HardenedBSD/usr.bin/hexdump/conv.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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 <sys/types.h>

#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include "hexdump.h"

void
conv_c(PR *pr, u_char *p, size_t bufsize)
{
	char buf[10];
	char const *str;
	wchar_t wc;
	size_t clen, oclen;
	int converr, pad, width;
	u_char peekbuf[MB_LEN_MAX];
	u_char *op;

	op = NULL;

	if (pr->mbleft > 0) {
		str = "**";
		pr->mbleft--;
		goto strpr;
	}

	switch(*p) {
	case '\0':
		str = "\\0";
		goto strpr;
	/* case '\a': */
	case '\007':
		str = "\\a";
		goto strpr;
	case '\b':
		str = "\\b";
		goto strpr;
	case '\f':
		str = "\\f";
		goto strpr;
	case '\n':
		str = "\\n";
		goto strpr;
	case '\r':
		str = "\\r";
		goto strpr;
	case '\t':
		str = "\\t";
		goto strpr;
	case '\v':
		str = "\\v";
		goto strpr;
	default:
		break;
	}
	/*
	 * Multibyte characters are disabled for hexdump(1) for backwards
	 * compatibility and consistency (none of its other output formats
	 * recognize them correctly).
	 */
	converr = 0;
	if (odmode && MB_CUR_MAX > 1) {
		oclen = 0;
retry:
		clen = mbrtowc(&wc, p, bufsize, &pr->mbstate);
		if (clen == 0)
			clen = 1;
		else if (clen == (size_t)-1 || (clen == (size_t)-2 &&
		    p == peekbuf)) {
			memset(&pr->mbstate, 0, sizeof(pr->mbstate));
			if (p == peekbuf) {
				/*
				 * We peeked ahead, but that didn't help --
				 * we either got an illegal sequence or still
				 * can't complete; restore original character.
				 */
				oclen = 0;
				p = op;
			}
			wc = *p;
			clen = 1;
			converr = 1;
		} else if (clen == (size_t)-2) {
			/*
			 * Incomplete character; peek ahead and see if we
			 * can complete it.
			 */
			oclen = bufsize;
			op = p;
			bufsize = peek(p = peekbuf, MB_CUR_MAX);
			goto retry;
		}
		clen += oclen;
	} else {
		wc = *p;
		clen = 1;
	}
	if (!converr && iswprint(wc)) {
		if (!odmode) {
			*pr->cchar = 'c';
			(void)printf(pr->fmt, (int)wc);
		} else {
			*pr->cchar = 'C';
			assert(strcmp(pr->fmt, "%3C") == 0);
			width = wcwidth(wc);
			assert(width >= 0);
			pad = 3 - width;
			if (pad < 0)
				pad = 0;
			(void)printf("%*s%C", pad, "", wc);
			pr->mbleft = clen - 1;
		}
	} else {
		(void)sprintf(buf, "%03o", (int)*p);
		str = buf;
strpr:		*pr->cchar = 's';
		(void)printf(pr->fmt, str);
	}
}

void
conv_u(PR *pr, u_char *p)
{
	static char const * list[] = {
		"nul", "soh", "stx", "etx", "eot", "enq", "ack", "bel",
		 "bs",  "ht",  "lf",  "vt",  "ff",  "cr",  "so",  "si",
		"dle", "dc1", "dc2", "dc3", "dc4", "nak", "syn", "etb",
		"can",  "em", "sub", "esc",  "fs",  "gs",  "rs",  "us",
	};

						/* od used nl, not lf */
	if (*p <= 0x1f) {
		*pr->cchar = 's';
		if (odmode && *p == 0x0a)
			(void)printf(pr->fmt, "nl");
		else
			(void)printf(pr->fmt, list[*p]);
	} else if (*p == 0x7f) {
		*pr->cchar = 's';
		(void)printf(pr->fmt, "del");
	} else if (odmode && *p == 0x20) {	/* od replaced space with sp */
		*pr->cchar = 's';
		(void)printf(pr->fmt, " sp");
	} else if (isprint(*p)) {
		*pr->cchar = 'c';
		(void)printf(pr->fmt, *p);
	} else {
		*pr->cchar = 'x';
		(void)printf(pr->fmt, (int)*p);
	}
}