Protect from zero random seeds (#447)

vtereshkov · vtereshkov · commit 8a1610fbb0ce · 2024-09-28T22:14:57.000+04:00
diff --git a/playground/umka.js b/playground/umka.js
diff --git a/runtime/std.um b/runtime/std.um
@@ -325,7 +325,9 @@ const randMax* = 0x7FFFFFFF
 randSeed := uint(1)
 
 fn srand*(seed: int) {
-    randSeed = seed
+    if seed > 0 {
+        randSeed = seed
+    }
 }
 
 fn rand*(): int {
diff --git a/src/umka_runtime_src.h b/src/umka_runtime_src.h
@@ -336,7 +336,9 @@ static const char *runtimeModuleSources[] = {
 "randSeed := uint(1)\n"
 "\n"
 "fn srand*(seed: int) {\n"
-"    randSeed = seed\n"
+"    if seed > 0 {\n"
+"        randSeed = seed\n"
+"    }\n"
 "}\n"
 "\n"
 "fn rand*(): int {\n"
