Add error_func and error_opaque getters to libtcc

libtcc.c

@@ -518,13 +518,22 @@ static void error1(TCCState *s1, int is_warning, const char *fmt, va_list ap)
         s1->nb_errors++;
 }
 
-LIBTCCAPI void tcc_set_error_func(TCCState *s, void *error_opaque,
-                        void (*error_func)(void *opaque, const char *msg))
+LIBTCCAPI void tcc_set_error_func(TCCState *s, void *error_opaque, TCCErrorFunc error_func)
 {
     s->error_opaque = error_opaque;
     s->error_func = error_func;
 }
 
+LIBTCCAPI TCCErrorFunc tcc_get_error_func(TCCState *s)
+{
+    return s->error_func;
+}
+
+LIBTCCAPI void *tcc_get_error_opaque(TCCState *s)
+{
+    return s->error_opaque;
+}
+
 /* error without aborting current compilation */
 PUB_FUNC void tcc_error_noabort(const char *fmt, ...)
 {

libtcc.h

@@ -13,6 +13,8 @@ struct TCCState;
 
 typedef struct TCCState TCCState;
 
+typedef void (*TCCErrorFunc)(void *opaque, const char *msg);
+
 /* create a new TCC compilation context */
 LIBTCCAPI TCCState *tcc_new(void);
 
@@ -23,8 +25,13 @@ LIBTCCAPI void tcc_delete(TCCState *s);
 LIBTCCAPI void tcc_set_lib_path(TCCState *s, const char *path);
 
 /* set error/warning display callback */
-LIBTCCAPI void tcc_set_error_func(TCCState *s, void *error_opaque,
-    void (*error_func)(void *opaque, const char *msg));
+LIBTCCAPI void tcc_set_error_func(TCCState *s, void *error_opaque, TCCErrorFunc error_func);
+
+/* return error/warning callback */
+LIBTCCAPI TCCErrorFunc tcc_get_error_func(TCCState *s);
+
+/* return error/warning callback opaque pointer */
+LIBTCCAPI void *tcc_get_error_opaque(TCCState *s);
 
 /* set options as from command line (multiple supported) */
 LIBTCCAPI void tcc_set_options(TCCState *s, const char *str);

tests/libtcc_test.c

@@ -6,9 +6,15 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <assert.h>
 
 #include "libtcc.h"
 
+void handle_error(void *opaque, const char *msg)
+{
+    fprintf(opaque, "%s\n", msg);
+}
+
 /* this function is called by the generated code */
 int add(int a, int b)
 {
@@ -53,6 +59,14 @@ int main(int argc, char **argv)
         exit(1);
     }
 
+    assert(tcc_get_error_func(s) == NULL);
+    assert(tcc_get_error_opaque(s) == NULL);
+
+    tcc_set_error_func(s, stderr, handle_error);
+
+    assert(tcc_get_error_func(s) == handle_error);
+    assert(tcc_get_error_opaque(s) == stderr);
+
     /* if tcclib.h and libtcc1.a are not installed, where can we find them */
     for (i = 1; i < argc; ++i) {
         char *a = argv[i];