Split string by a substring

Question

I have following string:

char str[] = \"A/USING=B)\";

I want to split to get separate A and B values with /

Answer 1

Here is a little function to do this. It works exactly like strtok_r except that the delimiter is taken as a delimiting string, not a list of delimiting characters.

char *strtokstr_r(char *s, char *delim, char **save_ptr)
{
    char *end;
    if (s == NULL)
        s = *save_ptr;

    if (s == NULL || *s == '\0')
    {
        *save_ptr = s;
        return NULL;
    }

    // Skip leading delimiters.
    while (strstr(s,delim)==s) s+=strlen(delim);
    if (*s == '\0')
    {
        *save_ptr = s;
        return NULL;
    }

    // Find the end of the token.
    end = strstr (s, delim);
    if (end == NULL)
    {
        *save_ptr = s + strlen(s);
        return s;
    }

    // Terminate the token and make *SAVE_PTR point past it.
    memset(end, 0, strlen(delim));
    *save_ptr = end + strlen(delim);
    return s;
}