freebsd-dev/usr.bin/comm/comm.c
Warner Losh fbbd9655e5 Renumber copyright clause 4
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

249 lines
5.7 KiB
C

/*
* 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.
* 3. 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>
#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);
}