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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)confstr.c 8.1 (Berkeley) 6/4/93 30 * $FreeBSD: src/lib/libc/gen/confstr.c,v 1.10 2007/01/09 00:27:53 imp Exp $ 31 * $DragonFly: src/lib/libc/gen/confstr.c,v 1.5 2006/12/06 16:33:29 tgen Exp $ 32 */ 33 34 #include <sys/param.h> 35 36 #include <errno.h> 37 #include <limits.h> 38 #include <paths.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 43 size_t 44 confstr(int name, char *buf, size_t len) 45 { 46 const char *p; 47 const char UPE[] = "unsupported programming environment"; 48 49 switch (name) { 50 case _CS_PATH: 51 p = _PATH_STDPATH; 52 goto docopy; 53 54 /* 55 * POSIX/SUS ``Programming Environments'' stuff 56 * 57 * We don't support more than one programming environment 58 * on any platform (yet), so we just return the empty 59 * string for the environment we are compiled for, 60 * and the string "unsupported programming environment" 61 * for anything else. (The Standard says that if these 62 * values are used on a system which does not support 63 * this environment -- determined via sysconf() -- then 64 * the value we return is unspecified. So, we return 65 * something which will cause obvious breakage.) 66 */ 67 case _CS_POSIX_V6_ILP32_OFF32_CFLAGS: 68 case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS: 69 case _CS_POSIX_V6_ILP32_OFF32_LIBS: 70 case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS: 71 case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS: 72 case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS: 73 /* 74 * These two environments are never supported. 75 */ 76 p = UPE; 77 goto docopy; 78 79 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS: 80 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS: 81 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS: 82 if (sizeof(long) * CHAR_BIT == 32 && 83 sizeof(off_t) > sizeof(long)) 84 p = ""; 85 else 86 p = UPE; 87 goto docopy; 88 89 case _CS_POSIX_V6_LP64_OFF64_CFLAGS: 90 case _CS_POSIX_V6_LP64_OFF64_LDFLAGS: 91 case _CS_POSIX_V6_LP64_OFF64_LIBS: 92 if (sizeof(long) * CHAR_BIT >= 64 && 93 sizeof(void *) * CHAR_BIT >= 64 && 94 sizeof(int) * CHAR_BIT >= 32 && 95 sizeof(off_t) >= sizeof(long)) 96 p = ""; 97 else 98 p = UPE; 99 goto docopy; 100 101 case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS: 102 /* XXX - should have more complete coverage */ 103 if (sizeof(long) * CHAR_BIT >= 64) 104 p = "_POSIX_V6_LP64_OFF64"; 105 else 106 p = "_POSIX_V6_ILP32_OFFBIG"; 107 goto docopy; 108 109 docopy: 110 if (len != 0 && buf != NULL) 111 strlcpy(buf, p, len); 112 return (strlen(p) + 1); 113 114 default: 115 errno = EINVAL; 116 return (0); 117 } 118 /* NOTREACHED */ 119 } 120