/* Copyright (C) 1993, 1999 Aladdin Enterprises.  All rights reserved.

   This file is part of Aladdin Ghostscript.

   Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
   or distributor accepts any responsibility for the consequences of using it,
   or for whether it serves any particular purpose or works at all, unless he
   or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
   License (the "License") for full details.

   Every copy of Aladdin Ghostscript must include a copy of the License,
   normally in a plain ASCII text file named PUBLIC.  The License grants you
   the right to copy, modify and redistribute Aladdin Ghostscript, but only
   under certain conditions described in the License.  Among other things, the
   License requires that the copyright notice and this notice be preserved on
   all copies.
 */

/*$Id: gsfname.c $ */
/* File name utilities */
#include "memory_.h"
#include "gserror.h"
#include "gserrors.h"
#include "gsmemory.h"
#include "gstypes.h"
#include "gsfname.h"
#include "gxiodev.h"

/* Parse a file name into device and individual name. */
/* The device may be NULL, or the name may be NULL, but not both. */
/* According to the Adobe documentation, %device and %device% */
/* are equivalent; both return name==NULL. */
int
gs_parse_file_name(gs_parsed_file_name_t * pfn, const char *pname, uint len)
{
    uint dlen;
    const char *pdelim;
    gx_io_device *iodev;

    if (len == 0)
	return_error(gs_error_undefinedfilename); /* null name not allowed */
    if (pname[0] != '%') {	/* no device */
	pfn->memory = 0;
	pfn->iodev = NULL;
	pfn->fname = pname;
	pfn->len = len;
	return 0;
    }
    pdelim = memchr(pname + 1, '%', len - 1);
    if (pdelim == NULL)		/* %device */
	dlen = len;
    else if (pdelim[1] == 0) {	/* %device% */
	pdelim = NULL;
	dlen = len;
    } else {
	dlen = pdelim - pname;
	pdelim++, len--;
    }
    iodev = gs_findiodevice((const byte *)pname, dlen);
    if (iodev == 0)
	return_error(gs_error_undefinedfilename);
    pfn->memory = 0;
    pfn->iodev = iodev;
    pfn->fname = pdelim;
    pfn->len = len - dlen;
    return 0;
}

/* Parse a real (non-device) file name and convert to a C string. */
int
gs_parse_real_file_name(gs_parsed_file_name_t * pfn, const char *pname,
			uint len, gs_memory_t *mem, client_name_t cname)
{
    int code = gs_parse_file_name(pfn, pname, len);

    if (code < 0)
	return code;
    if (pfn->len == 0)
	return_error(gs_error_invalidfileaccess);	/* device only */
    return gs_terminate_file_name(pfn, mem, cname);
}

/* Convert a file name to a C string by adding a null terminator. */
int
gs_terminate_file_name(gs_parsed_file_name_t * pfn, gs_memory_t *mem,
		       client_name_t cname)
{
    uint len = pfn->len;
    char *fname;

    if (pfn->iodev == NULL)	/* no device */
	pfn->iodev = iodev_default;
    if (pfn->memory)
	return 0;		/* already copied */
    /* Copy the file name to a C string. */
    fname = (char *)gs_alloc_string(mem, len + 1, cname);
    if (fname == 0)
	return_error(gs_error_VMerror);
    memcpy(fname, pfn->fname, len);
    fname[len] = 0;
    pfn->memory = mem;
    pfn->fname = fname;
    pfn->len = len + 1;		/* null terminator */
    return 0;
}

/* Free a file name that was copied to a C string. */
void
gs_free_file_name(gs_parsed_file_name_t * pfn, client_name_t cname)
{
    if (pfn->fname != 0)
	gs_free_const_string(pfn->memory, (const byte *)pfn->fname, pfn->len,
			     cname);
}
