diff options
Diffstat (limited to 'lib/libc/gen/confstr.c')
| -rw-r--r-- | lib/libc/gen/confstr.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/lib/libc/gen/confstr.c b/lib/libc/gen/confstr.c new file mode 100644 index 0000000..966c3fe --- /dev/null +++ b/lib/libc/gen/confstr.c @@ -0,0 +1,125 @@ +/*- + * Copyright (c) 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)confstr.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> + +#include <errno.h> +#include <limits.h> +#include <paths.h> +#include <string.h> +#include <unistd.h> + + +size_t +confstr(int name, char *buf, size_t len) +{ + const char *p; + const char UPE[] = "unsupported programming environment"; + + switch (name) { + case _CS_PATH: + p = _PATH_STDPATH; + goto docopy; + + /* + * POSIX/SUS ``Programming Environments'' stuff + * + * We don't support more than one programming environment + * on any platform (yet), so we just return the empty + * string for the environment we are compiled for, + * and the string "unsupported programming environment" + * for anything else. (The Standard says that if these + * values are used on a system which does not support + * this environment -- determined via sysconf() -- then + * the value we return is unspecified. So, we return + * something which will cause obvious breakage.) + */ + case _CS_POSIX_V6_ILP32_OFF32_CFLAGS: + case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS: + case _CS_POSIX_V6_ILP32_OFF32_LIBS: + case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS: + case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS: + case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS: + /* + * These two environments are never supported. + */ + p = UPE; + goto docopy; + + case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS: + case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS: + case _CS_POSIX_V6_ILP32_OFFBIG_LIBS: + if (sizeof(long) * CHAR_BIT == 32 && + sizeof(off_t) > sizeof(long)) + p = ""; + else + p = UPE; + goto docopy; + + case _CS_POSIX_V6_LP64_OFF64_CFLAGS: + case _CS_POSIX_V6_LP64_OFF64_LDFLAGS: + case _CS_POSIX_V6_LP64_OFF64_LIBS: + if (sizeof(long) * CHAR_BIT >= 64 && + sizeof(void *) * CHAR_BIT >= 64 && + sizeof(int) * CHAR_BIT >= 32 && + sizeof(off_t) >= sizeof(long)) + p = ""; + else + p = UPE; + goto docopy; + + case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS: + /* XXX - should have more complete coverage */ + if (sizeof(long) * CHAR_BIT >= 64) + p = "_POSIX_V6_LP64_OFF64"; + else + p = "_POSIX_V6_ILP32_OFFBIG"; + goto docopy; + +docopy: + if (len != 0 && buf != NULL) + strlcpy(buf, p, len); + return (strlen(p) + 1); + + default: + errno = EINVAL; + return (0); + } + /* NOTREACHED */ +} |
