Be a bit more verbose on error.

CMakeLists.txt

@@ -9,6 +9,8 @@ project(Galvinise VERSION 0.2 LANGUAGES C)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED True)
 
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
 add_compile_options(-Wall -Wextra)
 
 include(FindPkgConfig)

src/CMakeLists.txt

@@ -4,6 +4,7 @@ add_library(galvinise galv.c diskslurp.c blam_buf.c blam_direct.c blam_writev.c
 list(APPEND EXTRA_LIBS galvinise)
 
 
+
 add_executable(galv main.c)
 target_link_libraries(galv PUBLIC galvinise ${TALLOC_LDFLAGS} ${CHECK_LDFLAGS} ${LUA_LDFLAGS})
 

src/Makefile

@@ -7,7 +7,7 @@ PREFIX=/usr/local
 .PHONY:tags
 
 ifndef CFLAGS
-CFLAGS=-Wall -O2 -g3 -std=c99
+CFLAGS=-Wall -O2 -g3 -std=c2x
 endif
 
 include ../config.mk

src/check.c

@@ -1,4 +1,5 @@
 #include <check.h>
+#include <stdarg.h>
 #include <talloc.h>
 
 #include "galv_check.h"

src/galv.c

@@ -551,6 +551,25 @@ walk_symbol(const char *sym, int len) {
 	return 0;
 }
 
+__attribute__((noreturn)) static void
+handle_lua_error(lua_State *L, int errcode) {
+	switch (errcode) {
+	case LUA_ERRRUN:
+		fprintf(stderr, "Lua runtime error: %s\n", lua_tostring(L, -1));
+		break;
+	case LUA_ERRMEM:
+		fprintf(stderr, "Lua memory error: %s\n", lua_tostring(L, -1));
+		break;
+	case LUA_ERRERR:
+		fprintf(stderr, "Lua error handling error: %s\n", lua_tostring(L, -1));
+		break;
+	case LUA_ERRSYNTAX:
+		fprintf(stderr, "Lua syntax error: %s\n", lua_tostring(L, -1));
+		break;
+	}
+	exit(1);
+}
+
 // FIXME: Should get the line number or something.
 static int
 eval_lua(struct blam *blam, const char *block, int len) {
@@ -566,7 +585,11 @@ eval_lua(struct blam *blam, const char *block, int len) {
 		exit(1);
 	}
 #endif
-	lua_pcall(L, 0, 1, 0); // FIXME: Should use LUA_MULTRET
+	int rv = lua_pcall(L, 0, 1, 0); // FIXME: Should use LUA_MULTRET
+	if (rv != 0){
+		handle_lua_error(L, rv);
+	}
+
 	if (lua_isstring(L, -1)) {
 		blam->write_string(blam, lua_tostring(L, -1));
 	}

src/main.c

@@ -1,4 +1,4 @@
-#define _GNU_SOURCE 1
+//#define _GNU_SOURCE 1
 
 #include <assert.h>
 #include <ctype.h>