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. 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
32 * @(#) Copyright (c) 1990, 1993 The Regents of the University of California. All rights reserved.
33 * @(#)fold.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: head/usr.bin/fold/fold.c 227165 2011-11-06 08:15:23Z ed $
47 #define DEFLINEWIDTH 80
50 static int newpos(int, wint_t);
51 static void usage(void);
53 static int bflag; /* Count bytes, not columns */
54 static int sflag; /* Split on word boundaries */
57 main(int argc, char **argv)
62 (void) setlocale(LC_CTYPE, "");
66 while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1) {
75 if ((width = atoi(optarg)) <= 0) {
76 errx(1, "illegal width value");
79 case '0': case '1': case '2': case '3': case '4':
80 case '5': case '6': case '7': case '8': case '9':
81 /* Accept a width as eg. -30. Note that a width
82 * specified using the -w option is always used prior
83 * to this undocumented option. */
84 switch (previous_ch) {
85 case '0': case '1': case '2': case '3': case '4':
86 case '5': case '6': case '7': case '8': case '9':
87 /* The width is a number with multiple digits:
88 * add the last one. */
89 width = width * 10 + (ch - '0');
92 /* Set the width, unless it was previously
93 * set. For instance, the following options
94 * would all give a width of 5 and not 10:
112 width = DEFLINEWIDTH;
116 else for (; *argv; ++argv)
117 if (!freopen(*argv, "r", stdin)) {
128 (void)fprintf(stderr, "usage: fold [-bs] [-w width] [file ...]\n");
133 * Fold the contents of standard input to fit within WIDTH columns (or bytes)
134 * and write to standard output.
136 * If sflag is set, split the line at the last space character on the line.
137 * This flag necessitates storing the line in a buffer until the current
138 * column > width, or a newline or EOF is read.
140 * The buffer can grow larger than WIDTH due to backspaces and carriage
141 * returns embedded in the input stream.
148 int col, i, indx, space;
152 while ((ch = getwchar()) != WEOF) {
154 wprintf(L"%.*ls\n", indx, buf);
158 if ((col = newpos(col, ch)) > width) {
161 while (--i >= 0 && !iswblank(buf[i]))
165 if (sflag && space != -1) {
167 wprintf(L"%.*ls\n", space, buf);
168 wmemmove(buf, buf + space, indx - space);
171 for (i = 0; i < indx; i++)
172 col = newpos(col, buf[i]);
174 wprintf(L"%.*ls\n", indx, buf);
177 col = newpos(col, ch);
179 if (indx + 1 > buf_max) {
181 buf = realloc(buf, sizeof(*buf) * buf_max);
189 wprintf(L"%.*ls", indx, buf);
193 * Update the current column position for a character.
196 newpos(int col, wint_t ch)
198 char buf[MB_LEN_MAX];
203 len = wcrtomb(buf, ch, NULL);
215 col = (col + 8) & ~7;
218 if ((w = wcwidth(ch)) > 0)