1 files changed, 91 insertions, 0 deletions
diff --git a/gnulib-tests/test-btowc.c b/gnulib-tests/test-btowc.c
new file mode 100644
index 0000000..908ec6a
--- /dev/null
+++ b/gnulib-tests/test-btowc.c
@@ -0,0 +1,91 @@
+/* Test of conversion of unibyte character to wide character.
+   Copyright (C) 2008-2023 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 Bruno Haible <bruno@clisp.org>, 2008.  */
+
+#include <config.h>
+
+#include <wchar.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (btowc, wint_t, (int));
+
+#include <locale.h>
+#include <stdio.h>
+
+#include "macros.h"
+
+int
+main (int argc, char *argv[])
+{
+  int c;
+
+  /* configure should already have checked that the locale is supported.  */
+  if (setlocale (LC_ALL, "") == NULL)
+    return 1;
+
+  ASSERT (btowc (EOF) == WEOF);
+
+#ifdef __ANDROID__
+  /* On Android ≥ 5.0, the default locale is the "C.UTF-8" locale, not the
+     "C" locale.  Furthermore, when you attempt to set the "C" or "POSIX"
+     locale via setlocale(), what you get is a "C" locale with UTF-8 encoding,
+     that is, effectively the "C.UTF-8" locale.  */
+  if (argc > 1 && strcmp (argv[1], "1") == 0 && MB_CUR_MAX > 1)
+    argv[1] = "3";
+#endif
+
+  if (argc > 1)
+    switch (argv[1][0])
+      {
+      case '1':
+        /* C or POSIX locale.  */
+        for (c = 0; c < 0x100; c++)
+          if (c != 0)
+            {
+              /* We are testing all nonnull bytes.  */
+              wint_t wc = btowc (c);
+              /* POSIX:2018 says: "In the POSIX locale, btowc() shall not return
+                 WEOF if c has a value in the range 0 to 255 inclusive."  */
+              if (c < 0x80)
+                /* c is an ASCII character.  */
+                ASSERT (wc == c);
+              else
+                /* On most platforms, the bytes 0x80..0xFF map to U+0080..U+00FF.
+                   But on musl libc, the bytes 0x80..0xFF map to U+DF80..U+DFFF.  */
+                ASSERT (wc == c || wc == 0xDF00 + c);
+            }
+        return 0;
+
+      case '2':
+        /* Locale encoding is ISO-8859-1 or ISO-8859-15.  */
+        for (c = 0; c < 0x80; c++)
+          ASSERT (btowc (c) == c);
+        for (c = 0xA0; c < 0x100; c++)
+          ASSERT (btowc (c) != WEOF);
+        return 0;
+
+      case '3':
+        /* Locale encoding is UTF-8.  */
+        for (c = 0; c < 0x80; c++)
+          ASSERT (btowc (c) == c);
+        for (c = 0x80; c < 0x100; c++)
+          ASSERT (btowc (c) == WEOF);
+        return 0;
+      }
+
+  return 1;
+}