gambas-source-code/main/gbx/gbx_stream_string.c

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/***************************************************************************
gbx_stream_string.c
(c) 2000-2017 Benoît Minisini <g4mba5@gmail.com>
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 2, 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
***************************************************************************/
#define __STREAM_IMPL_C
#include "gb_common.h"
#include "gb_common_check.h"
#include "gb_error.h"
#include "gbx_value.h"
#include "gb_limit.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <signal.h>
#include <setjmp.h>
#include "gbx_string.h"
#include "gbx_stream.h"
static int stream_open(STREAM *stream, const char *path, int mode)
{
stream->string.buffer = NULL;
stream->common.available_now = TRUE;
stream->string.size = 0;
stream->string.pos = 0;
return FALSE;
}
static int stream_close(STREAM *stream)
{
STRING_unref(&stream->string.buffer);
return FALSE;
}
static int stream_read(STREAM *stream, char *buffer, int len)
{
int max;
max = stream->string.size - stream->string.pos;
if (len > max)
{
len = max;
errno = 0;
}
if (len > 0)
memcpy(buffer, stream->string.buffer + stream->string.pos, len);
stream->string.pos += len;
return len;
}
static int stream_write(STREAM *stream, char *buffer, int len)
{
if ((stream->common.mode & GB_ST_WRITE) == 0)
THROW(E_ACCESS);
stream->string.buffer = STRING_add(stream->string.buffer, buffer, len);
stream->string.size += len;
stream->string.pos = stream->string.size;
return len;
}
static int stream_seek(STREAM *stream, int64_t pos, int whence)
{
int ipos = (int)pos;
if (pos != (int64_t)ipos || ipos < 0 || ipos > stream->string.size)
return TRUE;
stream->string.pos = ipos;
return FALSE;
}
static int stream_tell(STREAM *stream, int64_t *pos)
{
*pos = (int64_t)stream->string.pos;
return FALSE;
}
static int stream_flush(STREAM *stream)
{
return FALSE;
}
static int stream_eof(STREAM *stream)
{
return (stream->string.pos >= stream->string.size);
}
static int stream_lof(STREAM *stream, int64_t *len)
{
*len = STRING_length(stream->string.buffer);
return FALSE;
}
static int stream_handle(STREAM *stream)
{
return -1;
}
DECLARE_STREAM(STREAM_string);