
+ otheroption = otherops + 2;
+ boption = bops + 2;
+ cmdid = "rcsdiff";
+ cmdusage = "command format:\n rcsdiff [-biwt] [-q] [-cefhn] [-rrev1] [-rrev2] file";
+ diffs_found=revnums=0;
+ while (--argc,++argv, argc>=1 && ((*argv)[0] == '-')) {
+ argp = &((*argv)[1]);
+ while (c = *argp++) switch (c) {
+ case 'r':
+ if (*argp!='\0') {
+ if (revnums==0) {
+ rev1= argp; revnums=1;
+ } elif (revnums==1) {
+ rev2= argp; revnums=2;
+ } else {
+ fterror("too many revision numbers");
+ }
+ } /* do nothing for empty -r */
+ argp += strlen(argp);
+ break;
+ case 'b':
+ case 'i':
+ case 'w':
+ case 't':
+ if (!rindex(bops + 2, c))
+ *boption++ = c;
+ break;
+ case 'q':
+ quietflag=true;
+ break;
+ case 'c':
+ case 'e':
+ case 'f':
+ case 'h':
+ case 'n':
+ if (otheroption == otherops + 2) {
+ *otheroption++ = c;
+ if (c == 'c' && isdigit(*argp)) {
+ while (isdigit(*argp) && otheroption < otherops+sizeof(otherops)-1)
+ *otheroption++ = *argp++;
+ if (*argp)
+ faterror("-c: bad count");
+ argp = "";
+ }
+ } else {
+ fterror("Options c,e,f,h,n are mutually exclusive");
+ }
+ break;
+ default:
+ fterror("unknown option: %s\n%s", *argv,cmdusage);
+ };
+ } /* end of option processing */
+
+ if (boption != bops + 2) {
+ bops[0] = ' ';
+ bops[1] = '-';
+ boption = bops;
+ }
+ if (otheroption != otherops + 2) {
+ otherops[0] = ' ';
+ otherops[1] = '-';
+ otheroption = otherops;
+ }
+ if (argc<1) fterror("No input file\n%s",cmdusage);
+
+ /* now handle all filenames */
+ do {
+ finptr=NULL;
+
+ if (pairfilenames(argc,argv,true,false)!=1) continue;
+ diagnose("===================================================================");
+ diagnose("RCS file: %s",RCSfilename);
+ if (revnums<2 && !(access(workfilename,4)==0)) {
+ error("Can't open %s",workfilename);
+ continue;
+ }
+ if (!trysema(RCSfilename,false)) continue; /* give up */
+
+
+ gettree(); /* reads in the delta tree */
+
+ if (Head==nil) {
+ error("no revisions present");
+ continue;
+ }
+ if (revnums==0)
+ rev1=Dbranch!=nil?Dbranch->num:Head->num; /* default rev1 */
+
+ if (!expandsym(rev1,numericrev)) continue;
+ if (!(target=genrevs(numericrev,(char *)nil,(char *)nil,(char *)nil,gendeltas))) continue;
+ xrev1=target->num;
+
+ if (revnums==2) {
+ if (!expandsym(rev2,numericrev)) continue;
+ if (!(target=genrevs(numericrev,(char *)nil,(char *)nil,(char *)nil,gendeltas))) continue;
+ xrev2=target->num;
+ }
+
+
+ temp1file=mktempfile("/tmp/",TMPFILE1);
+ diagnose("retrieving revision %s",xrev1);
+ VOID sprintf(commarg,"-p%s",xrev1);
+ if (run((char*)nil,temp1file, co,"-q",commarg,RCSfilename,(char*)nil)){
+ error("co failed");
+ continue;
+ }
+ if (revnums<=1) {
+ temp2file=workfilename;
+ diagnose("diff%s%s -r%s %s",boption,otheroption,xrev1,workfilename);
+ } else {
+ temp2file=mktempfile("/tmp/",TMPFILE2);
+ diagnose("retrieving revision %s",xrev2);
+ VOID sprintf(commarg,"-p%s",xrev2);
+ if (run((char*)nil,temp2file, co,"-q",commarg,RCSfilename,(char *)nil)){
+ error("co failed");
+ continue;
+ }
+ diagnose("diff%s%s -r%s -r%s",boption,otheroption,xrev1,xrev2);
+ }
+
+ exit_stats =
+ *boption
+ ? *otheroption
+ ? run((char*)nil,(char*)nil, DIFF, boption+1, otheroption+1, temp1file,temp2file,(char*)nil)
+ : run((char*)nil,(char*)nil, DIFF, boption+1, temp1file,temp2file,(char*)nil)
+ : *otheroption
+ ? run((char*)nil,(char*)nil, DIFF, otheroption+1, temp1file,temp2file,(char*)nil)
+ : run((char*)nil,(char*)nil, DIFF, temp1file,temp2file,(char*)nil);
+
+ if (exit_stats == (1 << BYTESIZ))
+ diffs_found = 1;
+ else if (exit_stats != 0) {
+ error ("diff failed");
+ continue;
+ }
+ } while (cleanup(),
+ ++argv, --argc >=1);
+
+
+ exit(nerror ? ERRCODE : diffs_found);
+}
+
+
+/*VARARGS3*/
+fterror(e, e1, e2)
+char * e, * e1, * e2;
+/* prints error message and terminates program with ERRCODE */
+{ nerror++;
+ VOID fprintf(stderr,"%s error: ",cmdid);
+ VOID fprintf(stderr,e, e1, e2);
+ VOID fprintf(stderr,"\n%s aborted\n",cmdid);
+ VOID cleanup();
+ exit(ERRCODE);
+}
+
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