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. 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 */ 32 33 #include <sys/param.h> 34 35 #include <errno.h> 36 #include <limits.h> 37 #include <paths.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 42 size_t 43 confstr(int name, char *buf, size_t len) 44 { 45 const char *p; 46 const char UPE[] = "unsupported programming environment"; 47 48 switch (name) { 49 case _CS_PATH: 50 p = _PATH_STDPATH; 51 goto docopy; 52 53 /* 54 * POSIX/SUS ``Programming Environments'' stuff 55 * 56 * We don't support more than one programming environment 57 * on any platform (yet), so we just return the empty 58 * string for the environment we are compiled for, 59 * and the string "unsupported programming environment" 60 * for anything else. (The Standard says that if these 61 * values are used on a system which does not support 62 * this environment -- determined via sysconf() -- then 63 * the value we return is unspecified. So, we return 64 * something which will cause obvious breakage.) 65 */ 66 case _CS_POSIX_V6_ILP32_OFF32_CFLAGS: 67 case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS: 68 case _CS_POSIX_V6_ILP32_OFF32_LIBS: 69 case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS: 70 case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS: 71 case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS: 72 case _CS_POSIX_V7_ILP32_OFF32_CFLAGS: 73 case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS: 74 case _CS_POSIX_V7_ILP32_OFF32_LIBS: 75 case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS: 76 case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS: 77 case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS: 78 /* 79 * These two environments are never supported. 80 */ 81 p = UPE; 82 goto docopy; 83 84 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS: 85 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS: 86 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS: 87 case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS: 88 case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS: 89 case _CS_POSIX_V7_ILP32_OFFBIG_LIBS: 90 if (sizeof(long) * CHAR_BIT == 32 && 91 sizeof(off_t) > sizeof(long)) 92 p = ""; 93 else 94 p = UPE; 95 goto docopy; 96 97 case _CS_POSIX_V6_LP64_OFF64_CFLAGS: 98 case _CS_POSIX_V6_LP64_OFF64_LDFLAGS: 99 case _CS_POSIX_V6_LP64_OFF64_LIBS: 100 case _CS_POSIX_V7_LP64_OFF64_CFLAGS: 101 case _CS_POSIX_V7_LP64_OFF64_LDFLAGS: 102 case _CS_POSIX_V7_LP64_OFF64_LIBS: 103 if (sizeof(long) * CHAR_BIT >= 64 && 104 sizeof(void *) * CHAR_BIT >= 64 && 105 sizeof(int) * CHAR_BIT >= 32 && 106 sizeof(off_t) >= sizeof(long)) 107 p = ""; 108 else 109 p = UPE; 110 goto docopy; 111 112 case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS: 113 /* XXX - should have more complete coverage */ 114 if (sizeof(long) * CHAR_BIT >= 64) 115 p = "_POSIX_V6_LP64_OFF64"; 116 else 117 p = "_POSIX_V6_ILP32_OFFBIG"; 118 goto docopy; 119 120 case _CS_POSIX_V7_WIDTH_RESTRICTED_ENVS: 121 /* XXX - should have more complete coverage */ 122 if (sizeof(long) * CHAR_BIT >= 64) 123 p = "_POSIX_V7_LP64_OFF64"; 124 else 125 p = "_POSIX_V7_ILP32_OFFBIG"; 126 goto docopy; 127 128 docopy: 129 if (len != 0 && buf != NULL) 130 strlcpy(buf, p, len); 131 return (strlen(p) + 1); 132 133 default: 134 errno = EINVAL; 135 return (0); 136 } 137 /* NOTREACHED */ 138 } 139