165 lines
3.9 KiB
C
165 lines
3.9 KiB
C
/* $NetBSD: unexpand.c,v 1.12 2003/08/07 11:16:54 agc Exp $ */
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/*-
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: unexpand.c,v 1.12 2003/08/07 11:16:54 agc Exp $");
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#endif /* not lint */
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/*
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* unexpand - put tabs into a file replacing blanks
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <err.h>
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char genbuf[BUFSIZ];
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char linebuf[BUFSIZ];
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int main(int, char **);
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void tabify(int, uint);
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int
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main(int argc, char **argv)
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{
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int all, c;
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uint tabsize;
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ulong l;
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char *ep;
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setprogname(argv[0]);
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all = 0;
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tabsize = 8;
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while ((c = getopt(argc, argv, "at:")) != -1) {
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switch (c) {
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case 'a':
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all++;
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break;
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case 't':
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errno = 0;
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l = strtoul(optarg, &ep, 0);
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/*
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* If every input char is a tab, the line length
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* must not exceed maxuint.
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*/
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tabsize = (int)l * BUFSIZ;
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tabsize /= BUFSIZ;
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if (*ep != 0 || errno != 0 || (ulong)tabsize != l)
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errx(EXIT_FAILURE, "Invalid tabstop \"%s\"",
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optarg);
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break;
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case '?':
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default:
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fprintf(stderr, "usage: %s [-a] [-t tabstop] [file ...]\n",
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getprogname());
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exit(EXIT_FAILURE);
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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do {
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if (argc > 0) {
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if (freopen(argv[0], "r", stdin) == NULL) {
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perror(argv[0]);
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exit(EXIT_FAILURE);
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}
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argc--, argv++;
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}
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while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
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tabify(all, tabsize);
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printf("%s", linebuf);
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}
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} while (argc > 0);
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exit(EXIT_SUCCESS);
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/* NOTREACHED */
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}
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void
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tabify(int all, uint tabsize)
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{
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char *cp, *dp;
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uint dcol;
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uint ocol;
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uint tcol;
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ocol = 0;
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dcol = 0;
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cp = genbuf, dp = linebuf;
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for (;;) {
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switch (*cp) {
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case ' ':
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dcol++;
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break;
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case '\t':
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dcol = (dcol + tabsize) / tabsize * tabsize;
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break;
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default:
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if (dcol > ocol + 1) {
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tcol = (ocol + tabsize) / tabsize * tabsize;
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while (tcol <= dcol) {
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*dp++ = '\t';
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ocol = tcol;
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tcol += tabsize;
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}
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}
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while (ocol < dcol) {
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*dp++ = ' ';
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ocol++;
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}
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if (*cp == 0 || all == 0) {
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strlcpy(dp, cp,
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sizeof(linebuf) - (dp - linebuf));
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return;
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}
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*dp++ = *cp;
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dcol = ++ocol;
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}
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cp++;
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}
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}
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