confstr.c revision 103593
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 103593 2002-09-19 03:47:36Z wollman $"); 39 40#include <sys/param.h> 41 42#include <errno.h> 43#include <limits.h> 44#include <paths.h> 45#include <string.h> 46#include <unistd.h> 47 48 49size_t 50confstr(int name, char *buf, size_t len) 51{ 52 const char *p; 53 const char UPE[] = "unsupported programming environment"; 54 55 switch (name) { 56 case _CS_PATH: 57 p = _PATH_STDPATH; 58 goto docopy; 59 60 /* 61 * POSIX/SUS ``Programming Environments'' stuff 62 * 63 * We don't support more than one programming environment 64 * on any platform (yet), so we just return the empty 65 * string for the environment we are compiled for, 66 * and the string "unsupported programming environment" 67 * for anything else. (The Standard says that if these 68 * values are used on a system which does not support 69 * this environment -- determined via sysconf() -- then 70 * the value we return is unspecified. So, we return 71 * something which will cause obvious breakage.) 72 */ 73 case _CS_POSIX_V6_ILP32_OFF32_CFLAGS: 74 case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS: 75 case _CS_POSIX_V6_ILP32_OFF32_LIBS: 76 case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS: 77 case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS: 78 case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS: 79 /* 80 * These two environments are never supported. 81 */ 82 p = UPE; 83 goto docopy; 84 85 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS: 86 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS: 87 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS: 88 if (sizeof(long) * CHAR_BIT == 32 && 89 sizeof(off_t) > sizeof(long)) 90 p = ""; 91 else 92 p = UPE; 93 goto docopy; 94 95 case _CS_POSIX_V6_LP64_OFF64_CFLAGS: 96 case _CS_POSIX_V6_LP64_OFF64_LDFLAGS: 97 case _CS_POSIX_V6_LP64_OFF64_LIBS: 98 if (sizeof(long) * CHAR_BIT >= 64 && 99 sizeof(void *) * CHAR_BIT >= 64 && 100 sizeof(int) * CHAR_BIT >= 32 && 101 sizeof(off_t) >= sizeof(long)) 102 p = ""; 103 else 104 p = UPE; 105 goto docopy; 106 107 case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS: 108 /* XXX - should have more complete coverage */ 109 if (sizeof(long) * CHAR_BIT >= 64) 110 p = "_POSIX_V6_LP64_OFF64"; 111 else 112 p = "_POSIX_V6_ILP32_OFFBIG"; 113 goto docopy; 114 115docopy: 116 if (len != 0 && buf != NULL) 117 strlcpy(buf, p, len); 118 return (strlen(p) + 1); 119 120 default: 121 errno = EINVAL; 122 return (0); 123 } 124 /* NOTREACHED */ 125} 126