GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/fold/fold.c Lines: 68 97 70.1 %
Date: 2017-11-07 Branches: 64 102 62.7 %

Line Branch Exec Source
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/*	$OpenBSD: fold.c,v 1.18 2016/05/23 10:31:42 schwarze Exp $	*/
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/*	$NetBSD: fold.c,v 1.6 1995/09/01 01:42:44 jtc Exp $	*/
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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 <ctype.h>
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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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#define	DEFLINEWIDTH	80
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static void fold(unsigned int);
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static int isu8cont(unsigned char);
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static __dead void usage(void);
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int count_bytes = 0;
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int split_words = 0;
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int
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main(int argc, char *argv[])
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{
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	int ch, lastch, newarg, prevoptind;
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	unsigned int width;
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1044
	const char *errstr;
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522
	setlocale(LC_CTYPE, "");
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	if (pledge("stdio rpath flock cpath wpath", NULL) == -1)
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		err(1, "pledge");
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	width = 0;
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	lastch = '\0';
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	prevoptind = 1;
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	newarg = 1;
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2574
	while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1) {
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765
		switch (ch) {
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		case 'b':
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261
			count_bytes = 1;
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			break;
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		case 's':
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			split_words = 1;
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			break;
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		case 'w':
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468
			width = strtonum(optarg, 1, UINT_MAX, &errstr);
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468
			if (errstr != NULL)
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				errx(1, "illegal width value, %s: %s", errstr,
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					optarg);
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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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			if (newarg)
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				width = 0;
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			else if (!isdigit(lastch))
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				usage();
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			if (width > UINT_MAX / 10 - 1)
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				errx(1, "illegal width value, too large");
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			width = (width * 10) + (ch - '0');
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			if (width < 1)
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				errx(1, "illegal width value, too small");
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			break;
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		default:
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			usage();
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		}
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		lastch = ch;
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765
		newarg = optind != prevoptind;
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		prevoptind = optind;
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	}
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522
	argv += optind;
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	argc -= optind;
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	if (width == 0)
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		width = DEFLINEWIDTH;
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	if (!*argv) {
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522
		if (pledge("stdio flock rpath cpath wpath", NULL) == -1)
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			err(1, "pledge");
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		fold(width);
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522
	} else {
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		for (; *argv; ++argv) {
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			if (!freopen(*argv, "r", stdin))
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				err(1, "%s", *argv);
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			else
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				fold(width);
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		}
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	}
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	return 0;
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522
}
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/*
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 * Fold the contents of standard input to fit within WIDTH columns
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 * (or bytes) and write to standard output.
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 *
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 * If split_words is set, split the line at the last space character
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 * on the line.  This flag necessitates storing the line in a buffer
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 * until the current 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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static void
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fold(unsigned int max_width)
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{
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	static char	*buf = NULL;
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	static size_t	 bufsz = 2048;
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	char		*cp;	/* Current mb character. */
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	char		*np;	/* Next mb character. */
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	char		*sp;	/* To search for the last space. */
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	char		*nbuf;	/* For buffer reallocation. */
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	wchar_t		 wc;	/* Current wide character. */
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	int		 ch;	/* Last byte read. */
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	int		 len;	/* Bytes in the current mb character. */
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	unsigned int	 col;	/* Current display position. */
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	int		 width; /* Display width of wc. */
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1044
	if (buf == NULL && (buf = malloc(bufsz)) == NULL)
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		err(1, NULL);
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	np = cp = buf;
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	ch = 0;
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	col = 0;
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3357
	while (ch != EOF) {  /* Loop on input characters. */
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13248
		while ((ch = getchar()) != EOF) {  /* Loop on input bytes. */
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2790
			if (np + 1 == buf + bufsz) {
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				nbuf = reallocarray(buf, 2, bufsz);
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				if (nbuf == NULL)
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					err(1, NULL);
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				bufsz *= 2;
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				cp = nbuf + (cp - buf);
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				np = nbuf + (np - buf);
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				buf = nbuf;
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			}
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2790
			*np++ = ch;
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			/*
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			 * Read up to and including the first byte of
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			 * the next character, such that we are sure
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			 * to have a complete character in the buffer.
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			 * There is no need to read more than five bytes
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			 * ahead, since UTF-8 characters are four bytes
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			 * long at most.
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			 */
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7677
			if (np - cp > 4 || (np - cp > 1 && !isu8cont(ch)))
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				break;
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		}
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5490
		while (cp < np) {  /* Loop on output characters. */
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			/* Handle end of line and backspace. */
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9414
			if (*cp == '\n' || (*cp == '\r' && !count_bytes)) {
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				fwrite(buf, 1, ++cp - buf, stdout);
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				memmove(buf, cp, np - cp);
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				np = buf + (np - cp);
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				cp = buf;
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				col = 0;
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189
				continue;
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			}
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4608
			if (*cp == '\b' && !count_bytes) {
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63
				if (col)
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54
					col--;
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				cp++;
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				continue;
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			}
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203
			/*
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			 * Measure display width.
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			 * Process the last byte only if
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			 * end of file was reached.
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			 */
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4545
			if (np - cp > (ch != EOF)) {
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				len = 1;
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				width = 1;
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2880
				if (*cp == '\t') {
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					if (count_bytes == 0)
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						width = 8 - (col & 7);
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5634
				} else if ((len = mbtowc(&wc, cp,
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2817
				    np - cp)) < 1)
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					len = 1;
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2655
				else if (count_bytes)
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1395
					width = len;
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1260
				else if ((width = wcwidth(wc)) < 0)
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					width = 1;
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2880
				col += width;
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3546
				if (col <= max_width || cp == buf) {
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2268
					cp += len;
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2268
					continue;
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				}
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			}
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			/* Line break required. */
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2277
			if (col > max_width) {
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657
				if (split_words) {
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					for (sp = cp; sp > buf; sp--) {
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180
						if (sp[-1] == ' ') {
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							cp = sp;
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							break;
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						}
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					}
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				}
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657
				fwrite(buf, 1, cp - buf, stdout);
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1314
				putchar('\n');
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657
				memmove(buf, cp, np - cp);
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657
				np = buf + (np - cp);
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				cp = buf;
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				col = 0;
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657
				continue;
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			}
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251
			/* Need more input. */
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253
			break;
254
		}
255
	}
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522
	fwrite(buf, 1, np - buf, stdout);
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258

1044
	if (ferror(stdin))
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		err(1, NULL);
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522
}
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262
static int
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isu8cont(unsigned char c)
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{
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7254
	return MB_CUR_MAX > 1 && (c & (0x80 | 0x40)) == 0x80;
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}
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static __dead 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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}