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Diffstat (limited to 'lib/libc/i386/gen/isinf.c')
| -rw-r--r-- | lib/libc/i386/gen/isinf.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/lib/libc/i386/gen/isinf.c b/lib/libc/i386/gen/isinf.c new file mode 100644 index 0000000..bcbeded --- /dev/null +++ b/lib/libc/i386/gen/isinf.c @@ -0,0 +1,64 @@ +/*- + * Copyright (c) 1991, 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[] = "@(#)isinf.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> + +isnan(d) + double d; +{ + register struct IEEEdp { + u_int manl : 32; + u_int manh : 20; + u_int exp : 11; + u_int sign : 1; + } *p = (struct IEEEdp *)&d; + + return(p->exp == 2047 && (p->manh || p->manl)); +} + +isinf(d) + double d; +{ + register struct IEEEdp { + u_int manl : 32; + u_int manh : 20; + u_int exp : 11; + u_int sign : 1; + } *p = (struct IEEEdp *)&d; + + return(p->exp == 2047 && !p->manh && !p->manl); +} |
