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