getttyent.c revision 1.10
1 /* $NetBSD: getttyent.c,v 1.10 1997/07/13 19:14:35 christos 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 1.10 1997/07/13 19:14:35 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <ttyent.h> 46 #include <stdio.h> 47 #include <ctype.h> 48 #include <string.h> 49 50 static char zapchar; 51 static FILE *tf; 52 static char *skip __P((char *)); 53 static char *value __P((char *)); 54 55 struct ttyent * 56 getttynam(tty) 57 const char *tty; 58 { 59 register struct ttyent *t; 60 61 setttyent(); 62 while ((t = getttyent()) != NULL) 63 if (!strcmp(tty, t->ty_name)) 64 break; 65 endttyent(); 66 return (t); 67 } 68 69 struct ttyent * 70 getttyent() 71 { 72 static struct ttyent tty; 73 register int c; 74 register char *p; 75 #define MAXLINELENGTH 200 76 static char line[MAXLINELENGTH]; 77 78 if (!tf && !setttyent()) 79 return (NULL); 80 for (;;) { 81 if (!fgets(p = line, sizeof(line), tf)) 82 return (NULL); 83 /* skip lines that are too big */ 84 if (!strchr(p, '\n')) { 85 while ((c = getc(tf)) != '\n' && c != EOF) 86 ; 87 continue; 88 } 89 while (isspace(*p)) 90 ++p; 91 if (*p && *p != '#') 92 break; 93 } 94 95 zapchar = 0; 96 tty.ty_name = p; 97 p = skip(p); 98 if (!*(tty.ty_getty = p)) 99 tty.ty_getty = tty.ty_type = NULL; 100 else { 101 p = skip(p); 102 if (!*(tty.ty_type = p)) 103 tty.ty_type = NULL; 104 else 105 p = skip(p); 106 } 107 tty.ty_status = 0; 108 tty.ty_window = NULL; 109 110 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1]) 111 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 112 for (; *p; p = skip(p)) { 113 if (scmp(_TTYS_OFF)) 114 tty.ty_status &= ~TTY_ON; 115 else if (scmp(_TTYS_ON)) 116 tty.ty_status |= TTY_ON; 117 else if (scmp(_TTYS_SECURE)) 118 tty.ty_status |= TTY_SECURE; 119 else if (scmp(_TTYS_LOCAL)) 120 tty.ty_status |= TTY_LOCAL; 121 else if (scmp(_TTYS_RTSCTS)) 122 tty.ty_status |= TTY_RTSCTS; 123 else if (scmp(_TTYS_SOFTCAR)) 124 tty.ty_status |= TTY_SOFTCAR; 125 else if (scmp(_TTYS_MDMBUF)) 126 tty.ty_status |= TTY_MDMBUF; 127 else if (vcmp(_TTYS_WINDOW)) 128 tty.ty_window = value(p); 129 else 130 break; 131 } 132 133 if (zapchar == '#' || *p == '#') 134 while ((c = *++p) == ' ' || c == '\t') 135 ; 136 tty.ty_comment = p; 137 if (*p == 0) 138 tty.ty_comment = 0; 139 if ((p = strchr(p, '\n')) != NULL) 140 *p = '\0'; 141 return (&tty); 142 } 143 144 #define QUOTED 1 145 146 /* 147 * Skip over the current field, removing quotes, and return a pointer to 148 * the next field. 149 */ 150 static char * 151 skip(p) 152 register char *p; 153 { 154 register char *t; 155 register int c, q; 156 157 for (q = 0, t = p; (c = *p) != '\0'; p++) { 158 if (c == '"') { 159 q ^= QUOTED; /* obscure, but nice */ 160 continue; 161 } 162 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 163 p++; 164 *t++ = *p; 165 if (q == QUOTED) 166 continue; 167 if (c == '#') { 168 zapchar = c; 169 *p = 0; 170 break; 171 } 172 if (c == '\t' || c == ' ' || c == '\n') { 173 zapchar = c; 174 *p++ = 0; 175 while ((c = *p) == '\t' || c == ' ' || c == '\n') 176 p++; 177 break; 178 } 179 } 180 *--t = '\0'; 181 return (p); 182 } 183 184 static char * 185 value(p) 186 register char *p; 187 { 188 189 return ((p = strchr(p, '=')) ? ++p : NULL); 190 } 191 192 int 193 setttyent() 194 { 195 196 if (tf) { 197 rewind(tf); 198 return (1); 199 } else if ((tf = fopen(_PATH_TTYS, "r")) != NULL) 200 return (1); 201 return (0); 202 } 203 204 int 205 endttyent() 206 { 207 int rval; 208 209 if (tf) { 210 rval = !(fclose(tf) == EOF); 211 tf = NULL; 212 return (rval); 213 } 214 return (1); 215 } 216
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