From 5b57d28ffb6e1ef86b50f7d05d977826eae89bfe Mon Sep 17 00:00:00 2001 From: Kiyoshi Aman Date: Fri, 1 Feb 2019 22:55:37 +0000 Subject: initial population --- usr.bin/fold/fold.c | 248 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 248 insertions(+) create mode 100644 usr.bin/fold/fold.c (limited to 'usr.bin/fold/fold.c') diff --git a/usr.bin/fold/fold.c b/usr.bin/fold/fold.c new file mode 100644 index 0000000..52ecc3d --- /dev/null +++ b/usr.bin/fold/fold.c @@ -0,0 +1,248 @@ +/* $NetBSD: fold.c,v 1.17 2011/09/04 20:24:59 joerg Exp $ */ + +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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 + * 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. + */ + +#include +#ifndef lint +__COPYRIGHT("@(#) Copyright (c) 1990, 1993\ + The Regents of the University of California. All rights reserved."); +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)fold.c 8.1 (Berkeley) 6/6/93"; +#endif +__RCSID("$NetBSD: fold.c,v 1.17 2011/09/04 20:24:59 joerg Exp $"); +#endif /* not lint */ + +#include +#include +#include +#include +#include +#include +#include + +#define DEFLINEWIDTH 80 + +static void fold(int); +static int new_column_position(int, wint_t); +__dead static void usage(void); + +static int count_bytes = 0; +static int split_words = 0; + +int +main(int argc, char **argv) +{ + int ch; + int width; + char *p; + + setlocale(LC_CTYPE, ""); + setprogname(argv[0]); + + width = -1; + while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1) + switch (ch) { + case 'b': + count_bytes = 1; + break; + case 's': + split_words = 1; + break; + case 'w': + if ((width = atoi(optarg)) <= 0) + errx(1, "illegal width value"); + 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: + usage(); + } + argv += optind; + argc -= optind; + + if (width == -1) + width = DEFLINEWIDTH; + + if (!*argv) + fold(width); + else for (; *argv; ++argv) + if (!freopen(*argv, "r", stdin)) { + err (1, "%s", *argv); + /* NOTREACHED */ + } 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 +fold(int width) +{ + static wchar_t *buf = NULL; + wchar_t *nbuf; + static int buf_max = 0; + wint_t ch; + int col, indx, i; + + col = indx = 0; + while ((ch = getwchar()) != WEOF) { + if (ch == L'\n') { + if (indx != 0) { + for (i = 0; i < indx; i++) + putwchar(buf[i]); + } + putwchar(L'\n'); + col = indx = 0; + continue; + } + + col = new_column_position (col, ch); + if (col > width) { + int 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] == L' ') + last_space = i; + } + + if (split_words && last_space != -1) { + for (i = 0; i < last_space; i++) + putwchar(buf[i]); + + /* increase last_space here, so we skip trailing whitespace */ + last_space++; + wmemmove (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 { + for (i = 0; i < indx; i++) + putwchar(buf[i]); + col = indx = 0; + } + putwchar('\n'); + + /* calculate the column position for the next line. */ + col = new_column_position (col, ch); + } + + if (indx + 1 > buf_max) { + /* Allocate buffer in LINE_MAX increments */ + if ((nbuf = realloc (buf, buf_max + 2048)) == NULL) { + err (1, "realloc"); + /* NOTREACHED */ + } + buf = nbuf; + buf_max += 2048; + } + buf[indx++] = ch; + } + + if (indx != 0) { + for (i = 0; i < indx; i++) + putwchar(buf[i]); + } +} + +/* + * calculate the column position + */ +static int +new_column_position (int col, wint_t ch) +{ + int w; + + if (!count_bytes) { + switch (ch) { + case L'\b': + if (col > 0) + --col; + break; + case L'\r': + col = 0; + break; + case L'\t': + col = (col + 8) & ~7; + break; + default: + w = wcwidth(ch); + if (w > 0) + col += w; + break; + } + } else { + char dummy[MB_LEN_MAX]; + + /* XXX: we assume stateless encoding */ + col += wcrtomb(dummy, ch, NULL); + } + + return col; +} + +static void +usage(void) +{ + (void)fprintf(stderr, + "usage: %s [-bs] [-w width] [file ...]\n", getprogname()); + exit(1); +} + -- cgit v1.2.3-60-g2f50