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-rw-r--r--app/bin/utf8convert.c96
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diff --git a/app/bin/utf8convert.c b/app/bin/utf8convert.c
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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);
+}
+
+