1 /* $NetBSD: confstr.c,v 1.6 1995/05/13 06:58:18 jtc 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 1.6 1995/05/13 06:58:18 jtc 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 <string.h> 51 #include <unistd.h> 52 53 size_t 54 confstr(name, buf, len) 55 int name; 56 char *buf; 57 size_t len; 58 { 59 size_t tlen; 60 int mib[2], sverrno; 61 char *p; 62 63 switch (name) { 64 case _CS_PATH: 65 mib[0] = CTL_USER; 66 mib[1] = USER_CS_PATH; 67 if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1) 68 return (-1); 69 if (len != 0 && buf != NULL) { 70 if ((p = malloc(tlen)) == NULL) 71 return (-1); 72 if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) { 73 sverrno = errno; 74 free(p); 75 errno = sverrno; 76 return (-1); 77 } 78 /* 79 * POSIX 1003.2 requires partial return of 80 * the string -- that should be *real* useful. 81 */ 82 (void)strncpy(buf, p, len - 1); 83 buf[len - 1] = '\0'; 84 free(p); 85 } 86 return (tlen + 1); 87 default: 88 errno = EINVAL; 89 return (0); 90 } 91 /* NOTREACHED */ 92 } 93