/*
* Copyright (c) 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Case Larsen.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif
#if 0
#ifndef lint
static char sccsid[] = "From: @(#)comm.c 8.4 (Berkeley) 5/4/95";
#endif
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <err.h>
#include <limits.h>
#include <locale.h>
#include <stdint.h>
#define _WITH_GETLINE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
static int iflag;
static const char *tabs[] = { "", "\t", "\t\t" };
static FILE *file(const char *);
static wchar_t *convert(const char *);
static void show(FILE *, const char *, const char *, char **, size_t *);
static void usage(void);
int
main(int argc, char *argv[])
{
int comp, read1, read2;
int ch, flag1, flag2, flag3;
FILE *fp1, *fp2;
const char *col1, *col2, *col3;
size_t line1len, line2len;
char *line1, *line2;
ssize_t n1, n2;
wchar_t *tline1, *tline2;
const char **p;
(void) setlocale(LC_ALL, "");
flag1 = flag2 = flag3 = 1;
while ((ch = getopt(argc, argv, "123i")) != -1)
switch(ch) {
case '1':
flag1 = 0;
break;
case '2':
flag2 = 0;
break;
case '3':
flag3 = 0;
break;
case 'i':
iflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 2)
usage();
fp1 = file(argv[0]);
fp2 = file(argv[1]);
/* for each column printed, add another tab offset */
p = tabs;
col1 = col2 = col3 = NULL;
if (flag1)
col1 = *p++;
if (flag2)
col2 = *p++;
if (flag3)
col3 = *p;
line1len = line2len = 0;
line1 = line2 = NULL;
n1 = n2 = -1;
for (read1 = read2 = 1;;) {
/* read next line, check for EOF */
if (read1) {
n1 = getline(&line1, &line1len, fp1);
if (n1 < 0 && ferror(fp1))
err(1, "%s", argv[0]);
if (n1 > 0 && line1[n1 - 1] == '\n')
line1[n1 - 1] = '\0';
}
if (read2) {
n2 = getline(&line2, &line2len, fp2);
if (n2 < 0 && ferror(fp2))
err(1, "%s", argv[1]);
if (n2 > 0 && line2[n2 - 1] == '\n')
line2[n2 - 1] = '\0';
}
/* if one file done, display the rest of the other file */
if (n1 < 0) {
if (n2 >= 0 && col2 != NULL)
show(fp2, argv[1], col2, &line2, &line2len);
break;
}
if (n2 < 0) {
if (n1 >= 0 && col1 != NULL)
show(fp1, argv[0], col1, &line1, &line1len);
break;
}
tline2 = NULL;
if ((tline1 = convert(line1)) != NULL)
tline2 = convert(line2);
if (tline1 == NULL || tline2 == NULL)
comp = strcmp(line1, line2);
else
comp = wcscoll(tline1, tline2);
if (tline1 != NULL)
free(tline1);
if (tline2 != NULL)
free(tline2);
/* lines are the same */
if (!comp) {
read1 = read2 = 1;
if (col3 != NULL)
(void)printf("%s%s\n", col3, line1);
continue;
}
/* lines are different */
if (comp < 0) {
read1 = 1;
read2 = 0;
if (col1 != NULL)
(void)printf("%s%s\n", col1, line1);
} else {
read1 = 0;
read2 = 1;
if (col2 != NULL)
(void)printf("%s%s\n", col2, line2);
}
}
exit(0);
}
static wchar_t *
convert(const char *str)
{
size_t n;
wchar_t *buf, *p;
if ((n = mbstowcs(NULL, str, 0)) == (size_t)-1)
return (NULL);
if (SIZE_MAX / sizeof(*buf) < n + 1)
errx(1, "conversion buffer length overflow");
if ((buf = malloc((n + 1) * sizeof(*buf))) == NULL)
err(1, "malloc");
if (mbstowcs(buf, str, n + 1) != n)
errx(1, "internal mbstowcs() error");
if (iflag) {
for (p = buf; *p != L'\0'; p++)
*p = towlower(*p);
}
return (buf);
}
static void
show(FILE *fp, const char *fn, const char *offset, char **bufp, size_t *buflenp)
{
ssize_t n;
do {
(void)printf("%s%s\n", offset, *bufp);
if ((n = getline(bufp, buflenp, fp)) < 0)
break;
if (n > 0 && (*bufp)[n - 1] == '\n')
(*bufp)[n - 1] = '\0';
} while (1);
if (ferror(fp))
err(1, "%s", fn);
}
static FILE *
file(const char *name)
{
FILE *fp;
if (!strcmp(name, "-"))
return (stdin);
if ((fp = fopen(name, "r")) == NULL) {
err(1, "%s", name);
}
return (fp);
}
static void
usage(void)
{
(void)fprintf(stderr, "usage: comm [-123i] file1 file2\n");
exit(1);
}
