fig-utils: Guile FFI

1 files changed, 43 insertions, 0 deletions

diff --git a/fig-utils/csrc/fig.c b/fig-utils/csrc/fig.c
new file mode 100644
index 0000000..e828e71
--- /dev/null
+++ b/fig-utils/csrc/fig.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <libguile.h>
+
+typedef struct check_answer_args {
+    char *code;
+    char *data;
+} check_answer_args;
+SCM check_answer_catch_body(void *data) {
+    check_answer_args *args = (check_answer_args *) data;
+    // SCM handler = scm_c_eval_string(args->code);
+    // SCM res = scm_call_1(handler, scm_from_utf8_string(args->data));
+    SCM readport = scm_open_input_string(scm_from_utf8_string(args->code));
+    SCM func = scm_read(readport);
+    SCM call = scm_list_2(func, scm_from_utf8_string(args->data));
+    SCM eval = scm_c_public_ref("ice-9 sandbox", "eval-in-sandbox");
+    return scm_call_1(eval, call);
+}
+SCM check_answer_catch_handler(void *data, SCM key, SCM args) {
+    SCM format = scm_c_public_ref("ice-9 format", "format");
+    SCM fmt = scm_from_utf8_string("~a: ~a: ~a");
+    SCM func = scm_car(args);
+    SCM afmt = scm_cadr(args);
+    SCM aargs = scm_caddr(args);
+    SCM msg = scm_apply_2(format, SCM_BOOL_F, afmt, aargs);
+    return scm_call_5(format, SCM_BOOL_F, fmt, key, func, msg);
+}
+
+int check_answer(char **failure, char *code, char *data) {
+    scm_init_guile();
+    check_answer_args args = { .code = code, .data = data };
+    SCM res = scm_c_catch(
+        SCM_BOOL_T,
+        check_answer_catch_body, &args,
+        check_answer_catch_handler, NULL,
+        check_answer_catch_handler, NULL);
+    if (scm_is_integer(res)) {
+        *failure = NULL;
+        return scm_to_int(res);
+    } else {
+        *failure = scm_to_utf8_stringn(res, NULL);
+        return 0;
+    }
+}