diff options
Diffstat (limited to 'newlib/libm/math/wf_log10.c')
| -rw-r--r-- | newlib/libm/math/wf_log10.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/newlib/libm/math/wf_log10.c b/newlib/libm/math/wf_log10.c new file mode 100644 index 00000000000..15fa5d939b5 --- /dev/null +++ b/newlib/libm/math/wf_log10.c @@ -0,0 +1,88 @@ +/* wf_log10.c -- float version of w_log10.c. + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + */ + +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +/* + * wrapper log10f(X) + */ + +#include "fdlibm.h" +#include <errno.h> + +#ifdef __STDC__ + float log10f(float x) /* wrapper log10f */ +#else + float log10f(x) /* wrapper log10f */ + float x; +#endif +{ +#ifdef _IEEE_LIBM + return __ieee754_log10f(x); +#else + float z; + struct exception exc; + z = __ieee754_log10f(x); + if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z; + if(x<=(float)0.0) { +#ifndef HUGE_VAL +#define HUGE_VAL inf + double inf = 0.0; + + SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ +#endif + exc.name = "log10f"; + exc.err = 0; + exc.arg1 = exc.arg2 = (double)x; + if (_LIB_VERSION == _SVID_) + exc.retval = -HUGE; + else + exc.retval = -HUGE_VAL; + if(x==(float)0.0) { + /* log10f(0) */ + exc.type = SING; + if (_LIB_VERSION == _POSIX_) + errno = ERANGE; + else if (!matherr(&exc)) { + errno = EDOM; + } + } else { + /* log10f(x<0) */ + exc.type = DOMAIN; + if (_LIB_VERSION == _POSIX_) + errno = EDOM; + else if (!matherr(&exc)) { + errno = EDOM; + } + } + if (exc.err != 0) + errno = exc.err; + return (float)exc.retval; + } else + return z; +#endif +} + +#ifdef _DOUBLE_IS_32BITS + +#ifdef __STDC__ + double log10(double x) +#else + double log10(x) + double x; +#endif +{ + return (double) log10f((float) x); +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ |