ap_os_escape_path with partial=0?

[Stas Bekman]

Can someone please explain what this function does when partial=0? why 
does it prepend "./" only if the path includes ":/" in it? what's 
happening here? the API doesn't document this nuance. What kind of input 
does it take care of? I can see it used by mod_autoindex, but may be it 
never hits this condition?

Shouldn't it go the other way around? i.e. not append ./ if it finds ':/' 
in the string?

        if (!(colon && (!slash || colon < slash))) {
            *d++ = '.';
            *d++ = '/';
        }
Thanks.
Here is the whole function for your convenience:
AP_DECLARE(char *) ap_os_escape_path(apr_pool_t *p, const char *path, int 
partial)
{
    char *copy = apr_palloc(p, 3 * strlen(path) + 3);
    const unsigned char *s = (const unsigned char *)path;
    unsigned char *d = (unsigned char *)copy;
    unsigned c;

    if (!partial) {
        const char *colon = ap_strchr_c(path, ':');
        const char *slash = ap_strchr_c(path, '/');
        if (colon && (!slash || colon < slash)) {
            *d++ = '.';
            *d++ = '/';
        }
    }
    while ((c = *s)) {
        if (TEST_CHAR(c, T_OS_ESCAPE_PATH)) {
            d = c2x(c, d);
        }
        else {
            *d++ = c;
        }
        ++s;
    }
    *d = '\0';
    return copy;
}
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