strtol10.c

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#include "strtol10.h"

bool strtoul10(const char *first, const char *last, unsigned long *val)
{
    // Check for no input
    if (*first == '\0')
        return false;

    *val = 0;
    for(/*nop*/; first != last && *first != '\0'; ++first)
    {
        if ((*first < '0') || (*first > '9'))
            return false;

        *val = (*val * 10L) + (*first - '0');
    }

    return true;
}


bool strtol10(const char *first, const char *last, long *val)
{
    bool negative = false;

    if (*first == '+')
        ++first; /* skip unary plus sign */
    else if (*first == '-')
    {
        negative = true;
        ++first;
    }

    bool result = strtoul10(first, last, (unsigned long *)val);

    if (negative)
        *val = - *val;

    return result;
}