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 size_t 42 confstr(int name, char *buf, size_t len) 43 { 44 const char *p; 45 const char UPE[] = "unsupported programming environment"; 46 47 switch (name) { 48 case _CS_PATH: 49 p = _PATH_STDPATH; 50 goto docopy; 51 52 /* 53 * POSIX/SUS ``Programming Environments'' stuff 54 * 55 * We don't support more than one programming environment 56 * on any platform (yet), so we just return the empty 57 * string for the environment we are compiled for, 58 * and the string "unsupported programming environment" 59 * for anything else. (The Standard says that if these 60 * values are used on a system which does not support 61 * this environment -- determined via sysconf() -- then 62 * the value we return is unspecified. So, we return 63 * something which will cause obvious breakage.) 64 */ 65 case _CS_POSIX_V6_ILP32_OFF32_CFLAGS: 66 case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS: 67 case _CS_POSIX_V6_ILP32_OFF32_LIBS: 68 case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS: 69 case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS: 70 case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS: 71 case _CS_POSIX_V7_ILP32_OFF32_CFLAGS: 72 case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS: 73 case _CS_POSIX_V7_ILP32_OFF32_LIBS: 74 case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS: 75 case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS: 76 case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS: 77 /* 78 * These two environments are never supported. 79 */ 80 p = UPE; 81 goto docopy; 82 83 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS: 84 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS: 85 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS: 86 case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS: 87 case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS: 88 case _CS_POSIX_V7_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 case _CS_POSIX_V7_LP64_OFF64_CFLAGS: 100 case _CS_POSIX_V7_LP64_OFF64_LDFLAGS: 101 case _CS_POSIX_V7_LP64_OFF64_LIBS: 102 if (sizeof(long) * CHAR_BIT >= 64 && 103 sizeof(void *) * CHAR_BIT >= 64 && 104 sizeof(int) * CHAR_BIT >= 32 && 105 sizeof(off_t) >= sizeof(long)) 106 p = ""; 107 else 108 p = UPE; 109 goto docopy; 110 111 case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS: 112 /* XXX - should have more complete coverage */ 113 if (sizeof(long) * CHAR_BIT >= 64) 114 p = "_POSIX_V6_LP64_OFF64"; 115 else 116 p = "_POSIX_V6_ILP32_OFFBIG"; 117 goto docopy; 118 119 case _CS_POSIX_V7_WIDTH_RESTRICTED_ENVS: 120 /* XXX - should have more complete coverage */ 121 if (sizeof(long) * CHAR_BIT >= 64) 122 p = "_POSIX_V7_LP64_OFF64"; 123 else 124 p = "_POSIX_V7_ILP32_OFFBIG"; 125 goto docopy; 126 127 case _CS_V6_ENV: 128 case _CS_V7_ENV: 129 p = ""; 130 goto docopy; 131 132 docopy: 133 if (len != 0 && buf != NULL) 134 strlcpy(buf, p, len); 135 return (strlen(p) + 1); 136 137 default: 138 errno = EINVAL; 139 return (0); 140 } 141 /* NOTREACHED */ 142 } 143