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/**
* \file utf8convert.c
*
* UTF8 conversion functions
*/
/* XTrackCad - Model Railroad CAD
* Copyright (C) 2020 Martin Fischer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include <wlib.h>
#include "misc.h"
#include "include/utf8convert.h"
/**
* Convert to UTF-8. The string must by a dynamically allocated storage block
* allocated with MyMalloc(). The functions returns a pointer to the converted
* string. If no conversion was necessary the returned string is identical to
* the parameter. Otherwise a new buffer is allocated and returned.
*
* \param [in] string If non-null, the string.
*
* \returns a pointer to a MyMalloc'ed string in UTF-8 format.
*/
char *
Convert2UTF8( char *string )
{
if (RequiresConvToUTF8(string)) {
unsigned cnt = strlen(string) * 2 + 2;
unsigned char *out = MyMalloc(cnt);
wSystemToUTF8(string, out, cnt);
MyFree(string);
return(out);
} else {
return(string);
}
}
/**
* Convert a string from UTF-8 to system codepage in place. As the length of
* the result most be equal or smaller than the input this is a safe
* approach.
*
* \param [in,out] in the string to be converted
*/
void
ConvertUTF8ToSystem(unsigned char *in)
{
if (wIsUTF8(in)) {
unsigned cnt = strlen(in) * 2 + 1;
unsigned char *out = MyMalloc(cnt);
wUTF8ToSystem(in, out, cnt);
strcpy(in, out);
MyFree(out);
}
}
/**
* Requires convert to UTF-8 If at least one character is >127 the string
* has to be converted.
*
* \param [in9 string the string.
*
* \returns True if conversion is required, false if not.
*/
bool
RequiresConvToUTF8(char *string)
{
while (*string) {
if (*string++ & 0x7F) {
return(true);
}
}
return(false);
}
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