NetBSD/usr.bin/unexpand/unexpand.c

165 lines
3.9 KiB
C

/* $NetBSD: unexpand.c,v 1.12 2003/08/07 11:16:54 agc 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\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: unexpand.c,v 1.12 2003/08/07 11:16:54 agc Exp $");
#endif /* not lint */
/*
* unexpand - put tabs into a file replacing blanks
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <err.h>
char genbuf[BUFSIZ];
char linebuf[BUFSIZ];
int main(int, char **);
void tabify(int, uint);
int
main(int argc, char **argv)
{
int all, c;
uint tabsize;
ulong l;
char *ep;
setprogname(argv[0]);
all = 0;
tabsize = 8;
while ((c = getopt(argc, argv, "at:")) != -1) {
switch (c) {
case 'a':
all++;
break;
case 't':
errno = 0;
l = strtoul(optarg, &ep, 0);
/*
* If every input char is a tab, the line length
* must not exceed maxuint.
*/
tabsize = (int)l * BUFSIZ;
tabsize /= BUFSIZ;
if (*ep != 0 || errno != 0 || (ulong)tabsize != l)
errx(EXIT_FAILURE, "Invalid tabstop \"%s\"",
optarg);
break;
case '?':
default:
fprintf(stderr, "usage: %s [-a] [-t tabstop] [file ...]\n",
getprogname());
exit(EXIT_FAILURE);
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
do {
if (argc > 0) {
if (freopen(argv[0], "r", stdin) == NULL) {
perror(argv[0]);
exit(EXIT_FAILURE);
}
argc--, argv++;
}
while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
tabify(all, tabsize);
printf("%s", linebuf);
}
} while (argc > 0);
exit(EXIT_SUCCESS);
/* NOTREACHED */
}
void
tabify(int all, uint tabsize)
{
char *cp, *dp;
uint dcol;
uint ocol;
uint tcol;
ocol = 0;
dcol = 0;
cp = genbuf, dp = linebuf;
for (;;) {
switch (*cp) {
case ' ':
dcol++;
break;
case '\t':
dcol = (dcol + tabsize) / tabsize * tabsize;
break;
default:
if (dcol > ocol + 1) {
tcol = (ocol + tabsize) / tabsize * tabsize;
while (tcol <= dcol) {
*dp++ = '\t';
ocol = tcol;
tcol += tabsize;
}
}
while (ocol < dcol) {
*dp++ = ' ';
ocol++;
}
if (*cp == 0 || all == 0) {
strlcpy(dp, cp,
sizeof(linebuf) - (dp - linebuf));
return;
}
*dp++ = *cp;
dcol = ++ocol;
}
cp++;
}
}