| /* |
| * ==================================================== |
| * 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) |