getttyent.c revision 52856
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: head/lib/libc/gen/getttyent.c 52856 1999-11-04 04:16:28Z ache $ 34 */ 35 36#if defined(LIBC_SCCS) && !defined(lint) 37static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 38#endif /* LIBC_SCCS and not lint */ 39 40#include <ttyent.h> 41#include <stdio.h> 42#include <stdlib.h> 43#include <ctype.h> 44#include <string.h> 45 46static char zapchar; 47static FILE *tf; 48static size_t lbsize; 49static char *line; 50 51#define MALLOCCHUNK 100 52 53static char *skip __P((char *)); 54static char *value __P((char *)); 55 56struct ttyent * 57getttynam(tty) 58 const char *tty; 59{ 60 register struct ttyent *t; 61 62 if (strncmp(tty, "/dev/", 5) == 0) 63 tty += 5; 64 setttyent(); 65 while ( (t = getttyent()) ) 66 if (!strcmp(tty, t->ty_name)) 67 break; 68 endttyent(); 69 return (t); 70} 71 72struct ttyent * 73getttyent() 74{ 75 static struct ttyent tty; 76 register char *p; 77 register int c; 78 size_t i; 79 80 if (!tf && !setttyent()) 81 return (NULL); 82 for (;;) { 83 if (!fgets(p = line, lbsize, tf)) 84 return (NULL); 85 /* extend buffer if line was too big, and retry */ 86 while (!index(p, '\n')) { 87 i = strlen(p); 88 lbsize += MALLOCCHUNK; 89 if ((p = realloc(line, lbsize)) == NULL) { 90 (void)endttyent(); 91 return (NULL); 92 } 93 line = p; 94 if (!fgets(&line[i], lbsize - i, tf)) 95 return (NULL); 96 } 97 while (isspace((unsigned char)*p)) 98 ++p; 99 if (*p && *p != '#') 100 break; 101 } 102 103#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 104#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 105 106 zapchar = 0; 107 tty.ty_name = p; 108 p = skip(p); 109 if (!*(tty.ty_getty = p)) 110 tty.ty_getty = tty.ty_type = NULL; 111 else { 112 p = skip(p); 113 if (!*(tty.ty_type = p)) 114 tty.ty_type = NULL; 115 else { 116 /* compatibility kludge: handle network/dialup specially */ 117 if (scmp(_TTYS_DIALUP)) 118 tty.ty_status |= TTY_DIALUP; 119 else if (scmp(_TTYS_NETWORK)) 120 tty.ty_status |= TTY_NETWORK; 121 p = skip(p); 122 } 123 } 124 tty.ty_status = 0; 125 tty.ty_window = NULL; 126 tty.ty_group = _TTYS_NOGROUP; 127 128 for (; *p; p = skip(p)) { 129 if (scmp(_TTYS_OFF)) 130 tty.ty_status &= ~TTY_ON; 131 else if (scmp(_TTYS_ON)) 132 tty.ty_status |= TTY_ON; 133 else if (scmp(_TTYS_SECURE)) 134 tty.ty_status |= TTY_SECURE; 135 else if (scmp(_TTYS_INSECURE)) 136 tty.ty_status &= ~TTY_SECURE; 137 else if (scmp(_TTYS_DIALUP)) 138 tty.ty_status |= TTY_DIALUP; 139 else if (scmp(_TTYS_NETWORK)) 140 tty.ty_status |= TTY_NETWORK; 141 else if (vcmp(_TTYS_WINDOW)) 142 tty.ty_window = value(p); 143 else if (vcmp(_TTYS_GROUP)) 144 tty.ty_group = 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 = index(p, '\n')) ) 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 */ 166static char * 167skip(p) 168 register char *p; 169{ 170 register char *t; 171 register int c, q; 172 173 for (q = 0, t = p; (c = *p) != '\0'; p++) { 174 if (c == '"') { 175 q ^= QUOTED; /* obscure, but nice */ 176 continue; 177 } 178 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 179 p++; 180 *t++ = *p; 181 if (q == QUOTED) 182 continue; 183 if (c == '#') { 184 zapchar = c; 185 *p = 0; 186 break; 187 } 188 if (c == '\t' || c == ' ' || c == '\n') { 189 zapchar = c; 190 *p++ = 0; 191 while ((c = *p) == '\t' || c == ' ' || c == '\n') 192 p++; 193 break; 194 } 195 } 196 *--t = '\0'; 197 return (p); 198} 199 200static char * 201value(p) 202 register char *p; 203{ 204 205 return ((p = index(p, '=')) ? ++p : NULL); 206} 207 208int 209setttyent() 210{ 211 212 if (line == NULL) { 213 if ((line = malloc(MALLOCCHUNK)) == NULL) 214 return (0); 215 lbsize = MALLOCCHUNK; 216 } 217 if (tf) { 218 rewind(tf); 219 return (1); 220 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 221 return (1); 222 return (0); 223} 224 225int 226endttyent() 227{ 228 int rval; 229 230 /* 231 * NB: Don't free `line' because getttynam() 232 * may still be referencing it 233 */ 234 if (tf) { 235 rval = (fclose(tf) != EOF); 236 tf = NULL; 237 return (rval); 238 } 239 return (1); 240} 241 242static int 243isttystat(tty, flag) 244 const char *tty; 245 int flag; 246{ 247 register struct ttyent *t; 248 249 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 250} 251 252 253int 254isdialuptty(tty) 255 const char *tty; 256{ 257 258 return isttystat(tty, TTY_DIALUP); 259} 260 261int isnettty(tty) 262 const char *tty; 263{ 264 265 return isttystat(tty, TTY_NETWORK); 266} 267