-/* ----------------------------------------------------------------------------
- * $Id$
- * ----------------------------------------------------------------------------
- * 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)
-{
- char *mybuf;
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
- if (mode == _IONBF)
- {
- stream->bufTech = mode;
- return (0);
- }
- if (buf == NULL)
- {
- if (size < 2)
- {
- return (-1);
- }
- mybuf = malloc(size + 8);
- if (mybuf == NULL)
- {
- return (-1);
- }
- }
- else
- {
- if (size < 10)
- {
- return (-1);
- }
- 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))
+#ifndef REGTEST
+
+int setvbuf( struct _PDCLIB_file_t * _PDCLIB_restrict stream, char * _PDCLIB_restrict buf, int mode, size_t size )
+{
+ switch ( mode )
{
- stream->quickBin = 0;
+ case _IONBF:
+ /* When unbuffered I/O is requested, we keep the buffer anyway, as
+ we don't want to e.g. flush the stream for every character of a
+ stream being printed.
+ */
+ break;
+ case _IOFBF:
+ case _IOLBF:
+ if ( size > INT_MAX || size == 0 )
+ {
+ /* PDCLib only supports buffers up to INT_MAX in size. A size
+ of zero doesn't make sense.
+ */
+ return -1;
+ }
+ if ( buf == NULL )
+ {
+ /* User requested buffer size, but leaves it to library to
+ allocate the buffer.
+ */
+ /* If current buffer is big enough for requested size, but not
+ over twice as big (and wasting memory space), we use the
+ current buffer (i.e., do nothing), to save the malloc() /
+ free() overhead.
+ */
+ if ( ( stream->bufsize < size ) || ( stream->bufsize > ( size << 1 ) ) )
+ {
+ /* Buffer too small, or much too large - allocate. */
+ if ( ( buf = (char *) malloc( size ) ) == NULL )
+ {
+ /* Out of memory error. */
+ return -1;
+ }
+ /* This buffer must be free()d on fclose() */
+ stream->status |= _PDCLIB_FREEBUFFER;
+ }
+ }
+ stream->buffer = buf;
+ stream->bufsize = size;
+ break;
+ default:
+ /* If mode is something else than _IOFBF, _IOLBF or _IONBF -> exit */
+ return -1;
}
- return (0);
+ /* Deleting current buffer mode */
+ stream->status &= ~( _IOFBF | _IOLBF | _IONBF );
+ /* Set user-defined mode */
+ stream->status |= mode;
+ return 0;
}
-*/
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+#include <errno.h>
+
+#define BUFFERSIZE 500
+
+int main( void )
+{
+#ifndef REGTEST
+ char buffer[ BUFFERSIZE ];
+ FILE * fh;
+ /* full buffered, user-supplied buffer */
+ TESTCASE( ( fh = tmpfile() ) != NULL );
+ TESTCASE( setvbuf( fh, buffer, _IOFBF, BUFFERSIZE ) == 0 );
+ TESTCASE( fh->buffer == buffer );
+ TESTCASE( fh->bufsize == BUFFERSIZE );
+ TESTCASE( ( fh->status & ( _IOFBF | _IONBF | _IOLBF ) ) == _IOFBF );
+ TESTCASE( fclose( fh ) == 0 );
+ /* line buffered, lib-supplied buffer */
+ TESTCASE( ( fh = tmpfile() ) != NULL );
+ TESTCASE( setvbuf( fh, NULL, _IOLBF, BUFFERSIZE ) == 0 );
+ TESTCASE( fh->buffer != NULL );
+ TESTCASE( fh->bufsize == BUFFERSIZE );
+ TESTCASE( ( fh->status & ( _IOFBF | _IONBF | _IOLBF ) ) == _IOLBF );
+ TESTCASE( fclose( fh ) == 0 );
+ /* not buffered, user-supplied buffer */
+ TESTCASE( ( fh = tmpfile() ) != NULL );
+ TESTCASE( setvbuf( fh, buffer, _IONBF, BUFFERSIZE ) == 0 );
+ 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
+