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fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
228 lines
5.4 KiB
C
228 lines
5.4 KiB
C
/*-
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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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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char copyright[] =
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"@(#) 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
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#ifndef lint
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static const char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93";
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#endif
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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 <ctype.h>
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#include <err.h>
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#include <limits.h>
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#include <locale.h>
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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 <wchar.h>
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#include <wctype.h>
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static int all;
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static int nstops;
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static int tabstops[100];
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static void getstops(const char *);
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static void usage(void);
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static int tabify(const char *);
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int
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main(int argc, char *argv[])
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{
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int ch, failed;
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char *filename;
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setlocale(LC_CTYPE, "");
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nstops = 1;
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tabstops[0] = 8;
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while ((ch = getopt(argc, argv, "at:")) != -1) {
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switch (ch) {
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case 'a': /* Un-expand all spaces, not just leading. */
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all = 1;
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break;
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case 't': /* Specify tab list, implies -a. */
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getstops(optarg);
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all = 1;
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break;
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default:
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usage();
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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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failed = 0;
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if (argc == 0)
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failed |= tabify("stdin");
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else {
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while ((filename = *argv++) != NULL) {
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if (freopen(filename, "r", stdin) == NULL) {
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warn("%s", filename);
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failed = 1;
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} else
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failed |= tabify(filename);
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}
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}
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exit(failed != 0);
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: unexpand [-a | -t tablist] [file ...]\n");
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exit(1);
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}
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static int
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tabify(const char *curfile)
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{
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int dcol, doneline, limit, n, ocol, width;
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wint_t ch;
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limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1;
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doneline = ocol = dcol = 0;
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while ((ch = getwchar()) != WEOF) {
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if (ch == ' ' && !doneline) {
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if (++dcol >= limit)
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doneline = 1;
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continue;
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} else if (ch == '\t') {
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if (nstops == 1) {
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dcol = (1 + dcol / tabstops[0]) *
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tabstops[0];
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continue;
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} else {
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for (n = 0; tabstops[n] - 1 < dcol &&
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n < nstops; n++)
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;
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if (n < nstops - 1 && tabstops[n] - 1 < limit) {
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dcol = tabstops[n];
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continue;
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}
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doneline = 1;
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}
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}
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/* Output maximal number of tabs. */
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if (nstops == 1) {
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while (((ocol + tabstops[0]) / tabstops[0])
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<= (dcol / tabstops[0])) {
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if (dcol - ocol < 2)
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break;
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putwchar('\t');
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ocol = (1 + ocol / tabstops[0]) *
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tabstops[0];
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}
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} else {
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for (n = 0; tabstops[n] - 1 < ocol && n < nstops; n++)
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;
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while (ocol < dcol && n < nstops && ocol < limit) {
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putwchar('\t');
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ocol = tabstops[n++];
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}
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}
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/* Then spaces. */
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while (ocol < dcol && ocol < limit) {
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putwchar(' ');
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ocol++;
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}
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if (ch == '\b') {
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putwchar('\b');
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if (ocol > 0)
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ocol--, dcol--;
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} else if (ch == '\n') {
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putwchar('\n');
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doneline = ocol = dcol = 0;
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continue;
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} else if (ch != ' ' || dcol > limit) {
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putwchar(ch);
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if ((width = wcwidth(ch)) > 0)
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ocol += width, dcol += width;
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}
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/*
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* Only processing leading blanks or we've gone past the
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* last tab stop. Emit remainder of this line unchanged.
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*/
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if (!all || dcol >= limit) {
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while ((ch = getwchar()) != '\n' && ch != WEOF)
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putwchar(ch);
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if (ch == '\n')
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putwchar('\n');
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doneline = ocol = dcol = 0;
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}
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}
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if (ferror(stdin)) {
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warn("%s", curfile);
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return (1);
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}
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return (0);
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}
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static void
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getstops(const char *cp)
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{
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int i;
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nstops = 0;
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for (;;) {
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i = 0;
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while (*cp >= '0' && *cp <= '9')
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i = i * 10 + *cp++ - '0';
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if (i <= 0)
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errx(1, "bad tab stop spec");
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if (nstops > 0 && i <= tabstops[nstops-1])
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errx(1, "bad tab stop spec");
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if (nstops == sizeof(tabstops) / sizeof(*tabstops))
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errx(1, "too many tab stops");
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tabstops[nstops++] = i;
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if (*cp == 0)
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break;
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if (*cp != ',' && !isblank((unsigned char)*cp))
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errx(1, "bad tab stop spec");
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cp++;
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}
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}
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