NetBSD/usr.bin/expand/expand.c

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/* $NetBSD: expand.c,v 1.9 2003/08/07 11:13:39 agc Exp $ */
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/*
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* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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
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* 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.
*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
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#if 0
static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93";
#endif
__RCSID("$NetBSD: expand.c,v 1.9 2003/08/07 11:13:39 agc Exp $");
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#endif /* not lint */
#include <stdio.h>
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#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
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/*
* expand - expand tabs to equivalent spaces
*/
int nstops;
int tabstops[100];
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static void getstops __P((char *));
int main __P((int, char **));
static void usage __P((void));
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int
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main(argc, argv)
int argc;
char *argv[];
{
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int c, column;
int n;
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/* handle obsolete syntax */
while (argc > 1 &&
argv[1][0] == '-' && isdigit((unsigned char)argv[1][1])) {
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getstops(&argv[1][1]);
argc--; argv++;
}
while ((c = getopt (argc, argv, "t:")) != -1) {
switch (c) {
case 't':
getstops(optarg);
break;
case '?':
default:
usage();
/* NOTREACHED */
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}
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}
argc -= optind;
argv += optind;
do {
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if (argc > 0) {
if (freopen(argv[0], "r", stdin) == NULL) {
perror(argv[0]);
exit(EXIT_FAILURE);
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}
argc--, argv++;
}
column = 0;
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while ((c = getchar()) != EOF) {
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switch (c) {
case '\t':
if (nstops == 0) {
do {
putchar(' ');
column++;
} while (column & 07);
continue;
}
if (nstops == 1) {
do {
putchar(' ');
column++;
} while (((column - 1) % tabstops[0]) != (tabstops[0] - 1));
continue;
}
for (n = 0; n < nstops; n++)
if (tabstops[n] > column)
break;
if (n == nstops) {
putchar(' ');
column++;
continue;
}
while (column < tabstops[n]) {
putchar(' ');
column++;
}
continue;
case '\b':
if (column)
column--;
putchar('\b');
continue;
default:
putchar(c);
column++;
continue;
case '\n':
putchar(c);
column = 0;
continue;
}
}
} while (argc > 0);
exit(EXIT_SUCCESS);
/* NOTREACHED */
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}
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static void
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getstops(cp)
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char *cp;
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{
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int i;
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nstops = 0;
for (;;) {
i = 0;
while (*cp >= '0' && *cp <= '9')
i = i * 10 + *cp++ - '0';
if (i <= 0 || i > 256) {
bad:
fprintf(stderr, "Bad tab stop spec\n");
exit(EXIT_FAILURE);
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}
if (nstops > 0 && i <= tabstops[nstops-1])
goto bad;
tabstops[nstops++] = i;
if (*cp == 0)
break;
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if (*cp != ',' && *cp != ' ')
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goto bad;
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cp++;
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}
}
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static void
usage()
{
(void)fprintf(stderr, "usage: expand [-t tablist] [file ...]\n");
exit(EXIT_FAILURE);
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}