ncd: Add dummy functions for testing.

ncd/CMakeLists.txt

@@ -146,6 +146,7 @@ set(NCDINTERPRETER_SOURCES
     modules/log.c
     modules/buffer.c
     modules/getenv.c
+    modules/basic_functions.c
     ${NCD_ADDITIONAL_SOURCES}
 )
 set(NCDINTERPRETER_LIBS

ncd/modules/basic_functions.c

@@ -0,0 +1,61 @@
+/**
+ * @file basic_functions.c
+ * @author Ambroz Bizjak <ambrop7@gmail.com>
+ * 
+ * @section LICENSE
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stddef.h>
+
+#include <ncd/NCDModule.h>
+
+static int error_eval (NCDEvaluatorArgs args, NCDValMem *mem, NCDValRef *out, struct NCDModuleFunction_eval_params const *params)
+{
+    return 0;
+}
+
+static int identity_eval (NCDEvaluatorArgs args, NCDValMem *mem, NCDValRef *out, struct NCDModuleFunction_eval_params const *params)
+{
+    if (NCDEvaluatorArgs_Count(&args) != 1) {
+        return 0;
+    }
+    return NCDEvaluatorArgs_EvalArg(&args, 0, mem, out);
+}
+
+static struct NCDModuleFunction const functions[] = {
+    {
+        .func_name = "__error__",
+        .func_eval = error_eval
+    }, {
+        .func_name = "__identity__",
+        .func_eval = identity_eval
+    }, {
+        .func_name = NULL
+    }
+};
+
+const struct NCDModuleGroup ncdmodule_basic_functions = {
+    .functions = functions
+};

ncd/modules/modules.h

@@ -80,6 +80,7 @@ extern const struct NCDModuleGroup ncdmodule_substr;
 extern const struct NCDModuleGroup ncdmodule_log;
 extern const struct NCDModuleGroup ncdmodule_buffer;
 extern const struct NCDModuleGroup ncdmodule_getenv;
+extern const struct NCDModuleGroup ncdmodule_basic_functions;
 #ifndef BADVPN_EMSCRIPTEN
 extern const struct NCDModuleGroup ncdmodule_regex_match;
 extern const struct NCDModuleGroup ncdmodule_run;
@@ -166,6 +167,7 @@ static const struct NCDModuleGroup *ncd_modules[] = {
     &ncdmodule_log,
     &ncdmodule_buffer,
     &ncdmodule_getenv,
+    &ncdmodule_basic_functions,
 #ifndef BADVPN_EMSCRIPTEN
     &ncdmodule_regex_match,
     &ncdmodule_run,