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 = "from: @(#)getttyent.c 5.10 (Berkeley) 3/23/91";*/ 36 static char *rcsid = "$Id: getttyent.c,v 1.3 1993/08/26 00:44:44 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <ttyent.h> 40 #include <stdio.h> 41 #include <ctype.h> 42 #include <string.h> 43 44 static char zapchar; 45 static FILE *tf; 46 47 struct ttyent * 48 getttynam(tty) 49 const char *tty; 50 { 51 register struct ttyent *t; 52 53 setttyent(); 54 while (t = getttyent()) 55 if (!strcmp(tty, t->ty_name)) 56 break; 57 endttyent(); 58 return (t); 59 } 60 61 struct ttyent * 62 getttyent() 63 { 64 static struct ttyent tty; 65 register int c; 66 register char *p; 67 #define MAXLINELENGTH 100 68 static char line[MAXLINELENGTH]; 69 static char *skip(), *value(); 70 71 if (!tf && !setttyent()) 72 return (NULL); 73 for (;;) { 74 if (!fgets(p = line, sizeof(line), tf)) 75 return (NULL); 76 /* skip lines that are too big */ 77 if (!index(p, '\n')) { 78 while ((c = getc(tf)) != '\n' && c != EOF) 79 ; 80 continue; 81 } 82 while (isspace(*p)) 83 ++p; 84 if (*p && *p != '#') 85 break; 86 } 87 88 zapchar = 0; 89 tty.ty_name = p; 90 p = skip(p); 91 if (!*(tty.ty_getty = p)) 92 tty.ty_getty = tty.ty_type = NULL; 93 else { 94 p = skip(p); 95 if (!*(tty.ty_type = p)) 96 tty.ty_type = NULL; 97 else 98 p = skip(p); 99 } 100 tty.ty_status = 0; 101 tty.ty_window = NULL; 102 103 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1]) 104 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 105 for (; *p; p = skip(p)) { 106 if (scmp(_TTYS_OFF)) 107 tty.ty_status &= ~TTY_ON; 108 else if (scmp(_TTYS_ON)) 109 tty.ty_status |= TTY_ON; 110 else if (scmp(_TTYS_SECURE)) 111 tty.ty_status |= TTY_SECURE; 112 else if (vcmp(_TTYS_WINDOW)) 113 tty.ty_window = value(p); 114 else 115 break; 116 } 117 118 if (zapchar == '#' || *p == '#') 119 while ((c = *++p) == ' ' || c == '\t') 120 ; 121 tty.ty_comment = p; 122 if (*p == 0) 123 tty.ty_comment = 0; 124 if (p = index(p, '\n')) 125 *p = '\0'; 126 return (&tty); 127 } 128 129 #define QUOTED 1 130 131 /* 132 * Skip over the current field, removing quotes, and return a pointer to 133 * the next field. 134 */ 135 static char * 136 skip(p) 137 register char *p; 138 { 139 register char *t; 140 register int c, q; 141 142 for (q = 0, t = p; (c = *p) != '\0'; p++) { 143 if (c == '"') { 144 q ^= QUOTED; /* obscure, but nice */ 145 continue; 146 } 147 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 148 p++; 149 *t++ = *p; 150 if (q == QUOTED) 151 continue; 152 if (c == '#') { 153 zapchar = c; 154 *p = 0; 155 break; 156 } 157 if (c == '\t' || c == ' ' || c == '\n') { 158 zapchar = c; 159 *p++ = 0; 160 while ((c = *p) == '\t' || c == ' ' || c == '\n') 161 p++; 162 break; 163 } 164 } 165 *--t = '\0'; 166 return (p); 167 } 168 169 static char * 170 value(p) 171 register char *p; 172 { 173 174 return ((p = index(p, '=')) ? ++p : NULL); 175 } 176 177 int 178 setttyent() 179 { 180 181 if (tf) { 182 (void)rewind(tf); 183 return (1); 184 } else if (tf = fopen(_PATH_TTYS, "r")) 185 return (1); 186 return (0); 187 } 188 189 int 190 endttyent() 191 { 192 int rval; 193 194 if (tf) { 195 rval = !(fclose(tf) == EOF); 196 tf = NULL; 197 return (rval); 198 } 199 return (1); 200 } 201