strtok_r for MinGW

Question

strtok_r is the reentrant variant of strtok. It is POSIX-conformant. However, it is missing from MinGW, and I'm trying to compile a program that is using it.

Is there any way I could add a standard implementation of this function, perhaps to the project's own code, or to MinGW's standard library functions?

Answer 1

Since there are some license questions about the code from another answer, here's one that's explicitly public domain:

/* 
 * public domain strtok_r() by Charlie Gordon
 *
 *   from comp.lang.c  9/14/2007
 *
 *      http://groups.google.com/group/comp.lang.c/msg/2ab1ecbb86646684
 *
 *     (Declaration that it's public domain):
 *      http://groups.google.com/group/comp.lang.c/msg/7c7b39328fefab9c
 */

char* strtok_r(
    char *str, 
    const char *delim, 
    char **nextp)
{
    char *ret;

    if (str == NULL)
    {
        str = *nextp;
    }

    str += strspn(str, delim);

    if (*str == '\0')
    {
        return NULL;
    }

    ret = str;

    str += strcspn(str, delim);

    if (*str)
    {
        *str++ = '\0';
    }

    *nextp = str;

    return ret;
}