/* Copyright (C) 2001-2023 Artifex Software, Inc.
   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.

   Refer to licensing information at http://www.artifex.com or contact
   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,
   CA 94129, USA, for further information.
*/


/* %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, iodev_no_finit, 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\
        }, \
        NULL, \
        NULL \
}

#define STDIO_BUF_SIZE 128
static 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;
}
static int
noclose(FILE *file)
{
    return 0;
}
static int
stdio_open(gx_io_device * iodev, const char *access, stream ** ps,
           gs_memory_t * mem, char rw, FILE *file,
           void (*srw_file)(stream *, gp_file *, byte *, uint))
{
    stream *s;
    byte *buf;
    gp_file *f;

    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)");
    f = gp_file_FILE_alloc(mem);
    if (s == 0 || buf == 0 || f == NULL) {
        gs_free_object(mem, buf, "stdio_open(buffer)");
        gs_free_object(mem, s, "stdio_open(stream)");
        gp_file_dealloc(f);
        return_error(gs_error_VMerror);
    }
    gp_file_FILE_set(f, file, noclose);
    srw_file(s, f, buf, STDIO_BUF_SIZE);
    s->procs.close = stdio_close_file;
    *ps = s;
    return 0;
}

static 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->core->fstdin, sread_file);
}
const gx_io_device gs_iodev_stdin = iodev_stdio("%stdin%", stdin_open);

static 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->core->fstdout, swrite_file);
}
const gx_io_device gs_iodev_stdout = iodev_stdio("%stdout%", stdout_open);

static 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->core->fstderr, swrite_file);
}
const gx_io_device gs_iodev_stderr = iodev_stdio("%stderr%", stderr_open);