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![Warner Losh](/assets/img/avatar_default.png)
We've ifdef'd out the copyright strings for some time now. Go ahead and remove the ifdefs. Plus whatever other detritis was left over from other recent removals. These copyright strings are present in the comments and are largely from CSRG's attempt at adding their copyright to every binary file (which modern interpretations of the license doesn't require). Sponsored by: Netflix
223 lines
5.4 KiB
C
223 lines
5.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kevin Ruddy.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <err.h>
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#include <limits.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <wctype.h>
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#define DEFLINEWIDTH 80
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void fold(int);
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static int newpos(int, wint_t);
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static void usage(void) __dead2;
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static int bflag; /* Count bytes, not columns */
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static int sflag; /* Split on word boundaries */
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int
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main(int argc, char **argv)
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{
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int ch, previous_ch;
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int rval, width;
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(void) setlocale(LC_CTYPE, "");
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width = -1;
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previous_ch = 0;
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while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1) {
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switch (ch) {
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case 'b':
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bflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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case 'w':
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if ((width = atoi(optarg)) <= 0) {
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errx(1, "illegal width value");
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}
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break;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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/* Accept a width as eg. -30. Note that a width
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* specified using the -w option is always used prior
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* to this undocumented option. */
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switch (previous_ch) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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/* The width is a number with multiple digits:
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* add the last one. */
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width = width * 10 + (ch - '0');
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break;
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default:
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/* Set the width, unless it was previously
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* set. For instance, the following options
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* would all give a width of 5 and not 10:
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* -10 -w5
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* -5b10
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* -5 -10b */
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if (width == -1)
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width = ch - '0';
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break;
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}
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break;
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default:
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usage();
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}
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previous_ch = ch;
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}
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argv += optind;
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argc -= optind;
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if (width == -1)
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width = DEFLINEWIDTH;
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rval = 0;
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if (!*argv)
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fold(width);
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else for (; *argv; ++argv)
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if (!freopen(*argv, "r", stdin)) {
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warn("%s", *argv);
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rval = 1;
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} else
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fold(width);
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exit(rval);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: fold [-bs] [-w width] [file ...]\n");
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exit(1);
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}
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/*
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* Fold the contents of standard input to fit within WIDTH columns (or bytes)
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* and write to standard output.
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*
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* If sflag is set, split the line at the last space character on the line.
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* This flag necessitates storing the line in a buffer until the current
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* column > width, or a newline or EOF is read.
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*
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* The buffer can grow larger than WIDTH due to backspaces and carriage
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* returns embedded in the input stream.
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*/
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void
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fold(int width)
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{
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static wchar_t *buf;
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static int buf_max;
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int col, i, indx, space;
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wint_t ch;
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col = indx = 0;
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while ((ch = getwchar()) != WEOF) {
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if (ch == '\n') {
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wprintf(L"%.*ls\n", indx, buf);
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col = indx = 0;
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continue;
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}
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if ((col = newpos(col, ch)) > width) {
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if (sflag) {
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i = indx;
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while (--i >= 0 && !iswblank(buf[i]))
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;
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space = i;
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}
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if (sflag && space != -1) {
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space++;
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wprintf(L"%.*ls\n", space, buf);
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wmemmove(buf, buf + space, indx - space);
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indx -= space;
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col = 0;
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for (i = 0; i < indx; i++)
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col = newpos(col, buf[i]);
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} else {
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wprintf(L"%.*ls\n", indx, buf);
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col = indx = 0;
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}
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col = newpos(col, ch);
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}
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if (indx + 1 > buf_max) {
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buf_max += LINE_MAX;
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buf = realloc(buf, sizeof(*buf) * buf_max);
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if (buf == NULL)
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err(1, "realloc()");
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}
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buf[indx++] = ch;
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}
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if (indx != 0)
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wprintf(L"%.*ls", indx, buf);
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}
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/*
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* Update the current column position for a character.
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*/
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static int
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newpos(int col, wint_t ch)
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{
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char buf[MB_LEN_MAX];
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size_t len;
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int w;
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if (bflag) {
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len = wcrtomb(buf, ch, NULL);
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col += len;
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} else
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switch (ch) {
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case '\b':
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if (col > 0)
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--col;
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break;
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case '\r':
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col = 0;
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break;
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case '\t':
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col = (col + 8) & ~7;
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break;
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default:
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if ((w = wcwidth(ch)) > 0)
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col += w;
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break;
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}
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return (col);
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}
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