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Transition FileX to Eclipse Fundation

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TiejunZhou
2024-01-02 07:35:14 +00:00
commit 14884808b5
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common/src/fx_directory_name_extract.c
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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. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** FileX Component */
/** */
/** Directory */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#include "fx_system.h"
#include "fx_directory.h"
#include "fx_utility.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_directory_name_extract PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function extracts the file name from the supplied input */
/* string. If there is nothing left after the extracted name, a NULL */
/* is returned to the caller. Otherwise, if something is left, a */
/* pointer to it is returned. */
/* */
/* INPUT */
/* */
/* source_ptr Source string pointer */
/* dest_ptr Destination string pointer */
/* */
/* OUTPUT */
/* */
/* Pointer to Next Name (if multiple directories) */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* FileX System Functions */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
CHAR *_fx_directory_name_extract(CHAR *source_ptr, CHAR *dest_ptr)
{
UINT i;
/* Set the destination string to NULL. */
dest_ptr[0] = 0;
/* Is a backslash present? */
if ((*source_ptr == '\\') || (*source_ptr == '/'))
{
/* Advance the string pointer. */
source_ptr++;
}
/* Loop to remove any leading spaces. */
while (*source_ptr == ' ')
{
/* Position past leading space. */
source_ptr++;
}
/* Loop to extract the name. */
i = 0;
while (*source_ptr)
{
/* If another backslash is present, break the loop. */
if ((*source_ptr == '\\') || (*source_ptr == '/'))
{
break;
}
/* Long name can be at most 255 characters, but are further limited by the
FX_MAX_LONG_NAME_LEN define. */
if (i == FX_MAX_LONG_NAME_LEN - 1)
{
break;
}
/* Store the character. */
dest_ptr[i] = *source_ptr++;
/* Increment the character counter. */
i++;
}
/* NULL-terminate the string. */
dest_ptr[i] = 0;
/* Determine if we can backup to the previous character. */
if (i)
{
/* Yes, we can move backwards. */
i--;
}
/* Get rid of trailing blanks in the destination string. */
while (dest_ptr[i] == ' ')
{
/* Set this entry to NULL. */
dest_ptr[i] = 0;
/* Backup to the next character. Since leading spaces have been removed,
we know that the index is always greater than 1. */
i--;
}
/* Determine if the source string is now at the end. */
if (*source_ptr == 0)
{
/* Yes, return a NULL pointer. */
source_ptr = FX_NULL;
}
/* Return the last pointer position in the source. */
return(source_ptr);
}