1 files changed, 84 insertions, 0 deletions
diff --git a/src/pdclib/functions/stdio/rename.c b/src/pdclib/functions/stdio/rename.c
new file mode 100644
index 0000000..5d45f1f
--- /dev/null
+++ b/src/pdclib/functions/stdio/rename.c
@@ -0,0 +1,84 @@
+/* rename( const char *, const char * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdio.h>
+
+#ifndef REGTEST
+
+#include "pdclib/_PDCLIB_glue.h"
+
+#include <string.h>
+
+extern struct _PDCLIB_file_t * _PDCLIB_filelist;
+
+int rename( const char * old, const char * new )
+{
+    struct _PDCLIB_file_t * current = _PDCLIB_filelist;
+    while ( current != NULL )
+    {
+        if ( ( current->filename != NULL ) && ( strcmp( current->filename, old ) == 0 ) )
+        {
+            /* File of that name currently open. Do not rename. */
+            return EOF;
+        }
+        current = current->next;
+    }
+    return _PDCLIB_rename( old, new );
+}
+
+#endif
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+#include <stdlib.h>
+
+int main( void )
+{
+    FILE * file;
+    remove( testfile1 );
+    remove( testfile2 );
+    /* make sure that neither file exists */
+    TESTCASE( fopen( testfile1, "r" ) == NULL );
+    TESTCASE( fopen( testfile2, "r" ) == NULL );
+    /* rename file 1 to file 2 - expected to fail */
+    TESTCASE( rename( testfile1, testfile2 ) == -1 );
+    /* create file 1 */
+    TESTCASE( ( file = fopen( testfile1, "w" ) ) != NULL );
+    TESTCASE( fputs( "x", file ) != EOF );
+    TESTCASE( fclose( file ) == 0 );
+    /* check that file 1 exists */
+    TESTCASE( ( file = fopen( testfile1, "r" ) ) != NULL );
+    TESTCASE( fclose( file ) == 0 );
+    /* rename file 1 to file 2 */
+    TESTCASE( rename( testfile1, testfile2 ) == 0 );
+    /* check that file 2 exists, file 1 does not */
+    TESTCASE( fopen( testfile1, "r" ) == NULL );
+    TESTCASE( ( file = fopen( testfile2, "r" ) ) != NULL );
+    TESTCASE( fclose( file ) == 0 );
+    /* create another file 1 */
+    TESTCASE( ( file = fopen( testfile1, "w" ) ) != NULL );
+    TESTCASE( fputs( "x", file ) != EOF );
+    TESTCASE( fclose( file ) == 0 );
+    /* check that file 1 exists */
+    TESTCASE( ( file = fopen( testfile1, "r" ) ) != NULL );
+    TESTCASE( fclose( file ) == 0 );
+    /* rename file 1 to file 2 - expected to fail, see comment in
+       _PDCLIB_rename() itself.
+    */
+    /* NOREG as glibc overwrites existing destination file. */
+    TESTCASE_NOREG( rename( testfile1, testfile2 ) == -1 );
+    /* remove both files */
+    TESTCASE( remove( testfile1 ) == 0 );
+    TESTCASE( remove( testfile2 ) == 0 );
+    /* check that they're gone */
+    TESTCASE( fopen( testfile1, "r" ) == NULL );
+    TESTCASE( fopen( testfile2, "r" ) == NULL );
+    return TEST_RESULTS;
+}
+
+#endif