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/* Copyright (C) 2000 Aladdin Enterprises.  All rights reserved.
  
  This software is provided AS-IS with no warranty, either express or
  implied.
  
  This software is distributed under license and may not be copied,
  modified or distributed except as expressly authorized under the terms
  of the license contained in the file LICENSE in this distribution.
  
  For more information about licensing, please refer to
  http://www.ghostscript.com/licensing/. For information on
  commercial licensing, go to http://www.artifex.com/licensing/ or
  contact Artifex Software, Inc., 101 Lucas Valley Road #110,
  San Rafael, CA  94903, U.S.A., +1(415)492-9861.
*/

/* $Id: gsiodevs.c,v 1.6 2004/08/04 19:36:12 stefan Exp $ */
/* %stdxxx IODevice implementation for non-PostScript configurations */
#include "gx.h"
#include "gserrors.h"
#include "gxiodev.h"
#include "stream.h"
#include "strimpl.h"

const char iodev_dtype_stdio[] = "Special";
#define iodev_stdio(dname, open) {\
    dname, iodev_dtype_stdio,\
        { iodev_no_init, open, iodev_no_open_file,\
          iodev_no_fopen, iodev_no_fclose,\
          iodev_no_delete_file, iodev_no_rename_file, iodev_no_file_status,\
          iodev_no_enumerate_files, NULL, NULL,\
          iodev_no_get_params, iodev_no_put_params\
        }\
}

#define STDIO_BUF_SIZE 128
private int
stdio_close_file(stream *s)
{
    /* Don't close stdio files, but do free the buffer. */
    gs_memory_t *mem = s->memory;

    s->file = 0;
    gs_free_object(mem, s->cbuf, "stdio_close_file(buffer)");
    return 0;
}
private int
stdio_open(gx_io_device * iodev, const char *access, stream ** ps,
           gs_memory_t * mem, char rw, FILE *file,
           void (*srw_file)(stream *, FILE *, byte *, uint))
{
    stream *s;
    byte *buf;

    if (!streq1(access, rw))
        return_error(gs_error_invalidfileaccess);
    s = s_alloc(mem, "stdio_open(stream)");
    buf = gs_alloc_bytes(mem, STDIO_BUF_SIZE, "stdio_open(buffer)");
    if (s == 0 || buf == 0) {
        gs_free_object(mem, buf, "stdio_open(buffer)");
        gs_free_object(mem, s, "stdio_open(stream)");
        return_error(gs_error_VMerror);
    }
    srw_file(s, file, buf, STDIO_BUF_SIZE);
    s->procs.close = stdio_close_file;
    *ps = s;
    return 0;
}

private int
stdin_open(gx_io_device * iodev, const char *access, stream ** ps,
           gs_memory_t * mem)
{
    return stdio_open(iodev, access, ps, mem, 'r', 
                      mem->gs_lib_ctx->fstdin, sread_file);
}
const gx_io_device gs_iodev_stdin = iodev_stdio("%stdin%", stdin_open);

private int
stdout_open(gx_io_device * iodev, const char *access, stream ** ps,
            gs_memory_t * mem)
{
    return stdio_open(iodev, access, ps, mem, 'w', 
                      mem->gs_lib_ctx->fstdout, swrite_file);
}
const gx_io_device gs_iodev_stdout = iodev_stdio("%stdout%", stdout_open);

private int
stderr_open(gx_io_device * iodev, const char *access, stream ** ps,
            gs_memory_t * mem)
{
    return stdio_open(iodev, access, ps, mem, 'w', 
                      mem->gs_lib_ctx->fstderr, swrite_file);
}
const gx_io_device gs_iodev_stderr = iodev_stdio("%stderr%", stderr_open);