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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 static const char copyright[] =
39 "@(#) Copyright (c) 1990, 1993\n\
40 The Regents of the University of California. All rights reserved.\n";
45 static char sccsid[] = "@(#)fold.c 8.1 (Berkeley) 6/6/93";
49 #include <sys/cdefs.h>
50 __FBSDID("$FreeBSD$");
62 #define DEFLINEWIDTH 80
65 static int newpos(int, wint_t);
66 static void usage(void);
68 int bflag; /* Count bytes, not columns */
69 int sflag; /* Split on word boundaries */
72 main(int argc, char **argv)
78 (void) setlocale(LC_CTYPE, "");
81 while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1)
90 if ((width = atoi(optarg)) <= 0) {
91 errx(1, "illegal width value");
94 case '0': case '1': case '2': case '3': case '4':
95 case '5': case '6': case '7': case '8': case '9':
98 if (p[0] == '-' && p[1] == ch && !p[2])
101 width = atoi(argv[optind] + 1);
111 width = DEFLINEWIDTH;
115 else for (; *argv; ++argv)
116 if (!freopen(*argv, "r", stdin)) {
127 (void)fprintf(stderr, "usage: fold [-bs] [-w width] [file ...]\n");
132 * Fold the contents of standard input to fit within WIDTH columns (or bytes)
133 * and write to standard output.
135 * If sflag is set, split the line at the last space character on the line.
136 * This flag necessitates storing the line in a buffer until the current
137 * column > width, or a newline or EOF is read.
139 * The buffer can grow larger than WIDTH due to backspaces and carriage
140 * returns embedded in the input stream.
147 int col, i, indx, space;
151 while ((ch = getwchar()) != WEOF) {
153 wprintf(L"%.*ls\n", indx, buf);
157 if ((col = newpos(col, ch)) > width) {
160 while (--i >= 0 && !iswblank(buf[i]))
164 if (sflag && space != -1) {
166 wprintf(L"%.*ls\n", space, buf);
167 wmemmove(buf, buf + space, indx - space);
170 for (i = 0; i < indx; i++)
171 col = newpos(col, buf[i]);
173 wprintf(L"%.*ls\n", indx, buf);
176 col = newpos(col, ch);
178 if (indx + 1 > buf_max) {
180 buf = realloc(buf, sizeof(*buf) * buf_max);
188 wprintf(L"%.*ls", indx, buf);
192 * Update the current column position for a character.
195 newpos(int col, wint_t ch)
197 char buf[MB_LEN_MAX];
202 len = wcrtomb(buf, ch, NULL);
214 col = (col + 8) & ~7;
217 if ((w = wcwidth(ch)) > 0)