getttyent.c revision 148401
1191783Srmacklem/* 2191783Srmacklem * Copyright (c) 1989, 1993 3191783Srmacklem * The Regents of the University of California. All rights reserved. 4191783Srmacklem * 5191783Srmacklem * Redistribution and use in source and binary forms, with or without 6191783Srmacklem * modification, are permitted provided that the following conditions 7191783Srmacklem * are met: 8191783Srmacklem * 1. Redistributions of source code must retain the above copyright 9191783Srmacklem * notice, this list of conditions and the following disclaimer. 10191783Srmacklem * 2. Redistributions in binary form must reproduce the above copyright 11191783Srmacklem * notice, this list of conditions and the following disclaimer in the 12191783Srmacklem * documentation and/or other materials provided with the distribution. 13191783Srmacklem * 3. All advertising materials mentioning features or use of this software 14191783Srmacklem * must display the following acknowledgement: 15191783Srmacklem * This product includes software developed by the University of 16191783Srmacklem * California, Berkeley and its contributors. 17191783Srmacklem * 4. Neither the name of the University nor the names of its contributors 18191783Srmacklem * may be used to endorse or promote products derived from this software 19191783Srmacklem * without specific prior written permission. 20191783Srmacklem * 21191783Srmacklem * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22191783Srmacklem * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23191783Srmacklem * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24191783Srmacklem * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25191783Srmacklem * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26191783Srmacklem * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27191783Srmacklem * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28191783Srmacklem * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29191783Srmacklem * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30191783Srmacklem * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31191783Srmacklem * SUCH DAMAGE. 32191783Srmacklem */ 33191783Srmacklem 34191783Srmacklem#if defined(LIBC_SCCS) && !defined(lint) 35191783Srmacklemstatic char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 36191783Srmacklem#endif /* LIBC_SCCS and not lint */ 37191783Srmacklem#include <sys/cdefs.h> 38191783Srmacklem__FBSDID("$FreeBSD: head/lib/libc/gen/getttyent.c 148401 2005-07-25 17:57:15Z mdodd $"); 39191783Srmacklem 40191783Srmacklem#include <ttyent.h> 41191783Srmacklem#include <stdio.h> 42191783Srmacklem#include <stdlib.h> 43191783Srmacklem#include <ctype.h> 44191783Srmacklem#include <string.h> 45191783Srmacklem 46191783Srmacklemstatic char zapchar; 47191783Srmacklemstatic FILE *tf; 48191783Srmacklemstatic size_t lbsize; 49191783Srmacklemstatic char *line; 50191783Srmacklem 51191783Srmacklem#define MALLOCCHUNK 100 52191783Srmacklem 53191783Srmacklemstatic char *skip(char *); 54191783Srmacklemstatic char *value(char *); 55191783Srmacklem 56191783Srmacklemstruct ttyent * 57191783Srmacklemgetttynam(tty) 58191783Srmacklem const char *tty; 59191783Srmacklem{ 60191783Srmacklem struct ttyent *t; 61191783Srmacklem 62191783Srmacklem if (strncmp(tty, "/dev/", 5) == 0) 63191783Srmacklem tty += 5; 64191783Srmacklem setttyent(); 65191783Srmacklem while ( (t = getttyent()) ) 66191783Srmacklem if (!strcmp(tty, t->ty_name)) 67191783Srmacklem break; 68191783Srmacklem endttyent(); 69191783Srmacklem return (t); 70191783Srmacklem} 71191783Srmacklem 72191783Srmacklemstruct ttyent * 73191783Srmacklemgetttyent() 74191783Srmacklem{ 75191783Srmacklem static struct ttyent tty; 76191783Srmacklem char *p; 77191783Srmacklem int c; 78191783Srmacklem size_t i; 79191783Srmacklem 80191783Srmacklem if (!tf && !setttyent()) 81191783Srmacklem return (NULL); 82191783Srmacklem for (;;) { 83191783Srmacklem if (!fgets(p = line, lbsize, tf)) 84191783Srmacklem return (NULL); 85191783Srmacklem /* extend buffer if line was too big, and retry */ 86191783Srmacklem while (!index(p, '\n')) { 87192115Srmacklem i = strlen(p); 88191783Srmacklem lbsize += MALLOCCHUNK; 89191783Srmacklem if ((p = realloc(line, lbsize)) == NULL) { 90191783Srmacklem (void)endttyent(); 91191783Srmacklem return (NULL); 92191783Srmacklem } 93191783Srmacklem line = p; 94191783Srmacklem if (!fgets(&line[i], lbsize - i, tf)) 95191783Srmacklem return (NULL); 96191783Srmacklem } 97191783Srmacklem while (isspace((unsigned char)*p)) 98191783Srmacklem ++p; 99191783Srmacklem if (*p && *p != '#') 100191783Srmacklem break; 101191783Srmacklem } 102191783Srmacklem 103191783Srmacklem#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 104191783Srmacklem#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 105191783Srmacklem 106191783Srmacklem zapchar = 0; 107191783Srmacklem tty.ty_name = p; 108191783Srmacklem tty.ty_status = 0; 109191783Srmacklem tty.ty_window = NULL; 110191783Srmacklem tty.ty_group = _TTYS_NOGROUP; 111191783Srmacklem 112191783Srmacklem p = skip(p); 113191783Srmacklem if (!*(tty.ty_getty = p)) 114191783Srmacklem tty.ty_getty = tty.ty_type = NULL; 115191783Srmacklem else { 116191783Srmacklem p = skip(p); 117191783Srmacklem if (!*(tty.ty_type = p)) 118191783Srmacklem tty.ty_type = NULL; 119191783Srmacklem else { 120191783Srmacklem /* compatibility kludge: handle network/dialup specially */ 121191783Srmacklem if (scmp(_TTYS_DIALUP)) 122191783Srmacklem tty.ty_status |= TTY_DIALUP; 123191783Srmacklem else if (scmp(_TTYS_NETWORK)) 124191783Srmacklem tty.ty_status |= TTY_NETWORK; 125191783Srmacklem p = skip(p); 126220530Srmacklem } 127191783Srmacklem } 128192115Srmacklem 129191783Srmacklem for (; *p; p = skip(p)) { 130191783Srmacklem if (scmp(_TTYS_OFF)) 131191783Srmacklem tty.ty_status &= ~TTY_ON; 132191783Srmacklem else if (scmp(_TTYS_ON)) 133191783Srmacklem tty.ty_status |= TTY_ON; 134191783Srmacklem else if (scmp(_TTYS_SECURE)) 135191783Srmacklem tty.ty_status |= TTY_SECURE; 136191783Srmacklem else if (scmp(_TTYS_INSECURE)) 137191783Srmacklem tty.ty_status &= ~TTY_SECURE; 138191783Srmacklem else if (scmp(_TTYS_DIALUP)) 139191783Srmacklem tty.ty_status |= TTY_DIALUP; 140191783Srmacklem else if (scmp(_TTYS_NETWORK)) 141191783Srmacklem tty.ty_status |= TTY_NETWORK; 142191783Srmacklem else if (vcmp(_TTYS_WINDOW)) 143191783Srmacklem tty.ty_window = value(p); 144191783Srmacklem else if (vcmp(_TTYS_GROUP)) 145191783Srmacklem tty.ty_group = value(p); 146191783Srmacklem else 147191783Srmacklem break; 148191783Srmacklem } 149191783Srmacklem 150191783Srmacklem if (zapchar == '#' || *p == '#') 151191783Srmacklem while ((c = *++p) == ' ' || c == '\t') 152191783Srmacklem ; 153191783Srmacklem tty.ty_comment = p; 154191783Srmacklem if (*p == 0) 155191783Srmacklem tty.ty_comment = 0; 156191783Srmacklem if ( (p = index(p, '\n')) ) 157191783Srmacklem *p = '\0'; 158191783Srmacklem return (&tty); 159191783Srmacklem} 160191783Srmacklem 161191783Srmacklem#define QUOTED 1 162191783Srmacklem 163191783Srmacklem/* 164191783Srmacklem * Skip over the current field, removing quotes, and return a pointer to 165191783Srmacklem * the next field. 166191783Srmacklem */ 167191783Srmacklemstatic char * 168191783Srmacklemskip(p) 169191783Srmacklem char *p; 170191783Srmacklem{ 171191783Srmacklem char *t; 172191783Srmacklem int c, q; 173191783Srmacklem 174191783Srmacklem for (q = 0, t = p; (c = *p) != '\0'; p++) { 175191783Srmacklem if (c == '"') { 176191783Srmacklem q ^= QUOTED; /* obscure, but nice */ 177191783Srmacklem continue; 178191783Srmacklem } 179191783Srmacklem if (q == QUOTED && *p == '\\' && *(p+1) == '"') 180191783Srmacklem p++; 181191783Srmacklem *t++ = *p; 182191783Srmacklem if (q == QUOTED) 183191783Srmacklem continue; 184191783Srmacklem if (c == '#') { 185191783Srmacklem zapchar = c; 186191783Srmacklem *p = 0; 187191783Srmacklem break; 188191783Srmacklem } 189191783Srmacklem if (c == '\t' || c == ' ' || c == '\n') { 190191783Srmacklem zapchar = c; 191191783Srmacklem *p++ = 0; 192191783Srmacklem while ((c = *p) == '\t' || c == ' ' || c == '\n') 193191783Srmacklem p++; 194191783Srmacklem break; 195191783Srmacklem } 196191783Srmacklem } 197191783Srmacklem *--t = '\0'; 198191783Srmacklem return (p); 199191783Srmacklem} 200191783Srmacklem 201191783Srmacklemstatic char * 202191783Srmacklemvalue(p) 203191783Srmacklem char *p; 204191783Srmacklem{ 205191783Srmacklem 206191783Srmacklem return ((p = index(p, '=')) ? ++p : NULL); 207191783Srmacklem} 208191783Srmacklem 209191783Srmacklemint 210191783Srmacklemsetttyent() 211191783Srmacklem{ 212192115Srmacklem 213191783Srmacklem if (line == NULL) { 214191783Srmacklem if ((line = malloc(MALLOCCHUNK)) == NULL) 215191783Srmacklem return (0); 216192115Srmacklem lbsize = MALLOCCHUNK; 217191783Srmacklem } 218191783Srmacklem if (tf) { 219191783Srmacklem rewind(tf); 220191783Srmacklem return (1); 221191783Srmacklem } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 222191783Srmacklem return (1); 223191783Srmacklem return (0); 224191783Srmacklem} 225191783Srmacklem 226191783Srmacklemint 227192115Srmacklemendttyent() 228191783Srmacklem{ 229191783Srmacklem int rval; 230191783Srmacklem 231191783Srmacklem /* 232191783Srmacklem * NB: Don't free `line' because getttynam() 233191783Srmacklem * may still be referencing it 234191783Srmacklem */ 235251641Sken if (tf) { 236191783Srmacklem rval = (fclose(tf) != EOF); 237191783Srmacklem tf = NULL; 238191783Srmacklem return (rval); 239191783Srmacklem } 240191783Srmacklem return (1); 241191783Srmacklem} 242191783Srmacklem 243191783Srmacklemstatic int 244191783Srmacklemisttystat(tty, flag) 245191783Srmacklem const char *tty; 246191783Srmacklem int flag; 247191783Srmacklem{ 248191783Srmacklem struct ttyent *t; 249191783Srmacklem 250222389Srmacklem return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 251191783Srmacklem} 252191783Srmacklem 253222389Srmacklem 254211951Srmacklemint 255205941Srmacklemisdialuptty(tty) 256191783Srmacklem const char *tty; 257191783Srmacklem{ 258192115Srmacklem 259192115Srmacklem return isttystat(tty, TTY_DIALUP); 260191783Srmacklem} 261192115Srmacklem 262191783Srmacklemint isnettty(tty) 263191783Srmacklem const char *tty; 264191783Srmacklem{ 265191783Srmacklem 266191783Srmacklem return isttystat(tty, TTY_NETWORK); 267191783Srmacklem} 268191783Srmacklem