2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 static const char copyright[] =
40 "@(#) Copyright (c) 1980, 1993\n\
41 The Regents of the University of California. All rights reserved.\n";
45 static const char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93";
49 * unexpand - put tabs into a file replacing blanks
66 static void getstops(const char *);
67 static void usage(void);
68 static int tabify(const char *);
71 main(int argc, char *argv[])
76 setlocale(LC_CTYPE, "");
80 while ((ch = getopt(argc, argv, "at:")) != -1) {
82 case 'a': /* Un-expand all spaces, not just leading. */
85 case 't': /* Specify tab list, implies -a. */
99 failed |= tabify("stdin");
101 while ((filename = *argv++) != NULL) {
102 if (freopen(filename, "r", stdin) == NULL) {
103 warn("%s", filename);
106 failed |= tabify(filename);
115 fprintf(stderr, "usage: unexpand [-a | -t tablist] [file ...]\n");
120 tabify(const char *curfile)
122 int dcol, doneline, limit, n, ocol, width;
125 limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1;
127 doneline = ocol = dcol = 0;
128 while ((ch = getwchar()) != WEOF) {
129 if (ch == ' ' && !doneline) {
133 } else if (ch == '\t') {
135 dcol = (1 + dcol / tabstops[0]) *
139 for (n = 0; tabstops[n] - 1 < dcol &&
142 if (n < nstops - 1 && tabstops[n] - 1 < limit) {
150 /* Output maximal number of tabs. */
152 while (((ocol + tabstops[0]) / tabstops[0])
153 <= (dcol / tabstops[0])) {
157 ocol = (1 + ocol / tabstops[0]) *
161 for (n = 0; tabstops[n] - 1 < ocol && n < nstops; n++)
163 while (ocol < dcol && n < nstops && ocol < limit) {
165 ocol = tabstops[n++];
170 while (ocol < dcol && ocol < limit) {
179 } else if (ch == '\n') {
181 doneline = ocol = dcol = 0;
183 } else if (ch != ' ' || dcol > limit) {
185 if ((width = wcwidth(ch)) > 0)
186 ocol += width, dcol += width;
190 * Only processing leading blanks or we've gone past the
191 * last tab stop. Emit remainder of this line unchanged.
193 if (!all || dcol >= limit) {
194 while ((ch = getwchar()) != '\n' && ch != WEOF)
198 doneline = ocol = dcol = 0;
209 getstops(const char *cp)
216 while (*cp >= '0' && *cp <= '9')
217 i = i * 10 + *cp++ - '0';
219 errx(1, "bad tab stop spec");
220 if (nstops > 0 && i <= tabstops[nstops-1])
221 errx(1, "bad tab stop spec");
222 if (nstops == sizeof(tabstops) / sizeof(*tabstops))
223 errx(1, "too many tab stops");
224 tabstops[nstops++] = i;
227 if (*cp != ',' && !isblank((unsigned char)*cp))
228 errx(1, "bad tab stop spec");