xref: /openbsd/lib/libc/gen/getttyent.c (revision abda6c13)
1 /*	$OpenBSD: getttyent.c,v 1.15 2015/09/13 11:47:54 guenther Exp $ */
2 /*
3  * Copyright (c) 1989, 1993
4  *	The Regents of the University of California.  All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. Neither the name of the University nor the names of its contributors
15  *    may be used to endorse or promote products derived from this software
16  *    without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30 
31 #include <ttyent.h>
32 #include <stdio.h>
33 #include <ctype.h>
34 #include <string.h>
35 
36 static char zapchar;
37 static FILE *tf;
38 
39 static char *skip(char *);
40 static char *value(char *);
41 
42 struct ttyent *
getttynam(const char * tty)43 getttynam(const char *tty)
44 {
45 	struct ttyent *t;
46 
47 	setttyent();
48 	while ((t = getttyent()))
49 		if (!strcmp(tty, t->ty_name))
50 			break;
51 	endttyent();
52 	return (t);
53 }
54 
55 struct ttyent *
getttyent(void)56 getttyent(void)
57 {
58 	static struct ttyent tty;
59 	int c;
60 	char *p;
61 #define	MAXLINELENGTH	200
62 	static char line[MAXLINELENGTH];
63 
64 	if (!tf && !setttyent())
65 		return (NULL);
66 	for (;;) {
67 		if (!fgets(p = line, sizeof(line), tf))
68 			return (NULL);
69 		/* skip lines that are too big */
70 		if (!strchr(p, '\n')) {
71 			while ((c = getc_unlocked(tf)) != '\n' && c != EOF)
72 				;
73 			continue;
74 		}
75 		while (isspace((unsigned char)*p))
76 			++p;
77 		if (*p && *p != '#')
78 			break;
79 	}
80 
81 	zapchar = 0;
82 	tty.ty_name = p;
83 	p = skip(p);
84 	if (!*(tty.ty_getty = p))
85 		tty.ty_getty = tty.ty_type = NULL;
86 	else {
87 		p = skip(p);
88 		if (!*(tty.ty_type = p))
89 			tty.ty_type = NULL;
90 		else
91 			p = skip(p);
92 	}
93 	tty.ty_status = 0;
94 	tty.ty_window = NULL;
95 
96 #define	scmp(e)	!strncmp(p, e, sizeof(e) - 1) && \
97 		isspace((unsigned char)p[sizeof(e) - 1])
98 #define	vcmp(e)	!strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
99 	for (; *p; p = skip(p)) {
100 		if (scmp(_TTYS_OFF))
101 			tty.ty_status &= ~TTY_ON;
102 		else if (scmp(_TTYS_ON))
103 			tty.ty_status |= TTY_ON;
104 		else if (scmp(_TTYS_SECURE))
105 			tty.ty_status |= TTY_SECURE;
106 		else if (scmp(_TTYS_LOCAL))
107 			tty.ty_status |= TTY_LOCAL;
108 		else if (scmp(_TTYS_RTSCTS))
109 			tty.ty_status |= TTY_RTSCTS;
110 		else if (scmp(_TTYS_SOFTCAR))
111 			tty.ty_status |= TTY_SOFTCAR;
112 		else if (scmp(_TTYS_MDMBUF))
113 			tty.ty_status |= TTY_MDMBUF;
114 		else if (vcmp(_TTYS_WINDOW))
115 			tty.ty_window = value(p);
116 		else
117 			break;
118 	}
119 
120 	if (zapchar == '#' || *p == '#')
121 		while ((c = *++p) == ' ' || c == '\t')
122 			;
123 	tty.ty_comment = p;
124 	if (*p == 0)
125 		tty.ty_comment = 0;
126 	if ((p = strchr(p, '\n')))
127 		*p = '\0';
128 	return (&tty);
129 }
130 DEF_WEAK(getttyent);
131 
132 #define	QUOTED	1
133 
134 /*
135  * Skip over the current field, removing quotes, and return a pointer to
136  * the next field.
137  */
138 static char *
skip(char * p)139 skip(char *p)
140 {
141 	char *t;
142 	int c, q;
143 
144 	for (q = 0, t = p; (c = *p) != '\0'; p++) {
145 		if (c == '"') {
146 			q ^= QUOTED;	/* obscure, but nice */
147 			continue;
148 		}
149 		if (q == QUOTED && *p == '\\' && *(p+1) == '"')
150 			p++;
151 		*t++ = *p;
152 		if (q == QUOTED)
153 			continue;
154 		if (c == '#') {
155 			zapchar = c;
156 			*p = 0;
157 			break;
158 		}
159 		if (c == '\t' || c == ' ' || c == '\n') {
160 			zapchar = c;
161 			*p++ = 0;
162 			while ((c = *p) == '\t' || c == ' ' || c == '\n')
163 				p++;
164 			break;
165 		}
166 	}
167 	*--t = '\0';
168 	return (p);
169 }
170 
171 static char *
value(char * p)172 value(char *p)
173 {
174 
175 	return ((p = strchr(p, '=')) ? ++p : NULL);
176 }
177 
178 int
setttyent(void)179 setttyent(void)
180 {
181 
182 	if (tf) {
183 		rewind(tf);
184 		return (1);
185 	} else if ((tf = fopen(_PATH_TTYS, "re")))
186 		return (1);
187 	return (0);
188 }
189 DEF_WEAK(setttyent);
190 
191 int
endttyent(void)192 endttyent(void)
193 {
194 	int rval;
195 
196 	if (tf) {
197 		rval = !(fclose(tf) == EOF);
198 		tf = NULL;
199 		return (rval);
200 	}
201 	return (1);
202 }
203 DEF_WEAK(endttyent);
204