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28f540f4 RM |
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. | |
28f540f4 RM |
13 | * 4. Neither the name of the University nor the names of its contributors |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #if defined(LIBC_SCCS) && !defined(lint) | |
31 | static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; | |
32 | #endif /* LIBC_SCCS and not lint */ | |
33 | ||
34 | #include <ttyent.h> | |
35 | #include <stdio.h> | |
2706ee38 | 36 | #include <stdio_ext.h> |
28f540f4 RM |
37 | #include <ctype.h> |
38 | #include <string.h> | |
39 | ||
3ce1f295 UD |
40 | #define flockfile(s) _IO_flockfile (s) |
41 | #define funlockfile(s) _IO_funlockfile (s) | |
50304ef0 | 42 | |
28f540f4 RM |
43 | static char zapchar; |
44 | static FILE *tf; | |
45 | ||
46 | struct ttyent * | |
47 | getttynam(tty) | |
48 | const char *tty; | |
49 | { | |
2e09a79a | 50 | struct ttyent *t; |
28f540f4 RM |
51 | |
52 | setttyent(); | |
6796bc80 | 53 | while ((t = getttyent())) |
28f540f4 RM |
54 | if (!strcmp(tty, t->ty_name)) |
55 | break; | |
56 | endttyent(); | |
57 | return (t); | |
58 | } | |
59 | ||
79937577 UD |
60 | static char *skip (char *) __THROW internal_function; |
61 | static char *value (char *) __THROW internal_function; | |
fd861379 | 62 | |
28f540f4 RM |
63 | struct ttyent * |
64 | getttyent() | |
65 | { | |
66 | static struct ttyent tty; | |
2e09a79a JM |
67 | int c; |
68 | char *p; | |
28f540f4 RM |
69 | #define MAXLINELENGTH 100 |
70 | static char line[MAXLINELENGTH]; | |
28f540f4 RM |
71 | |
72 | if (!tf && !setttyent()) | |
73 | return (NULL); | |
eb27c43f | 74 | flockfile (tf); |
28f540f4 | 75 | for (;;) { |
4bae5567 UD |
76 | if (!fgets_unlocked(p = line, sizeof(line), tf)) { |
77 | funlockfile (tf); | |
28f540f4 | 78 | return (NULL); |
4bae5567 | 79 | } |
28f540f4 RM |
80 | /* skip lines that are too big */ |
81 | if (!index(p, '\n')) { | |
eb27c43f | 82 | while ((c = getc_unlocked(tf)) != '\n' && c != EOF) |
28f540f4 RM |
83 | ; |
84 | continue; | |
85 | } | |
86 | while (isspace(*p)) | |
87 | ++p; | |
88 | if (*p && *p != '#') | |
89 | break; | |
90 | } | |
91 | ||
92 | zapchar = 0; | |
93 | tty.ty_name = p; | |
94 | p = skip(p); | |
95 | if (!*(tty.ty_getty = p)) | |
96 | tty.ty_getty = tty.ty_type = NULL; | |
97 | else { | |
98 | p = skip(p); | |
99 | if (!*(tty.ty_type = p)) | |
100 | tty.ty_type = NULL; | |
101 | else | |
102 | p = skip(p); | |
103 | } | |
104 | tty.ty_status = 0; | |
105 | tty.ty_window = NULL; | |
106 | ||
107 | #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1]) | |
108 | #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' | |
109 | for (; *p; p = skip(p)) { | |
110 | if (scmp(_TTYS_OFF)) | |
111 | tty.ty_status &= ~TTY_ON; | |
112 | else if (scmp(_TTYS_ON)) | |
113 | tty.ty_status |= TTY_ON; | |
114 | else if (scmp(_TTYS_SECURE)) | |
115 | tty.ty_status |= TTY_SECURE; | |
116 | else if (vcmp(_TTYS_WINDOW)) | |
117 | tty.ty_window = value(p); | |
118 | else | |
119 | break; | |
120 | } | |
3f933dc2 UD |
121 | /* We can release the lock only here since `zapchar' is global. */ |
122 | funlockfile(tf); | |
28f540f4 RM |
123 | |
124 | if (zapchar == '#' || *p == '#') | |
125 | while ((c = *++p) == ' ' || c == '\t') | |
126 | ; | |
127 | tty.ty_comment = p; | |
128 | if (*p == 0) | |
129 | tty.ty_comment = 0; | |
6796bc80 | 130 | if ((p = index(p, '\n'))) |
28f540f4 RM |
131 | *p = '\0'; |
132 | return (&tty); | |
133 | } | |
509d1b68 | 134 | libc_hidden_def (getttyent) |
28f540f4 RM |
135 | |
136 | #define QUOTED 1 | |
137 | ||
138 | /* | |
139 | * Skip over the current field, removing quotes, and return a pointer to | |
140 | * the next field. | |
141 | */ | |
142 | static char * | |
dfd2257a | 143 | internal_function |
28f540f4 | 144 | skip(p) |
2e09a79a | 145 | char *p; |
28f540f4 | 146 | { |
2e09a79a JM |
147 | char *t; |
148 | int c, q; | |
28f540f4 RM |
149 | |
150 | for (q = 0, t = p; (c = *p) != '\0'; p++) { | |
151 | if (c == '"') { | |
152 | q ^= QUOTED; /* obscure, but nice */ | |
153 | continue; | |
154 | } | |
155 | if (q == QUOTED && *p == '\\' && *(p+1) == '"') | |
156 | p++; | |
157 | *t++ = *p; | |
158 | if (q == QUOTED) | |
159 | continue; | |
160 | if (c == '#') { | |
161 | zapchar = c; | |
162 | *p = 0; | |
163 | break; | |
164 | } | |
165 | if (c == '\t' || c == ' ' || c == '\n') { | |
166 | zapchar = c; | |
167 | *p++ = 0; | |
168 | while ((c = *p) == '\t' || c == ' ' || c == '\n') | |
169 | p++; | |
170 | break; | |
171 | } | |
172 | } | |
173 | *--t = '\0'; | |
174 | return (p); | |
175 | } | |
176 | ||
177 | static char * | |
dfd2257a | 178 | internal_function |
28f540f4 | 179 | value(p) |
2e09a79a | 180 | char *p; |
28f540f4 RM |
181 | { |
182 | ||
183 | return ((p = index(p, '=')) ? ++p : NULL); | |
184 | } | |
185 | ||
186 | int | |
187 | setttyent() | |
188 | { | |
189 | ||
190 | if (tf) { | |
191 | (void)rewind(tf); | |
192 | return (1); | |
312be3f9 | 193 | } else if ((tf = fopen(_PATH_TTYS, "rce"))) { |
2706ee38 UD |
194 | /* We do the locking ourselves. */ |
195 | __fsetlocking (tf, FSETLOCKING_BYCALLER); | |
28f540f4 | 196 | return (1); |
2706ee38 | 197 | } |
28f540f4 RM |
198 | return (0); |
199 | } | |
509d1b68 | 200 | libc_hidden_def (setttyent) |
28f540f4 RM |
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 | } | |
509d1b68 | 214 | libc_hidden_def (endttyent) |