a C standard library for fx Casio calculators
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#include <fxlibc/printf.h>
void __printf_compute_geometry(
struct __printf_format *opt,
struct __printf_geometry *g)
{
int integral = (g->style == _PRINTF_INTEGER);
int numerical = (g->style == _PRINTF_NUMERIC) || integral;
int padding;
/* Sign character (no discussion required for negative values) */
if(numerical && g->sign == '+')
{
g->sign = 0;
if(opt->blank_sign) g->sign = ' ';
if(opt->force_sign) g->sign = '+';
}
g->zeros = 0;
padding = opt->length - (g->sign != 0) - g->prefix
- (g->content > opt->precision ? g->content : opt->precision);
if(padding < 0) padding = 0;
/* In integral modes, precision forces zeros */
if(integral && opt->precision >= 0)
{
if(opt->alignment == '0') opt->alignment = 0;
int zeros = opt->precision - g->content;
if(zeros > 0) g->zeros = zeros;
}
if(opt->alignment == '0')
{
/* Zeros are only allowed in numerical modes */
if(numerical) g->zeros = padding;
else g->left_spaces = padding;
}
else if(opt->alignment == '-')
{
g->right_spaces = padding;
}
else
{
g->left_spaces = padding;
}
}
int64_t __printf_load_i(int size, va_list *args)
{
if(size == 1)
return (int8_t)va_arg(*args, int);
if(size == 2)
return (int16_t)va_arg(*args, int);
if(size == 8)
return va_arg(*args, long long);
return va_arg(*args, int);
}
uint64_t __printf_load_u(int size, va_list *args)
{
if(size == 1)
return (uint8_t)va_arg(*args, unsigned int);
if(size == 2)
return (uint16_t)va_arg(*args, unsigned int);
if(size == 8)
return va_arg(*args, unsigned long long);
return va_arg(*args, unsigned int);
}
int __printf_digits10(char *str, uint64_t n)
{
int digits = 0;
while(n || !digits)
{
/* TODO: Use fast division in __printf_digits10() */
str[digits++] = (n % 10) + '0';
n /= 10;
}
return digits;
}
int __printf_digits16(char *str, int uppercase, uint64_t n)
{
char *hex = uppercase ? "0123456789ABCDEF" : "0123456789abcdef";
int digits = 0;
while(n || !digits)
{
str[digits++] = hex[n & 0xf];
n >>= 4;
}
return digits;
}
int __printf_digits8(char *str, uint64_t n)
{
int digits = 0;
while(n || !digits)
{
str[digits++] = (n & 0x7) + '0';
n >>= 3;
}
return digits;
}