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
6 This file is part of RCS.
7
8 RCS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
11 any later version.
12
13 RCS is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with RCS; see the file COPYING.
20 If not, write to the Free Software Foundation,
21 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22
23 Report problems and direct all questions to:
24
25 rcs-bugs@cs.purdue.edu
26
27 */
28
29 #include "rcsbase.h"
30
31 static void badoption P((char const*));
32
33 static char const usage[] =
34 "\nmerge: usage: merge [-AeEpqxX3] [-L lab [-L lab [-L lab]]] file1 file2 file3";
35
36 static void
badoption(a)37 badoption(a)
38 char const *a;
39 {
40 error("unknown option: %s%s", a, usage);
41 }
42
43
44 mainProg(mergeId, "merge", "$FreeBSD$")
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
exiterr()109 exiterr()
110 {
111 tempunlink();
112 _exit(DIFF_TROUBLE);
113 }
114