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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Utility */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_utility_string_to_unicode PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function converts a ascii string to a unicode string. */
/* */
/* Note: */
/* The unicode string length (including NULL-terminator) is limited by */
/* length in a byte, so max ascii string length must be no more than */
/* 254 (NULL-terminator excluded). Only first 254 characters */
/* are converted if the string is too long. */
/* The buffer of destination must have enough space for result, at */
/* least 1 + (strlen(source) + 1) * 2 bytes. */
/* */
/* INPUT */
/* */
/* source Ascii String */
/* destination Unicode String */
/* */
/* OUTPUT */
/* */
/* none */
/* */
/* CALLS */
/* */
/* _ux_utility_string_length_check Check and return C string */
/* length */
/* */
/* CALLED BY */
/* */
/* USBX Components */
/* */
/**************************************************************************/
VOID _ux_utility_string_to_unicode(UCHAR *source, UCHAR *destination)
{
UINT string_length;
/* Get the ascii string length, when there is error length is not modified so max length is used. */
string_length = 254;
_ux_utility_string_length_check(source, &string_length, 254);
/* Set the length of the string as the first byte of the unicode string.
The length is casted as a byte since Unicode strings cannot be more than 255 chars. */
*destination++ = (UCHAR)(string_length + 1);
while(string_length--)
{
/* First character is from the source. */
*destination++ = *source++;
/* Second character of unicode word is 0. */
*destination++ = 0;
}
/* Finish with a 0. */
*destination++ = 0;
/* Finish with a 0. */
*destination++ = 0;
/* We are done. */
return;
}
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