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. 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
29 * @(#) Copyright (c) 1980, 1993 The Regents of the University of California. All rights reserved.
30 * @(#)unexpand.c 8.1 (Berkeley) 6/6/93
31 * $FreeBSD: src/usr.bin/unexpand/unexpand.c,v 1.5.2.3 2002/10/11 11:33:23 tjr Exp $
32 * $DragonFly: src/usr.bin/unexpand/unexpand.c,v 1.3 2003/10/04 20:36:54 hmp Exp $
36 * unexpand - put tabs into a file replacing blanks
51 static void getstops(const char *);
52 static void usage(void);
53 static void tabify(void);
56 main(int argc, char **argv)
61 setlocale(LC_CTYPE, "");
65 while ((ch = getopt(argc, argv, "at:")) != -1) {
67 case 'a': /* Un-expand all spaces, not just leading. */
70 case 't': /* Specify tab list, implies -a. */
86 while ((filename = *argv++) != NULL) {
87 if (freopen(filename, "r", stdin) == NULL) {
100 fprintf(stderr, "usage: unexpand [-a] [-t tablist] [file ...]\n");
107 int ch, dcol, doneline, limit, n, ocol;
109 limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1;
111 doneline = ocol = dcol = 0;
112 while ((ch = getchar()) != EOF) {
113 if (ch == ' ' && !doneline) {
117 } else if (ch == '\t') {
119 dcol = (1 + dcol / tabstops[0]) *
123 for (n = 0; tabstops[n] - 1 < dcol &&
126 if (n < nstops - 1 && tabstops[n] - 1 < limit) {
134 /* Output maximal number of tabs. */
136 while (((ocol + tabstops[0]) / tabstops[0])
137 <= (dcol / tabstops[0])) {
141 ocol = (1 + ocol / tabstops[0]) *
145 for (n = 0; tabstops[n] - 1 < ocol && n < nstops; n++)
147 while (ocol < dcol && n < nstops && ocol < limit) {
149 ocol = tabstops[n++];
154 while (ocol < dcol && ocol < limit) {
163 } else if (ch == '\n') {
165 doneline = ocol = dcol = 0;
167 } else if (ch != ' ' || dcol > limit) {
174 * Only processing leading blanks or we've gone past the
175 * last tab stop. Emit remainder of this line unchanged.
177 if (!all || dcol >= limit) {
178 while ((ch = getchar()) != '\n' && ch != EOF)
182 doneline = ocol = dcol = 0;
188 getstops(const char *cp)
195 while (*cp >= '0' && *cp <= '9')
196 i = i * 10 + *cp++ - '0';
198 errx(1, "bad tab stop spec");
199 if (nstops > 0 && i <= tabstops[nstops-1])
200 errx(1, "bad tab stop spec");
201 if (nstops == sizeof(tabstops) / sizeof(*tabstops))
202 errx(1, "too many tab stops");
203 tabstops[nstops++] = i;
206 if (*cp != ',' && !isblank((unsigned char)*cp))
207 errx(1, "bad tab stop spec");