Add qsort test

SingleSource/UnitTests/qsort.c

@@ -0,0 +1,36 @@
+// Copyright 2024 LLVM-MOS
+//
+// Licensed under the Apache License, Version 2.0 with LLVM Exceptions,
+// See https://github.com/llvm-mos/llvm-mos-sdk/blob/main/LICENSE for license
+// information.
+
+#undef NDEBUG
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Originally from the Public Domain C Library (PDCLib)
+
+
+static int compare(const void *left, const void *right) {
+  return *((unsigned char *)left) - *((unsigned char *)right);
+}
+
+int main(void) {
+  char presort[] = {"shreicnyjqpvozxmbt"};
+  char sorted1[] = {"bcehijmnopqrstvxyz"};
+  char sorted2[] = {"bticjqnyozpvreshxm"};
+  char s[19];
+  strcpy(s, presort);
+  qsort(s, 18, 1, compare);
+  assert(strcmp(s, sorted1) == 0);
+  strcpy(s, presort);
+  qsort(s, 9, 2, compare);
+  assert(strcmp(s, sorted2) == 0);
+  strcpy(s, presort);
+  qsort(s, 1, 1, compare);
+  assert(strcmp(s, presort) == 0);
+  qsort(s, 100, 0, compare);
+  assert(strcmp(s, presort) == 0);
+  return 0;
+}

SingleSource/UnitTests/qsort.reference_output

@@ -0,0 +1 @@
+exit 0