NetBSD/usr.bin/expand/expand.c

183 lines
4.4 KiB
C

/* $NetBSD: expand.c,v 1.14 2016/09/05 00:40:28 sevan Exp $ */
/*
* Copyright (c) 1980, 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/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93";
#endif
__RCSID("$NetBSD: expand.c,v 1.14 2016/09/05 00:40:28 sevan Exp $");
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include <err.h>
/*
* expand - expand tabs to equivalent spaces
*/
size_t nstops;
size_t tabstops[100];
static void getstops(const char *);
static void usage(void) __dead;
int
main(int argc, char *argv[])
{
int c;
size_t n, column;
setprogname(argv[0]);
/* handle obsolete syntax */
while (argc > 1 &&
argv[1][0] == '-' && isdigit((unsigned char)argv[1][1])) {
getstops(&argv[1][1]);
argc--; argv++;
}
while ((c = getopt (argc, argv, "t:")) != -1) {
switch (c) {
case 't':
getstops(optarg);
break;
case '?':
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
do {
if (argc > 0) {
if (freopen(argv[0], "r", stdin) == NULL)
err(EXIT_FAILURE, "Cannot open `%s'", argv[0]);
argc--, argv++;
}
column = 0;
while ((c = getchar()) != EOF) {
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);
return EXIT_SUCCESS;
}
static void
getstops(const char *spec)
{
int i;
const char *cp = spec;
nstops = 0;
for (;;) {
i = 0;
while (*cp >= '0' && *cp <= '9')
i = i * 10 + *cp++ - '0';
if (i <= 0 || i > 256)
errx(EXIT_FAILURE, "Too large tab stop spec `%d'", i);
if (nstops > 0 && (size_t)i <= tabstops[nstops-1])
errx(EXIT_FAILURE, "Out of order tabstop spec `%d'", i);
if (nstops == sizeof(tabstops) / sizeof(tabstops[0]) - 1)
errx(EXIT_FAILURE, "Too many tabstops");
tabstops[nstops++] = i;
if (*cp == '\0')
break;
if (*cp != ',' && *cp != ' ')
errx(EXIT_FAILURE, "Illegal tab stop spec `%s'", spec);
cp++;
}
}
static void
usage(void)
{
(void)fprintf(stderr, "Usage: %s [-t tablist] [file ...]\n",
getprogname());
exit(EXIT_FAILURE);
}