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 * $FreeBSD: src/lib/libc/gen/getttyent.c,v 1.11 1999/11/04 04:16:27 ache Exp $ 34 * $DragonFly: src/lib/libc/gen/getttyent.c,v 1.3 2003/11/12 20:21:23 eirikn Exp $ 35 * 36 * @(#)getttyent.c 8.1 (Berkeley) 6/4/93 37 */ 38 39 #include <ttyent.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <ctype.h> 43 #include <string.h> 44 45 static char zapchar; 46 static FILE *tf; 47 static size_t lbsize; 48 static char *line; 49 50 #define MALLOCCHUNK 100 51 52 static char *skip (char *); 53 static char *value (char *); 54 55 struct ttyent * 56 getttynam(tty) 57 const char *tty; 58 { 59 register struct ttyent *t; 60 61 if (strncmp(tty, "/dev/", 5) == 0) 62 tty += 5; 63 setttyent(); 64 while ( (t = getttyent()) ) 65 if (!strcmp(tty, t->ty_name)) 66 break; 67 endttyent(); 68 return (t); 69 } 70 71 struct ttyent * 72 getttyent() 73 { 74 static struct ttyent tty; 75 register char *p; 76 register int c; 77 size_t i; 78 79 if (!tf && !setttyent()) 80 return (NULL); 81 for (;;) { 82 if (!fgets(p = line, lbsize, tf)) 83 return (NULL); 84 /* extend buffer if line was too big, and retry */ 85 while (!index(p, '\n')) { 86 i = strlen(p); 87 lbsize += MALLOCCHUNK; 88 if ((p = realloc(line, lbsize)) == NULL) { 89 (void)endttyent(); 90 return (NULL); 91 } 92 line = p; 93 if (!fgets(&line[i], lbsize - i, tf)) 94 return (NULL); 95 } 96 while (isspace((unsigned char)*p)) 97 ++p; 98 if (*p && *p != '#') 99 break; 100 } 101 102 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 103 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 104 105 zapchar = 0; 106 tty.ty_name = p; 107 p = skip(p); 108 if (!*(tty.ty_getty = p)) 109 tty.ty_getty = tty.ty_type = NULL; 110 else { 111 p = skip(p); 112 if (!*(tty.ty_type = p)) 113 tty.ty_type = NULL; 114 else { 115 /* compatibility kludge: handle network/dialup specially */ 116 if (scmp(_TTYS_DIALUP)) 117 tty.ty_status |= TTY_DIALUP; 118 else if (scmp(_TTYS_NETWORK)) 119 tty.ty_status |= TTY_NETWORK; 120 p = skip(p); 121 } 122 } 123 tty.ty_status = 0; 124 tty.ty_window = NULL; 125 tty.ty_group = _TTYS_NOGROUP; 126 127 for (; *p; p = skip(p)) { 128 if (scmp(_TTYS_OFF)) 129 tty.ty_status &= ~TTY_ON; 130 else if (scmp(_TTYS_ON)) 131 tty.ty_status |= TTY_ON; 132 else if (scmp(_TTYS_SECURE)) 133 tty.ty_status |= TTY_SECURE; 134 else if (scmp(_TTYS_INSECURE)) 135 tty.ty_status &= ~TTY_SECURE; 136 else if (scmp(_TTYS_DIALUP)) 137 tty.ty_status |= TTY_DIALUP; 138 else if (scmp(_TTYS_NETWORK)) 139 tty.ty_status |= TTY_NETWORK; 140 else if (vcmp(_TTYS_WINDOW)) 141 tty.ty_window = value(p); 142 else if (vcmp(_TTYS_GROUP)) 143 tty.ty_group = value(p); 144 else 145 break; 146 } 147 148 if (zapchar == '#' || *p == '#') 149 while ((c = *++p) == ' ' || c == '\t') 150 ; 151 tty.ty_comment = p; 152 if (*p == 0) 153 tty.ty_comment = 0; 154 if ( (p = index(p, '\n')) ) 155 *p = '\0'; 156 return (&tty); 157 } 158 159 #define QUOTED 1 160 161 /* 162 * Skip over the current field, removing quotes, and return a pointer to 163 * the next field. 164 */ 165 static char * 166 skip(p) 167 register char *p; 168 { 169 register char *t; 170 register int c, q; 171 172 for (q = 0, t = p; (c = *p) != '\0'; p++) { 173 if (c == '"') { 174 q ^= QUOTED; /* obscure, but nice */ 175 continue; 176 } 177 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 178 p++; 179 *t++ = *p; 180 if (q == QUOTED) 181 continue; 182 if (c == '#') { 183 zapchar = c; 184 *p = 0; 185 break; 186 } 187 if (c == '\t' || c == ' ' || c == '\n') { 188 zapchar = c; 189 *p++ = 0; 190 while ((c = *p) == '\t' || c == ' ' || c == '\n') 191 p++; 192 break; 193 } 194 } 195 *--t = '\0'; 196 return (p); 197 } 198 199 static char * 200 value(p) 201 register char *p; 202 { 203 204 return ((p = index(p, '=')) ? ++p : NULL); 205 } 206 207 int 208 setttyent() 209 { 210 211 if (line == NULL) { 212 if ((line = malloc(MALLOCCHUNK)) == NULL) 213 return (0); 214 lbsize = MALLOCCHUNK; 215 } 216 if (tf) { 217 rewind(tf); 218 return (1); 219 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 220 return (1); 221 return (0); 222 } 223 224 int 225 endttyent() 226 { 227 int rval; 228 229 /* 230 * NB: Don't free `line' because getttynam() 231 * may still be referencing it 232 */ 233 if (tf) { 234 rval = (fclose(tf) != EOF); 235 tf = NULL; 236 return (rval); 237 } 238 return (1); 239 } 240 241 static int 242 isttystat(tty, flag) 243 const char *tty; 244 int flag; 245 { 246 register struct ttyent *t; 247 248 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 249 } 250 251 252 int 253 isdialuptty(tty) 254 const char *tty; 255 { 256 257 return isttystat(tty, TTY_DIALUP); 258 } 259 260 int isnettty(tty) 261 const char *tty; 262 { 263 264 return isttystat(tty, TTY_NETWORK); 265 } 266