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

[pdclib] / platform / posix / functions / _PDCLIB / fillbuffer.c

diff --git a/platform/posix/functions/_PDCLIB/fillbuffer.c b/platform/posix/functions/_PDCLIB/fillbuffer.c
new file mode 100644 (file)
index 0000000..1d45025
--- /dev/null
+++ b/platform/posix/functions/_PDCLIB/fillbuffer.c
@@ -0,0 +1,79 @@
+/* $Id$ */
+
+/* _PDCLIB_fillbuffer( struct _PDCLIB_file_t * stream )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+/* This is an example implementation of _PDCLIB_fillbuffer() fit for
+   use with POSIX kernels.
+*/
+
+#include <stdio.h>
+
+#ifndef REGTEST
+#include <_PDCLIB_glue.h>
+
+#include </usr/include/errno.h>
+
+typedef long ssize_t;
+extern ssize_t read( int fd, void * buf, size_t count );
+
+int _PDCLIB_fillbuffer( struct _PDCLIB_file_t * stream )
+{
+    /* No need to handle buffers > INT_MAX, as PDCLib doesn't allow them */
+    ssize_t rc = read( stream->handle, stream->buffer, stream->bufsize );
+    if ( rc > 0 )
+    {
+        /* Reading successful. */
+        if ( ! ( stream->status & _PDCLIB_FBIN ) )
+        {
+            /* TODO: Text stream conversion here */
+        }
+        stream->pos.offset += rc;
+        stream->bufend = rc;
+        stream->bufidx = 0;
+        return 0;
+    }
+    if ( rc < 0 )
+    {
+        /* Reading error */
+        switch ( errno )
+        {
+            /* See comments on implementation-defined errno values in
+               <_PDCLIB_config.h>.
+            */
+            case EBADF:
+            case EFAULT:
+            case EINTR:
+            case EINVAL:
+            case EIO:
+                _PDCLIB_errno = _PDCLIB_ERROR;
+                break;
+            default:
+                /* This should be something like EUNKNOWN. */
+                _PDCLIB_errno = _PDCLIB_ERROR;
+                break;
+        }
+        stream->status |= _PDCLIB_ERRORFLAG;
+        return EOF;
+    }
+    /* End-of-File */
+    stream->status |= _PDCLIB_EOFFLAG;
+    return EOF;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    /* Testing covered by ftell.c */
+    return TEST_RESULTS;
+}
+
+#endif
+