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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 */
/** */
/** Utility */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#include "fx_utility.h"
#ifdef FX_ENABLE_EXFAT
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_utility_absolute_path_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function converts concatenating of base and new path to */
/* absolute path. */
/* */
/* INPUT */
/* */
/* base_path Base (current) path */
/* new_path New path */
/* absolute_path Absolute Path */
/* */
/* OUTPUT */
/* */
/* absolute_path Resulting absolute path */
/* return status */
/* */
/* CALLS */
/* */
/* _fx_utility_token_length_get Get the next token length */
/* _fx_utility_string_length_get Get string length */
/* */
/* CALLED BY */
/* */
/* _fx_directory_default_set */
/* */
/* 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 */
/* */
/**************************************************************************/
UINT _fx_utility_absolute_path_get(CHAR *base_path, CHAR *new_path, CHAR *absolute_path)
{
UINT length;
UINT absolute_position;
UINT i;
/* Check if we got null pointers. */
if (!base_path || !new_path || !absolute_path)
{
/* Return error. */
return(FX_INVALID_PATH);
}
/* Is the new path starts from root? */
if ((new_path[0] == '\\') || (new_path[0] == '/'))
{
/* Yes, set the absolute path to root. */
absolute_path[0] = '\\';
absolute_path[1] = 0;
new_path++;
}
else
{
/* Initialize the absolute path with the base path. */
i = 0;
while ((base_path[i]) && (i < FX_MAXIMUM_PATH))
{
/* Copy a character. */
absolute_path[i] = base_path[i];
/* Move to next character. */
i++;
}
/* Is the absolute path still NULL? */
if ((absolute_path[0] == 0) || (i == 0))
{
/* Yes, set the absolute path to root. */
absolute_path[0] = '\\';
absolute_path[1] = 0;
}
}
/* Loop to add new path to the absolute path. */
while ((length = _fx_utility_token_length_get(new_path)) > 0)
{
/* Check if the path is too long. */
if ((new_path[length] != 0) && (new_path[length] != '\\') && (new_path[length] != '/'))
{
/* The path is too long, return error. */
return(FX_INVALID_PATH);
}
/* Check if we have a current directory mark. */
if ((length == 1) && (new_path[0] == '.'))
{
/* The same directory, just skip it. */
}
/* Do we have a parent directory mark? */
else if ((length == 2) && (new_path[0] == '.') && (new_path[1] == '.'))
{
/* Yes, we need to move the absolute path to the parent directory. */
/* Check absolute path length. */
absolute_position = _fx_utility_string_length_get(absolute_path, FX_MAXIMUM_PATH);
if ((absolute_position < 2) || (absolute_path[absolute_position] != 0))
{
/* No parent directory left in the absolute path, or invalid path length, return error. */
return(FX_INVALID_PATH);
}
/* Move to the last character of the absolute path. */
absolute_position--;
/* Check if we have a directory separator. */
if ((absolute_path[absolute_position] == '\\') || (absolute_path[absolute_position] == '/'))
{
/* Remove the separator. */
absolute_path[absolute_position] = 0;
absolute_position--;
}
/* Loop to clear the character backward until a seprator or string exhaust. */
while ((absolute_path[absolute_position] != '\\') && (absolute_path[absolute_position] != '/') && (absolute_position > 0))
{
/* Remove one character. */
absolute_path[absolute_position] = 0;
absolute_position--;
}
/* Do we have somthing left in the path? */
if (absolute_position > 1)
{
/* Yes, remove the last separator. */
absolute_path[absolute_position] = 0;
}
}
else
{
/* Normal directory, add it. */
absolute_position = _fx_utility_string_length_get(absolute_path, FX_MAXIMUM_PATH);
/* Check if the path is too long. */
if (absolute_path[absolute_position] != 0)
{
/* The path is too long, return error. */
return(FX_INVALID_PATH);
}
/* Check if we have something in the path. */
if (absolute_position)
{
/* Do we have a separator in the last character? */
if ((absolute_path[absolute_position - 1] != '\\') && (absolute_path[absolute_position - 1] != '/'))
{
/* No, add a directory separator to the path string. */
absolute_path[absolute_position] = '\\';
absolute_position++;
}
}
/* Loop to copy the new path to the absolute path. */
i = 0;
while ((absolute_position < FX_MAXIMUM_PATH) && (i < length))
{
/* Copy one character. */
absolute_path[absolute_position++] = new_path[i++];
}
/* Check if we have not exceed the maximum length. */
if (absolute_position < FX_MAXIMUM_PATH)
{
/* Terminate the string. */
absolute_path[absolute_position] = 0;
}
else
{
/* The path is too long, return error. */
return(FX_INVALID_PATH);
}
}
/* Move to the next component. */
new_path += length;
/* Is the next component starts with a separator? */
if ((new_path[0] == '\\') || (new_path[0] == '/'))
{
/* Yes, skip it. */
new_path++;
}
}
return(FX_SUCCESS);
}
#endif /* FX_ENABLE_EXFAT */
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