/*-

 * Copyright (c)2003 Citrus Project,

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include "dcmtk/config/osconfig.h"

#include "dcmtk/oficonv/iconv.h"

#include "citrus_bcs.h"

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

char *oficonv_path = NULL;

void OFiconv_setpath(const char *runtime_path) {

    if (oficonv_path) {

        free(oficonv_path);

        oficonv_path = NULL;

    }

    if (runtime_path) {

        oficonv_path = strdup(runtime_path);

    }

}

/*

 * case insensitive comparison between two C strings.

 */

int

_citrus_bcs_strcasecmp(const char * str1,

    const char * str2)

{

    int c1, c2;

    c1 = c2 = 1;

    while (c1 && c2 && c1 == c2) {

        c1 = _citrus_bcs_toupper(*str1++);

        c2 = _citrus_bcs_toupper(*str2++);

    }

    return ((c1 == c2) ? 0 : ((c1 > c2) ? 1 : -1));

}

/*

 * case insensitive comparison between two C strings with limitation of length.

 */

int

_citrus_bcs_strncasecmp(const char * str1,

    const char * str2, size_t sz)

{

    int c1, c2;

    c1 = c2 = 1;

    while (c1 && c2 && c1 == c2 && sz != 0) {

        c1 = _citrus_bcs_toupper(*str1++);

        c2 = _citrus_bcs_toupper(*str2++);

        sz--;

    }

    return ((c1 == c2) ? 0 : ((c1 > c2) ? 1 : -1));

}

/*

 * skip white space characters.

 */

const char *

_citrus_bcs_skip_ws(const char * p)

{

    while (*p && _citrus_bcs_isspace(*p))

        p++;

    return (p);

}

/*

 * skip non white space characters.

 */

const char *

_citrus_bcs_skip_nonws(const char * p)

{

    while (*p && !_citrus_bcs_isspace(*p))

        p++;

    return (p);

}

/*

 * skip white space characters with limitation of length.

 */

const char *

_citrus_bcs_skip_ws_len(const char * p, size_t * len)

{

    while (*len > 0 && *p && _citrus_bcs_isspace(*p)) {

        p++;

        (*len)--;

    }

    return (p);

}

/*

 * skip non white space characters with limitation of length.

 */

const char *

_citrus_bcs_skip_nonws_len(const char * p, size_t * len)

{

    while (*len > 0 && *p && !_citrus_bcs_isspace(*p)) {

        p++;

        (*len)--;

    }

    return (p);

}

/*

 * truncate trailing white space characters.

 */

void

_citrus_bcs_trunc_rws_len(const char * p, size_t * len)

{

    while (*len > 0 && _citrus_bcs_isspace(p[*len - 1]))

        (*len)--;

}

/*

 * destructive transliterate to lowercase.

 */

void

_citrus_bcs_convert_to_lower(char *s)

{

    while (*s) {

        *s = _citrus_bcs_tolower(*s);

        s++;

    }

}

/*

 * destructive transliterate to uppercase.

 */

void

_citrus_bcs_convert_to_upper(char *s)

{

    while (*s) {

        *s = _citrus_bcs_toupper(*s);

        s++;

    }

}

/*

 * compute path to data file

 */

void get_data_path(char *path_out, size_t path_size, const char *dirname, const char *filename)

{

    const char *env;

    const char *separator1;

    const char *separator2;

    size_t len;

    char sep[3];

#ifdef HAVE_WINDOWS_H

    char buf[OFICONV_PATH_MAX+1];

    memset(buf, 0, sizeof(buf));

#endif

    // create a string containing the path separator

    snprintf(sep, sizeof(sep), "%c", PATH_SEPARATOR);

    // retrieve the DCMICONVPATH environment variable

    env = getenv(OFICONV_PATH_VARIABLE);

    // if the environment variable is not set, use the runtime oficonv path instead:

    if ( env == NULL && oficonv_path != NULL ) env = oficonv_path;

    // if the environment variable is not set, use DEFAULT_SUPPORT_DATA_DIR instead

    if (env == NULL) env = DEFAULT_SUPPORT_DATA_DIR;

#ifdef HAVE_WINDOWS_H

    (void) ExpandEnvironmentStringsA(env, buf, sizeof(buf));

    env = buf;

#endif

    len = strlen(env);

    if (len == 0) separator1 = ""; // empty path, don't add path separator

    else

    {

        if ((env[len-1] == PATH_SEPARATOR)||(env[len-1] == '/'))

            separator1 = ""; // path already ends with path separator

            else separator1 = sep; // add path separator

    }

    // use non-empty separator 2 only if filename is present and non-empty

    if (filename && (strlen(filename) > 0))

        separator2 = sep;

        else separator2 = "";

    // replace NULL filename with empty filename

    if (filename == NULL) filename = "";

    // finally print full path

    snprintf(path_out, path_size, "%s%s%s%s%s", env, separator1, dirname, separator2, filename);

}