a C standard library for fx Casio calculators
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fxlibc/src/libc/stdio/internal/printf_options.c

127 lines
2.4 KiB

#include <stdio.h>
// internal depency
#include "printf.h"
static int get_flags(struct printf_opt *opt, const char *restrict format)
{
int i;
i = -1;
opt->flags.diez = 0;
opt->flags.zero = 0;
opt->flags.minus = 0;
opt->flags.space = 0;
opt->flags.plus = 0;
while (format[++i] != '\0') {
switch (format[i]) {
case '#':
opt->flags.diez = 1;
break;
case '0':
opt->flags.zero = 1;
break;
case '-':
opt->flags.minus = 1;
break;
case ' ':
opt->flags.space = 1;
break;
case '+':
opt->flags.plus = 1;
break;
default:
return (i);
}
}
return (i);
}
static int get_width(struct printf_opt *opt, const char *restrict format)
{
// Check dynamic width
if (format[0] == '*') {
opt->width = va_arg(opt->ap, int);
return (1);
}
// Check error
int i = -1;
opt->width = 0;
if (format[0] == '0')
return (0);
// Get static width
while (format[++i] >= '0' && format[i] <= '9')
opt->width = (opt->width * 10) + (format[i] - '0');
return (i);
}
static int get_precision(struct printf_opt *opt, const char *restrict format)
{
// Check if precision is specified
if (format[0] != '.')
return (0);
// Check dynamic precision
if (format[1] == '*') {
opt->precision = va_arg(opt->ap, int);
return (2);
}
// Get static precision
int i = 0;
opt->precision = 0;
while (format[++i] >= '0' && format[i] <= '9')
opt->precision = (opt->precision * 10) + (format[i] - '0');
// Check default precision
if (i == 0)
opt->precision = 1;
return (i);
}
static int get_lenght(struct printf_opt *opt, const char *restrict format)
{
opt->lenght = -1;
switch (format[0]) {
case 'h':
opt->lenght = (format[1] == 'h') ? 1 : 0;
break;
case 'l':
opt->lenght = (format[1] == 'l') ? 3 : 2;
break;
case 'j':
opt->lenght = 4;
break;
case 'z':
opt->lenght = 5;
break;
case 't':
opt->lenght = 6;
break;
default:
return (0);
}
return ((opt->lenght == 1 || opt->lenght == 3) ? 2 : 1);
}
int printf_get_options(struct printf_opt *opt, const char *restrict format)
{
int i;
// Wipe internal format infos
opt->sign = '\0';
opt->base[0] = '\0';
opt->base[1] = '\0';
// Get generals opetions
i = get_flags(opt, &format[0]);
i += get_width(opt, &format[i]);
i += get_precision(opt, &format[i]);
i += get_lenght(opt, &format[i]);
// Check upper case actions
opt->uppercase = (format[i] == 'X') ? 1 : 0;
return (i);
}