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
36 * @(#) Copyright (c) 1990, 1993 The Regents of the University of California. All rights reserved.
37 * @(#)fold.c 8.1 (Berkeley) 6/6/93
38 * $FreeBSD: src/usr.bin/fold/fold.c,v 1.4.2.3 2002/07/11 01:01:44 tjr Exp $
39 * $DragonFly: src/usr.bin/fold/fold.c,v 1.5 2006/08/13 02:15:07 swildner Exp $
51 #define DEFLINEWIDTH 80
54 static int newpos(int, int);
55 static void usage(void);
57 int bflag; /* Count bytes, not columns */
58 int sflag; /* Split on word boundaries */
61 main(int argc, char **argv)
67 (void) setlocale(LC_CTYPE, "");
70 while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1)
79 if ((width = atoi(optarg)) <= 0) {
80 errx(1, "illegal width value");
83 case '0': case '1': case '2': case '3': case '4':
84 case '5': case '6': case '7': case '8': case '9':
87 if (p[0] == '-' && p[1] == ch && !p[2])
90 width = atoi(argv[optind] + 1);
100 width = DEFLINEWIDTH;
104 else for (; *argv; ++argv)
105 if (!freopen(*argv, "r", stdin)) {
116 (void)fprintf(stderr, "usage: fold [-bs] [-w width] [file ...]\n");
121 * Fold the contents of standard input to fit within WIDTH columns (or bytes)
122 * and write to standard output.
124 * If sflag is set, split the line at the last space character on the line.
125 * This flag necessitates storing the line in a buffer until the current
126 * column > width, or a newline or EOF is read.
128 * The buffer can grow larger than WIDTH due to backspaces and carriage
129 * returns embedded in the input stream.
136 int ch, col, i, indx, space;
138 col = indx = space = 0;
139 while ((ch = getchar()) != EOF) {
142 fwrite(buf, 1, indx, stdout);
147 if ((col = newpos(col, ch)) > width) {
150 while (--i >= 0 && !isblank((unsigned char)buf[i]))
154 if (sflag && space != -1) {
156 fwrite(buf, 1, space, stdout);
157 memmove(buf, buf + space, indx - space);
160 for (i = 0; i < indx; i++)
162 (unsigned char)buf[i]);
164 fwrite(buf, 1, indx, stdout);
168 col = newpos(col, ch);
170 if (indx + 1 > buf_max) {
172 if ((buf = realloc(buf, buf_max)) == NULL)
179 fwrite(buf, 1, indx, stdout);
183 * Update the current column position for a character.
186 newpos(int col, int ch)
201 col = (col + 8) & ~7;