feat: implement macro argument prescan

cf. https://gcc.gnu.org/onlinedocs/cpp/Argument-Prescan.html

2 files changed, 19 insertions, 0 deletions

diff --git a/tests/include_stdc.sh b/tests/include_stdc.sh
index 7357bc9..deee597 100644
--- a/tests/include_stdc.sh
+++ b/tests/include_stdc.sh
@@ -3,6 +3,7 @@ EOF
 
 test_diff <<'EOF'
 #include <assert.h>
+#include <ctype.h>
 #include <errno.h>
 #include <limits.h>
 #include <locale.h>
@@ -11,6 +12,8 @@ test_diff <<'EOF'
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
+// #include <stdlib.h>
+// #include <string.h>
 #include <time.h>
 #include <uchar.h>
 
diff --git a/tests/test_macro_operators.sh b/tests/test_macro_operators.sh
index daf8f47..a77d3ca 100644
--- a/tests/test_macro_operators.sh
+++ b/tests/test_macro_operators.sh
@@ -41,3 +41,19 @@ int main() {
 }
 EOF
 
+cat <<'EOF' > expected
+123
+EOF
+test_diff <<'EOF'
+int printf(const char*, ...);
+
+#define F(x) CHECK(G(x))
+#define G(x) CHECK(H(x))
+#define CHECK(x) x
+
+int H(int n) { return n; }
+
+int main() {
+    printf("%d\n", F(123));
+}
+EOF