[apple/libc.git] / gen / unvis-fbsd.c

/*-
 * 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)unvis.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/unvis.c,v 1.9 2004/08/02 08:46:23 stefanf Exp $");

#include "xlocale_private.h"

#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	S_HEX2		7	/* hex digit 2 */

#define	S_HTTP		0x080	/* %HEXHEX escape */

#define	isoctal(c)	(((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define	ishex(c)	((((u_char)(c)) >= '0' && ((u_char)(c)) <= '9') || (((u_char)(c)) >= 'a' && ((u_char)(c)) <= 'f'))

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

	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 & ~S_HTTP) {

	case S_GROUND:
		*cp = 0;
		if (c == '\\') {
			*astate = S_START;
			return (0);
		}
		if (flag & VIS_HTTPSTYLE && c == '%') {
			*astate = S_START | S_HTTP;
			return (0);
		}
		*cp = c;
		return (UNVIS_VALID);

	case S_START:
		if (*astate & S_HTTP) {
		    if (ishex(tolower_l(c, loc))) {
			*cp = isdigit_l(c, loc) ? (c - '0') : (tolower_l(c, loc) - 'a');
			*astate = S_HEX2;
			return (0);
		    }
		}
		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);

	case S_HEX2:	/* second mandatory hex digit */
		if (ishex(tolower_l(c, loc))) {
			*cp = (isdigit_l(c, loc) ? (*cp << 4) + (c - '0') : (*cp << 4) + (tolower_l(c, loc) - 'a' + 10));
		}
		*astate = S_GROUND;
		return (UNVIS_VALID);

	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(char *dst, const char *src)
{
	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);
}

int
strunvisx(char *dst, const char *src, int flag)
{
	char c;
	char *start = dst;
	int state = 0;
    
	while ( (c = *src++) ) {
	again:
		switch (unvis(dst, c, &state, flag)) {
		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
224c7076 A	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	* 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[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93";
	36	#endif /* LIBC_SCCS and not lint */
	37	#include <sys/cdefs.h>
	38	__FBSDID("$FreeBSD: src/lib/libc/gen/unvis.c,v 1.9 2004/08/02 08:46:23 stefanf Exp $");
	39
	40	#include "xlocale_private.h"
	41
	42	#include <sys/types.h>
	43	#include <ctype.h>
	44	#include <vis.h>
	45
	46	/*
	47	* decode driven by state machine
	48	*/
	49	#define S_GROUND 0 /* haven't seen escape char */
	50	#define S_START 1 /* start decoding special sequence */
	51	#define S_META 2 /* metachar started (M) */
	52	#define S_META1 3 /* metachar more, regular char (-) */
	53	#define S_CTRL 4 /* control char started (^) */
	54	#define S_OCTAL2 5 /* octal digit 2 */
	55	#define S_OCTAL3 6 /* octal digit 3 */
	56	#define S_HEX2 7 /* hex digit 2 */
	57
	58	#define S_HTTP 0x080 /* %HEXHEX escape */
	59
	60	#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
	61	#define ishex(c) ((((u_char)(c)) >= '0' && ((u_char)(c)) <= '9') \|\| (((u_char)(c)) >= 'a' && ((u_char)(c)) <= 'f'))
	62
	63	/*
	64	* unvis - decode characters previously encoded by vis
65	*/
66	int
67	unvis(char cp, int c, int astate, int flag)
68	{
69	locale_t loc = __current_locale();
70
71	if (flag & UNVIS_END) {
72	if (astate == S_OCTAL2 \|\| astate == S_OCTAL3) {
73	*astate = S_GROUND;
74	return (UNVIS_VALID);
75	}
76	return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD);
77	}
78
79	switch (*astate & ~S_HTTP) {
80
81	case S_GROUND:
82	*cp = 0;
83	if (c == '\\') {
84	*astate = S_START;
85	return (0);
86	}
87	if (flag & VIS_HTTPSTYLE && c == '%') {
88	*astate = S_START \| S_HTTP;
89	return (0);
90	}
91	*cp = c;
92	return (UNVIS_VALID);
93
94	case S_START:
95	if (*astate & S_HTTP) {
96	if (ishex(tolower_l(c, loc))) {
97	*cp = isdigit_l(c, loc) ? (c - '0') : (tolower_l(c, loc) - 'a');
98	*astate = S_HEX2;
99	return (0);
100	}
101	}
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	case S_HEX2: /* second mandatory hex digit */
222	if (ishex(tolower_l(c, loc))) {
223	cp = (isdigit_l(c, loc) ? (cp << 4) + (c - '0') : (*cp << 4) + (tolower_l(c, loc) - 'a' + 10));
224	}
225	*astate = S_GROUND;
226	return (UNVIS_VALID);
227
228	default:
229	/*
230	* decoder in unknown state - (probably uninitialized)
231	*/
232	*astate = S_GROUND;
233	return (UNVIS_SYNBAD);
234	}
235	}
236
237	/*
238	* strunvis - decode src into dst
239	*
240	* Number of chars decoded into dst is returned, -1 on error.
241	* Dst is null terminated.
242	*/
243
244	int
245	strunvis(char dst, const char src)
246	{
247	char c;
248	char *start = dst;
249	int state = 0;
250
251	while ( (c = *src++) ) {
252	again:
253	switch (unvis(dst, c, &state, 0)) {
254	case UNVIS_VALID:
255	dst++;
256	break;
257	case UNVIS_VALIDPUSH:
258	dst++;
259	goto again;
260	case 0:
261	case UNVIS_NOCHAR:
262	break;
263	default:
264	return (-1);
265	}
266	}
267	if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID)
268	dst++;
269	*dst = '\0';
270	return (dst - start);
271	}
272
273	int
274	strunvisx(char dst, const char src, int flag)
275	{
276	char c;
277	char *start = dst;
278	int state = 0;
279
280	while ( (c = *src++) ) {
281	again:
282	switch (unvis(dst, c, &state, flag)) {
283	case UNVIS_VALID:
284	dst++;
285	break;
286	case UNVIS_VALIDPUSH:
287	dst++;
288	goto again;
289	case 0:
290	case UNVIS_NOCHAR:
291	break;
292	default:
293	return (-1);
294	}
295	}
296	if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID)
297	dst++;
298	*dst = '\0';
299	return (dst - start);
300	}