test: Added test-wchar

Added testcase that checks input/output wide-chars to/from a file.
issue found by running SuperTest by Solid Sands

Signed-off-by: Ahmed Shehab <[email protected]>

test/meson.build

@@ -544,6 +544,7 @@ foreach target : targets
                       'test-ungetc-ftell',
                       'test-fgetc',
                       'test-fgets-eof',
+                      'test-wchar',
                      ]
     endif
   endif
@@ -643,6 +644,12 @@ if enable_native_tests
 		    c_args: native_c_args,
 		    link_args: native_c_args,
 		    dependencies: native_lib_m))
+    test('test-wchar',
+    executable('test-wchar',
+        'test-wchar.c',
+        c_args: native_c_args,
+        link_args: native_c_args,
+        dependencies: native_lib_m))
 
     test('fenv-native',
          executable('fenv-native',

test/test-wchar.c

@@ -0,0 +1,77 @@
+/*
+* SPDX-License-Identifier: BSD-3-Clause
+* 
+* Copyright © 2024, Synopsys Inc.
+* Copyright © 2024, Solid Sands B.V.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions
+* are met:
+*
+* 1. Redistributions of source code must retain the above copyright
+*    notice, this list of conditions and the following disclaimer.
+*
+* 2. Redistributions in binary form must reproduce the above
+*    copyright notice, this list of conditions and the following
+*    disclaimer in the documentation and/or other materials provided
+*    with the distribution.
+*
+* 3. Neither the name of the copyright holder nor the names of its
+*    contributors may be used to endorse or promote products derived
+*    from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+* OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <stdio.h>
+#include <wchar.h>
+
+
+const wchar_t *string = L"Hello\n";
+
+int main (void)
+{
+    FILE *file;
+    const wchar_t *ref;
+	wint_t res;
+
+    /* Create testfile.dat in write mode */
+    file = fopen("testfile.dat", "w");
+    if (file == NULL) return 1;
+
+    /* Write wide characters to the file */
+    fputws(string, file);
+	fclose(file);
+
+    /* Open testfile.dat in read mode */
+    file = fopen("testfile.dat", "r");
+
+	for (ref = string; *ref != L'\0'; ref++) {
+
+        /* Read wide-char by wide-char from the file */
+		res = fgetwc(file);
+        if((wchar_t) res != *ref) {
+            printf("Test Failed: Failed to read wide character from file\n");
+            return 1;
+        }
+	}
+
+    if(fgetwc(file) != WEOF) {
+        printf("Test Failed: Failed to check if end-of-file reached\n");
+        return 1;    
+    }
+
+    printf("Test Passed: Wide characters were written & read successfuly\n");
+    return 0;
+}