1/*
2 * Copyright (c) 1989, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Case Larsen.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1989, 1993, 1994\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif
42
43#if 0
44#ifndef lint
45static char sccsid[] = "From: @(#)comm.c	8.4 (Berkeley) 5/4/95";
46#endif
47#endif
48
49#include <sys/cdefs.h>
50__FBSDID("$FreeBSD: src/usr.bin/comm/comm.c,v 1.21 2004/07/02 22:48:29 tjr Exp $");
51
52#include <err.h>
53#include <limits.h>
54#include <locale.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59#include <wchar.h>
60#include <wctype.h>
61
62#define	MAXLINELEN	(LINE_MAX + 1)
63
64const wchar_t *tabs[] = { L"", L"\t", L"\t\t" };
65
66FILE   *file(const char *);
67void	show(FILE *, const char *, const wchar_t *, wchar_t *);
68int     wcsicoll(const wchar_t *, const wchar_t *);
69static void	usage(void);
70
71int
72main(int argc, char *argv[])
73{
74	int comp, file1done = 0, file2done = 0, read1, read2;
75	int ch, flag1, flag2, flag3, iflag;
76	FILE *fp1, *fp2;
77	const wchar_t *col1, *col2, *col3;
78	wchar_t line1[MAXLINELEN], line2[MAXLINELEN];
79	const wchar_t **p;
80
81	flag1 = flag2 = flag3 = 1;
82	iflag = 0;
83
84	(void) setlocale(LC_ALL, "");
85
86	while ((ch = getopt(argc, argv, "123i")) != -1)
87		switch(ch) {
88		case '1':
89			flag1 = 0;
90			break;
91		case '2':
92			flag2 = 0;
93			break;
94		case '3':
95			flag3 = 0;
96			break;
97		case 'i':
98			iflag = 1;
99			break;
100		case '?':
101		default:
102			usage();
103		}
104	argc -= optind;
105	argv += optind;
106
107	if (argc != 2 || !argv[0] || !argv[1])
108		usage();
109
110	fp1 = file(argv[0]);
111	fp2 = file(argv[1]);
112
113	/* for each column printed, add another tab offset */
114	p = tabs;
115	col1 = col2 = col3 = NULL;
116	if (flag1)
117		col1 = *p++;
118	if (flag2)
119		col2 = *p++;
120	if (flag3)
121		col3 = *p;
122
123	for (read1 = read2 = 1;;) {
124		/* read next line, check for EOF */
125		if (read1) {
126			file1done = !fgetws(line1, MAXLINELEN, fp1);
127			if (file1done && ferror(fp1))
128				err(1, "%s", argv[0]);
129		}
130		if (read2) {
131			file2done = !fgetws(line2, MAXLINELEN, fp2);
132			if (file2done && ferror(fp2))
133				err(1, "%s", argv[1]);
134		}
135
136		/* if one file done, display the rest of the other file */
137		if (file1done) {
138			if (!file2done && col2)
139				show(fp2, argv[1], col2, line2);
140			break;
141		}
142		if (file2done) {
143			if (!file1done && col1)
144				show(fp1, argv[0], col1, line1);
145			break;
146		}
147
148		/* lines are the same */
149		if(iflag)
150			comp = wcsicoll(line1, line2);
151		else
152			comp = wcscoll(line1, line2);
153
154		if (!comp) {
155			read1 = read2 = 1;
156			if (col3)
157				(void)printf("%ls%ls", col3, line1);
158			continue;
159		}
160
161		/* lines are different */
162		if (comp < 0) {
163			read1 = 1;
164			read2 = 0;
165			if (col1)
166				(void)printf("%ls%ls", col1, line1);
167		} else {
168			read1 = 0;
169			read2 = 1;
170			if (col2)
171				(void)printf("%ls%ls", col2, line2);
172		}
173	}
174	exit(0);
175}
176
177void
178show(FILE *fp, const char *fn, const wchar_t *offset, wchar_t *buf)
179{
180
181	do {
182		(void)printf("%ls%ls", offset, buf);
183	} while (fgetws(buf, MAXLINELEN, fp));
184	if (ferror(fp))
185		err(1, "%s", fn);
186}
187
188FILE *
189file(const char *name)
190{
191	FILE *fp;
192
193	if (!strcmp(name, "-"))
194		return (stdin);
195	if ((fp = fopen(name, "r")) == NULL) {
196		err(1, "%s", name);
197	}
198	return (fp);
199}
200
201static void
202usage(void)
203{
204	(void)fprintf(stderr, "usage: comm [-123i] file1 file2\n");
205	exit(1);
206}
207
208int
209wcsicoll(const wchar_t *s1, const wchar_t *s2)
210{
211	wchar_t *p, line1[MAXLINELEN], line2[MAXLINELEN];
212
213	for (p = line1; *s1; s1++)
214		*p++ = towlower(*s1);
215	*p = '\0';
216	for (p = line2; *s2; s2++)
217		*p++ = towlower(*s2);
218	*p = '\0';
219	return (wcscoll(line1, line2));
220}
221