Initial pass at a port to win32

[pdclib] / platform / win32 / functions / _PDCLIB / _PDCLIB_open.c

diff --git a/platform/win32/functions/_PDCLIB/_PDCLIB_open.c b/platform/win32/functions/_PDCLIB/_PDCLIB_open.c
new file mode 100644 (file)
index 0000000..bfdb897
--- /dev/null
+++ b/platform/win32/functions/_PDCLIB/_PDCLIB_open.c
@@ -0,0 +1,94 @@
+/* $Id$ */
+
+/* _PDCLIB_open( char const * const, int )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+/* This is a stub implementation of open.
+*/
+
+#include <stdio.h>
+#include <errno.h>
+
+#ifndef REGTEST
+#include <_PDCLIB_glue.h>
+#include <windows.h>
+
+void _PDCLIB_w32errno(void);
+HANDLE _PDCLIB_open( char const * const filename, unsigned int mode )
+{
+    DWORD desiredAccess;
+    DWORD creationDisposition;
+
+    switch(mode & ( _PDCLIB_FREAD | _PDCLIB_FWRITE | _PDCLIB_FAPPEND 
+                    | _PDCLIB_FRW ))
+    {
+    case _PDCLIB_FREAD: /* "r" */
+        desiredAccess = GENERIC_READ;
+        creationDisposition = OPEN_EXISTING;
+        break;
+    case _PDCLIB_FWRITE: /* "w" */
+        desiredAccess = GENERIC_WRITE;
+        creationDisposition = CREATE_ALWAYS;
+        break;
+    case _PDCLIB_FAPPEND: /* "a" */
+        desiredAccess = GENERIC_WRITE;
+        creationDisposition = OPEN_ALWAYS;
+        break;
+    case _PDCLIB_FREAD | _PDCLIB_FRW: /* "r+" */
+        desiredAccess = GENERIC_READ | GENERIC_WRITE;
+        creationDisposition = OPEN_EXISTING;
+        break;
+    case _PDCLIB_FWRITE | _PDCLIB_FRW: /* "w+" */
+        desiredAccess = GENERIC_WRITE | GENERIC_READ;
+        creationDisposition = CREATE_ALWAYS;
+        break;
+    case _PDCLIB_FAPPEND | _PDCLIB_FRW: /* "a+" */
+        desiredAccess = GENERIC_WRITE | GENERIC_READ;
+        creationDisposition = OPEN_ALWAYS;
+        break;
+    default: /* Invalid mode */
+        errno = EINVAL;
+        return NULL;
+    }
+
+    HANDLE fd = CreateFileA(filename, desiredAccess, 
+        FILE_SHARE_READ | FILE_SHARE_DELETE,
+        NULL, creationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
+
+    if(fd == INVALID_HANDLE_VALUE) {
+        _PDCLIB_w32errno();
+        return NULL;
+    }
+
+    if(mode & _PDCLIB_FAPPEND) {
+        LARGE_INTEGER offs;
+        offs.QuadPart = 0;
+        BOOL ok = SetFilePointerEx(fd, offs, NULL, FILE_END);
+        if(!ok) {
+            _PDCLIB_w32errno();
+            CloseHandle(fd);
+            return NULL;
+        }
+    }
+
+    return fd;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+int main( void )
+{
+    return TEST_RESULTS;
+}
+
+#endif
+