merge.c revision 11891 
1/* merge - three-way file merge */
2
3/* Copyright 1991, 1992, 1993, 1994, 1995 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.
20If not, write to the Free Software Foundation,
2159 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22
23Report problems and direct all questions to:
24
25    rcs-bugs@cs.purdue.edu
26
27*/
28
29#include "rcsbase.h"
30
31static void badoption P((char const*));
32
33static char const usage[] =
34 "\nmerge: usage: merge [-AeEpqxX3] [-L lab [-L lab [-L lab]]] file1 file2 file3";
35
36	static void
37badoption(a)
38	char const *a;
39{
40	error("unknown option: %s%s", a, usage);
41}
42
43
44mainProg(mergeId, "merge", "$Id: merge.c,v 1.8 1995/06/16 06:19:24 eggert Exp $")
45{
46	register char const *a;
47	char const *arg[3], *label[3], *edarg = 0;
48	int labels, tostdout;
49
50	labels = 0;
51	tostdout = false;
52
53	for (;  (a = *++argv)  &&  *a++ == '-';  --argc) {
54		switch (*a++) {
55			case 'A': case 'E': case 'e':
56				if (edarg  &&  edarg[1] != (*argv)[1])
57					error("%s and %s are incompatible",
58						edarg, *argv
59					);
60				edarg = *argv;
61				break;
62
63			case 'p': tostdout = true; break;
64			case 'q': quietflag = true; break;
65
66			case 'L':
67				if (3 <= labels)
68					faterror("too many -L options");
69				if (!(label[labels++] = *++argv))
70					faterror("-L needs following argument");
71				--argc;
72				break;
73
74			case 'V':
75				printf("RCS version %s\n", RCS_version_string);
76				exitmain(0);
77
78			default:
79				badoption(a - 2);
80				continue;
81		}
82		if (*a)
83			badoption(a - 2);
84	}
85
86	if (argc != 4)
87		faterror("%s arguments%s",
88			argc<4 ? "not enough" : "too many",  usage
89		);
90
91	/* This copy keeps us `const'-clean.  */
92	arg[0] = argv[0];
93	arg[1] = argv[1];
94	arg[2] = argv[2];
95
96	for (;  labels < 3;  labels++)
97		label[labels] = arg[labels];
98
99	if (nerror)
100		exiterr();
101	exitmain(merge(tostdout, edarg, label, arg));
102}
103
104
105#if RCS_lint
106#	define exiterr mergeExit
107#endif
108	void
109exiterr()
110{
111	tempunlink();
112	_exit(DIFF_TROUBLE);
113}
114