* platform/example is now a "stub" platform - it should compile anywhere, but

[pdclib.old] / platform / posix / functions / _PDCLIB / rename.c

diff --git a/platform/posix/functions/_PDCLIB/rename.c b/platform/posix/functions/_PDCLIB/rename.c
new file mode 100644 (file)
index 0000000..a37eeb3
--- /dev/null
+++ b/platform/posix/functions/_PDCLIB/rename.c
@@ -0,0 +1,139 @@
+/* $Id$ */
+
+/* _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