--- /dev/null
+/*
+ * filter-visitor-ir-validate-string.c
+ *
+ * LTTng filter IR validate string
+ *
+ * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <inttypes.h>
+
+#include <common/macros.h>
+
+#include "filter-ast.h"
+#include "filter-parser.h"
+#include "filter-ir.h"
+
+enum parse_char_result {
+ PARSE_CHAR_UNKNOWN = -2,
+ PARSE_CHAR_WILDCARD = -1,
+ PARSE_CHAR_NORMAL = 0,
+};
+
+static
+enum parse_char_result parse_char(const char **p)
+{
+ switch (**p) {
+ case '\\':
+ (*p)++;
+ switch (**p) {
+ case '\\':
+ case '*':
+ return PARSE_CHAR_NORMAL;
+ default:
+ return PARSE_CHAR_UNKNOWN;
+ }
+ case '*':
+ return PARSE_CHAR_WILDCARD;
+ default:
+ return PARSE_CHAR_NORMAL;
+ }
+}
+
+static
+int validate_string(struct ir_op *node)
+{
+ switch (node->op) {
+ case IR_OP_UNKNOWN:
+ default:
+ fprintf(stderr, "[error] %s: unknown op type\n", __func__);
+ return -EINVAL;
+
+ case IR_OP_ROOT:
+ return validate_string(node->u.root.child);
+ case IR_OP_LOAD:
+ {
+ int ret = 0;
+
+ if (node->data_type == IR_DATA_STRING) {
+ const char *str;
+
+ assert(node->u.load.u.string.value);
+ str = node->u.load.u.string.value;
+
+ for (;;) {
+ enum parse_char_result res;
+
+ if (!(*str)) {
+ break;
+ }
+
+ res = parse_char(&str);
+ str++;
+
+ switch (res) {
+ case PARSE_CHAR_UNKNOWN:
+ ret = -EINVAL;
+ fprintf(stderr,
+ "Unsupported escape character detected.\n");
+ goto end_load;
+ case PARSE_CHAR_NORMAL:
+ default:
+ break;
+ }
+ }
+ }
+end_load:
+ return ret;
+ }
+ case IR_OP_UNARY:
+ return validate_string(node->u.unary.child);
+ case IR_OP_BINARY:
+ {
+ int ret = validate_string(node->u.binary.left);
+
+ if (ret)
+ return ret;
+ return validate_string(node->u.binary.right);
+ }
+ case IR_OP_LOGICAL:
+ {
+ int ret;
+
+ ret = validate_string(node->u.logical.left);
+ if (ret)
+ return ret;
+ return validate_string(node->u.logical.right);
+ }
+ }
+}
+
+LTTNG_HIDDEN
+int filter_visitor_ir_validate_string(struct filter_parser_ctx *ctx)
+{
+ return validate_string(ctx->ir_root);
+}