Intermediate stdio work.

[pdclib] / functions / stdio / fopen.c

diff --git a/functions/stdio/fopen.c b/functions/stdio/fopen.c
index 04020d94645a1f52dee6f3bd88da52c0e91f4850..d181cc1f876ded1362cc297e8c2fad923e67ae64 100644 (file)
--- a/functions/stdio/fopen.c
+++ b/functions/stdio/fopen.c
@@ -1,8 +1,82 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-FILE * fopen( const char * restrict filename, const char * restrict mode ) { /* TODO */ };
+/* $Id$ */
+
+/* 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>
+
+/* FIXME: This approach is a possible attack vector. */
+struct _PDCLIB_file_t * _PDCLIB_filelist = NULL;
+
+struct _PDCLIB_file_t * fopen( const char * _PDCLIB_restrict filename, const char * _PDCLIB_restrict mode )
+{
+    struct _PDCLIB_file_t * rc;
+    if ( mode == NULL || filename == NULL || filename[0] == '\0' )
+    {
+        /* Mode or filename invalid */
+        return NULL;
+    }
+    if ( ( rc = calloc( 1, sizeof( struct _PDCLIB_file_t ) ) ) == NULL )
+    {
+        /* no memory for another FILE */
+        return NULL;
+    }
+    if ( ( rc->status = _PDCLIB_filemode( mode ) ) == 0 ) goto fail; /* invalid mode */
+    rc->handle = _PDCLIB_open( filename, rc->status );
+    if ( rc->handle == _PDCLIB_NOHANDLE ) goto fail; /* OS open() failed */
+    /* Adding to list of open files */
+    rc->next = _PDCLIB_filelist;
+    _PDCLIB_filelist = rc;
+    /* Setting buffer, and mark as internal. TODO: Check for unbuffered */
+    if ( ( rc->buffer = malloc( BUFSIZ ) ) == NULL ) goto fail;
+    rc->bufsize = BUFSIZ;
+    rc->bufidx = 0;
+    /* Setting buffer to _IOLBF because "when opened, a stream is fully
+       buffered if and only if it can be determined not to refer to an
+       interactive device."
+    */
+    rc->status |= ( _PDCLIB_LIBBUFFER | _PDCLIB_VIRGINSTR /* | _IOLBF */ ); /* FIXME: Uncommenting the _IOLBF here breaks output. */
+    /* TODO: Setting mbstate */
+    return rc;
+fail:
+    free( rc );
+    return NULL;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    /* Some of the tests are not executed for regression tests, as the libc on
+       my system is at once less forgiving (segfaults on mode NULL) and more
+       forgiving (accepts undefined modes).
+    */
+#ifndef REGTEST
+    TESTCASE( fopen( NULL, NULL ) == NULL );
+#endif
+    TESTCASE( fopen( NULL, "w" ) == NULL );
+#ifndef REGTEST
+    TESTCASE( fopen( "", NULL ) == NULL );
+#endif
+    TESTCASE( fopen( "", "w" ) == NULL );
+    TESTCASE( fopen( "foo", "" ) == NULL );
+#ifndef REGTEST
+    TESTCASE( fopen( "testfile", "wq" ) == NULL ); /* Undefined mode */
+    TESTCASE( fopen( "testfile", "wr" ) == NULL ); /* Undefined mode */
+#endif
+    TESTCASE( fopen( "testfile", "w" ) != NULL );
+    system( "rm testfile" );
+    return TEST_RESULTS;
+}
+
+#endif