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8168e750 WJ |
1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * 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[] = "@(#)getttyent.c 5.10 (Berkeley) 3/23/91"; | |
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 | ||
43 | static char zapchar; | |
44 | static FILE *tf; | |
45 | ||
46 | struct ttyent * | |
47 | getttynam(tty) | |
48 | const char *tty; | |
49 | { | |
50 | register struct ttyent *t; | |
51 | ||
52 | setttyent(); | |
53 | while (t = getttyent()) | |
54 | if (!strcmp(tty, t->ty_name)) | |
55 | break; | |
56 | endttyent(); | |
57 | return (t); | |
58 | } | |
59 | ||
60 | struct ttyent * | |
61 | getttyent() | |
62 | { | |
63 | static struct ttyent tty; | |
64 | register int c; | |
65 | register char *p; | |
66 | #define MAXLINELENGTH 100 | |
67 | static char line[MAXLINELENGTH]; | |
68 | static char *skip(), *value(); | |
69 | ||
70 | if (!tf && !setttyent()) | |
71 | return (NULL); | |
72 | for (;;) { | |
73 | if (!fgets(p = line, sizeof(line), tf)) | |
74 | return (NULL); | |
75 | /* skip lines that are too big */ | |
76 | if (!index(p, '\n')) { | |
77 | while ((c = getc(tf)) != '\n' && c != EOF) | |
78 | ; | |
79 | continue; | |
80 | } | |
81 | while (isspace(*p)) | |
82 | ++p; | |
83 | if (*p && *p != '#') | |
84 | break; | |
85 | } | |
86 | ||
87 | zapchar = 0; | |
88 | tty.ty_name = p; | |
89 | p = skip(p); | |
90 | if (!*(tty.ty_getty = p)) | |
91 | tty.ty_getty = tty.ty_type = NULL; | |
92 | else { | |
93 | p = skip(p); | |
94 | if (!*(tty.ty_type = p)) | |
95 | tty.ty_type = NULL; | |
96 | else | |
97 | p = skip(p); | |
98 | } | |
99 | tty.ty_status = 0; | |
100 | tty.ty_window = NULL; | |
101 | ||
102 | #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1]) | |
103 | #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' | |
104 | for (; *p; p = skip(p)) { | |
105 | if (scmp(_TTYS_OFF)) | |
106 | tty.ty_status &= ~TTY_ON; | |
107 | else if (scmp(_TTYS_ON)) | |
108 | tty.ty_status |= TTY_ON; | |
109 | else if (scmp(_TTYS_SECURE)) | |
110 | tty.ty_status |= TTY_SECURE; | |
111 | else if (vcmp(_TTYS_WINDOW)) | |
112 | tty.ty_window = value(p); | |
113 | else | |
114 | break; | |
115 | } | |
116 | ||
117 | if (zapchar == '#' || *p == '#') | |
118 | while ((c = *++p) == ' ' || c == '\t') | |
119 | ; | |
120 | tty.ty_comment = p; | |
121 | if (*p == 0) | |
122 | tty.ty_comment = 0; | |
123 | if (p = index(p, '\n')) | |
124 | *p = '\0'; | |
125 | return (&tty); | |
126 | } | |
127 | ||
128 | #define QUOTED 1 | |
129 | ||
130 | /* | |
131 | * Skip over the current field, removing quotes, and return a pointer to | |
132 | * the next field. | |
133 | */ | |
134 | static char * | |
135 | skip(p) | |
136 | register char *p; | |
137 | { | |
138 | register char *t; | |
139 | register int c, q; | |
140 | ||
141 | for (q = 0, t = p; (c = *p) != '\0'; p++) { | |
142 | if (c == '"') { | |
143 | q ^= QUOTED; /* obscure, but nice */ | |
144 | continue; | |
145 | } | |
146 | if (q == QUOTED && *p == '\\' && *(p+1) == '"') | |
147 | p++; | |
148 | *t++ = *p; | |
149 | if (q == QUOTED) | |
150 | continue; | |
151 | if (c == '#') { | |
152 | zapchar = c; | |
153 | *p = 0; | |
154 | break; | |
155 | } | |
156 | if (c == '\t' || c == ' ' || c == '\n') { | |
157 | zapchar = c; | |
158 | *p++ = 0; | |
159 | while ((c = *p) == '\t' || c == ' ' || c == '\n') | |
160 | p++; | |
161 | break; | |
162 | } | |
163 | } | |
164 | *--t = '\0'; | |
165 | return (p); | |
166 | } | |
167 | ||
168 | static char * | |
169 | value(p) | |
170 | register char *p; | |
171 | { | |
172 | ||
173 | return ((p = index(p, '=')) ? ++p : NULL); | |
174 | } | |
175 | ||
176 | int | |
177 | setttyent() | |
178 | { | |
179 | ||
180 | if (tf) { | |
181 | (void)rewind(tf); | |
182 | return (1); | |
183 | } else if (tf = fopen(_PATH_TTYS, "r")) | |
184 | return (1); | |
185 | return (0); | |
186 | } | |
187 | ||
188 | int | |
189 | endttyent() | |
190 | { | |
191 | int rval; | |
192 | ||
193 | if (tf) { | |
194 | rval = !(fclose(tf) == EOF); | |
195 | tf = NULL; | |
196 | return (rval); | |
197 | } | |
198 | return (1); | |
199 | } |