Function parseargline

modules/mappers/mod_rewrite.c:2930–3013

* own command line parser for RewriteRule and RewriteCond, * which doesn't have the '\\' problem. * (returns true on error) * * XXX: what an inclined parser. Seems we have to leave it so * for backwards compat. *sigh* */

 *      for backwards compat. *sigh*
 */
static int parseargline(char *str, char **a1, char **a2, char **a2_end, char **a3)
{
    char quote;

    while (apr_isspace(*str)) {
        ++str;
    }

    /*
     * determine first argument
     */
    quote = (*str == '"' || *str == '\'') ? *str++ : '\0';
    *a1 = str;

    for (; *str; ++str) {
        if ((apr_isspace(*str) && !quote) || (*str == quote)) {
            break;
        }
        if (*str == '\\' && apr_isspace(str[1])) {
            ++str;
            continue;
        }
    }

    if (!*str) {
        return 1;
    }
    *str++ = '\0';

    while (apr_isspace(*str)) {
        ++str;
    }

    /*
     * determine second argument
     */
    quote = (*str == '"' || *str == '\'') ? *str++ : '\0';
    *a2 = str;

    for (; *str; ++str) {
        if ((apr_isspace(*str) && !quote) || (*str == quote)) {
            break;
        }
        if (*str == '\\' && apr_isspace(str[1])) {
            ++str;
            continue;
        }
    }

    if (!*str) {
        *a3 = NULL; /* 3rd argument is optional */
        *a2_end = str;
        return 0;
    }
    *a2_end = str;
    *str++ = '\0';

    while (apr_isspace(*str)) {