2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 static const char copyright[] =
38 "@(#) Copyright (c) 1980, 1993\n\
39 The Regents of the University of California. All rights reserved.\n";
43 static const char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93";
47 * unexpand - put tabs into a file replacing blanks
62 static int tabstops[100];
64 static void getstops(const char *);
65 static void usage(void);
66 static int tabify(const char *);
69 main(int argc, char *argv[])
74 setlocale(LC_CTYPE, "");
78 while ((ch = getopt(argc, argv, "at:")) != -1) {
80 case 'a': /* Un-expand all spaces, not just leading. */
83 case 't': /* Specify tab list, implies -a. */
97 failed |= tabify("stdin");
99 while ((filename = *argv++) != NULL) {
100 if (freopen(filename, "r", stdin) == NULL) {
101 warn("%s", filename);
104 failed |= tabify(filename);
113 fprintf(stderr, "usage: unexpand [-a | -t tablist] [file ...]\n");
118 tabify(const char *curfile)
120 int dcol, doneline, limit, n, ocol, width;
123 limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1;
125 doneline = ocol = dcol = 0;
126 while ((ch = getwchar()) != WEOF) {
127 if (ch == ' ' && !doneline) {
131 } else if (ch == '\t') {
133 dcol = (1 + dcol / tabstops[0]) *
137 for (n = 0; n < nstops &&
138 tabstops[n] - 1 < dcol; n++)
140 if (n < nstops - 1 && tabstops[n] - 1 < limit) {
148 /* Output maximal number of tabs. */
150 while (((ocol + tabstops[0]) / tabstops[0])
151 <= (dcol / tabstops[0])) {
155 ocol = (1 + ocol / tabstops[0]) *
159 for (n = 0; n < nstops && tabstops[n] - 1 < ocol; n++)
161 while (ocol < dcol && n < nstops && ocol < limit) {
163 ocol = tabstops[n++];
168 while (ocol < dcol && ocol < limit) {
177 } else if (ch == '\n') {
179 doneline = ocol = dcol = 0;
181 } else if (ch != ' ' || dcol > limit) {
183 if ((width = wcwidth(ch)) > 0)
184 ocol += width, dcol += width;
188 * Only processing leading blanks or we've gone past the
189 * last tab stop. Emit remainder of this line unchanged.
191 if (!all || dcol >= limit) {
192 while ((ch = getwchar()) != '\n' && ch != WEOF)
196 doneline = ocol = dcol = 0;
207 getstops(const char *cp)
214 while (*cp >= '0' && *cp <= '9')
215 i = i * 10 + *cp++ - '0';
217 errx(1, "bad tab stop spec");
218 if (nstops > 0 && i <= tabstops[nstops-1])
219 errx(1, "bad tab stop spec");
220 if (nstops == sizeof(tabstops) / sizeof(*tabstops))
221 errx(1, "too many tab stops");
222 tabstops[nstops++] = i;
225 if (*cp != ',' && !isblank((unsigned char)*cp))
226 errx(1, "bad tab stop spec");