Porting current working set from CVS.

[fw/pdclib] / functions / stdio / fopen.c

diff --git a/functions/stdio/fopen.c b/functions/stdio/fopen.c
new file mode 100644 (file)
index 0000000..4d249ef
--- /dev/null
+++ b/functions/stdio/fopen.c
@@ -0,0 +1,87 @@
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* fopen( 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>
+#include <stdlib.h>
+
+#ifndef REGTEST
+#include <_PDCLIB_glue.h>
+
+static const FILE * _PDCLIB_filelist = NULL;
+
+static int filemode( char const * const mode )
+{
+    int rc = 0;
+    switch ( mode[0] )
+    {
+        case 'r':
+            rc |= _PDCLIB_FREAD;
+            break;
+        case 'w':
+            rc |= _PDCLIB_FWRITE;
+            break;
+        case 'a':
+            rc |= _PDCLIB_FAPPEND;
+            break;
+        default:
+            return -1;
+    }
+    for ( size_t i = 1; i < 4; ++i )
+    {
+        switch ( mode[1] )
+        {
+            case '+':
+                if ( rc & _PDCLIB_FRW ) return -1;
+                rc |= _PDCLIB_FRW;
+                break;
+            case 'b':
+                if ( rc & _PDCLIB_FBIN ) return -1;
+                rc |= _PDCLIB_FBIN;
+                break;
+            case '\0':
+                return rc;
+            default:
+                return -1;
+        }
+    }
+    return -1;
+}
+
+FILE * fopen( const char * _PDCLIB_restrict filename, const char * _PDCLIB_restrict mode )
+{
+    FILE * rc;
+    if ( mode == NULL || filename == NULL || filename[0] == '\0' )
+    {
+        return NULL;
+    }
+    if ( ( rc = calloc( 1, sizeof( FILE ) ) ) == NULL ) return rc; /* no space for another FILE */
+    if ( ( rc->status = filemode( mode ) ) == -1 ) goto fail; /* invalid mode given */
+    if ( ( rc->handle = _PDCLIB_open( filename, rc->status ) ) == -1 ) goto fail; /* OS "open" failed */
+    rc->next = _PDCLIB_filelist;
+    _PDCLIB_filelist = rc;
+    /* TODO: Continue here: Set up PDCLib FILE contents */
+    return rc;
+fail:
+    free( rc );
+    return NULL;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    TESTCASE( NO_TESTDRIVER );
+    return TEST_RESULTS;
+}
+
+#endif