getttyent.c revision 203068
11573Srgrimes/* 21573Srgrimes * Copyright (c) 1989, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 4. Neither the name of the University nor the names of its contributors 141573Srgrimes * may be used to endorse or promote products derived from this software 151573Srgrimes * without specific prior written permission. 161573Srgrimes * 171573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271573Srgrimes * SUCH DAMAGE. 281573Srgrimes */ 291573Srgrimes 301573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 311573Srgrimesstatic char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 321573Srgrimes#endif /* LIBC_SCCS and not lint */ 3390045Sobrien#include <sys/cdefs.h> 3490045Sobrien__FBSDID("$FreeBSD: head/lib/libc/gen/getttyent.c 203068 2010-01-27 11:54:42Z ed $"); 351573Srgrimes 361573Srgrimes#include <ttyent.h> 371573Srgrimes#include <stdio.h> 3819031Sjoerg#include <stdlib.h> 391573Srgrimes#include <ctype.h> 401573Srgrimes#include <string.h> 411573Srgrimes 421573Srgrimesstatic char zapchar; 431573Srgrimesstatic FILE *tf; 4419031Sjoergstatic size_t lbsize; 4519031Sjoergstatic char *line; 461573Srgrimes 4719031Sjoerg#define MALLOCCHUNK 100 4819031Sjoerg 4990045Sobrienstatic char *skip(char *); 5090045Sobrienstatic char *value(char *); 5119031Sjoerg 521573Srgrimesstruct ttyent * 53200150Sedgetttynam(const char *tty) 541573Srgrimes{ 5590045Sobrien struct ttyent *t; 561573Srgrimes 5724899Sdavidn if (strncmp(tty, "/dev/", 5) == 0) 5824893Sdavidn tty += 5; 591573Srgrimes setttyent(); 6017141Sjkh while ( (t = getttyent()) ) 611573Srgrimes if (!strcmp(tty, t->ty_name)) 621573Srgrimes break; 631573Srgrimes endttyent(); 641573Srgrimes return (t); 651573Srgrimes} 661573Srgrimes 671573Srgrimesstruct ttyent * 68200150Sedgetttyent(void) 691573Srgrimes{ 701573Srgrimes static struct ttyent tty; 7190045Sobrien char *p; 7290045Sobrien int c; 7319031Sjoerg size_t i; 741573Srgrimes 751573Srgrimes if (!tf && !setttyent()) 761573Srgrimes return (NULL); 771573Srgrimes for (;;) { 78203068Sed if (!fgets(p = line, lbsize, tf)) 791573Srgrimes return (NULL); 8019031Sjoerg /* extend buffer if line was too big, and retry */ 81175345Sdas while (!index(p, '\n') && !feof(tf)) { 8219031Sjoerg i = strlen(p); 8319031Sjoerg lbsize += MALLOCCHUNK; 8419082Sjoerg if ((p = realloc(line, lbsize)) == NULL) { 8519031Sjoerg (void)endttyent(); 8619031Sjoerg return (NULL); 8719031Sjoerg } 8819082Sjoerg line = p; 8919031Sjoerg if (!fgets(&line[i], lbsize - i, tf)) 9019031Sjoerg return (NULL); 911573Srgrimes } 9252856Sache while (isspace((unsigned char)*p)) 931573Srgrimes ++p; 941573Srgrimes if (*p && *p != '#') 951573Srgrimes break; 961573Srgrimes } 971573Srgrimes 9852856Sache#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 9924893Sdavidn#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 10024893Sdavidn 1011573Srgrimes zapchar = 0; 1021573Srgrimes tty.ty_name = p; 103148401Smdodd tty.ty_status = 0; 104148401Smdodd tty.ty_window = NULL; 105148401Smdodd tty.ty_group = _TTYS_NOGROUP; 106148401Smdodd 1071573Srgrimes p = skip(p); 1081573Srgrimes if (!*(tty.ty_getty = p)) 1091573Srgrimes tty.ty_getty = tty.ty_type = NULL; 1101573Srgrimes else { 1111573Srgrimes p = skip(p); 1121573Srgrimes if (!*(tty.ty_type = p)) 1131573Srgrimes tty.ty_type = NULL; 11424893Sdavidn else { 11524893Sdavidn /* compatibility kludge: handle network/dialup specially */ 11624893Sdavidn if (scmp(_TTYS_DIALUP)) 11724893Sdavidn tty.ty_status |= TTY_DIALUP; 11824893Sdavidn else if (scmp(_TTYS_NETWORK)) 11924893Sdavidn tty.ty_status |= TTY_NETWORK; 1201573Srgrimes p = skip(p); 12124893Sdavidn } 1221573Srgrimes } 1231573Srgrimes 1241573Srgrimes for (; *p; p = skip(p)) { 1251573Srgrimes if (scmp(_TTYS_OFF)) 1261573Srgrimes tty.ty_status &= ~TTY_ON; 1271573Srgrimes else if (scmp(_TTYS_ON)) 1281573Srgrimes tty.ty_status |= TTY_ON; 1291573Srgrimes else if (scmp(_TTYS_SECURE)) 1301573Srgrimes tty.ty_status |= TTY_SECURE; 13122734Sdavidn else if (scmp(_TTYS_INSECURE)) 13222734Sdavidn tty.ty_status &= ~TTY_SECURE; 13324893Sdavidn else if (scmp(_TTYS_DIALUP)) 13424893Sdavidn tty.ty_status |= TTY_DIALUP; 13524893Sdavidn else if (scmp(_TTYS_NETWORK)) 13624893Sdavidn tty.ty_status |= TTY_NETWORK; 1371573Srgrimes else if (vcmp(_TTYS_WINDOW)) 1381573Srgrimes tty.ty_window = value(p); 13921189Sdavidn else if (vcmp(_TTYS_GROUP)) 14021189Sdavidn tty.ty_group = value(p); 1411573Srgrimes else 1421573Srgrimes break; 1431573Srgrimes } 1441573Srgrimes 1451573Srgrimes if (zapchar == '#' || *p == '#') 1461573Srgrimes while ((c = *++p) == ' ' || c == '\t') 1471573Srgrimes ; 1481573Srgrimes tty.ty_comment = p; 1491573Srgrimes if (*p == 0) 1501573Srgrimes tty.ty_comment = 0; 15117141Sjkh if ( (p = index(p, '\n')) ) 1521573Srgrimes *p = '\0'; 1531573Srgrimes return (&tty); 1541573Srgrimes} 1551573Srgrimes 1561573Srgrimes#define QUOTED 1 1571573Srgrimes 1581573Srgrimes/* 1591573Srgrimes * Skip over the current field, removing quotes, and return a pointer to 1601573Srgrimes * the next field. 1611573Srgrimes */ 1621573Srgrimesstatic char * 163200150Sedskip(char *p) 1641573Srgrimes{ 16590045Sobrien char *t; 16690045Sobrien int c, q; 1671573Srgrimes 1681573Srgrimes for (q = 0, t = p; (c = *p) != '\0'; p++) { 1691573Srgrimes if (c == '"') { 1701573Srgrimes q ^= QUOTED; /* obscure, but nice */ 1711573Srgrimes continue; 1721573Srgrimes } 1731573Srgrimes if (q == QUOTED && *p == '\\' && *(p+1) == '"') 1741573Srgrimes p++; 1751573Srgrimes *t++ = *p; 1761573Srgrimes if (q == QUOTED) 1771573Srgrimes continue; 1781573Srgrimes if (c == '#') { 1791573Srgrimes zapchar = c; 1801573Srgrimes *p = 0; 1811573Srgrimes break; 1821573Srgrimes } 1831573Srgrimes if (c == '\t' || c == ' ' || c == '\n') { 1841573Srgrimes zapchar = c; 1851573Srgrimes *p++ = 0; 1861573Srgrimes while ((c = *p) == '\t' || c == ' ' || c == '\n') 1871573Srgrimes p++; 1881573Srgrimes break; 1891573Srgrimes } 1901573Srgrimes } 1911573Srgrimes *--t = '\0'; 1921573Srgrimes return (p); 1931573Srgrimes} 1941573Srgrimes 1951573Srgrimesstatic char * 196200150Sedvalue(char *p) 1971573Srgrimes{ 1981573Srgrimes 1991573Srgrimes return ((p = index(p, '=')) ? ++p : NULL); 2001573Srgrimes} 2011573Srgrimes 2021573Srgrimesint 203200150Sedsetttyent(void) 2041573Srgrimes{ 2051573Srgrimes 20619031Sjoerg if (line == NULL) { 20719031Sjoerg if ((line = malloc(MALLOCCHUNK)) == NULL) 20819031Sjoerg return (0); 20919031Sjoerg lbsize = MALLOCCHUNK; 21019031Sjoerg } 2111573Srgrimes if (tf) { 2129272Shsu rewind(tf); 2131573Srgrimes return (1); 21417141Sjkh } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 2151573Srgrimes return (1); 2161573Srgrimes return (0); 2171573Srgrimes} 2181573Srgrimes 2191573Srgrimesint 220200150Sedendttyent(void) 2211573Srgrimes{ 2221573Srgrimes int rval; 2231573Srgrimes 22420383Sjoerg /* 22520383Sjoerg * NB: Don't free `line' because getttynam() 22620383Sjoerg * may still be referencing it 22720383Sjoerg */ 2281573Srgrimes if (tf) { 22919031Sjoerg rval = (fclose(tf) != EOF); 2301573Srgrimes tf = NULL; 2311573Srgrimes return (rval); 2321573Srgrimes } 2331573Srgrimes return (1); 2341573Srgrimes} 23524893Sdavidn 23624893Sdavidnstatic int 237200150Sedisttystat(const char *tty, int flag) 23824893Sdavidn{ 23990045Sobrien struct ttyent *t; 24024893Sdavidn 24124893Sdavidn return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 24224893Sdavidn} 24324893Sdavidn 24424893Sdavidn 24524893Sdavidnint 246200150Sedisdialuptty(const char *tty) 24724893Sdavidn{ 24824893Sdavidn 24924893Sdavidn return isttystat(tty, TTY_DIALUP); 25024893Sdavidn} 25124893Sdavidn 252200150Sedint 253200150Sedisnettty(const char *tty) 25424893Sdavidn{ 25524893Sdavidn 25624893Sdavidn return isttystat(tty, TTY_NETWORK); 25724893Sdavidn} 258