getttyent.c revision 1.9.4.1
1 /* $NetBSD: getttyent.c,v 1.9.4.1 1996/09/19 20:03:08 jtc Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 static char rcsid[] = "$NetBSD: getttyent.c,v 1.9.4.1 1996/09/19 20:03:08 jtc Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include "namespace.h" 45 #include <ttyent.h> 46 #include <stdio.h> 47 #include <ctype.h> 48 #include <string.h> 49 50 #ifdef __weak_alias 51 __weak_alias(endttyent,_endttyent); 52 __weak_alias(getttyent,_getttyent); 53 __weak_alias(getttynam,_getttynam); 54 __weak_alias(setttyent,_setttyent); 55 #endif 56 57 static char zapchar; 58 static FILE *tf; 59 60 struct ttyent * 61 getttynam(tty) 62 const char *tty; 63 { 64 register struct ttyent *t; 65 66 setttyent(); 67 while (t = getttyent()) 68 if (!strcmp(tty, t->ty_name)) 69 break; 70 endttyent(); 71 return (t); 72 } 73 74 struct ttyent * 75 getttyent() 76 { 77 static struct ttyent tty; 78 register int c; 79 register char *p; 80 #define MAXLINELENGTH 200 81 static char line[MAXLINELENGTH]; 82 static char *skip(), *value(); 83 84 if (!tf && !setttyent()) 85 return (NULL); 86 for (;;) { 87 if (!fgets(p = line, sizeof(line), tf)) 88 return (NULL); 89 /* skip lines that are too big */ 90 if (!strchr(p, '\n')) { 91 while ((c = getc(tf)) != '\n' && c != EOF) 92 ; 93 continue; 94 } 95 while (isspace(*p)) 96 ++p; 97 if (*p && *p != '#') 98 break; 99 } 100 101 zapchar = 0; 102 tty.ty_name = p; 103 p = skip(p); 104 if (!*(tty.ty_getty = p)) 105 tty.ty_getty = tty.ty_type = NULL; 106 else { 107 p = skip(p); 108 if (!*(tty.ty_type = p)) 109 tty.ty_type = NULL; 110 else 111 p = skip(p); 112 } 113 tty.ty_status = 0; 114 tty.ty_window = NULL; 115 116 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1]) 117 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 118 for (; *p; p = skip(p)) { 119 if (scmp(_TTYS_OFF)) 120 tty.ty_status &= ~TTY_ON; 121 else if (scmp(_TTYS_ON)) 122 tty.ty_status |= TTY_ON; 123 else if (scmp(_TTYS_SECURE)) 124 tty.ty_status |= TTY_SECURE; 125 else if (scmp(_TTYS_LOCAL)) 126 tty.ty_status |= TTY_LOCAL; 127 else if (scmp(_TTYS_RTSCTS)) 128 tty.ty_status |= TTY_RTSCTS; 129 else if (scmp(_TTYS_SOFTCAR)) 130 tty.ty_status |= TTY_SOFTCAR; 131 else if (scmp(_TTYS_MDMBUF)) 132 tty.ty_status |= TTY_MDMBUF; 133 else if (vcmp(_TTYS_WINDOW)) 134 tty.ty_window = value(p); 135 else 136 break; 137 } 138 139 if (zapchar == '#' || *p == '#') 140 while ((c = *++p) == ' ' || c == '\t') 141 ; 142 tty.ty_comment = p; 143 if (*p == 0) 144 tty.ty_comment = 0; 145 if (p = strchr(p, '\n')) 146 *p = '\0'; 147 return (&tty); 148 } 149 150 #define QUOTED 1 151 152 /* 153 * Skip over the current field, removing quotes, and return a pointer to 154 * the next field. 155 */ 156 static char * 157 skip(p) 158 register char *p; 159 { 160 register char *t; 161 register int c, q; 162 163 for (q = 0, t = p; (c = *p) != '\0'; p++) { 164 if (c == '"') { 165 q ^= QUOTED; /* obscure, but nice */ 166 continue; 167 } 168 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 169 p++; 170 *t++ = *p; 171 if (q == QUOTED) 172 continue; 173 if (c == '#') { 174 zapchar = c; 175 *p = 0; 176 break; 177 } 178 if (c == '\t' || c == ' ' || c == '\n') { 179 zapchar = c; 180 *p++ = 0; 181 while ((c = *p) == '\t' || c == ' ' || c == '\n') 182 p++; 183 break; 184 } 185 } 186 *--t = '\0'; 187 return (p); 188 } 189 190 static char * 191 value(p) 192 register char *p; 193 { 194 195 return ((p = strchr(p, '=')) ? ++p : NULL); 196 } 197 198 int 199 setttyent() 200 { 201 202 if (tf) { 203 rewind(tf); 204 return (1); 205 } else if (tf = fopen(_PATH_TTYS, "r")) 206 return (1); 207 return (0); 208 } 209 210 int 211 endttyent() 212 { 213 int rval; 214 215 if (tf) { 216 rval = !(fclose(tf) == EOF); 217 tf = NULL; 218 return (rval); 219 } 220 return (1); 221 } 222
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