1 files changed, 117 insertions, 0 deletions
diff --git a/src/gl/tests/test-limits-h.c b/src/gl/tests/test-limits-h.c
new file mode 100644
index 0000000..4144013
--- /dev/null
+++ b/src/gl/tests/test-limits-h.c
@@ -0,0 +1,117 @@
+/* Test of <limits.h> substitute.
+   Copyright 2016-2021 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert.  */
+
+#include <config.h>
+
+#include <limits.h>
+
+#include "verify.h"
+
+#if 4 < __GNUC__ + (3 <= __GNUC_MINOR__)
+# pragma GCC diagnostic ignored "-Woverlength-strings"
+#endif
+
+#define verify_width(width, min, max) \
+  verify ((max) >> ((width) - 1 - ((min) < 0)) == 1)
+
+/* Macros borrowed from intprops.h.  */
+#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
+#define TYPE_WIDTH(t) (sizeof (t) * CHAR_BIT)
+#define TYPE_MINIMUM(t) ((t) ~ TYPE_MAXIMUM (t))
+#define TYPE_MAXIMUM(t)                                                 \
+  ((t) (! TYPE_SIGNED (t)                                               \
+        ? (t) -1                                                        \
+        : ((((t) 1 << (TYPE_WIDTH (t) - 2)) - 1) * 2 + 1)))
+
+/* Type width macros.  */
+
+int type_bits[] =
+  {
+    CHAR_BIT,
+    WORD_BIT,
+    LONG_BIT
+  };
+verify_width (CHAR_BIT, CHAR_MIN, CHAR_MAX);
+verify_width (WORD_BIT, INT_MIN, INT_MAX);
+verify_width (LONG_BIT, LONG_MIN, LONG_MAX);
+
+/* Numerical limit macros.  */
+
+char               limits1[]  = { CHAR_MIN, CHAR_MAX };
+verify (TYPE_MINIMUM (char) == CHAR_MIN);
+verify (TYPE_MAXIMUM (char) == CHAR_MAX);
+
+signed char        limits2[]  = { SCHAR_MIN, SCHAR_MAX };
+verify (TYPE_MINIMUM (signed char) == SCHAR_MIN);
+verify (TYPE_MAXIMUM (signed char) == SCHAR_MAX);
+
+unsigned char      limits3[]  = { UCHAR_MAX };
+verify (TYPE_MINIMUM (unsigned char) == 0);
+verify (TYPE_MAXIMUM (unsigned char) == UCHAR_MAX);
+
+short              limits4[]  = { SHRT_MIN, SHRT_MAX };
+verify (TYPE_MINIMUM (short int) == SHRT_MIN);
+verify (TYPE_MAXIMUM (short int) == SHRT_MAX);
+
+unsigned short     limits5[]  = { USHRT_MAX };
+verify (TYPE_MINIMUM (unsigned short int) == 0);
+verify (TYPE_MAXIMUM (unsigned short int) == USHRT_MAX);
+
+int                limits6[]  = { INT_MIN, INT_MAX };
+verify (TYPE_MINIMUM (int) == INT_MIN);
+verify (TYPE_MAXIMUM (int) == INT_MAX);
+
+unsigned int       limits7[]  = { UINT_MAX };
+verify (TYPE_MINIMUM (unsigned int) == 0);
+verify (TYPE_MAXIMUM (unsigned int) == UINT_MAX);
+
+long               limits8[]  = { LONG_MIN, LONG_MAX };
+verify (TYPE_MINIMUM (long int) == LONG_MIN);
+verify (TYPE_MAXIMUM (long int) == LONG_MAX);
+
+unsigned long      limits9[]  = { ULONG_MAX };
+verify (TYPE_MINIMUM (unsigned long int) == 0);
+verify (TYPE_MAXIMUM (unsigned long int) == ULONG_MAX);
+
+long long          limits10[] = { LLONG_MIN, LLONG_MAX };
+verify (TYPE_MINIMUM (long long int) == LLONG_MIN);
+verify (TYPE_MAXIMUM (long long int) == LLONG_MAX);
+
+unsigned long long limits11[] = { ULLONG_MAX };
+verify (TYPE_MINIMUM (unsigned long long int) == 0);
+verify (TYPE_MAXIMUM (unsigned long long int) == ULLONG_MAX);
+
+/* Macros specified by ISO/IEC TS 18661-1:2014.  */
+
+verify_width (CHAR_WIDTH, CHAR_MIN, CHAR_MAX);
+verify_width (SCHAR_WIDTH, SCHAR_MIN, SCHAR_MAX);
+verify_width (UCHAR_WIDTH, 0, UCHAR_MAX);
+verify_width (SHRT_WIDTH, SHRT_MIN, SHRT_MAX);
+verify_width (USHRT_WIDTH, 0, USHRT_MAX);
+verify_width (INT_WIDTH, INT_MIN, INT_MAX);
+verify_width (UINT_WIDTH, 0, UINT_MAX);
+verify_width (LONG_WIDTH, LONG_MIN, LONG_MAX);
+verify_width (ULONG_WIDTH, 0, ULONG_MAX);
+verify_width (LLONG_WIDTH, LLONG_MIN, LLONG_MAX);
+verify_width (ULLONG_WIDTH, 0, ULLONG_MAX);
+
+int
+main (void)
+{
+  return 0;
+}