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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** Utility */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_utility_string_to_unicode PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function converts a ascii string to a unicode string. */ |
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/* */ |
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/* Note: */ |
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/* The unicode string length (including NULL-terminator) is limited by */ |
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/* length in a byte, so max ascii string length must be no more than */ |
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/* 254 (NULL-terminator excluded). Only first 254 characters */ |
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/* are converted if the string is too long. */ |
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/* The buffer of destination must have enough space for result, at */ |
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/* least 1 + (strlen(source) + 1) * 2 bytes. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* source Ascii String */ |
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/* destination Unicode String */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* none */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_utility_string_length_check Check and return C string */ |
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/* length */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* USBX Components */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */ |
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/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* */ |
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/**************************************************************************/ |
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VOID _ux_utility_string_to_unicode(UCHAR *source, UCHAR *destination) |
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{ |
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UINT string_length; |
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/* Get the ascii string length, when there is error length is not modified so max length is used. */ |
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string_length = 254; |
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_ux_utility_string_length_check(source, &string_length, 254); |
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/* Set the length of the string as the first byte of the unicode string. |
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The length is casted as a byte since Unicode strings cannot be more than 255 chars. */ |
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*destination++ = (UCHAR)(string_length + 1); |
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✓✓ |
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while(string_length--) |
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{ |
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/* First character is from the source. */ |
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*destination++ = *source++; |
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/* Second character of unicode word is 0. */ |
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*destination++ = 0; |
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} |
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/* Finish with a 0. */ |
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*destination++ = 0; |
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/* Finish with a 0. */ |
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*destination++ = 0; |
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/* We are done. */ |
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return; |
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} |
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