a C standard library for fx Casio calculators
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#include <fxlibc/printf.h>
/* Fixed-point decimal formatter (extension: %D)
(0) Pad with zeros, rather than spaces, on the left
(-) Move spaces to the right (overrides '0')
( ) Force a blank sign before nonnegative numbers
(+) Force a sign before every number (overrides ' ')
{len} Minimal number of characters to print
{pre} Number of digits after the decimal dot */
void __printf_format_D(
struct __printf_output * restrict out,
struct __printf_format * restrict opt,
va_list * restrict args)
{
int64_t n = __printf_load_i(opt->size, args);
/* Compute the sign and the absolute value */
struct __printf_geometry g = {
.sign = (n < 0) ? '-' : '+',
.prefix = 0,
.style = _PRINTF_NUMERIC,
};
if(n < 0) n = -n;
/* Get the digit string */
char digits[32];
g.content = __printf_digits10(digits, n) + 1;
__printf_compute_geometry(opt, &g);
/* Print the result */
__printf_outn(out, ' ', g.left_spaces);
if(g.sign) __printf_out(out, g.sign);
__printf_outn(out, '0', g.zeros);
for(int i = g.content - 2; i >= 0; i--)
{
if(i == opt->precision - 1) __printf_out(out, '.');
__printf_out(out, digits[i]);
}
__printf_outn(out, ' ', g.right_spaces);
}
void __printf_enable_fixed(void)
{
__printf_register('D', __printf_format_D);
}