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confstr.c revision 1.4 
      1 /*-
      2  * Copyright (c) 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 
     34 #if defined(LIBC_SCCS) && !defined(lint)
     35 /*static char sccsid[] = "from: @(#)confstr.c	8.1 (Berkeley) 6/4/93";*/
     36 static char *rcsid = "$Id: confstr.c,v 1.4 1994/06/11 16:40:50 jtc Exp $";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include <sys/param.h>
     40 #include <sys/sysctl.h>
     41 
     42 #include <errno.h>
     43 #include <paths.h>
     44 #include <stdlib.h>
     45 #include <unistd.h>
     46 
     47 size_t
     48 confstr(name, buf, len)
     49 	int name;
     50 	char *buf;
     51 	size_t len;
     52 {
     53 	size_t tlen;
     54 	int mib[2], sverrno;
     55 	char *p;
     56 
     57 	switch (name) {
     58 	case _CS_PATH:
     59 		mib[0] = CTL_USER;
     60 		mib[1] = USER_CS_PATH;
     61 		if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1)
     62 			return (-1);
     63 		if (len != 0 && buf != NULL) {
     64 			if ((p = malloc(tlen)) == NULL)
     65 				return (-1);
     66 			if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) {
     67 				sverrno = errno;
     68 				free(p);
     69 				errno = sverrno;
     70 				return (-1);
     71 			}
     72 			/*
     73 			 * POSIX 1003.2 requires partial return of
     74 			 * the string -- that should be *real* useful.
     75 			 */
     76 			(void)strncpy(buf, p, len - 1);
     77 			buf[len - 1] = '\0';
     78 			free(p);
     79 		}
     80 		return (tlen + 1);
     81 	default:
     82 		errno = EINVAL;
     83 		return (0);
     84 	}
     85 	/* NOTREACHED */
     86 }
     87