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getttyent.c revision 1.8
      1 /*	$NetBSD: getttyent.c,v 1.8 1995/02/27 04:13:20 cgd 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 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)getttyent.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: getttyent.c,v 1.8 1995/02/27 04:13:20 cgd Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include <ttyent.h>
     45 #include <stdio.h>
     46 #include <ctype.h>
     47 #include <string.h>
     48 
     49 static char zapchar;
     50 static FILE *tf;
     51 
     52 struct ttyent *
     53 getttynam(tty)
     54 	const char *tty;
     55 {
     56 	register struct ttyent *t;
     57 
     58 	setttyent();
     59 	while (t = getttyent())
     60 		if (!strcmp(tty, t->ty_name))
     61 			break;
     62 	endttyent();
     63 	return (t);
     64 }
     65 
     66 struct ttyent *
     67 getttyent()
     68 {
     69 	static struct ttyent tty;
     70 	register int c;
     71 	register char *p;
     72 #define	MAXLINELENGTH	200
     73 	static char line[MAXLINELENGTH];
     74 	static char *skip(), *value();
     75 
     76 	if (!tf && !setttyent())
     77 		return (NULL);
     78 	for (;;) {
     79 		if (!fgets(p = line, sizeof(line), tf))
     80 			return (NULL);
     81 		/* skip lines that are too big */
     82 		if (!strchr(p, '\n')) {
     83 			while ((c = getc(tf)) != '\n' && c != EOF)
     84 				;
     85 			continue;
     86 		}
     87 		while (isspace(*p))
     88 			++p;
     89 		if (*p && *p != '#')
     90 			break;
     91 	}
     92 
     93 	zapchar = 0;
     94 	tty.ty_name = p;
     95 	p = skip(p);
     96 	if (!*(tty.ty_getty = p))
     97 		tty.ty_getty = tty.ty_type = NULL;
     98 	else {
     99 		p = skip(p);
    100 		if (!*(tty.ty_type = p))
    101 			tty.ty_type = NULL;
    102 		else
    103 			p = skip(p);
    104 	}
    105 	tty.ty_status = 0;
    106 	tty.ty_window = NULL;
    107 
    108 #define	scmp(e)	!strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
    109 #define	vcmp(e)	!strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
    110 	for (; *p; p = skip(p)) {
    111 		if (scmp(_TTYS_OFF))
    112 			tty.ty_status &= ~TTY_ON;
    113 		else if (scmp(_TTYS_ON))
    114 			tty.ty_status |= TTY_ON;
    115 		else if (scmp(_TTYS_SECURE))
    116 			tty.ty_status |= TTY_SECURE;
    117 		else if (scmp(_TTYS_LOCAL))
    118 			tty.ty_status |= TTY_LOCAL;
    119 		else if (scmp(_TTYS_RTSCTS))
    120 			tty.ty_status |= TTY_RTSCTS;
    121 		else if (scmp(_TTYS_SOFTCAR))
    122 			tty.ty_status |= TTY_SOFTCAR;
    123 		else if (scmp(_TTYS_MDMBUF))
    124 			tty.ty_status |= TTY_MDMBUF;
    125 		else if (vcmp(_TTYS_WINDOW))
    126 			tty.ty_window = value(p);
    127 		else
    128 			break;
    129 	}
    130 
    131 	if (zapchar == '#' || *p == '#')
    132 		while ((c = *++p) == ' ' || c == '\t')
    133 			;
    134 	tty.ty_comment = p;
    135 	if (*p == 0)
    136 		tty.ty_comment = 0;
    137 	if (p = strchr(p, '\n'))
    138 		*p = '\0';
    139 	return (&tty);
    140 }
    141 
    142 #define	QUOTED	1
    143 
    144 /*
    145  * Skip over the current field, removing quotes, and return a pointer to
    146  * the next field.
    147  */
    148 static char *
    149 skip(p)
    150 	register char *p;
    151 {
    152 	register char *t;
    153 	register int c, q;
    154 
    155 	for (q = 0, t = p; (c = *p) != '\0'; p++) {
    156 		if (c == '"') {
    157 			q ^= QUOTED;	/* obscure, but nice */
    158 			continue;
    159 		}
    160 		if (q == QUOTED && *p == '\\' && *(p+1) == '"')
    161 			p++;
    162 		*t++ = *p;
    163 		if (q == QUOTED)
    164 			continue;
    165 		if (c == '#') {
    166 			zapchar = c;
    167 			*p = 0;
    168 			break;
    169 		}
    170 		if (c == '\t' || c == ' ' || c == '\n') {
    171 			zapchar = c;
    172 			*p++ = 0;
    173 			while ((c = *p) == '\t' || c == ' ' || c == '\n')
    174 				p++;
    175 			break;
    176 		}
    177 	}
    178 	*--t = '\0';
    179 	return (p);
    180 }
    181 
    182 static char *
    183 value(p)
    184 	register char *p;
    185 {
    186 
    187 	return ((p = strchr(p, '=')) ? ++p : NULL);
    188 }
    189 
    190 int
    191 setttyent()
    192 {
    193 
    194 	if (tf) {
    195 		(void)rewind(tf);
    196 		return (1);
    197 	} else if (tf = fopen(_PATH_TTYS, "r"))
    198 		return (1);
    199 	return (0);
    200 }
    201 
    202 int
    203 endttyent()
    204 {
    205 	int rval;
    206 
    207 	if (tf) {
    208 		rval = !(fclose(tf) == EOF);
    209 		tf = NULL;
    210 		return (rval);
    211 	}
    212 	return (1);
    213 }
    214