/* * ==================================================== * 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. * ==================================================== */ #include "math.h" #include "math_private.h" #include <errno.h> /* TODO: POSIX says: * * "If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, * then errno shall be set to [ERANGE]. If the integer expression * (math_errhandling & MATH_ERREXCEPT) is non-zero, then the underflow * floating-point exception shall be raised." * * *And it says the same about scalbn*! Thus these two functions * are the same and can be just aliased. * * Currently, ldexp tries to be vaguely POSIX compliant while scalbn * does not (it does not set ERRNO). */ double ldexp(double value, int exp) { if (!isfinite(value) || value == 0.0) return value; value = scalbn(value, exp); if (!isfinite(value) || value == 0.0) errno = ERANGE; return value; } libm_hidden_def(ldexp)