fxlibc/src/stdio/scanf/scan.c

#include <stdio.h>
#include "../stdio_p.h"
#include "../../stdlib/stdlib_p.h"

void __scanf_start(struct __scanf_input *__in)
{

    if(__in->fp)
        __in->buffer = fgetc(__in->fp);
    else {
        __in->buffer = *__in->str;
        __in->str += (__in->buffer != 0);
    }
}

int __scanf_fetch(struct __scanf_input *__in)
{
	if(__in->fp)
		return fgetc(__in->fp);

	int c = *__in->str;
	if(c == 0)
		return EOF;
	__in->str++;
	return c;
}

void __scanf_end(struct __scanf_input *__in)
{
	if(__in->buffer == EOF)
		return;

	if(__in->fp)
		ungetc(__in->buffer, __in->fp);
	else
		__in->str--;
}