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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
35 static const char copyright[] =
36 "@(#) Copyright (c) 1980, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
41 static const char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93";
45 * unexpand - put tabs into a file replacing blanks
60 static int tabstops[100];
62 static void getstops(const char *);
63 static void usage(void);
64 static int tabify(const char *);
67 main(int argc, char *argv[])
72 setlocale(LC_CTYPE, "");
76 while ((ch = getopt(argc, argv, "at:")) != -1) {
78 case 'a': /* Un-expand all spaces, not just leading. */
81 case 't': /* Specify tab list, implies -a. */
95 failed |= tabify("stdin");
97 while ((filename = *argv++) != NULL) {
98 if (freopen(filename, "r", stdin) == NULL) {
102 failed |= tabify(filename);
111 fprintf(stderr, "usage: unexpand [-a | -t tablist] [file ...]\n");
116 tabify(const char *curfile)
118 int dcol, doneline, limit, n, ocol, width;
121 limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1;
123 doneline = ocol = dcol = 0;
124 while ((ch = getwchar()) != WEOF) {
125 if (ch == ' ' && !doneline) {
129 } else if (ch == '\t') {
131 dcol = (1 + dcol / tabstops[0]) *
135 for (n = 0; tabstops[n] - 1 < dcol &&
138 if (n < nstops - 1 && tabstops[n] - 1 < limit) {
146 /* Output maximal number of tabs. */
148 while (((ocol + tabstops[0]) / tabstops[0])
149 <= (dcol / tabstops[0])) {
153 ocol = (1 + ocol / tabstops[0]) *
157 for (n = 0; tabstops[n] - 1 < ocol && n < nstops; n++)
159 while (ocol < dcol && n < nstops && ocol < limit) {
161 ocol = tabstops[n++];
166 while (ocol < dcol && ocol < limit) {
175 } else if (ch == '\n') {
177 doneline = ocol = dcol = 0;
179 } else if (ch != ' ' || dcol > limit) {
181 if ((width = wcwidth(ch)) > 0)
182 ocol += width, dcol += width;
186 * Only processing leading blanks or we've gone past the
187 * last tab stop. Emit remainder of this line unchanged.
189 if (!all || dcol >= limit) {
190 while ((ch = getwchar()) != '\n' && ch != WEOF)
194 doneline = ocol = dcol = 0;
205 getstops(const char *cp)
212 while (*cp >= '0' && *cp <= '9')
213 i = i * 10 + *cp++ - '0';
215 errx(1, "bad tab stop spec");
216 if (nstops > 0 && i <= tabstops[nstops-1])
217 errx(1, "bad tab stop spec");
218 if (nstops == sizeof(tabstops) / sizeof(*tabstops))
219 errx(1, "too many tab stops");
220 tabstops[nstops++] = i;
223 if (*cp != ',' && !isblank((unsigned char)*cp))
224 errx(1, "bad tab stop spec");