1 /* $NetBSD: getttyent.c,v 1.18 2000/07/07 08:03:37 itohy 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 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: getttyent.c,v 1.18 2000/07/07 08:03:37 itohy Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 47 #include <assert.h> 48 #include <ctype.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <ttyent.h> 52 53 #ifdef __weak_alias 54 __weak_alias(endttyent,_endttyent) 55 __weak_alias(getttyent,_getttyent) 56 __weak_alias(getttynam,_getttynam) 57 __weak_alias(setttyent,_setttyent) 58 #endif 59 60 static char zapchar; 61 static FILE *tf; 62 static char *skip __P((char *)); 63 static char *value __P((char *)); 64 65 struct ttyent * 66 getttynam(tty) 67 const char *tty; 68 { 69 struct ttyent *t; 70 71 _DIAGASSERT(tty != NULL); 72 73 setttyent(); 74 while ((t = getttyent()) != NULL) 75 if (!strcmp(tty, t->ty_name)) 76 break; 77 endttyent(); 78 return (t); 79 } 80 81 struct ttyent * 82 getttyent() 83 { 84 static struct ttyent tty; 85 int c; 86 char *p; 87 #define MAXLINELENGTH 200 88 static char line[MAXLINELENGTH]; 89 90 if (!tf && !setttyent()) 91 return (NULL); 92 for (;;) { 93 if (!fgets(p = line, sizeof(line), tf)) 94 return (NULL); 95 /* skip lines that are too big */ 96 if (!strchr(p, '\n')) { 97 while ((c = getc(tf)) != '\n' && c != EOF) 98 ; 99 continue; 100 } 101 while (isspace((unsigned char) *p)) 102 ++p; 103 if (*p && *p != '#') 104 break; 105 } 106 107 zapchar = 0; 108 tty.ty_name = p; 109 p = skip(p); 110 if (!*(tty.ty_getty = p)) 111 tty.ty_getty = tty.ty_type = NULL; 112 else { 113 p = skip(p); 114 if (!*(tty.ty_type = p)) 115 tty.ty_type = NULL; 116 else 117 p = skip(p); 118 } 119 tty.ty_status = 0; 120 tty.ty_window = NULL; 121 122 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char) p[sizeof(e) - 1]) 123 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 124 for (; *p; p = skip(p)) { 125 if (scmp(_TTYS_OFF)) 126 tty.ty_status &= ~TTY_ON; 127 else if (scmp(_TTYS_ON)) 128 tty.ty_status |= TTY_ON; 129 else if (scmp(_TTYS_SECURE)) 130 tty.ty_status |= TTY_SECURE; 131 else if (scmp(_TTYS_LOCAL)) 132 tty.ty_status |= TTY_LOCAL; 133 else if (scmp(_TTYS_RTSCTS)) 134 tty.ty_status |= TTY_RTSCTS; 135 else if (scmp(_TTYS_DTRCTS)) 136 tty.ty_status |= TTY_DTRCTS; 137 else if (scmp(_TTYS_SOFTCAR)) 138 tty.ty_status |= TTY_SOFTCAR; 139 else if (scmp(_TTYS_MDMBUF)) 140 tty.ty_status |= TTY_MDMBUF; 141 else if (vcmp(_TTYS_WINDOW)) 142 tty.ty_window = value(p); 143 else if (vcmp(_TTYS_CLASS)) 144 tty.ty_class = value(p); 145 else 146 break; 147 } 148 149 if (zapchar == '#' || *p == '#') 150 while ((c = *++p) == ' ' || c == '\t') 151 ; 152 tty.ty_comment = p; 153 if (*p == 0) 154 tty.ty_comment = 0; 155 if ((p = strchr(p, '\n')) != NULL) 156 *p = '\0'; 157 return (&tty); 158 } 159 160 #define QUOTED 1 161 162 /* 163 * Skip over the current field, removing quotes, and return a pointer to 164 * the next field. 165 */ 166 static char * 167 skip(p) 168 char *p; 169 { 170 char *t; 171 int c, q; 172 173 _DIAGASSERT(p != NULL); 174 175 for (q = 0, t = p; (c = *p) != '\0'; p++) { 176 if (c == '"') { 177 q ^= QUOTED; /* obscure, but nice */ 178 continue; 179 } 180 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 181 p++; 182 *t++ = *p; 183 if (q == QUOTED) 184 continue; 185 if (c == '#') { 186 zapchar = c; 187 *p = 0; 188 break; 189 } 190 if (c == '\t' || c == ' ' || c == '\n') { 191 zapchar = c; 192 *p++ = 0; 193 while ((c = *p) == '\t' || c == ' ' || c == '\n') 194 p++; 195 break; 196 } 197 } 198 *--t = '\0'; 199 return (p); 200 } 201 202 static char * 203 value(p) 204 char *p; 205 { 206 207 _DIAGASSERT(p != NULL); 208 209 return ((p = strchr(p, '=')) ? ++p : NULL); 210 } 211 212 int 213 setttyent() 214 { 215 216 if (tf) { 217 rewind(tf); 218 return (1); 219 } else if ((tf = fopen(_PATH_TTYS, "r")) != NULL) 220 return (1); 221 return (0); 222 } 223 224 int 225 endttyent() 226 { 227 int rval; 228 229 if (tf) { 230 rval = !(fclose(tf) == EOF); 231 tf = NULL; 232 return (rval); 233 } 234 return (1); 235 } 236