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/* Output stream that accumulates the output in memory.
Copyright (C) 2006-2007, 2015 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2006.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "memory-ostream.h"
#include <stdlib.h>
#include <string.h>
#include "error.h"
#include "xalloc.h"
#include "xsize.h"
#include "gettext.h"
#define _(str) gettext (str)
struct memory_ostream : struct ostream
{
fields:
char *buffer; /* Buffer containing the accumulated output. */
size_t buflen; /* Number of bytes stored so far. */
size_t allocated; /* Allocated size of the buffer. */
};
/* Implementation of ostream_t methods. */
static void
memory_ostream::write_mem (memory_ostream_t stream,
const void *data, size_t len)
{
if (len > 0)
{
if (len > stream->allocated - stream->buflen)
{
size_t new_allocated =
xmax (xsum (stream->buflen, len),
xsum (stream->allocated, stream->allocated));
if (size_overflow_p (new_allocated))
error (EXIT_FAILURE, 0,
_("%s: too much output, buffer size overflow"),
"memory_ostream");
stream->buffer = (char *) xrealloc (stream->buffer, new_allocated);
stream->allocated = new_allocated;
}
memcpy (stream->buffer + stream->buflen, data, len);
stream->buflen += len;
}
}
static void
memory_ostream::flush (memory_ostream_t stream)
{
}
static void
memory_ostream::free (memory_ostream_t stream)
{
free (stream->buffer);
free (stream);
}
/* Implementation of memory_ostream_t methods. */
void
memory_ostream::contents (memory_ostream_t stream,
const void **bufp, size_t *buflenp)
{
*bufp = stream->buffer;
*buflenp = stream->buflen;
}
/* Constructor. */
memory_ostream_t
memory_ostream_create (void)
{
memory_ostream_t stream = XMALLOC (struct memory_ostream_representation);
stream->base.vtable = &memory_ostream_vtable;
stream->allocated = 250;
stream->buffer = XNMALLOC (stream->allocated, char);
stream->buflen = 0;
return stream;
}
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