Isolated emscripten in new lib

lib/emscripten/emtests/test_strings.c

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2016 The Emscripten Authors.  All rights reserved.
+ * Emscripten is available under two separate licenses, the MIT license and the
+ * University of Illinois/NCSA Open Source License.  Both these licenses can be
+ * found in the LICENSE file.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char **argv) {
+  int x = 5, y = 9, magic = 7;  // fool compiler with magic
+  memmove(&x, &y, magic - 7);   // 0 should not crash us
+
+  int xx, yy, zz;
+  char s[32];
+  int cc = sscanf("abc_10.b1_xyz9_543_defg", "abc_%d.%2x_xyz9_%3d_%3s", &xx,
+                  &yy, &zz, s);
+  printf("%d:%d,%d,%d,%s\n", cc, xx, yy, zz, s);
+
+  printf("%d\n", argc);
+  puts(argv[1]);
+  puts(argv[2]);
+  printf("%d\n", atoi(argv[3]) + 2);
+  const char *foolingthecompiler = "\rabcd";
+  printf("%d\n", strlen(foolingthecompiler));  // Tests parsing /0D in llvm -
+                                               // should not be a 0 (end string)
+                                               // then a D!
+  printf("%s\n", NULL);  // Should print '(null)', not the string at address 0,
+                         // which is a real address for us!
+  printf("/* a comment */\n");  // Should not break the generated code!
+  printf("// another\n");       // Should not break the generated code!
+
+  char *strdup_val = strdup("test");
+  printf("%s\n", strdup_val);
+  free(strdup_val);
+
+  {
+    char *one = "one 1 ONE !";
+    char *two = "two 2 TWO ?";
+    char three[1024];
+    memset(three, '.', 1024);
+    three[50] = 0;
+    strncpy(three + argc, one + (argc / 2), argc + 1);
+    strncpy(three + argc * 3, two + (argc / 3), argc + 2);
+    printf("waka %s\n", three);
+  }
+
+  {
+    char *one = "string number one top notch";
+    char *two = "fa la sa ho fi FI FO FUM WHEN WHERE WHY HOW WHO";
+    char three[1000];
+    strcpy(three, &one[argc * 2]);
+    char *four = strcat(three, &two[argc * 3]);
+    printf("cat |%s|\n", three);
+    printf("returned |%s|\n", four);
+  }
+
+  return 0;
+}