mod_include.c

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                    continue;
                }
            }
            if (!current->right->done) {
                switch (current->right->token.type) {
                case token_string:
                    parse_string(r, current->right->token.value,
                                 buffer, sizeof(buffer), 0);
                    ap_cpystrn(current->right->token.value, buffer,
                            sizeof(current->right->token.value));
		    current->right->value = (current->right->token.value[0] != '\0');
                    current->right->done = 1;
                    break;
                default:
                    current = current->right;
                    continue;
                }
            }
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "     Left: ", current->left->value ? "1" : "0",
                   "\n", NULL);
            ap_rvputs(r, "     Right: ", current->right->value ? "1" : "0",
                   "\n", NULL);
#endif
            if (current->token.type == token_and) {
                current->value = current->left->value && current->right->value;
            }
            else {
                current->value = current->left->value || current->right->value;
            }
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "     Returning ", current->value ? "1" : "0",
                   "\n", NULL);
#endif
            current->done = 1;
            current = current->parent;
            break;

        case token_eq:
        case token_ne:
#ifdef DEBUG_INCLUDE
            ap_rputs("     Evaluate eq/ne\n", r);
#endif
            if ((current->left == (struct parse_node *) NULL) ||
                (current->right == (struct parse_node *) NULL) ||
                (current->left->token.type != token_string) ||
                (current->right->token.type != token_string)) {
                ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                            "Invalid expression \"%s\" in file %s",
                            expr, r->filename);
                ap_rputs(error, r);
                goto RETURN;
            }
            parse_string(r, current->left->token.value,
                         buffer, sizeof(buffer), 0);
            ap_cpystrn(current->left->token.value, buffer,
			sizeof(current->left->token.value));
            parse_string(r, current->right->token.value,
                         buffer, sizeof(buffer), 0);
            ap_cpystrn(current->right->token.value, buffer,
			sizeof(current->right->token.value));
            if (current->right->token.value[0] == '/') {
                int len;
                len = strlen(current->right->token.value);
                if (current->right->token.value[len - 1] == '/') {
                    current->right->token.value[len - 1] = '\0';
                }
                else {
                    ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                                "Invalid rexp \"%s\" in file %s",
                                current->right->token.value, r->filename);
                    ap_rputs(error, r);
                    goto RETURN;
                }
#ifdef DEBUG_INCLUDE
                ap_rvputs(r, "     Re Compare (", current->left->token.value,
                  ") with /", &current->right->token.value[1], "/\n", NULL);
#endif
                current->value =
                    re_check(r, current->left->token.value,
                             &current->right->token.value[1]);
            }
            else {
#ifdef DEBUG_INCLUDE
                ap_rvputs(r, "     Compare (", current->left->token.value,
                       ") with (", current->right->token.value, ")\n", NULL);
#endif
                current->value =
                    (strcmp(current->left->token.value,
                            current->right->token.value) == 0);
            }
            if (current->token.type == token_ne) {
                current->value = !current->value;
            }
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "     Returning ", current->value ? "1" : "0",
                   "\n", NULL);
#endif
            current->done = 1;
            current = current->parent;
            break;
        case token_ge:
        case token_gt:
        case token_le:
        case token_lt:
#ifdef DEBUG_INCLUDE
            ap_rputs("     Evaluate ge/gt/le/lt\n", r);
#endif
            if ((current->left == (struct parse_node *) NULL) ||
                (current->right == (struct parse_node *) NULL) ||
                (current->left->token.type != token_string) ||
                (current->right->token.type != token_string)) {
                ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                            "Invalid expression \"%s\" in file %s",
                            expr, r->filename);
                ap_rputs(error, r);
                goto RETURN;
            }
            parse_string(r, current->left->token.value,
                         buffer, sizeof(buffer), 0);
            ap_cpystrn(current->left->token.value, buffer,
			sizeof(current->left->token.value));
            parse_string(r, current->right->token.value,
                         buffer, sizeof(buffer), 0);
            ap_cpystrn(current->right->token.value, buffer,
			sizeof(current->right->token.value));
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "     Compare (", current->left->token.value,
                   ") with (", current->right->token.value, ")\n", NULL);
#endif
            current->value =
                strcmp(current->left->token.value,
                       current->right->token.value);
            if (current->token.type == token_ge) {
                current->value = current->value >= 0;
            }
            else if (current->token.type == token_gt) {
                current->value = current->value > 0;
            }
            else if (current->token.type == token_le) {
                current->value = current->value <= 0;
            }
            else if (current->token.type == token_lt) {
                current->value = current->value < 0;
            }
            else {
                current->value = 0;     /* Don't return -1 if unknown token */
            }
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "     Returning ", current->value ? "1" : "0",
                   "\n", NULL);
#endif
            current->done = 1;
            current = current->parent;
            break;

        case token_not:
            if (current->right != (struct parse_node *) NULL) {
                if (!current->right->done) {
                    current = current->right;
                    continue;
                }
                current->value = !current->right->value;
            }
            else {
                current->value = 0;
            }
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "     Evaluate !: ", current->value ? "1" : "0",
                   "\n", NULL);
#endif
            current->done = 1;
            current = current->parent;
            break;

        case token_group:
            if (current->right != (struct parse_node *) NULL) {
                if (!current->right->done) {
                    current = current->right;
                    continue;
                }
                current->value = current->right->value;
            }
            else {
                current->value = 1;
            }
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "     Evaluate (): ", current->value ? "1" : "0",
                   "\n", NULL);
#endif
            current->done = 1;
            current = current->parent;
            break;

        case token_lbrace:
            ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                        "Unmatched '(' in \"%s\" in file %s",
                        expr, r->filename);
            ap_rputs(error, r);
            goto RETURN;

        case token_rbrace:
            ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                        "Unmatched ')' in \"%s\" in file %s",
                        expr, r->filename);
            ap_rputs(error, r);
            goto RETURN;

        default:
            ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
			"bad token type");
            ap_rputs(error, r);
            goto RETURN;
        }
    }

    retval = (root == (struct parse_node *) NULL) ? 0 : root->value;
  RETURN:
    ap_destroy_pool(expr_pool);
    return (retval);
}

static int handle_if(FILE *in, request_rec *r, const char *error,
                     int *conditional_status, int *printing)
{
    char tag[MAX_STRING_LEN];
    char *tag_val;
    char *expr;

    expr = NULL;
    while (1) {
        tag_val = get_tag(r, in, tag, sizeof(tag), 0);
        if (!tag_val || *tag == '\0') {
            return 1;
        }
        else if (!strcmp(tag, "done")) {
	    if (expr == NULL) {
		ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
			    "missing expr in if statement: %s",
			    r->filename);
		ap_rputs(error, r);
		return 1;
	    }
            *printing = *conditional_status = parse_expr(r, expr, error);
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "**** if conditional_status=\"",
                   *conditional_status ? "1" : "0", "\"\n", NULL);
#endif
            return 0;
        }
        else if (!strcmp(tag, "expr")) {
            expr = tag_val;
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "**** if expr=\"", expr, "\"\n", NULL);
#endif
        }
        else {
            ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                        "unknown parameter \"%s\" to tag if in %s",
                        tag, r->filename);
            ap_rputs(error, r);
        }
    }
}

static int handle_elif(FILE *in, request_rec *r, const char *error,
                       int *conditional_status, int *printing)
{
    char tag[MAX_STRING_LEN];
    char *tag_val;
    char *expr;

    expr = NULL;
    while (1) {
        tag_val = get_tag(r, in, tag, sizeof(tag), 0);
        if (!tag_val || *tag == '\0') {
            return 1;
        }
        else if (!strcmp(tag, "done")) {
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "**** elif conditional_status=\"",
                   *conditional_status ? "1" : "0", "\"\n", NULL);
#endif
            if (*conditional_status) {
                *printing = 0;
                return (0);
            }
	    if (expr == NULL) {
		ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
			    "missing expr in elif statement: %s",
			    r->filename);
		ap_rputs(error, r);
		return 1;
	    }
            *printing = *conditional_status = parse_expr(r, expr, error);
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "**** elif conditional_status=\"",
                   *conditional_status ? "1" : "0", "\"\n", NULL);
#endif
            return 0;
        }
        else if (!strcmp(tag, "expr")) {
            expr = tag_val;
#ifdef DEBUG_INCLUDE
            ap_rvputs(r, "**** if expr=\"", expr, "\"\n", NULL);
#endif
        }
        else {
            ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                        "unknown parameter \"%s\" to tag if in %s",
                        tag, r->filename);
            ap_rputs(error, r);
        }
    }
}

static int handle_else(FILE *in, request_rec *r, const char *error,
                       int *conditional_status, int *printing)
{
    char tag[MAX_STRING_LEN];

    if (!get_tag(r, in, tag, sizeof(tag), 1)) {
        return 1;
    }
    else if (!strcmp(tag, "done")) {
#ifdef DEBUG_INCLUDE
        ap_rvputs(r, "**** else conditional_status=\"",
               *conditional_status ? "1" : "0", "\"\n", NULL);
#endif
        *printing = !(*conditional_status);
        *conditional_status = 1;
        return 0;
    }
    else {
        ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                    "else directive does not take tags in %s",
		    r->filename);
        if (*printing) {
            ap_rputs(error, r);
        }
        return -1;
    }
}

static int handle_endif(FILE *in, request_rec *r, const char *error,
                        int *conditional_status, int *printing)
{
    char tag[MAX_STRING_LEN];

    if (!get_tag(r, in, tag, sizeof(tag), 1)) {
        return 1;
    }
    else if (!strcmp(tag, "done")) {
#ifdef DEBUG_INCLUDE
        ap_rvputs(r, "**** endif conditional_status=\"",
               *conditional_status ? "1" : "0", "\"\n", NULL);
#endif
        *printing = 1;
        *conditional_status = 1;
        return 0;
    }
    else {
        ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                    "endif directive does not take tags in %s",
		    r->filename);
        ap_rputs(error, r);
        return -1;
    }
}

static int handle_set(FILE *in, request_rec *r, const char *error)
{
    char tag[MAX_STRING_LEN];
    char parsed_string[MAX_STRING_LEN];
    char *tag_val;
    char *var;

    var = (char *) NULL;
    while (1) {
        if (!(tag_val = get_tag(r, in, tag, sizeof(tag), 1))) {
            return 1;
        }
        else if (!strcmp(tag, "done")) {
            return 0;
        }
        else if (!strcmp(tag, "var")) {
            var = tag_val;
        }
        else if (!strcmp(tag, "value")) {
            if (var == (char *) NULL) {
                ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                            "variable must precede value in set directive in %s",
			    r->filename);
                ap_rputs(error, r);
                return -1;
            }
            parse_string(r, tag_val, parsed_string, sizeof(parsed_string), 0);
            ap_table_setn(r->subprocess_env, var, ap_pstrdup(r->pool, parsed_string));
        }
        else {
            ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
                        "Invalid tag for set directive in %s", r->filename);
            ap_rputs(error, r);
            return -1;
        }
    }
}

static int handle_printenv(FILE *in, request_rec *r, const char *error)
{
    char tag[MAX_STRING_LEN];
    char *tag_val;
    array_header *arr = ap_table_elts(r->subprocess_env);
    table_entry *elts = (table_entry *) arr->elts;
    int i;

    if (!(tag_val = get_tag(r, in, tag, sizeof(tag), 1))) {
        return 1;
    }
    else if (!strcmp(tag, "done")) {
        for (i = 0; i < arr->nelts; ++i) {
            ap_rvputs(r, ap_escape_html(r->pool, elts[i].key), "=", 
		ap_escape_html(r->pool, elts[i].val), "\n", NULL);
        }
        return 0;
    }