/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
#include <ctype.h>
#include <err.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
/*
* expand - expand tabs to equivalent spaces
*/
static int nstops;
static int tabstops[100];
static void getstops(char *);
static void usage(void) __dead2;
int
main(int argc, char *argv[])
{
const char *curfile;
wint_t wc;
int c, column;
int n;
int rval;
int width;
setlocale(LC_CTYPE, "");
/* 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;
rval = 0;
do {
if (argc > 0) {
if (freopen(argv[0], "r", stdin) == NULL) {
warn("%s", argv[0]);
rval = 1;
argc--, argv++;
continue;
}
curfile = argv[0];
argc--, argv++;
} else
curfile = "stdin";
column = 0;
while ((wc = getwchar()) != WEOF) {
switch (wc) {
case '\t':
if (nstops == 0) {
do {
putwchar(' ');
column++;
} while (column & 07);
continue;
}
if (nstops == 1) {
do {
putwchar(' ');
column++;
} while (((column - 1) % tabstops[0]) != (tabstops[0] - 1));
continue;
}
for (n = 0; n < nstops; n++)
if (tabstops[n] > column)
break;
if (n == nstops) {
putwchar(' ');
column++;
continue;
}
while (column < tabstops[n]) {
putwchar(' ');
column++;
}
continue;
case '\b':
if (column)
column--;
putwchar('\b');
continue;
default:
putwchar(wc);
if ((width = wcwidth(wc)) > 0)
column += width;
continue;
case '\n':
putwchar(wc);
column = 0;
continue;
}
}
if (ferror(stdin)) {
warn("%s", curfile);
rval = 1;
}
} while (argc > 0);
exit(rval);
}
static void
getstops(char *cp)
{
int i;
nstops = 0;
for (;;) {
i = 0;
while (*cp >= '0' && *cp <= '9')
i = i * 10 + *cp++ - '0';
if (i <= 0)
errx(1, "bad tab stop spec");
if (nstops > 0 && i <= tabstops[nstops-1])
errx(1, "bad tab stop spec");
if (nstops == sizeof(tabstops) / sizeof(*tabstops))
errx(1, "too many tab stops");
tabstops[nstops++] = i;
if (*cp == 0)
break;
if (*cp != ',' && !isblank((unsigned char)*cp))
errx(1, "bad tab stop spec");
cp++;
}
}
static void
usage(void)
{
(void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n");
exit(1);
}
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