1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 34 #include <errno.h> 35 #include <limits.h> 36 #include <paths.h> 37 #include <string.h> 38 #include <unistd.h> 39 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 /* 72 * These two environments are never supported. 73 */ 74 p = UPE; 75 goto docopy; 76 77 case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS: 78 case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS: 79 case _CS_POSIX_V6_ILP32_OFFBIG_LIBS: 80 if (sizeof(long) * CHAR_BIT == 32 && 81 sizeof(off_t) > sizeof(long)) 82 p = ""; 83 else 84 p = UPE; 85 goto docopy; 86 87 case _CS_POSIX_V6_LP64_OFF64_CFLAGS: 88 case _CS_POSIX_V6_LP64_OFF64_LDFLAGS: 89 case _CS_POSIX_V6_LP64_OFF64_LIBS: 90 if (sizeof(long) * CHAR_BIT >= 64 && 91 sizeof(void *) * CHAR_BIT >= 64 && 92 sizeof(int) * CHAR_BIT >= 32 && 93 sizeof(off_t) >= sizeof(long)) 94 p = ""; 95 else 96 p = UPE; 97 goto docopy; 98 99 case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS: 100 /* XXX - should have more complete coverage */ 101 if (sizeof(long) * CHAR_BIT >= 64) 102 p = "_POSIX_V6_LP64_OFF64"; 103 else 104 p = "_POSIX_V6_ILP32_OFFBIG"; 105 goto docopy; 106 107 docopy: 108 if (len != 0 && buf != NULL) 109 strlcpy(buf, p, len); 110 return (strlen(p) + 1); 111 112 default: 113 errno = EINVAL; 114 return (0); 115 } 116 /* NOTREACHED */ 117 } 118