[apple/libc.git] / gen.subproj / unvis.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * 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. 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.
 */


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

/*
 * decode driven by state machine
 */
#define	S_GROUND	0	/* haven't seen escape char */
#define	S_START		1	/* start decoding special sequence */
#define	S_META		2	/* metachar started (M) */
#define	S_META1		3	/* metachar more, regular char (-) */
#define	S_CTRL		4	/* control char started (^) */
#define	S_OCTAL2	5	/* octal digit 2 */
#define	S_OCTAL3	6	/* octal digit 3 */

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

/*
 * unvis - decode characters previously encoded by vis
 */
int
unvis(cp, c, astate, flag)
	char *cp;
	int c, *astate, flag;
{

	if (flag & UNVIS_END) {
		if (*astate == S_OCTAL2 || *astate == S_OCTAL3) {
			*astate = S_GROUND;
			return (UNVIS_VALID);
		} 
		return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD);
	}

	switch (*astate) {

	case S_GROUND:
		*cp = 0;
		if (c == '\\') {
			*astate = S_START;
			return (0);
		} 
		*cp = c;
		return (UNVIS_VALID);

	case S_START:
		switch(c) {
		case '\\':
			*cp = c;
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case '0': case '1': case '2': case '3':
		case '4': case '5': case '6': case '7':
			*cp = (c - '0');
			*astate = S_OCTAL2;
			return (0);
		case 'M':
			*cp = 0200;
			*astate = S_META;
			return (0);
		case '^':
			*astate = S_CTRL;
			return (0);
		case 'n':
			*cp = '\n';
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case 'r':
			*cp = '\r';
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case 'b':
			*cp = '\b';
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case 'a':
			*cp = '\007';
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case 'v':
			*cp = '\v';
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case 't':
			*cp = '\t';
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case 'f':
			*cp = '\f';
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case 's':
			*cp = ' ';
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case 'E':
			*cp = '\033';
			*astate = S_GROUND;
			return (UNVIS_VALID);
		case '\n':
			/*
			 * hidden newline
			 */
			*astate = S_GROUND;
			return (UNVIS_NOCHAR);
		case '$':
			/*
			 * hidden marker
			 */
			*astate = S_GROUND;
			return (UNVIS_NOCHAR);
		}
		*astate = S_GROUND;
		return (UNVIS_SYNBAD);
		 
	case S_META:
		if (c == '-')
			*astate = S_META1;
		else if (c == '^')
			*astate = S_CTRL;
		else {
			*astate = S_GROUND;
			return (UNVIS_SYNBAD);
		}
		return (0);
		 
	case S_META1:
		*astate = S_GROUND;
		*cp |= c;
		return (UNVIS_VALID);
		 
	case S_CTRL:
		if (c == '?')
			*cp |= 0177;
		else
			*cp |= c & 037;
		*astate = S_GROUND;
		return (UNVIS_VALID);

	case S_OCTAL2:	/* second possible octal digit */
		if (isoctal(c)) {
			/* 
			 * yes - and maybe a third 
			 */
			*cp = (*cp << 3) + (c - '0');
			*astate = S_OCTAL3;	
			return (0);
		} 
		/* 
		 * no - done with current sequence, push back passed char 
		 */
		*astate = S_GROUND;
		return (UNVIS_VALIDPUSH);

	case S_OCTAL3:	/* third possible octal digit */
		*astate = S_GROUND;
		if (isoctal(c)) {
			*cp = (*cp << 3) + (c - '0');
			return (UNVIS_VALID);
		}
		/*
		 * we were done, push back passed char
		 */
		return (UNVIS_VALIDPUSH);
			
	default:	
		/* 
		 * decoder in unknown state - (probably uninitialized) 
		 */
		*astate = S_GROUND;
		return (UNVIS_SYNBAD);
	}
}

/*
 * strunvis - decode src into dst 
 *
 *	Number of chars decoded into dst is returned, -1 on error.
 *	Dst is null terminated.
 */

int
strunvis(dst, src)
	register char *dst;
	register const char *src;
{
	register char c;
	char *start = dst;
	int state = 0;

	while (c = *src++) {
	again:
		switch (unvis(dst, c, &state, 0)) {
		case UNVIS_VALID:
			dst++;
			break;
		case UNVIS_VALIDPUSH:
			dst++;
			goto again;
		case 0:
		case UNVIS_NOCHAR:
			break;
		default:
			return (-1);
		}
	}
	if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID)
		dst++;
	*dst = '\0';
	return (dst - start);
}
Commit	Line	Data
e9ce8d39 A	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1989, 1993
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* Redistribution and use in source and binary forms, with or without
	27	* modification, are permitted provided that the following conditions
	28	* are met:
	29	* 1. Redistributions of source code must retain the above copyright
	30	* notice, this list of conditions and the following disclaimer.
	31	* 2. Redistributions in binary form must reproduce the above copyright
	32	* notice, this list of conditions and the following disclaimer in the
	33	* documentation and/or other materials provided with the distribution.
	34	* 3. All advertising materials mentioning features or use of this software
	35	* must display the following acknowledgement:
	36	* This product includes software developed by the University of
	37	* California, Berkeley and its contributors.
	38	* 4. Neither the name of the University nor the names of its contributors
	39	* may be used to endorse or promote products derived from this software
	40	* without specific prior written permission.
	41	*
	42	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	43	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	44	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	45	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	46	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	47	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	48	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	49	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	50	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	51	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	52	* SUCH DAMAGE.
	53	*/
	54
	55
	56	#include <sys/types.h>
	57	#include <ctype.h>
	58	#include <vis.h>
	59
	60	/*
	61	* decode driven by state machine
	62	*/
	63	#define S_GROUND 0 /* haven't seen escape char */
	64	#define S_START 1 /* start decoding special sequence */
65	#define S_META 2 /* metachar started (M) */
66	#define S_META1 3 /* metachar more, regular char (-) */
67	#define S_CTRL 4 /* control char started (^) */
68	#define S_OCTAL2 5 /* octal digit 2 */
69	#define S_OCTAL3 6 /* octal digit 3 */
70
71	#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
72
73	/*
74	* unvis - decode characters previously encoded by vis
75	*/
76	int
77	unvis(cp, c, astate, flag)
78	char *cp;
79	int c, *astate, flag;
80	{
81
82	if (flag & UNVIS_END) {
83	if (astate == S_OCTAL2 \|\| astate == S_OCTAL3) {
84	*astate = S_GROUND;
85	return (UNVIS_VALID);
86	}
87	return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD);
88	}
89
90	switch (*astate) {
91
92	case S_GROUND:
93	*cp = 0;
94	if (c == '\\') {
95	*astate = S_START;
96	return (0);
97	}
98	*cp = c;
99	return (UNVIS_VALID);
100
101	case S_START:
102	switch(c) {
103	case '\\':
104	*cp = c;
105	*astate = S_GROUND;
106	return (UNVIS_VALID);
107	case '0': case '1': case '2': case '3':
108	case '4': case '5': case '6': case '7':
109	*cp = (c - '0');
110	*astate = S_OCTAL2;
111	return (0);
112	case 'M':
113	*cp = 0200;
114	*astate = S_META;
115	return (0);
116	case '^':
117	*astate = S_CTRL;
118	return (0);
119	case 'n':
120	*cp = '\n';
121	*astate = S_GROUND;
122	return (UNVIS_VALID);
123	case 'r':
124	*cp = '\r';
125	*astate = S_GROUND;
126	return (UNVIS_VALID);
127	case 'b':
128	*cp = '\b';
129	*astate = S_GROUND;
130	return (UNVIS_VALID);
131	case 'a':
132	*cp = '\007';
133	*astate = S_GROUND;
134	return (UNVIS_VALID);
135	case 'v':
136	*cp = '\v';
137	*astate = S_GROUND;
138	return (UNVIS_VALID);
139	case 't':
140	*cp = '\t';
141	*astate = S_GROUND;
142	return (UNVIS_VALID);
143	case 'f':
144	*cp = '\f';
145	*astate = S_GROUND;
146	return (UNVIS_VALID);
147	case 's':
148	*cp = ' ';
149	*astate = S_GROUND;
150	return (UNVIS_VALID);
151	case 'E':
152	*cp = '\033';
153	*astate = S_GROUND;
154	return (UNVIS_VALID);
155	case '\n':
156	/*
157	* hidden newline
158	*/
159	*astate = S_GROUND;
160	return (UNVIS_NOCHAR);
161	case '$':
162	/*
163	* hidden marker
164	*/
165	*astate = S_GROUND;
166	return (UNVIS_NOCHAR);
167	}
168	*astate = S_GROUND;
169	return (UNVIS_SYNBAD);
170
171	case S_META:
172	if (c == '-')
173	*astate = S_META1;
174	else if (c == '^')
175	*astate = S_CTRL;
176	else {
177	*astate = S_GROUND;
178	return (UNVIS_SYNBAD);
179	}
180	return (0);
181
182	case S_META1:
183	*astate = S_GROUND;
184	*cp \|= c;
185	return (UNVIS_VALID);
186
187	case S_CTRL:
188	if (c == '?')
189	*cp \|= 0177;
190	else
191	*cp \|= c & 037;
192	*astate = S_GROUND;
193	return (UNVIS_VALID);
194
195	case S_OCTAL2: /* second possible octal digit */
196	if (isoctal(c)) {
197	/*
198	* yes - and maybe a third
199	*/
200	cp = (cp << 3) + (c - '0');
201	*astate = S_OCTAL3;
202	return (0);
203	}
204	/*
205	* no - done with current sequence, push back passed char
206	*/
207	*astate = S_GROUND;
208	return (UNVIS_VALIDPUSH);
209
210	case S_OCTAL3: /* third possible octal digit */
211	*astate = S_GROUND;
212	if (isoctal(c)) {
213	cp = (cp << 3) + (c - '0');
214	return (UNVIS_VALID);
215	}
216	/*
217	* we were done, push back passed char
218	*/
219	return (UNVIS_VALIDPUSH);
220
221	default:
222	/*
223	* decoder in unknown state - (probably uninitialized)
224	*/
225	*astate = S_GROUND;
226	return (UNVIS_SYNBAD);
227	}
228	}
229
230	/*
231	* strunvis - decode src into dst
232	*
233	* Number of chars decoded into dst is returned, -1 on error.
234	* Dst is null terminated.
235	*/
236
237	int
238	strunvis(dst, src)
239	register char *dst;
240	register const char *src;
241	{
242	register char c;
243	char *start = dst;
244	int state = 0;
245
246	while (c = *src++) {
247	again:
248	switch (unvis(dst, c, &state, 0)) {
249	case UNVIS_VALID:
250	dst++;
251	break;
252	case UNVIS_VALIDPUSH:
253	dst++;
254	goto again;
255	case 0:
256	case UNVIS_NOCHAR:
257	break;
258	default:
259	return (-1);
260	}
261	}
262	if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID)
263	dst++;
264	*dst = '\0';
265	return (dst - start);
266	}