/* Copyright (C) 2001-2006 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 that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/*$Id: gslibctx.c 8022 2007-06-05 22:23:38Z giles $ */

/* library context functionality for ghostscript 
 * api callers get a gs_main_instance 
 */

/* Capture stdin/out/err before gs.h redefines them. */
#include "stdio_.h"

static void
gs_lib_ctx_get_real_stdio(FILE **in, FILE **out, FILE **err)
{
    *in = stdin;
    *out = stdout;
    *err = stderr;
}


#include "gslibctx.h"
#include "gsmemory.h"

static gs_memory_t *mem_err_print = NULL;


gs_memory_t *
gs_lib_ctx_get_non_gc_memory_t() 
{
    return mem_err_print ? mem_err_print->non_gc_memory : NULL;
}


int gs_lib_ctx_init( gs_memory_t *mem )
{
    gs_lib_ctx_t *pio = 0;

    if ( mem == 0 ) 
	return -1;  /* assert mem != 0 */

    mem_err_print = mem;
    
    if (mem->gs_lib_ctx) /* one time initialization */
	return 0;  

    pio = mem->gs_lib_ctx = 
	(gs_lib_ctx_t*)gs_alloc_bytes_immovable(mem, 
						sizeof(gs_lib_ctx_t), 
						"gs_lib_ctx_init");
    if( pio == 0 ) 
	return -1;
    pio->memory = mem;

    gs_lib_ctx_get_real_stdio(&pio->fstdin, &pio->fstdout, &pio->fstderr );

    pio->fstdout2 = NULL;
    pio->stdout_is_redirected = false;
    pio->stdout_to_stderr = false;
    pio->stdin_is_interactive = true;
    pio->stdin_fn = 0;
    pio->stdout_fn = 0;
    pio->stderr_fn = 0;
    pio->poll_fn = 0;

    /* id's 1 through 4 are reserved for Device color spaces; see gscspace.h */
    pio->gs_next_id = 5;  /* this implies that each thread has its own complete state */

    pio->dict_auto_expand = false;
    return 0;
}

/* Provide a single point for all "C" stdout and stderr.
 */

int outwrite(const gs_memory_t *mem, const char *str, int len)
{
    int code;
    FILE *fout;
    gs_lib_ctx_t *pio = mem->gs_lib_ctx;

    if (len == 0)
	return 0;
    if (pio->stdout_is_redirected) {
	if (pio->stdout_to_stderr)
	    return errwrite(str, len);
	fout = pio->fstdout2;
    }
    else if (pio->stdout_fn) {
	return (*pio->stdout_fn)(pio->caller_handle, str, len);
    }
    else {
	fout = pio->fstdout;
    }
    code = fwrite(str, 1, len, fout);
    fflush(fout);
    return code;
}

int errwrite(const char *str, int len)
{    
    int code;
    if (len == 0)
	return 0;
    if (mem_err_print->gs_lib_ctx->stderr_fn)
	return (*mem_err_print->gs_lib_ctx->stderr_fn)(mem_err_print->gs_lib_ctx->caller_handle, str, len);

    code = fwrite(str, 1, len, mem_err_print->gs_lib_ctx->fstderr);
    fflush(mem_err_print->gs_lib_ctx->fstderr);
    return code;
}

void outflush(const gs_memory_t *mem)
{
    if (mem->gs_lib_ctx->stdout_is_redirected) {
	if (mem->gs_lib_ctx->stdout_to_stderr) {
	    if (!mem->gs_lib_ctx->stderr_fn)
		fflush(mem->gs_lib_ctx->fstderr);
	}
	else
	    fflush(mem->gs_lib_ctx->fstdout2);
    }
    else if (!mem->gs_lib_ctx->stdout_fn)
        fflush(mem->gs_lib_ctx->fstdout);
}

void errflush(void)
{
    if (!mem_err_print->gs_lib_ctx->stderr_fn)
        fflush(mem_err_print->gs_lib_ctx->fstderr);
    /* else nothing to flush */
}


