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mirror of https://git.FreeBSD.org/src.git synced 2024-12-25 11:37:56 +00:00
freebsd/usr.bin/comm/comm.c
Guy Helmer 16f53ec4b7 Similar to changes previously made to src/usr.bin/uniq/uniq.c,
fix truncation of lines at LINE_MAX characters by dynamically
extending line buffers.
2008-05-28 14:13:35 +00:00

289 lines
6.9 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#define MAXLINELEN (LINE_MAX + 1)
const wchar_t *tabs[] = { L"", L"\t", L"\t\t" };
FILE *file(const char *);
wchar_t *getline(wchar_t *, size_t *, FILE *);
void show(FILE *, const char *, const wchar_t *, wchar_t *, size_t *);
int wcsicoll(const wchar_t *, const wchar_t *);
static void usage(void);
int
main(int argc, char *argv[])
{
int comp, read1, read2;
int ch, flag1, flag2, flag3, iflag;
FILE *fp1, *fp2;
const wchar_t *col1, *col2, *col3;
size_t line1len, line2len;
wchar_t *line1, *line2;
const wchar_t **p;
flag1 = flag2 = flag3 = 1;
iflag = 0;
line1len = MAXLINELEN;
line2len = MAXLINELEN;
line1 = malloc(line1len * sizeof(*line1));
line2 = malloc(line2len * sizeof(*line2));
if (line1 == NULL || line2 == NULL)
err(1, "malloc");
(void) setlocale(LC_ALL, "");
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;
for (read1 = read2 = 1;;) {
/* read next line, check for EOF */
if (read1) {
line1 = getline(line1, &line1len, fp1);
if (line1 == NULL && ferror(fp1))
err(1, "%s", argv[0]);
}
if (read2) {
line2 = getline(line2, &line2len, fp2);
if (line2 == NULL && ferror(fp2))
err(1, "%s", argv[1]);
}
/* if one file done, display the rest of the other file */
if (line1 == NULL) {
if (line2 != NULL && col2 != NULL)
show(fp2, argv[1], col2, line2, &line2len);
break;
}
if (line2 == NULL) {
if (line1 != NULL && col1 != NULL)
show(fp1, argv[0], col1, line1, &line1len);
break;
}
/* lines are the same */
if(iflag)
comp = wcsicoll(line1, line2);
else
comp = wcscoll(line1, line2);
if (!comp) {
read1 = read2 = 1;
if (col3 != NULL)
(void)printf("%ls%ls", col3, line1);
continue;
}
/* lines are different */
if (comp < 0) {
read1 = 1;
read2 = 0;
if (col1 != NULL)
(void)printf("%ls%ls", col1, line1);
} else {
read1 = 0;
read2 = 1;
if (col2 != NULL)
(void)printf("%ls%ls", col2, line2);
}
}
exit(0);
}
wchar_t *
getline(wchar_t *buf, size_t *buflen, FILE *fp)
{
size_t bufpos;
wint_t ch;
bufpos = 0;
do {
if ((ch = getwc(fp)) != WEOF) {
if (bufpos + 2 >= *buflen) {
*buflen = *buflen * 2;
buf = reallocf(buf, *buflen * sizeof(*buf));
if (buf == NULL)
return (NULL);
}
buf[bufpos++] = ch;
}
} while (ch != WEOF && ch != '\n');
if (bufpos + 1 != *buflen)
buf[bufpos] = '\0';
return (bufpos != 0 || ch == '\n' ? buf : NULL);
}
void
show(FILE *fp, const char *fn, const wchar_t *offset, wchar_t *buf, size_t *buflen)
{
do {
(void)printf("%ls%ls", offset, buf);
} while ((buf = getline(buf, buflen, fp)) != NULL);
if (ferror(fp))
err(1, "%s", fn);
}
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);
}
static size_t wcsicoll_l1_buflen = 0, wcsicoll_l2_buflen = 0;
static wchar_t *wcsicoll_l1_buf = NULL, *wcsicoll_l2_buf = NULL;
int
wcsicoll(const wchar_t *s1, const wchar_t *s2)
{
wchar_t *p;
size_t l1, l2;
size_t new_l1_buflen, new_l2_buflen;
l1 = wcslen(s1) + 1;
l2 = wcslen(s2) + 1;
new_l1_buflen = wcsicoll_l1_buflen;
new_l2_buflen = wcsicoll_l2_buflen;
while (new_l1_buflen < l1) {
if (new_l1_buflen == 0)
new_l1_buflen = MAXLINELEN;
else
new_l1_buflen *= 2;
}
while (new_l2_buflen < l2) {
if (new_l2_buflen == 0)
new_l2_buflen = MAXLINELEN;
else
new_l2_buflen *= 2;
}
if (new_l1_buflen > wcsicoll_l1_buflen) {
wcsicoll_l1_buf = reallocf(wcsicoll_l1_buf, new_l1_buflen * sizeof(*wcsicoll_l1_buf));
if (wcsicoll_l1_buf == NULL)
err(1, "reallocf");
wcsicoll_l1_buflen = new_l1_buflen;
}
if (new_l2_buflen > wcsicoll_l2_buflen) {
wcsicoll_l2_buf = reallocf(wcsicoll_l2_buf, new_l2_buflen * sizeof(*wcsicoll_l2_buf));
if (wcsicoll_l2_buf == NULL)
err(1, "reallocf");
wcsicoll_l2_buflen = new_l2_buflen;
}
for (p = wcsicoll_l1_buf; *s1; s1++)
*p++ = towlower(*s1);
*p = '\0';
for (p = wcsicoll_l2_buf; *s2; s2++)
*p++ = towlower(*s2);
*p = '\0';
return (wcscoll(wcsicoll_l1_buf, wcsicoll_l2_buf));
}