1 files changed, 18 insertions, 0 deletions
diff --git a/src/util.cff b/src/util.cff
index 33bce84..c3a08cb 100644
--- a/src/util.cff
+++ b/src/util.cff
@@ -47,3 +47,21 @@ extern fn addfilepath(s *const u8) int {
    filepaths[i] = s;
    return i;
 }
+
+fn fileid2path(id int) *const u8 {
+   assert(id >= 0 and id < filepaths.#len, "fileid");
+   let s = filepaths[id];
+   assert(s != #null, "fileid");
+   return s;
+}
+
+extern fn fatal(P *Parser, loc Loc, fmt *const u8, ...) void {
+   let ap va_list #?;
+   ap->start(fmt);
+
+   efmt("%s:%i:%i: error: ", fileid2path(loc.fileid), loc.line, loc.col);
+   vefmt(fmt, ap);
+   efmt("\n");
+   ap->end();
+   exit(1);
+}