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. 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 8.1 (Berkeley) 6/4/93"; 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 } 200