Branch imports for masters.

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diff --git a/mps/code/testlib.c b/mps/code/testlib.c
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+++ b/mps/code/testlib.c
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+/* impl.c.testlib: TEST LIBRARY
+ *
+ * $HopeName: MMsrc!testlib.c(trunk.22) $
+ * Copyright (C) 2000 Harlequin Limited.  All rights reserved.
+ *
+ * .purpose: A library of functions that may be of use to unit tests.
+ */
+
+#include "testlib.h"
+#include "mps.h"
+#include "mpm.h"
+#include <math.h>
+#include <stdlib.h>
+#ifdef MPS_OS_IA
+struct itimerspec; /* stop complaints from time.h */
+#endif
+#include <time.h>
+
+
+/* rnd -- a random number generator
+ *
+ * I nabbed it from "ML for the Working Programmer"
+ * Originally from:
+ * Stephen K Park & Keith W Miller (1988). Random number generators:
+ * good one are to find.  Communications of the ACM, 31:1192-1201
+ */
+
+unsigned long rnd(void)
+{
+  static unsigned long seed = 1;
+  double s;
+  s = seed;
+  s *= 16807.0;
+  s = fmod(s, 2147483647.0);  /* 2^31 - 1 */
+  seed = (unsigned long)s;
+  return seed;
+}
+
+
+/* randomize -- randomize the generator, or initialize to replay */
+
+void randomize(int argc, char **argv)
+{
+  int i, k, n;
+
+  if(argc > 1) {
+    n = sscanf(argv[1], "%d", &k);
+    die((n == 1) ? MPS_RES_OK : MPS_RES_FAIL, "randomize");
+  } else {
+    k = time(NULL) % 32000;
+    printf("Randomizing %d times.\n", k);
+  }
+
+  /* Randomize the random number generator a bit. */
+  for (i = k; i > 0; --i)
+    rnd();
+}
+
+
+/* verror -- die with message */
+
+void verror(const char *format, va_list args)
+{
+  fflush(stdout); /* synchronize */
+  vfprintf(stderr, format, args);
+  fprintf(stderr, "\n");
+  exit(1);
+}
+
+
+/* error -- die with message */
+
+void error(const char *format, ...)
+{
+ va_list args;
+
+ va_start(args, format);
+ verror(format, args);
+ va_end(args);
+}
+
+
+/* die -- Test a return code, and exit on error */
+
+void die(mps_res_t res, const char *s)
+{
+  if (res != MPS_RES_OK) {
+    error("\n%s: %d\n", s, res);
+  }
+}
+
+
+/* die_expect -- Test a return code, and exit on unexpected result */
+
+void die_expect(mps_res_t res, mps_res_t expected, const char *s)
+{
+  if (res != expected) {
+    error("\n%s: %d\n", s, res);
+  }
+}
+
+
+/* cdie -- Test a C boolean, and exit on error */
+
+void cdie(int res, const char *s)
+{
+  if (!res) {
+    error("\n%s: %d\n", s, res);
+  }
+}