2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 static const char copyright[] =
35 "@(#) Copyright (c) 1990, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
41 static char sccsid[] = "@(#)fold.c 8.1 (Berkeley) 6/6/93";
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
58 #define DEFLINEWIDTH 80
61 static int newpos(int, wint_t);
62 static void usage(void);
64 static int bflag; /* Count bytes, not columns */
65 static int sflag; /* Split on word boundaries */
68 main(int argc, char **argv)
73 (void) setlocale(LC_CTYPE, "");
77 while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1) {
86 if ((width = atoi(optarg)) <= 0) {
87 errx(1, "illegal width value");
90 case '0': case '1': case '2': case '3': case '4':
91 case '5': case '6': case '7': case '8': case '9':
92 /* Accept a width as eg. -30. Note that a width
93 * specified using the -w option is always used prior
94 * to this undocumented option. */
95 switch (previous_ch) {
96 case '0': case '1': case '2': case '3': case '4':
97 case '5': case '6': case '7': case '8': case '9':
98 /* The width is a number with multiple digits:
99 * add the last one. */
100 width = width * 10 + (ch - '0');
103 /* Set the width, unless it was previously
104 * set. For instance, the following options
105 * would all give a width of 5 and not 10:
123 width = DEFLINEWIDTH;
127 else for (; *argv; ++argv)
128 if (!freopen(*argv, "r", stdin)) {
139 (void)fprintf(stderr, "usage: fold [-bs] [-w width] [file ...]\n");
144 * Fold the contents of standard input to fit within WIDTH columns (or bytes)
145 * and write to standard output.
147 * If sflag is set, split the line at the last space character on the line.
148 * This flag necessitates storing the line in a buffer until the current
149 * column > width, or a newline or EOF is read.
151 * The buffer can grow larger than WIDTH due to backspaces and carriage
152 * returns embedded in the input stream.
159 int col, i, indx, space;
163 while ((ch = getwchar()) != WEOF) {
165 wprintf(L"%.*ls\n", indx, buf);
169 if ((col = newpos(col, ch)) > width) {
172 while (--i >= 0 && !iswblank(buf[i]))
176 if (sflag && space != -1) {
178 wprintf(L"%.*ls\n", space, buf);
179 wmemmove(buf, buf + space, indx - space);
182 for (i = 0; i < indx; i++)
183 col = newpos(col, buf[i]);
185 wprintf(L"%.*ls\n", indx, buf);
188 col = newpos(col, ch);
190 if (indx + 1 > buf_max) {
192 buf = realloc(buf, sizeof(*buf) * buf_max);
200 wprintf(L"%.*ls", indx, buf);
204 * Update the current column position for a character.
207 newpos(int col, wint_t ch)
209 char buf[MB_LEN_MAX];
214 len = wcrtomb(buf, ch, NULL);
226 col = (col + 8) & ~7;
229 if ((w = wcwidth(ch)) > 0)