#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>

#ifdef isdigit
#undef isdigit
#endif
#define isdigit(c) ((c) >= '0' && (c) <= '9')
// should test : ]212,123  - 213 -1.0 -1.1[ vvvvv

float strtof__(const char *start, char **end);

int main()
{
    char *end, *start = " -12.1"; //-0.11 123 24.7 212.123

    end = start;
	while (*start)
		{
		printf("Strtof__ is : %f\n", strtof__(start, &end));
//		printf("Strtod is : %f\n", strtof(start, &end));
		printf("end is : %s\n", end);

		if (start == end)
            break;
		start = end;
		}
    return 0;
}

float strtof__(const char *start, char **end){

    // skip leading space characters
	while (*start && *start == ' ') {
		start++;
	}

	int negate = 1;
	if(*start == '-')
        negate = -1;

    if(*start == '+')
        start++;


    int retvalue = 0;
    while(isdigit(*start)){
        printf("Shit start: %s\n", start);
        retvalue *= 10;
        retvalue = retvalue + (*start - '0');
        start++;
    }
//    printf("Shit retvalue: %d and start: %s\n", retvalue, start);

    bool hasFp = false;
    if(*start == '.'){
        hasFp = true;
        start++;
    }

    int fpsize = 1, fpvalue = 0;
    while(isdigit(*start)){
        fpsize *= 10;
        fpvalue *= 10;
        fpvalue = fpvalue + (*start - '0');
        start++;
    }

    *end = (char *)start;
//    printf("Before return start : %s\n", start);
//    printf("Shit fpvalue: %f\n", retvalue + fpvalue * 1.0/fpsize);

	return negate * (retvalue + fpvalue * (1.0/fpsize));
}