getttyent.c revision 1.8 1 /* $NetBSD: getttyent.c,v 1.8 1995/02/27 04:13:20 cgd Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 #if 0
38 static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93";
39 #else
40 static char rcsid[] = "$NetBSD: getttyent.c,v 1.8 1995/02/27 04:13:20 cgd Exp $";
41 #endif
42 #endif /* LIBC_SCCS and not lint */
43
44 #include <ttyent.h>
45 #include <stdio.h>
46 #include <ctype.h>
47 #include <string.h>
48
49 static char zapchar;
50 static FILE *tf;
51
52 struct ttyent *
53 getttynam(tty)
54 const char *tty;
55 {
56 register struct ttyent *t;
57
58 setttyent();
59 while (t = getttyent())
60 if (!strcmp(tty, t->ty_name))
61 break;
62 endttyent();
63 return (t);
64 }
65
66 struct ttyent *
67 getttyent()
68 {
69 static struct ttyent tty;
70 register int c;
71 register char *p;
72 #define MAXLINELENGTH 200
73 static char line[MAXLINELENGTH];
74 static char *skip(), *value();
75
76 if (!tf && !setttyent())
77 return (NULL);
78 for (;;) {
79 if (!fgets(p = line, sizeof(line), tf))
80 return (NULL);
81 /* skip lines that are too big */
82 if (!strchr(p, '\n')) {
83 while ((c = getc(tf)) != '\n' && c != EOF)
84 ;
85 continue;
86 }
87 while (isspace(*p))
88 ++p;
89 if (*p && *p != '#')
90 break;
91 }
92
93 zapchar = 0;
94 tty.ty_name = p;
95 p = skip(p);
96 if (!*(tty.ty_getty = p))
97 tty.ty_getty = tty.ty_type = NULL;
98 else {
99 p = skip(p);
100 if (!*(tty.ty_type = p))
101 tty.ty_type = NULL;
102 else
103 p = skip(p);
104 }
105 tty.ty_status = 0;
106 tty.ty_window = NULL;
107
108 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
109 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
110 for (; *p; p = skip(p)) {
111 if (scmp(_TTYS_OFF))
112 tty.ty_status &= ~TTY_ON;
113 else if (scmp(_TTYS_ON))
114 tty.ty_status |= TTY_ON;
115 else if (scmp(_TTYS_SECURE))
116 tty.ty_status |= TTY_SECURE;
117 else if (scmp(_TTYS_LOCAL))
118 tty.ty_status |= TTY_LOCAL;
119 else if (scmp(_TTYS_RTSCTS))
120 tty.ty_status |= TTY_RTSCTS;
121 else if (scmp(_TTYS_SOFTCAR))
122 tty.ty_status |= TTY_SOFTCAR;
123 else if (scmp(_TTYS_MDMBUF))
124 tty.ty_status |= TTY_MDMBUF;
125 else if (vcmp(_TTYS_WINDOW))
126 tty.ty_window = value(p);
127 else
128 break;
129 }
130
131 if (zapchar == '#' || *p == '#')
132 while ((c = *++p) == ' ' || c == '\t')
133 ;
134 tty.ty_comment = p;
135 if (*p == 0)
136 tty.ty_comment = 0;
137 if (p = strchr(p, '\n'))
138 *p = '\0';
139 return (&tty);
140 }
141
142 #define QUOTED 1
143
144 /*
145 * Skip over the current field, removing quotes, and return a pointer to
146 * the next field.
147 */
148 static char *
149 skip(p)
150 register char *p;
151 {
152 register char *t;
153 register int c, q;
154
155 for (q = 0, t = p; (c = *p) != '\0'; p++) {
156 if (c == '"') {
157 q ^= QUOTED; /* obscure, but nice */
158 continue;
159 }
160 if (q == QUOTED && *p == '\\' && *(p+1) == '"')
161 p++;
162 *t++ = *p;
163 if (q == QUOTED)
164 continue;
165 if (c == '#') {
166 zapchar = c;
167 *p = 0;
168 break;
169 }
170 if (c == '\t' || c == ' ' || c == '\n') {
171 zapchar = c;
172 *p++ = 0;
173 while ((c = *p) == '\t' || c == ' ' || c == '\n')
174 p++;
175 break;
176 }
177 }
178 *--t = '\0';
179 return (p);
180 }
181
182 static char *
183 value(p)
184 register char *p;
185 {
186
187 return ((p = strchr(p, '=')) ? ++p : NULL);
188 }
189
190 int
191 setttyent()
192 {
193
194 if (tf) {
195 (void)rewind(tf);
196 return (1);
197 } else if (tf = fopen(_PATH_TTYS, "r"))
198 return (1);
199 return (0);
200 }
201
202 int
203 endttyent()
204 {
205 int rval;
206
207 if (tf) {
208 rval = !(fclose(tf) == EOF);
209 tf = NULL;
210 return (rval);
211 }
212 return (1);
213 }
214