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confstr.c revision 1.5 
      1 /*	$NetBSD: confstr.c,v 1.5 1995/02/25 08:51:06 cgd Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 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[] = "@(#)confstr.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: confstr.c,v 1.5 1995/02/25 08:51:06 cgd Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include <sys/param.h>
     45 #include <sys/sysctl.h>
     46 
     47 #include <errno.h>
     48 #include <paths.h>
     49 #include <stdlib.h>
     50 #include <unistd.h>
     51 
     52 size_t
     53 confstr(name, buf, len)
     54 	int name;
     55 	char *buf;
     56 	size_t len;
     57 {
     58 	size_t tlen;
     59 	int mib[2], sverrno;
     60 	char *p;
     61 
     62 	switch (name) {
     63 	case _CS_PATH:
     64 		mib[0] = CTL_USER;
     65 		mib[1] = USER_CS_PATH;
     66 		if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1)
     67 			return (-1);
     68 		if (len != 0 && buf != NULL) {
     69 			if ((p = malloc(tlen)) == NULL)
     70 				return (-1);
     71 			if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) {
     72 				sverrno = errno;
     73 				free(p);
     74 				errno = sverrno;
     75 				return (-1);
     76 			}
     77 			/*
     78 			 * POSIX 1003.2 requires partial return of
     79 			 * the string -- that should be *real* useful.
     80 			 */
     81 			(void)strncpy(buf, p, len - 1);
     82 			buf[len - 1] = '\0';
     83 			free(p);
     84 		}
     85 		return (tlen + 1);
     86 	default:
     87 		errno = EINVAL;
     88 		return (0);
     89 	}
     90 	/* NOTREACHED */
     91 }
     92