[unix-history] / lib / libc / gen / vis.c

/*-
 * Copyright (c) 1989 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)vis.c	5.4 (Berkeley) 2/23/91";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <ctype.h>
#include <vis.h>

#define	isoctal(c)	(((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')

/*
 * vis - visually encode characters
 */
char *
#if __STDC__
vis(register char *dst, register char c, register int flag, char nextc)
#else
vis(dst, c, flag, nextc)
	register char *dst, c;
	char nextc;
	register int flag;
#endif
{
	if (isascii(c) && isgraph(c) ||
	   ((flag & VIS_SP) == 0 && c == ' ') ||
	   ((flag & VIS_TAB) == 0 && c == '\t') ||
	   ((flag & VIS_NL) == 0 && c == '\n') ||
	   ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
		*dst++ = c;
		if (c == '\\' && (flag & VIS_NOSLASH) == 0)
			*dst++ = '\\';
		*dst = '\0';
		return (dst);
	}

	if (flag & VIS_CSTYLE) {
		switch(c) {
		case '\n':
			*dst++ = '\\';
			*dst++ = 'n';
			goto done;
		case '\r':
			*dst++ = '\\';
			*dst++ = 'r';
			goto done;
		case '\b':
			*dst++ = '\\';
			*dst++ = 'b';
			goto done;
#if __STDC__
		case '\a':
#else
		case '\007':
#endif
			*dst++ = '\\';
			*dst++ = 'a';
			goto done;
		case '\v':
			*dst++ = '\\';
			*dst++ = 'v';
			goto done;
		case '\t':
			*dst++ = '\\';
			*dst++ = 't';
			goto done;
		case '\f':
			*dst++ = '\\';
			*dst++ = 'f';
			goto done;
		case ' ':
			*dst++ = '\\';
			*dst++ = 's';
			goto done;
		case '\0':
			*dst++ = '\\';
			*dst++ = '0';
			if (isoctal(nextc)) {
				*dst++ = '0';
				*dst++ = '0';
			}
			goto done;
		}
	}
	if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {	
		*dst++ = '\\';
		*dst++ = ((u_char)c >> 6 & 07) + '0';
		*dst++ = ((u_char)c >> 3 & 07) + '0';
		*dst++ = ((u_char)c & 07) + '0';
		goto done;
	}
	if ((flag & VIS_NOSLASH) == 0)
		*dst++ = '\\';
	if (c & 0200) {
		c &= 0177;
		*dst++ = 'M';
	}
	if (iscntrl(c)) {
		*dst++ = '^';
		if (c == 0177)
			*dst++ = '?';
		else
			*dst++ = c + '@';
	} else {
		*dst++ = '-';
		*dst++ = c;
	}
done:
	*dst = '\0';
	return (dst);
}

/*
 * strvis, strvisx - visually encode characters from src into dst
 *	
 *	Dst must be 4 times the size of src to account for possible
 *	expansion.  The length of dst, not including the trailing NULL,
 *	is returned. 
 *
 *	Strvisx encodes exactly len bytes from src into dst.
 *	This is useful for encoding a block of data.
 */
int
strvis(dst, src, flag)
	register char *dst;
	register const char *src;
	int flag;
{
	register char c;
	char *start = dst;

	for (;c = *src; src++)
		dst = vis(dst, c, flag, *(src+1));

	return (dst - start);
}

int
strvisx(dst, src, len, flag)
	register char *dst;
	register const char *src;
	register size_t len;
	int flag;
{
	char *start = dst;

	while (len > 1) {
		dst = vis(dst, *src, flag, *(src+1));
		len--;
	}
	if (len)
		dst = vis(dst, *src, flag, '\0');

	return (dst - start);
}
Commit	Line	Data
15637ed4 RG	1	/*-
	2	* Copyright (c) 1989 The Regents of the University of California.
	3	* 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	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#if defined(LIBC_SCCS) && !defined(lint)
	35	static char sccsid[] = "@(#)vis.c 5.4 (Berkeley) 2/23/91";
	36	#endif /* LIBC_SCCS and not lint */
	37
	38	#include <sys/types.h>
	39	#include <ctype.h>
	40	#include <vis.h>
	41
	42	#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
	43
	44	/*
	45	* vis - visually encode characters
	46	*/
	47	char *
	48	#if __STDC__
	49	vis(register char *dst, register char c, register int flag, char nextc)
	50	#else
	51	vis(dst, c, flag, nextc)
	52	register char *dst, c;
	53	char nextc;
	54	register int flag;
	55	#endif
	56	{
	57	if (isascii(c) && isgraph(c) \|\|
	58	((flag & VIS_SP) == 0 && c == ' ') \|\|
	59	((flag & VIS_TAB) == 0 && c == '\t') \|\|
	60	((flag & VIS_NL) == 0 && c == '\n') \|\|
	61	((flag & VIS_SAFE) && (c == '\b' \|\| c == '\007' \|\| c == '\r'))) {
	62	*dst++ = c;
	63	if (c == '\\' && (flag & VIS_NOSLASH) == 0)
	64	*dst++ = '\\';
65	*dst = '\0';
66	return (dst);
67	}
68
69	if (flag & VIS_CSTYLE) {
70	switch(c) {
71	case '\n':
72	*dst++ = '\\';
73	*dst++ = 'n';
74	goto done;
75	case '\r':
76	*dst++ = '\\';
77	*dst++ = 'r';
78	goto done;
79	case '\b':
80	*dst++ = '\\';
81	*dst++ = 'b';
82	goto done;
83	#if __STDC__
84	case '\a':
85	#else
86	case '\007':
87	#endif
88	*dst++ = '\\';
89	*dst++ = 'a';
90	goto done;
91	case '\v':
92	*dst++ = '\\';
93	*dst++ = 'v';
94	goto done;
95	case '\t':
96	*dst++ = '\\';
97	*dst++ = 't';
98	goto done;
99	case '\f':
100	*dst++ = '\\';
101	*dst++ = 'f';
102	goto done;
103	case ' ':
104	*dst++ = '\\';
105	*dst++ = 's';
106	goto done;
107	case '\0':
108	*dst++ = '\\';
109	*dst++ = '0';
110	if (isoctal(nextc)) {
111	*dst++ = '0';
112	*dst++ = '0';
113	}
114	goto done;
115	}
116	}
117	if (((c & 0177) == ' ') \|\| (flag & VIS_OCTAL)) {
118	*dst++ = '\\';
119	*dst++ = ((u_char)c >> 6 & 07) + '0';
120	*dst++ = ((u_char)c >> 3 & 07) + '0';
121	*dst++ = ((u_char)c & 07) + '0';
122	goto done;
123	}
124	if ((flag & VIS_NOSLASH) == 0)
125	*dst++ = '\\';
126	if (c & 0200) {
127	c &= 0177;
128	*dst++ = 'M';
129	}
130	if (iscntrl(c)) {
131	*dst++ = '^';
132	if (c == 0177)
133	*dst++ = '?';
134	else
135	*dst++ = c + '@';
136	} else {
137	*dst++ = '-';
138	*dst++ = c;
139	}
140	done:
141	*dst = '\0';
142	return (dst);
143	}
144
145	/*
146	* strvis, strvisx - visually encode characters from src into dst
147	*
148	* Dst must be 4 times the size of src to account for possible
149	* expansion. The length of dst, not including the trailing NULL,
150	* is returned.
151	*
152	* Strvisx encodes exactly len bytes from src into dst.
153	* This is useful for encoding a block of data.
154	*/
155	int
156	strvis(dst, src, flag)
157	register char *dst;
158	register const char *src;
159	int flag;
160	{
161	register char c;
162	char *start = dst;
163
164	for (;c = *src; src++)
165	dst = vis(dst, c, flag, *(src+1));
166
167	return (dst - start);
168	}
169
170	int
171	strvisx(dst, src, len, flag)
172	register char *dst;
173	register const char *src;
174	register size_t len;
175	int flag;
176	{
177	char *start = dst;
178
179	while (len > 1) {
180	dst = vis(dst, src, flag, (src+1));
181	len--;
182	}
183	if (len)
184	dst = vis(dst, *src, flag, '\0');
185
186	return (dst - start);
187	}