小程序 - 最大递增数

char *maxAscStr(char *str) 
{
    char *begin, *cur;
    int len, max;
    
    if (!str || !str[0])
        return NULL;
    for (cur = begin = str, max = len = 1, str++; str[0]; str++, len++)
        if (str[0] <= str[-1]) {
            if (len > max) {
                max = len;
                begin = cur;
            }
            len = 0;
            cur = str;
        }
    if (len > max) {
        max = len;
        begin = cur;
    }
    if ((cur = calloc(max + 1, 1)) == NULL)
        return NULL;
    memcpy(cur, begin, max);
    return cur;
}