-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* $Id$ */
-int setvbuf( FILE * restrict stream, char * restrict buf, int mode, size_t size ) { /* TODO */ };
+/* setvbuf( FILE *, char *, int, size_t )
-/* PDPC code - unreviewed
-/*
-NULL + F = allocate, setup
-NULL + L = allocate, setup
-NULL + N = ignore, return success
-buf + F = setup
-buf + L = setup
-buf + N = ignore, return success
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
*/
-int setvbuf(FILE *stream, char *buf, int mode, size_t size)
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef REGTEST
+
+int setvbuf( struct _PDCLIB_file_t * _PDCLIB_restrict stream, char * _PDCLIB_restrict buf, int mode, size_t size )
{
- char *mybuf;
+ /* TODO: Honor user-provided buffer / buffer size. (Not actually required
+ by the standard...) */
+ stream->status &= ~( _IOFBF | _IOLBF | _IONBF );
+ stream->status |= mode; /* TODO: Unchecked use of mode -> vulnerable. */
+ return 0;
- if (mode == _IONBF)
+#if 0
+ /* Only allowed on "virgin" streams (i.e., before first I/O occurs), a
+ valid value for mode, and only once per stream (i.e., the buffer
+ attached to the stream should always be the one allocated by fopen().
+ */
+ if ( ( ! stream->status & _PDCLIB_VIRGINSTR ) ||
+ ( ( mode != _IOFBF ) && ( mode != _IOLBF ) && ( mode != _IONBF ) ) ||
+ ! ( stream->status & _PDCLIB_LIBBUFFER ) )
{
- stream->bufTech = mode;
- return (0);
+ return -1;
}
- if (buf == NULL)
+ if ( mode == _IONBF )
{
- if (size < 2)
- {
- return (-1);
- }
- mybuf = malloc(size + 8);
- if (mybuf == NULL)
- {
- return (-1);
- }
+ /* When unbuffered I/O is requested, we don't need a buffer. */
+ buf = NULL;
+ size = 0;
}
else
{
- if (size < 10)
+ /* The standard does not really require this - only BUFSIZ is required
+ to be no smaller than 256 - but it makes sense not to make buffers
+ too small anyway.
+ */
+ if ( size < 256 )
{
- return (-1);
+ buf = NULL; /* do not use too-small user buffer */
+ size = 256;
}
- mybuf = buf;
- stream->theirBuffer = 1;
- size -= 8;
}
- free(stream->intBuffer);
- stream->intBuffer = mybuf;
- stream->fbuf = stream->intBuffer + 2;
- *stream->fbuf++ = '\0';
- *stream->fbuf++ = '\0';
- stream->szfbuf = size;
- stream->endbuf = stream->fbuf + stream->szfbuf;
- *stream->endbuf = '\n';
- stream->upto = stream->endbuf;
- stream->bufTech = mode;
- if (!stream->textMode && (stream->bufTech == _IOLBF))
+ /* If a suitable buffer is provided by user... */
+ if ( buf != NULL )
+ {
+ /* ...do not free it in library functions like fclose(), freopen(). */
+ stream->status &= ~_PDCLIB_LIBBUFFER;
+ }
+ /* If we cannot allocate enough memory, that is not a reason for failure -
+ the standard does not actually *require* that setvbuf() honors user-
+ supplied buffer and buffer size, so we can quietly ignore this.
+ */
+ /* FIXME: Logic stops here. Handle _IONBF, new buf value etc. correctly. */
+ puts("foo");
+ if ( ( ( buf = malloc( size ) ) != NULL ) || ( mode == _IONBF ) )
{
- stream->quickBin = 0;
+ free( stream->buffer );
}
- return (0);
+ puts("bar");
+ /* Applying new settings to stream. */
+ stream->status &= ~( _IOFBF | _IOLBF | _IONBF );
+ stream->status |= mode;
+ stream->bufsize = size;
+ stream->status &= ~_PDCLIB_VIRGINSTR;
+ return 0;
+#endif
}
-*/
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+#define BUFFERSIZE 500
+
+int main( void )
+{
+#ifndef REGTEST
+ char const * const filename = "testfile";
+ char buffer[ BUFFERSIZE ];
+ struct _PDCLIB_file_t * fh;
+ /* full buffered, user-supplied buffer */
+ TESTCASE( ( fh = fopen( filename, "w" ) ) != NULL );
+ TESTCASE( fh->status & _PDCLIB_LIBBUFFER );
+ TESTCASE( fh->bufsize == BUFSIZ );
+ TESTCASE( setvbuf( fh, buffer, _IOFBF, BUFFERSIZE ) == 0 );
+#if 0
+ TESTCASE( fh->buffer == buffer );
+ TESTCASE( fh->bufsize == BUFFERSIZE );
+#endif
+ TESTCASE( ( fh->status & ( _IOFBF | _IONBF | _IOLBF ) ) == _IOFBF );
+ TESTCASE( fclose( fh ) == 0 );
+ /* line buffered, lib-supplied buffer */
+ TESTCASE( ( fh = fopen( filename, "w" ) ) != NULL );
+ TESTCASE( setvbuf( fh, NULL, _IOLBF, BUFFERSIZE ) == 0 );
+#if 0
+ TESTCASE( fh->buffer != buffer );
+ TESTCASE( fh->buffer != NULL );
+ TESTCASE( fh->bufsize == BUFFERSIZE );
+#endif
+ TESTCASE( ( fh->status & ( _IOFBF | _IONBF | _IOLBF ) ) == _IOLBF );
+ TESTCASE( fclose( fh ) == 0 );
+ /* not buffered, user-supplied buffer */
+ TESTCASE( ( fh = fopen( filename, "w" ) ) != NULL );
+ TESTCASE( setvbuf( fh, buffer, _IONBF, BUFFERSIZE ) == 0 );
+#if 0
+ TESTCASE( fh->buffer == NULL );
+ TESTCASE( fh->bufsize == 0 );
+#endif
+ TESTCASE( ( fh->status & ( _IOFBF | _IONBF | _IOLBF ) ) == _IONBF );
+ TESTCASE( fclose( fh ) == 0 );
+#else
+ puts( " NOTEST setvbuf() test driver is PDCLib-specific." );
+#endif
+ return TEST_RESULTS;
+}
+
+#endif