+/* $Id$ */
+
+/* _PDCLIB_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_glue.h>
+
+#include </usr/include/errno.h>
+
+extern int unlink( const char * pathname );
+extern int link( const char * old, const char * new );
+
+int _PDCLIB_rename( const char * old, const char * new )
+{
+ /* Note that the behaviour if new file exists is implementation-defined.
+ There is nothing wrong with either overwriting it or failing the
+ operation, but you might want to document whichever you chose.
+ This example fails if new file exists.
+ */
+ if ( link( old, new ) == 0 )
+ {
+ if ( unlink( old ) == EOF )
+ {
+ switch ( errno )
+ {
+ /* See the comments on implementation-defined errno values in
+ <_PDCLIB_config.h>.
+ */
+ case EACCES:
+ case EFAULT:
+ case EIO:
+ case EISDIR:
+ case ELOOP:
+ case ENAMETOOLONG:
+ case ENOENT:
+ case ENOMEM:
+ case ENOTDIR:
+ case EPERM:
+ case EROFS:
+ _PDCLIB_errno = _PDCLIB_ERROR;
+ break;
+ default:
+ /* This should be something like EUNKNOWN. */
+ _PDCLIB_errno = _PDCLIB_ERROR;
+ break;
+ }
+ return -1;
+ }
+ else
+ {
+ return 0;
+ }
+ }
+ else
+ {
+ switch ( errno )
+ {
+ /* See the comments on implementation-defined errno values in
+ <_PDCLIB_config.h>.
+ */
+ case EACCES:
+ case EEXIST:
+ case EFAULT:
+ case EIO:
+ case ELOOP:
+ case EMLINK:
+ case ENAMETOOLONG:
+ case ENOENT:
+ case ENOMEM:
+ case ENOSPC:
+ case ENOTDIR:
+ case EPERM:
+ case EROFS:
+ case EXDEV:
+ _PDCLIB_errno = _PDCLIB_ERROR;
+ break;
+ default:
+ /* This should be something like EUNKNOWN. */
+ _PDCLIB_errno = _PDCLIB_ERROR;
+ break;
+ }
+ return EOF;
+ }
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+#include <stdlib.h>
+
+int main( void )
+{
+ FILE * file;
+ remove( testfile1 );
+ remove( testfile2 );
+ /* check that neither file exists */
+ TESTCASE( fopen( testfile1, "r" ) == NULL );
+ TESTCASE( fopen( testfile2, "r" ) == NULL );
+ /* rename file 1 to file 2 - expected to fail */
+ TESTCASE( _PDCLIB_rename( testfile1, testfile2 ) == -1 );
+ /* create file 1 */
+ TESTCASE( ( file = fopen( testfile1, "w" ) ) != NULL );
+ TESTCASE( fputc( 'x', file ) == 'x' );
+ 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( _PDCLIB_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( fputc( 'x', file ) == 'x' );
+ 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.
+ */
+ TESTCASE( _PDCLIB_rename( testfile1, testfile2 ) == -1 );
+ /* remove both files */
+ remove( testfile1 );
+ remove( testfile2 );
+ return TEST_RESULTS;
+}
+
+#endif