Add tests for the long double version of ecvt and fcvt

The test case misc/tst-efgcvt.c only tests the double variants of the
Old-fashioned System V number-to-string functions: ecvt, fcvt, and their
re-entrant counterparts.  With a few macros, the code can be reused for
the long double versions of these functions.  A future patch will reuse
it again for IEEE long double on powerpc64le.

Tested for powerpc and powerpc64le.

1 files changed, 235 insertions, 0 deletions

diff --git a/misc/tst-efgcvt-template.c b/misc/tst-efgcvt-template.c
new file mode 100644
index 0000000000..cba964a842
--- /dev/null
+++ b/misc/tst-efgcvt-template.c
@@ -0,0 +1,235 @@
+/* Copyright (C) 1998-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This template provides testing for the *cvt family of functions,
+   which deal with double or long double types.  In order to use the
+   template, the following macros must be defined before inclusion of
+   this template:
+
+     FLOAT: The floating-point type, i.e. double or long double.
+
+     ECVT: Appropriate *ecvt function for FLOAT, i.e. ecvt or qecvt.
+     FCVT: Likewise for *fcvt, i.e. fcvt or qfcvt.
+     ECVT_R: Likewise for *ecvt_r, i.e. ecvt_r or qecvt_r.
+     FCVT_R: Likewise for *fcvt_r, i.e. fcvt_r or qfcvt_r.
+
+     PRINTF_CONVERSION: The appropriate printf conversion specifier with
+     length modifier for FLOAT, i.e. "%f" or "%Lf".
+
+     EXTRA_ECVT_TESTS: Additional tests for the ecvt or qecvt function
+     that are only relevant to a particular floating-point type and
+     cannot be represented generically.  */
+
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE	1
+#endif
+
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <support/check.h>
+
+#define NAME(x) NAMEX(x)
+#define NAMEX(x) #x
+
+typedef struct
+{
+  FLOAT value;
+  int ndigit;
+  int decpt;
+  char result[30];
+} testcase;
+
+typedef char * ((*efcvt_func) (FLOAT, int, int *, int *));
+
+typedef int ((*efcvt_r_func) (FLOAT, int, int *, int *, char *, size_t));
+
+
+static testcase ecvt_tests[] =
+{
+  { 0.0, 0, 1, "" },
+  { 10.0, 0, 2, "" },
+  { 10.0, 1, 2, "1" },
+  { 10.0, 5, 2, "10000" },
+  { -12.0, 5, 2, "12000" },
+  { 0.2, 4, 0, "2000" },
+  { 0.02, 4, -1, "2000" },
+  { 5.5, 1, 1, "6" },
+  { 1.0, -1, 1, "" },
+  { 0.01, 2, -1, "10" },
+  { 100.0, -2, 3, "" },
+  { 100.0, -5, 3, "" },
+  { 100.0, -4, 3, "" },
+  { 100.01, -4, 3, "" },
+  { 123.01, -4, 3, "" },
+  { 126.71, -4, 3, "" },
+  { 0.0, 4, 1, "0000" },
+  EXTRA_ECVT_TESTS
+  /* -1.0 is end marker.  */
+  { -1.0, 0, 0, "" }
+};
+
+static testcase fcvt_tests[] =
+{
+  { 0.0, 0, 1, "0" },
+  { 10.0, 0, 2, "10" },
+  { 10.0, 1, 2, "100" },
+  { 10.0, 4, 2, "100000" },
+  { -12.0, 5, 2, "1200000" },
+  { 0.2, 4, 0, "2000" },
+  { 0.02, 4, -1, "200" },
+  { 5.5, 1, 1, "55" },
+  { 5.5, 0, 1, "6" },
+  { 0.01, 2, -1, "1" },
+  { 100.0, -2, 3, "100" },
+  { 100.0, -5, 3, "100" },
+  { 100.0, -4, 3, "100" },
+  { 100.01, -4, 3, "100" },
+  { 123.01, -4, 3, "100" },
+  { 126.71, -4, 3, "100" },
+  { 322.5, 16, 3, "3225000000000000000" },
+  /* -1.0 is end marker.  */
+  { -1.0, 0, 0, "" }
+};
+
+static void
+output_error (const char *name, FLOAT value, int ndigit,
+	      const char *exp_p, int exp_decpt, int exp_sign,
+	      char *res_p, int res_decpt, int res_sign)
+{
+  printf ("%s returned wrong result for value: " PRINTF_CONVERSION
+	  ", ndigits: %d\n",
+	  name, value, ndigit);
+  printf ("Result was p: \"%s\", decpt: %d, sign: %d\n",
+	  res_p, res_decpt, res_sign);
+  printf ("Should be  p: \"%s\", decpt: %d, sign: %d\n",
+	  exp_p, exp_decpt, exp_sign);
+  support_record_failure ();
+}
+
+
+static void
+output_r_error (const char *name, FLOAT value, int ndigit,
+		const char *exp_p, int exp_decpt, int exp_sign, int exp_return,
+		char *res_p, int res_decpt, int res_sign, int res_return)
+{
+  printf ("%s returned wrong result for value: " PRINTF_CONVERSION
+	  ", ndigits: %d\n",
+	  name, value, ndigit);
+  printf ("Result was buf: \"%s\", decpt: %d, sign: %d return value: %d\n",
+	  res_p, res_decpt, res_sign, res_return);
+  printf ("Should be  buf: \"%s\", decpt: %d, sign: %d\n",
+	  exp_p, exp_decpt, exp_sign);
+  support_record_failure ();
+}
+
+static void
+test (testcase tests[], efcvt_func efcvt, const char *name)
+{
+  int no = 0;
+  int decpt, sign;
+  char *p;
+
+  while (tests[no].value != -1.0)
+    {
+      p = efcvt (tests[no].value, tests[no].ndigit, &decpt, &sign);
+      if (decpt != tests[no].decpt
+	  || sign != (tests[no].value < 0)
+	  || strcmp (p, tests[no].result) != 0)
+	output_error (name, tests[no].value, tests[no].ndigit,
+		      tests[no].result, tests[no].decpt,
+		      (tests[no].value < 0),
+		      p, decpt, sign);
+      ++no;
+    }
+}
+
+static void
+test_r (testcase tests[], efcvt_r_func efcvt_r, const char *name)
+{
+  int no = 0;
+  int decpt, sign, res;
+  char buf [1024];
+
+
+  while (tests[no].value != -1.0)
+    {
+      res = efcvt_r (tests[no].value, tests[no].ndigit, &decpt, &sign,
+		     buf, sizeof (buf));
+      if (res != 0
+	  || decpt != tests[no].decpt
+	  || sign != (tests[no].value < 0)
+	  || strcmp (buf, tests[no].result) != 0)
+	output_r_error (name, tests[no].value, tests[no].ndigit,
+			tests[no].result, tests[no].decpt, 0,
+			(tests[no].value < 0),
+			buf, decpt, sign, res);
+      ++no;
+    }
+}
+
+static void
+special (void)
+{
+  int decpt, sign, res;
+  char *p;
+  char buf [1024];
+
+  p = ECVT (NAN, 10, &decpt, &sign);
+  if (sign != 0 || strcmp (p, "nan") != 0)
+    output_error (NAME (ECVT), NAN, 10, "nan", 0, 0, p, decpt, sign);
+
+  p = ECVT (INFINITY, 10, &decpt, &sign);
+  if (sign != 0 || strcmp (p, "inf") != 0)
+    output_error (NAME (ECVT), INFINITY, 10, "inf", 0, 0, p, decpt, sign);
+
+  /* Simply make sure these calls with large NDIGITs don't crash.  */
+  (void) ECVT (123.456, 10000, &decpt, &sign);
+  (void) FCVT (123.456, 10000, &decpt, &sign);
+
+  /* Some tests for the reentrant functions.  */
+  /* Use a too small buffer.  */
+  res = ECVT_R (123.456, 10, &decpt, &sign, buf, 1);
+  if (res == 0)
+    {
+      printf (NAME (ECVT_R) " with a too small buffer was succesful.\n");
+      support_record_failure ();
+    }
+  res = FCVT_R (123.456, 10, &decpt, &sign, buf, 1);
+  if (res == 0)
+    {
+      printf (NAME (FCVT_R) " with a too small buffer was succesful.\n");
+      support_record_failure ();
+    }
+}
+
+
+static int
+do_test (void)
+{
+  test (ecvt_tests, ECVT, NAME (ECVT));
+  test (fcvt_tests, FCVT, NAME (FCVT));
+  test_r (ecvt_tests, ECVT_R, NAME (ECVT_R));
+  test_r (fcvt_tests, FCVT_R, NAME (FCVT_R));
+  special ();
+
+  return 0;
+}
+
+#include <support/test-driver.c>