1/*
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char sccsid[] = "@(#)conv.c	8.1 (Berkeley) 6/6/93";
32#endif /* not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/11/usr.bin/hexdump/conv.c 328500 2018-01-27 23:20:01Z kevans $");
35
36#include <sys/types.h>
37
38#include <assert.h>
39#include <ctype.h>
40#include <limits.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <wchar.h>
45#include <wctype.h>
46#include "hexdump.h"
47
48void
49conv_c(PR *pr, u_char *p, size_t bufsize)
50{
51	char buf[10];
52	char const *str;
53	wchar_t wc;
54	size_t clen, oclen;
55	int converr, pad, width;
56	u_char peekbuf[MB_LEN_MAX];
57	u_char *op;
58
59	op = NULL;
60
61	if (pr->mbleft > 0) {
62		str = "**";
63		pr->mbleft--;
64		goto strpr;
65	}
66
67	switch(*p) {
68	case '\0':
69		str = "\\0";
70		goto strpr;
71	/* case '\a': */
72	case '\007':
73		str = "\\a";
74		goto strpr;
75	case '\b':
76		str = "\\b";
77		goto strpr;
78	case '\f':
79		str = "\\f";
80		goto strpr;
81	case '\n':
82		str = "\\n";
83		goto strpr;
84	case '\r':
85		str = "\\r";
86		goto strpr;
87	case '\t':
88		str = "\\t";
89		goto strpr;
90	case '\v':
91		str = "\\v";
92		goto strpr;
93	default:
94		break;
95	}
96	/*
97	 * Multibyte characters are disabled for hexdump(1) for backwards
98	 * compatibility and consistency (none of its other output formats
99	 * recognize them correctly).
100	 */
101	converr = 0;
102	if (odmode && MB_CUR_MAX > 1) {
103		oclen = 0;
104retry:
105		clen = mbrtowc(&wc, p, bufsize, &pr->mbstate);
106		if (clen == 0)
107			clen = 1;
108		else if (clen == (size_t)-1 || (clen == (size_t)-2 &&
109		    p == peekbuf)) {
110			memset(&pr->mbstate, 0, sizeof(pr->mbstate));
111			if (p == peekbuf) {
112				/*
113				 * We peeked ahead, but that didn't help --
114				 * we either got an illegal sequence or still
115				 * can't complete; restore original character.
116				 */
117				oclen = 0;
118				p = op;
119			}
120			wc = *p;
121			clen = 1;
122			converr = 1;
123		} else if (clen == (size_t)-2) {
124			/*
125			 * Incomplete character; peek ahead and see if we
126			 * can complete it.
127			 */
128			oclen = bufsize;
129			op = p;
130			bufsize = peek(p = peekbuf, MB_CUR_MAX);
131			goto retry;
132		}
133		clen += oclen;
134	} else {
135		wc = *p;
136		clen = 1;
137	}
138	if (!converr && iswprint(wc)) {
139		if (!odmode) {
140			*pr->cchar = 'c';
141			(void)printf(pr->fmt, (int)wc);
142		} else {
143			*pr->cchar = 'C';
144			assert(strcmp(pr->fmt, "%3C") == 0);
145			width = wcwidth(wc);
146			assert(width >= 0);
147			pad = 3 - width;
148			if (pad < 0)
149				pad = 0;
150			(void)printf("%*s%C", pad, "", wc);
151			pr->mbleft = clen - 1;
152		}
153	} else {
154		(void)sprintf(buf, "%03o", (int)*p);
155		str = buf;
156strpr:		*pr->cchar = 's';
157		(void)printf(pr->fmt, str);
158	}
159}
160
161void
162conv_u(PR *pr, u_char *p)
163{
164	static char const * list[] = {
165		"nul", "soh", "stx", "etx", "eot", "enq", "ack", "bel",
166		 "bs",  "ht",  "lf",  "vt",  "ff",  "cr",  "so",  "si",
167		"dle", "dc1", "dc2", "dc3", "dc4", "nak", "syn", "etb",
168		"can",  "em", "sub", "esc",  "fs",  "gs",  "rs",  "us",
169	};
170
171						/* od used nl, not lf */
172	if (*p <= 0x1f) {
173		*pr->cchar = 's';
174		if (odmode && *p == 0x0a)
175			(void)printf(pr->fmt, "nl");
176		else
177			(void)printf(pr->fmt, list[*p]);
178	} else if (*p == 0x7f) {
179		*pr->cchar = 's';
180		(void)printf(pr->fmt, "del");
181	} else if (odmode && *p == 0x20) {	/* od replaced space with sp */
182		*pr->cchar = 's';
183		(void)printf(pr->fmt, " sp");
184	} else if (isprint(*p)) {
185		*pr->cchar = 'c';
186		(void)printf(pr->fmt, *p);
187	} else {
188		*pr->cchar = 'x';
189		(void)printf(pr->fmt, (int)*p);
190	}
191}
192