Locale-independent “atof”?

Question

I\'m parsing GPS status entries in fixed NMEA sentences, where fraction part of geographical minutes comes always after period. However, on systems where locale defines comm

Answer 1

Some of the solutions above did not seem to work, so I propose this as a perfectly failproof solution. Just copy-paste this function and use it instead.

float stor(const char* str) {
    float result = 0;
    float sign = *str == '-' ? str++, -1 : 1;
    while (*str >= '0' && *str <= '9') {
        result *= 10;
        result += *str - '0';
        str++;
    }
    if (*str == ',' || *str == '.') {
        str++;
        float multiplier = 0.1;
        while (*str >= '0' && *str <= '9') {
            result += (*str - '0') * multiplier;
            multiplier /= 10;
            str++;
        }
    }
    result *= sign;
    if (*str == 'e' || *str == 'E') {
        str++;
        float powerer = *str == '-'? str++, 0.1 : 10;
        float power = 0;
        while (*str >= '0' && *str <= '9') {
            power *= 10;
            power += *str - '0';
            str++;
        }
        result *= pow(powerer, power);
    }
    return result;
}