[apple/libc.git] / gen / getttyent.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 <ttyent.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>

static char zapchar;
static FILE *tf;

struct ttyent *
getttynam(tty)
	const char *tty;
{
	register struct ttyent *t;

	setttyent();
	while (t = getttyent())
		if (!strcmp(tty, t->ty_name))
			break;
	endttyent();
	return (t);
}

struct ttyent *
getttyent()
{
	static struct ttyent tty;
	register int c;
	register char *p;
#define	MAXLINELENGTH	1024
	static char *line = NULL;
	static char *skip(), *value();

	if ( line == NULL ) {
		line = malloc(MAXLINELENGTH);
		if( line == NULL )
			return NULL;
	}

	if (!tf && !setttyent())
		return (NULL);
	for (;;) {
		if (!fgets(p = line, MAXLINELENGTH, tf))
			return (NULL);
		/* skip lines that are too big */
		if (!index(p, '\n')) {
			while ((c = getc(tf)) != '\n' && c != EOF)
				;
			continue;
		}
		while (isspace(*p))
			++p;
		if (*p && *p != '#')
			break;
	}

	zapchar = 0;
	tty.ty_name = p;
	p = skip(p);
	if (!*(tty.ty_getty = p))
		tty.ty_getty = tty.ty_type = NULL;
	else {
		p = skip(p);
		if (!*(tty.ty_type = p))
			tty.ty_type = NULL;
		else
			p = skip(p);
	}
	tty.ty_status = 0;
	tty.ty_window = NULL;
	tty.ty_onerror = NULL;
	tty.ty_onoption = NULL;

#define	scmp(e)	!strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
#define	vcmp(e)	!strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
	for (; *p; p = skip(p)) {
		if (scmp(_TTYS_OFF))
			tty.ty_status &= ~TTY_ON;
		else if (scmp(_TTYS_ON))
			tty.ty_status |= TTY_ON;
		else if (scmp(_TTYS_SECURE))
			tty.ty_status |= TTY_SECURE;
		else if (vcmp(_TTYS_WINDOW))
			tty.ty_window = value(p);
		else if (vcmp(_TTYS_ONERROR))
			tty.ty_onerror = value(p);
		else if (vcmp(_TTYS_ONOPTION))
			tty.ty_onoption = value(p);
		else
			break;
	}

	if (zapchar == '#' || *p == '#')
		while ((c = *++p) == ' ' || c == '\t')
			;
	tty.ty_comment = p;
	if (*p == 0)
		tty.ty_comment = 0;
	if (p = index(p, '\n'))
		*p = '\0';
	return (&tty);
}

#define	QUOTED	1

/*
 * Skip over the current field, removing quotes, and return a pointer to
 * the next field.
 */
static char *
skip(p)
	register char *p;
{
	register char *t;
	register int c, q;

	for (q = 0, t = p; (c = *p) != '\0'; p++) {
		if (c == '"') {
			q ^= QUOTED;	/* obscure, but nice */
			continue;
		}
		if (q == QUOTED && *p == '\\' && *(p+1) == '"')
			p++;
		*t++ = *p;
		if (q == QUOTED)
			continue;
		if (c == '#') {
			zapchar = c;
			*p = 0;
			break;
		}
		if (c == '\t' || c == ' ' || c == '\n') {
			zapchar = c;
			*p++ = 0;
			while ((c = *p) == '\t' || c == ' ' || c == '\n')
				p++;
			break;
		}
	}
	*--t = '\0';
	return (p);
}

static char *
value(p)
	register char *p;
{

	return ((p = index(p, '=')) ? ++p : NULL);
}

int
setttyent()
{

	if (tf) {
		(void)rewind(tf);
		return (1);
	} else if (tf = fopen(_PATH_TTYS, "r"))
		return (1);
	return (0);
}

int
endttyent()
{
	int rval;

	if (tf) {
		rval = !(fclose(tf) == EOF);
		tf = NULL;
		return (rval);
	}
	return (1);
}
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 <ttyent.h>
	57	#include <stdio.h>
	58	#include <ctype.h>
	59	#include <string.h>
5b2abdfb	60	#include <stdlib.h>
e9ce8d39 A	61
	62	static char zapchar;
	63	static FILE *tf;
	64
	65	struct ttyent *
	66	getttynam(tty)
	67	const char *tty;
	68	{
	69	register struct ttyent *t;
	70
	71	setttyent();
	72	while (t = getttyent())
	73	if (!strcmp(tty, t->ty_name))
	74	break;
	75	endttyent();
	76	return (t);
	77	}
	78
	79	struct ttyent *
	80	getttyent()
	81	{
	82	static struct ttyent tty;
	83	register int c;
	84	register char *p;
	85	#define MAXLINELENGTH 1024
5b2abdfb	86	static char *line = NULL;
e9ce8d39 A	87	static char skip(), value();
e9ce8d39 A	88
5b2abdfb A	89	if ( line == NULL ) {
	90	line = malloc(MAXLINELENGTH);
	91	if( line == NULL )
	92	return NULL;
	93	}
	94
e9ce8d39 A	95	if (!tf && !setttyent())
	96	return (NULL);
	97	for (;;) {
5b2abdfb	98	if (!fgets(p = line, MAXLINELENGTH, tf))
e9ce8d39 A	99	return (NULL);
	100	/* skip lines that are too big */
	101	if (!index(p, '\n')) {
	102	while ((c = getc(tf)) != '\n' && c != EOF)
	103	;
	104	continue;
	105	}
	106	while (isspace(*p))
	107	++p;
	108	if (p && p != '#')
	109	break;
	110	}
	111
	112	zapchar = 0;
	113	tty.ty_name = p;
	114	p = skip(p);
	115	if (!*(tty.ty_getty = p))
	116	tty.ty_getty = tty.ty_type = NULL;
	117	else {
	118	p = skip(p);
	119	if (!*(tty.ty_type = p))
	120	tty.ty_type = NULL;
	121	else
	122	p = skip(p);
	123	}
	124	tty.ty_status = 0;
	125	tty.ty_window = NULL;
	126	tty.ty_onerror = NULL;
	127	tty.ty_onoption = NULL;
	128
	129	#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
	130	#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
	131	for (; *p; p = skip(p)) {
	132	if (scmp(_TTYS_OFF))
	133	tty.ty_status &= ~TTY_ON;
	134	else if (scmp(_TTYS_ON))
	135	tty.ty_status \|= TTY_ON;
	136	else if (scmp(_TTYS_SECURE))
	137	tty.ty_status \|= TTY_SECURE;
	138	else if (vcmp(_TTYS_WINDOW))
	139	tty.ty_window = value(p);
	140	else if (vcmp(_TTYS_ONERROR))
	141	tty.ty_onerror = value(p);
	142	else if (vcmp(_TTYS_ONOPTION))
	143	tty.ty_onoption = value(p);
	144	else
	145	break;
	146	}
	147
	148	if (zapchar == '#' \|\| *p == '#')
	149	while ((c = *++p) == ' ' \|\| c == '\t')
	150	;
	151	tty.ty_comment = p;
	152	if (*p == 0)
	153	tty.ty_comment = 0;
	154	if (p = index(p, '\n'))
	155	*p = '\0';
	156	return (&tty);
	157	}
	158
	159	#define QUOTED 1
	160
	161	/*
	162	* Skip over the current field, removing quotes, and return a pointer to
163	* the next field.
164	*/
165	static char *
166	skip(p)
167	register char *p;
168	{
169	register char *t;
170	register int c, q;
171
172	for (q = 0, t = p; (c = *p) != '\0'; p++) {
173	if (c == '"') {
174	q ^= QUOTED; /* obscure, but nice */
175	continue;
176	}
177	if (q == QUOTED && p == '\\' && (p+1) == '"')
178	p++;
179	t++ = p;
180	if (q == QUOTED)
181	continue;
182	if (c == '#') {
183	zapchar = c;
184	*p = 0;
185	break;
186	}
187	if (c == '\t' \|\| c == ' ' \|\| c == '\n') {
188	zapchar = c;
189	*p++ = 0;
190	while ((c = *p) == '\t' \|\| c == ' ' \|\| c == '\n')
191	p++;
192	break;
193	}
194	}
195	*--t = '\0';
196	return (p);
197	}
198
199	static char *
200	value(p)
201	register char *p;
202	{
203
204	return ((p = index(p, '=')) ? ++p : NULL);
205	}
206
207	int
208	setttyent()
209	{
210
211	if (tf) {
212	(void)rewind(tf);
213	return (1);
214	} else if (tf = fopen(_PATH_TTYS, "r"))
215	return (1);
216	return (0);
217	}
218
219	int
220	endttyent()
221	{
222	int rval;
223
224	if (tf) {
225	rval = !(fclose(tf) == EOF);
226	tf = NULL;
227	return (rval);
228	}
229	return (1);
230	}