getttyent.c revision 1.3 
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)
35static char rcsid[] = "$OpenBSD: getttyent.c,v 1.3 1996/09/15 09:31:03 tholo Exp $";
36#endif /* LIBC_SCCS and not lint */
37
38#include <ttyent.h>
39#include <stdio.h>
40#include <ctype.h>
41#include <string.h>
42
43static char zapchar;
44static FILE *tf;
45
46static char *skip __P((char *));
47static char *value __P((char *));
48
49struct ttyent *
50getttynam(tty)
51	const char *tty;
52{
53	register struct ttyent *t;
54
55	setttyent();
56	while (t = getttyent())
57		if (!strcmp(tty, t->ty_name))
58			break;
59	endttyent();
60	return (t);
61}
62
63struct ttyent *
64getttyent()
65{
66	static struct ttyent tty;
67	register int c;
68	register char *p;
69#define	MAXLINELENGTH	200
70	static char line[MAXLINELENGTH];
71
72	if (!tf && !setttyent())
73		return (NULL);
74	for (;;) {
75		if (!fgets(p = line, sizeof(line), tf))
76			return (NULL);
77		/* skip lines that are too big */
78		if (!strchr(p, '\n')) {
79			while ((c = getc(tf)) != '\n' && c != EOF)
80				;
81			continue;
82		}
83		while (isspace(*p))
84			++p;
85		if (*p && *p != '#')
86			break;
87	}
88
89	zapchar = 0;
90	tty.ty_name = p;
91	p = skip(p);
92	if (!*(tty.ty_getty = p))
93		tty.ty_getty = tty.ty_type = NULL;
94	else {
95		p = skip(p);
96		if (!*(tty.ty_type = p))
97			tty.ty_type = NULL;
98		else
99			p = skip(p);
100	}
101	tty.ty_status = 0;
102	tty.ty_window = NULL;
103
104#define	scmp(e)	!strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
105#define	vcmp(e)	!strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
106	for (; *p; p = skip(p)) {
107		if (scmp(_TTYS_OFF))
108			tty.ty_status &= ~TTY_ON;
109		else if (scmp(_TTYS_ON))
110			tty.ty_status |= TTY_ON;
111		else if (scmp(_TTYS_SECURE))
112			tty.ty_status |= TTY_SECURE;
113		else if (scmp(_TTYS_LOCAL))
114			tty.ty_status |= TTY_LOCAL;
115		else if (scmp(_TTYS_RTSCTS))
116			tty.ty_status |= TTY_RTSCTS;
117		else if (scmp(_TTYS_SOFTCAR))
118			tty.ty_status |= TTY_SOFTCAR;
119		else if (scmp(_TTYS_MDMBUF))
120			tty.ty_status |= TTY_MDMBUF;
121		else if (vcmp(_TTYS_WINDOW))
122			tty.ty_window = value(p);
123		else
124			break;
125	}
126
127	if (zapchar == '#' || *p == '#')
128		while ((c = *++p) == ' ' || c == '\t')
129			;
130	tty.ty_comment = p;
131	if (*p == 0)
132		tty.ty_comment = 0;
133	if (p = strchr(p, '\n'))
134		*p = '\0';
135	return (&tty);
136}
137
138#define	QUOTED	1
139
140/*
141 * Skip over the current field, removing quotes, and return a pointer to
142 * the next field.
143 */
144static char *
145skip(p)
146	register char *p;
147{
148	register char *t;
149	register int c, q;
150
151	for (q = 0, t = p; (c = *p) != '\0'; p++) {
152		if (c == '"') {
153			q ^= QUOTED;	/* obscure, but nice */
154			continue;
155		}
156		if (q == QUOTED && *p == '\\' && *(p+1) == '"')
157			p++;
158		*t++ = *p;
159		if (q == QUOTED)
160			continue;
161		if (c == '#') {
162			zapchar = c;
163			*p = 0;
164			break;
165		}
166		if (c == '\t' || c == ' ' || c == '\n') {
167			zapchar = c;
168			*p++ = 0;
169			while ((c = *p) == '\t' || c == ' ' || c == '\n')
170				p++;
171			break;
172		}
173	}
174	*--t = '\0';
175	return (p);
176}
177
178static char *
179value(p)
180	register char *p;
181{
182
183	return ((p = strchr(p, '=')) ? ++p : NULL);
184}
185
186int
187setttyent()
188{
189
190	if (tf) {
191		rewind(tf);
192		return (1);
193	} else if (tf = fopen(_PATH_TTYS, "r"))
194		return (1);
195	return (0);
196}
197
198int
199endttyent()
200{
201	int rval;
202
203	if (tf) {
204		rval = !(fclose(tf) == EOF);
205		tf = NULL;
206		return (rval);
207	}
208	return (1);
209}
210