-/* ----------------------------------------------------------------------------
- * $Id$
- * ----------------------------------------------------------------------------
- * 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>
+
+#ifndef REGTEST
- if (mode == _IONBF)
+int setvbuf( struct _PDCLIB_file_t * _PDCLIB_restrict stream, char * _PDCLIB_restrict buf, int mode, size_t size )
+{
+ /* Only allowed on "virgin" streams (i.e., before first I/O occurs), and
+ a valid value for mode.
+ */
+ if ( ( ! stream->status & _PDCLIB_VIRGINSTR ) ||
+ ( ( mode != _IOFBF ) && ( mode != _IOLBF ) && ( mode != _IONBF ) ) )
{
- stream->bufTech = mode;
- return (0);
+ return -1;
}
- if (buf == NULL)
+ /* If a buffer is provided by user... */
+ if ( buf != NULL )
{
- if (size < 2)
- {
- return (-1);
- }
- mybuf = malloc(size + 8);
- if (mybuf == NULL)
- {
- return (-1);
- }
+ /* ...do not free it in library functions like fclose(), freopen(). */
+ stream->status &= ~_PDCLIB_LIBBUFFER;
}
- else
+ /* If no buffer is provided by user, but required... */
+ else if ( mode != _IONBF )
{
- if (size < 10)
+ /* Since setvbuf() may be called (successfully) on a stream only once,
+ the stream's buffer at this point should *always* be that allocated
+ by fopen(), but better make sure.
+ */
+ if ( ! ( stream->status & _PDCLIB_LIBBUFFER ) )
{
- return (-1);
+ return -1;
+ }
+ /* Drop old buffer, allocate new one of requested size (unless that is
+ equal to BUFSIZ, in which case we can use the one already allocated
+ by fopen().)
+ */
+ if ( size != BUFSIZ )
+ {
+ if ( ( buf = malloc( size ) ) == NULL )
+ {
+ return -1;
+ }
+ free( stream->buffer );
}
- 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))
- {
- stream->quickBin = 0;
}
- return (0);
+ /* Applying new settings to stream. */
+ stream->status &= ~( _IOFBF | _IOLBF | _IONBF );
+ stream->status |= mode;
+ stream->buffer = buf;
+ stream->bufsize = size;
+ stream->status &= ~_PDCLIB_VIRGINSTR;
+ return 0;
}
-*/
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+#ifndef REGTEST
+ TESTCASE( NO_TESTDRIVER );
+#else
+ puts( " NOTEST setvbuf() test driver is PDCLib-specific." );
+#endif
+ return TEST_RESULTS;
+}
+
+#endif