Unify error messages and checking

1 files changed, 33 insertions, 2 deletions

diff --git a/api/util.c b/api/util.c
index e6f0650..b6f9b49 100644
--- a/api/util.c
+++ b/api/util.c
@@ -4,8 +4,7 @@
 
 UwUVMValue uwuutil_is_type(const char *fnname, UwUVMArgs *args, UwUVMType *type)
 {
-	if (args->num < 1)
-		error("error: %s requires at least one argument\n", fnname);
+	uwuutil_require_min(fnname, args, 1);
 
 	for (size_t i = 0; i < args->num; i++)
 		if (uwuvm_get_arg(args, i).type != type)
@@ -13,3 +12,35 @@ UwUVMValue uwuutil_is_type(const char *fnname, UwUVMArgs *args, UwUVMType *type)
 
 	return uwubool_create(true);
 }
+
+void uwuutil_require_min(const char *fnname, UwUVMArgs *args, size_t n)
+{
+	if (args->num < n) {
+		if (n == 1)
+			error("type error: %s requires at least one optional argument, but none were given\n", fnname);
+		else
+			error("type error: %s requires at least %d arguments, but only %d were given\n", fnname, n, args->num);
+	}
+}
+
+void uwuutil_require_max(const char *fnname, UwUVMArgs *args, size_t n)
+{
+	if (args->num > n) {
+		if (n == 1)
+			error("type error: %s accepts one optional argument, but %d were given\n", fnname, args->num);
+		else
+			error("type error: %s does not take more than %d arguments, but %d were given\n", fnname, args->num);
+	}
+}
+
+void uwuutil_require_exact(const char *fnname, UwUVMArgs *args, size_t n)
+{
+	if (args->num != n) {
+		if (n == 0)
+			error("type error: %s does not take any arguments, but %d were given\n", fnname, args->num);
+		else if (n == 1)
+			error("type error: %s requires exactly one argument, but %d were given\n", fnname, args->num);
+		else
+			error("type error: %s requires exactly %d arguments, but %d were given\n", fnname, n, args->num);
+	}
+}