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