merge.c revision 9 
1/* merge - three-way file merge */
2
3/* Copyright 1991 by Paul Eggert
4   Distributed under license by the Free Software Foundation, Inc.
5
6This file is part of RCS.
7
8RCS is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2, or (at your option)
11any later version.
12
13RCS is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with RCS; see the file COPYING.  If not, write to
20the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
21
22Report problems and direct all questions to:
23
24    rcs-bugs@cs.purdue.edu
25
26*/
27
28#include "rcsbase.h"
29
30
31static char const usage[] =
32 "\nmerge: usage: merge [-p] [-q] [-L label1 [-L label3]] file1 file2 file3\n";
33
34	static exiting void
35badoption(a)
36	char const *a;
37{
38	faterror("unknown option: %s%s", a-2, usage);
39}
40
41
42mainProg(mergeId, "merge", "$Id: merge.c,v 1.2 1991/08/19 03:13:55 eggert Exp $")
43{
44	register char const *a;
45	char const *label[2], *arg[3];
46	int labels, tostdout;
47
48	labels = 0;
49	tostdout = false;
50
51	while ((a = *++argv)  &&  *a++ == '-') {
52		switch (*a++) {
53			case 'p': tostdout = true; break;
54			case 'q': quietflag = true; break;
55			case 'L':
56				if (1<labels)
57					faterror("too many -L options");
58				if (!(label[labels++] = *++argv))
59					faterror("-L needs following argument");
60				--argc;
61				break;
62			default:
63				badoption(a);
64		}
65		if (*a)
66			badoption(a);
67		--argc;
68	}
69
70	if (argc != 4)
71		faterror("%s arguments%s",
72			argc<4 ? "not enough" : "too many",  usage
73		);
74
75	/* This copy keeps us `const'-clean.  */
76	arg[0] = argv[0];
77	arg[1] = argv[1];
78	arg[2] = argv[2];
79
80	switch (labels) {
81		case 0: label[0] = arg[0]; /* fall into */
82		case 1: label[1] = arg[2];
83	}
84
85	exitmain(merge(tostdout, label, arg));
86}
87
88
89#if lint
90#	define exiterr mergeExit
91#endif
92	exiting void
93exiterr()
94{
95	tempunlink();
96	_exit(DIFF_TROUBLE);
97}
98