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#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 DECIMAL_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)