From 194e87a88290a4b3025436709e1f3064aecd00cd Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Sat, 30 Aug 2025 00:39:45 +0900
Subject: feat: check invalid #elif* and #endif

---
 src/preprocess.c |  7 +++++++
 tests/106.sh     | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 tests/106.sh

diff --git a/src/preprocess.c b/src/preprocess.c
index 3f0161d..e47a390 100644
--- a/src/preprocess.c
+++ b/src/preprocess.c
@@ -1157,8 +1157,15 @@ static void preprocess_group_part(Preprocessor* pp) {
     if (tok->kind == TokenKind_pp_directive_if || tok->kind == TokenKind_pp_directive_ifdef ||
         tok->kind == TokenKind_pp_directive_ifndef) {
         preprocess_if_section(pp);
+    } else if (tok->kind == TokenKind_pp_directive_elif || tok->kind == TokenKind_pp_directive_elifdef ||
+               tok->kind == TokenKind_pp_directive_elifndef || tok->kind == TokenKind_pp_directive_else ||
+               tok->kind == TokenKind_pp_directive_endif) {
+        fatal_error("%s:%d: unexpected '%s'; no corresponding '#if'*", tok->loc.filename, tok->loc.line,
+                    token_kind_stringify(tok->kind));
     } else if (tok->kind == TokenKind_pp_directive_include) {
         preprocess_include_directive(pp);
+    } else if (tok->kind == TokenKind_pp_directive_embed) {
+        preprocess_embed_directive(pp);
     } else if (tok->kind == TokenKind_pp_directive_define) {
         preprocess_define_directive(pp);
     } else if (tok->kind == TokenKind_pp_directive_undef) {
diff --git a/tests/106.sh b/tests/106.sh
new file mode 100644
index 0000000..2a61a33
--- /dev/null
+++ b/tests/106.sh
@@ -0,0 +1,50 @@
+cat <<'EOF' > expected
+main.c:1: unexpected '#elif'; no corresponding '#if'*
+EOF
+test_compile_error <<'EOF'
+#elif
+#endif
+
+int main() {}
+EOF
+
+cat <<'EOF' > expected
+main.c:1: unexpected '#endif'; no corresponding '#if'*
+EOF
+test_compile_error <<'EOF'
+#endif
+
+int main() {}
+EOF
+
+cat <<'EOF' > expected
+main.c:1: unexpected '#else'; no corresponding '#if'*
+EOF
+test_compile_error <<'EOF'
+#else
+#endif
+
+int main() {}
+EOF
+
+cat <<'EOF' > expected
+main.c:4: expected '#endif', but got '<eof>'
+EOF
+test_compile_error <<'EOF'
+#if 1
+
+int main() {}
+EOF
+
+cat <<'EOF' > a.h
+#if 1
+EOF
+cat <<'EOF' > expected
+./a.h:2: expected '#endif', but got '<eof>'
+EOF
+test_compile_error <<'EOF'
+#include "a.h"
+#endif
+
+int main() {}
+EOF
-- 
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