NetBSD/usr.bin/fold/fold.c

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/* $NetBSD: fold.c,v 1.12 2003/08/07 11:13:48 agc Exp $ */
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/*-
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* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
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*
* This code is derived from software contributed to Berkeley by
* Kevin Ruddy.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1990, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
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#if 0
static char sccsid[] = "@(#)fold.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: fold.c,v 1.12 2003/08/07 11:13:48 agc Exp $");
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#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include <unistd.h>
#include <err.h>
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#define DEFLINEWIDTH 80
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int main(int, char **);
static void fold(int);
static int new_column_position(int, int);
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static void usage(void);
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int count_bytes = 0;
int split_words = 0;
int
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main(int argc, char **argv)
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{
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int ch;
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int width;
char *p;
width = -1;
while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1)
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switch (ch) {
case 'b':
count_bytes = 1;
break;
case 's':
split_words = 1;
break;
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case 'w':
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if ((width = atoi(optarg)) <= 0)
errx(1, "illegal width value");
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break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (width == -1) {
p = argv[optind - 1];
if (p[0] == '-' && p[1] == ch && !p[2])
width = atoi(++p);
else
width = atoi(argv[optind] + 1);
}
break;
default:
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usage();
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}
argv += optind;
argc -= optind;
if (width == -1)
width = DEFLINEWIDTH;
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if (!*argv)
fold(width);
else for (; *argv; ++argv)
if (!freopen(*argv, "r", stdin)) {
err (1, "%s", *argv);
/* NOTREACHED */
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} else
fold(width);
exit(0);
}
/*
* Fold the contents of standard input to fit within WIDTH columns
* (or bytes) and write to standard output.
*
* If split_words is set, split the line at the last space character
* on the line. This flag necessitates storing the line in a buffer
* until the current column > width, or a newline or EOF is read.
*
* The buffer can grow larger than WIDTH due to backspaces and carriage
* returns embedded in the input stream.
*/
static void
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fold(int width)
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{
static char *buf = NULL;
static int buf_max = 0;
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int ch, col;
int indx;
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col = indx = 0;
while ((ch = getchar()) != EOF) {
if (ch == '\n') {
if (indx != 0)
fwrite (buf, 1, indx, stdout);
putchar('\n');
col = indx = 0;
continue;
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}
col = new_column_position (col, ch);
if (col > width) {
int i, last_space;
#ifdef __GNUC__
last_space = 0; /* XXX gcc */
#endif
if (split_words) {
for (i = 0, last_space = -1; i < indx; i++)
if (buf[i] == ' ')
last_space = i;
}
if (split_words && last_space != -1) {
last_space++;
fwrite (buf, 1, last_space, stdout);
memmove (buf, buf+last_space, indx-last_space);
indx -= last_space;
col = 0;
for (i = 0; i < indx; i++) {
col = new_column_position (col, buf[i]);
}
} else {
fwrite (buf, 1, indx, stdout);
col = indx = 0;
}
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putchar('\n');
/* calculate the column position for the next line. */
col = new_column_position (col, ch);
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}
if (indx + 1 > buf_max) {
/* Allocate buffer in LINE_MAX increments */
buf_max += 2048;
if((buf = realloc (buf, buf_max)) == NULL) {
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err (1, "realloc");
/* NOTREACHED */
}
}
buf[indx++] = ch;
}
if (indx != 0)
fwrite (buf, 1, indx, stdout);
}
/*
* calculate the column position
*/
static int
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new_column_position (int col, int ch)
{
if (!count_bytes) {
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switch (ch) {
case '\b':
if (col > 0)
--col;
break;
case '\r':
col = 0;
break;
case '\t':
col = (col + 8) & ~7;
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break;
default:
++col;
break;
}
} else {
++col;
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}
return col;
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}
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static void
usage(void)
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{
(void)fprintf(stderr,
"usage: fold [-bs] [-w width] [file ...]\n");
exit(1);
}