confstr.c revision 114256
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) 35static char sccsid[] = "@(#)confstr.c 8.1 (Berkeley) 6/4/93"; 36#endif /* LIBC_SCCS and not lint */ 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: head/lib/libc/gen/confstr.c 114256 2003-04-29 21:13:50Z nectar $"); 39 40#include "namespace.h" 41#include <sys/param.h> 42#include <errno.h> 43#include <limits.h> 44#include <paths.h> 45#include <string.h> 46#include <unistd.h> 47#include "un-namespace.h" 48 49 50size_t 51confstr(int name, char *buf, size_t len) 52{ 53 const char *p; 54 const char UPE[] = "unsupported programming environment"; 55 56 switch (name) { 57 case _CS_PATH: 58 p = _PATH_STDPATH; 59 goto docopy; 60 61 /* 62 * POSIX/SUS ``Programming Environments'' stuff 63 * 64 * We don't support more than one programming environment 65 * on any platform (yet), so we just return the empty 66 * string for the environment we are compiled for, 67 * and the string "unsupported programming environment" 68 * for anything else. (The Standard says that if these 69 * values are used on a system which does not support 70 * this environment -- determined via sysconf() -- then 71 * the value we return is unspecified. So, we return 72 * something which will cause obvious breakage.) 73 */ 74 case _CS_POSIX_V6_ILP32_OFF32_CFLAGS: 75 case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS: 76 case _CS_POSIX_V6_ILP32_OFF32_LIBS: 77 case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS: 78 case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS: 79 case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS: 80 /* 81 * These two environments are never supported. 82 */ 83 p = UPE; 84 goto docopy; 85 86 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS: 87 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS: 88 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS: 89 if (sizeof(long) * CHAR_BIT == 32 && 90 sizeof(off_t) > sizeof(long)) 91 p = ""; 92 else 93 p = UPE; 94 goto docopy; 95 96 case _CS_POSIX_V6_LP64_OFF64_CFLAGS: 97 case _CS_POSIX_V6_LP64_OFF64_LDFLAGS: 98 case _CS_POSIX_V6_LP64_OFF64_LIBS: 99 if (sizeof(long) * CHAR_BIT >= 64 && 100 sizeof(void *) * CHAR_BIT >= 64 && 101 sizeof(int) * CHAR_BIT >= 32 && 102 sizeof(off_t) >= sizeof(long)) 103 p = ""; 104 else 105 p = UPE; 106 goto docopy; 107 108 case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS: 109 /* XXX - should have more complete coverage */ 110 if (sizeof(long) * CHAR_BIT >= 64) 111 p = "_POSIX_V6_LP64_OFF64"; 112 else 113 p = "_POSIX_V6_ILP32_OFFBIG"; 114 goto docopy; 115 116docopy: 117 if (len != 0 && buf != NULL) 118 _strlcpy(buf, p, len); 119 return (strlen(p) + 1); 120 121 default: 122 errno = EINVAL; 123 return (0); 124 } 125 /* NOTREACHED */ 126} 127