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/* $OpenBSD: colrm.c,v 1.10 2015/10/05 13:30:30 deraadt Exp $ */
/* $NetBSD: colrm.c,v 1.4 1995/09/02 05:51:37 jtc Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
*/
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define TAB 8
void check(FILE *);
void usage(void);
int
main(int argc, char *argv[])
{
u_long column, start, stop;
int ch;
char *p;
if (tame("stdio", NULL) == -1)
err(1, "tame");
while ((ch = getopt(argc, argv, "")) != -1)
switch(ch) {
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
start = stop = 0;
switch(argc) {
case 2:
stop = strtol(argv[1], &p, 10);
if (stop <= 0 || *p)
errx(1, "illegal column -- %s", argv[1]);
/* FALLTHROUGH */
case 1:
start = strtol(argv[0], &p, 10);
if (start <= 0 || *p)
errx(1, "illegal column -- %s", argv[0]);
break;
case 0:
break;
default:
usage();
}
if (stop && start > stop)
err(1, "illegal start and stop columns");
for (column = 0;;) {
switch (ch = getchar()) {
case EOF:
check(stdin);
break;
case '\b':
if (column)
--column;
break;
case '\n':
column = 0;
break;
case '\t':
column = (column + TAB) & ~(TAB - 1);
break;
default:
++column;
break;
}
if ((!start || column < start || (stop && column > stop)) &&
putchar(ch) == EOF)
check(stdout);
}
}
void
check(FILE *stream)
{
if (feof(stream))
exit(0);
if (ferror(stream))
err(1, "%s", stream == stdin ? "stdin" : "stdout");
}
void
usage(void)
{
(void)fprintf(stderr, "usage: colrm [start [stop]]\n");
exit(1);
}
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