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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Utility */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_utility_string_length_check PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks if a NULL-terminated C string reaches its end */
/* before specified length exceeds. */
/* */
/* On success the actual length of C string is written back to UINT */
/* variable pointed by string_length_ptr (if not NULL). */
/* Otherwise the variable keeps untouched. */
/* */
/* INPUT */
/* */
/* string Pointer to string */
/* string_length_ptr Pointer to UINT to receive */
/* the string length */
/* max_string_length Max string length */
/* */
/* OUTPUT */
/* */
/* returns success if the string length was less than the max length, */
/* else it returns error */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* USBX Components */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _ux_utility_string_length_check(UCHAR *string, UINT *string_length_ptr, UINT max_string_length)
{
UINT string_length;
if (string == UX_NULL)
return(UX_ERROR);
string_length = 0;
while (1)
{
if (string[string_length] == '\0')
break;
string_length++;
if (string_length > max_string_length)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_UTILITY, UX_ERROR);
return(UX_ERROR);
}
}
if (string_length_ptr)
*string_length_ptr = string_length;
return(UX_SUCCESS);
}