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OpenSolaris 2009.06 - man page for double_to_decimal (opensolaris section 3c)

floating_to_decimal(3C) 				   Standard C Library Functions 				   floating_to_decimal(3C)

floating_to_decimal, single_to_decimal, double_to_decimal, extended_to_decimal, quadruple_to_decimal - convert floating-point value to dec- imal record
#include <floatingpoint.h> void single_to_decimal(single *px, decimal_mode *pm, decimal_record *pd, fp_exception_field_type *ps); void double_to_decimal(double *px, decimal_mode *pm, decimal_record *pd, fp_exception_field_type *ps); void extended_to_decimal(extended *px, decimal_mode *pm, decimal_record *pd, fp_exception_field_type *ps); void quadruple_to_decimal(quadruple *px, decimal_mode *pm, decimal_record *pd, fp_exception_field_type *ps);
The floating_to_decimal functions convert the floating-point value at *px into a decimal record at *pd, observing the modes specified in *pm and setting exceptions in *ps. If there are no IEEE exceptions, *ps will be zero. If *px is zero, infinity, or NaN, then only pd->sign and pd->fpclass are set. Otherwise pd->exponent and pd->ds are also set so that (sig)*(pd->ds)*10**(pd->exponent) is a correctly rounded approximation to *px, where sig is +1 or -1, depending upon whether pd->sign is 0 or -1. pd->ds has at least one and no more than DECIMAL_STRING_LENGTH-1 significant digits because one character is used to terminate the string with a null. pd->ds is correctly rounded according to the IEEE rounding modes in pm->rd. *ps has fp_inexact set if the result was inexact, and has fp_overflow set if the string result does not fit in pd->ds because of the limitation DECIMAL_STRING_LENGTH. If pm->df == floating_form, then pd->ds always contains pm->ndigits significant digits. Thus if *px == 12.34 and pm->ndigits == 8, then pd->ds will contain 12340000 and pd->exponent will contain -6. If pm->df == fixed_form and pm->ndigits >= 0, then the decimal value is rounded at pm->ndigits digits to the right of the decimal point. For example, if *px == 12.34 and pm->ndigits == 1, then pd->ds will contain 123 and pd->exponent will be set to -1. If pm->df == fixed_form and pm->ndigits< 0, then the decimal value is rounded at -pm->ndigits digits to the left of the decimal point, and pd->ds is padded with trailing zeros up to the decimal point. For example, if *px == 12.34 and pm->n digits == -1, then pd->ds will contain 10 and pd->exponent will be set to 0. When pm->df == fixed_form and the value to be converted is large enough that the resulting string would contain more than DECI- MAL_STRING_LENGTH-1 digits, then the string placed in pd->ds is limited to exactly DECIMAL_STRING_LENGTH-1 digits (by moving the place at which the value is rounded further left if need be), pd->exponent is adjusted accordingly and the overflow flag is set in *ps. pd->more is not used. The econvert(3C), fconvert(3C), gconvert(3C), printf(3C), and sprintf(3C) functions all use double_to_decimal().
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+
econvert(3C), fconvert(3C), gconvert(3C), printf(3C), sprintf(3C), attributes(5) SunOS 5.11 7 Jun 2005 floating_to_decimal(3C)