92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/****************************************************************************
|
|
* libs/libc/string/lib_isbasedigit.c
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
|
|
#include "libc.h"
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: lib_isbasedigit
|
|
*
|
|
* Description:
|
|
* Given an ASCII character, ch, and a base (1-36) do two
|
|
* things: 1) Determine if ch is a valid character, and 2)
|
|
* convert ch to its binary value.
|
|
*
|
|
****************************************************************************/
|
|
|
|
bool lib_isbasedigit(int ch, int base, int *value)
|
|
{
|
|
bool ret = false;
|
|
int tmp = 0;
|
|
|
|
if (base <= 10)
|
|
{
|
|
if (ch >= '0' && ch <= base + '0' - 1)
|
|
{
|
|
tmp = ch - '0';
|
|
ret = true;
|
|
}
|
|
}
|
|
else if (base <= 36)
|
|
{
|
|
if (ch >= '0' && ch <= '9')
|
|
{
|
|
tmp = ch - '0';
|
|
ret = true;
|
|
}
|
|
else if (ch >= 'a' && ch <= 'a' + base - 11)
|
|
{
|
|
tmp = ch - 'a' + 10;
|
|
ret = true;
|
|
}
|
|
else if (ch >= 'A' && ch <= 'A' + base - 11)
|
|
{
|
|
tmp = ch - 'A' + 10;
|
|
ret = true;
|
|
}
|
|
}
|
|
|
|
if (ret && value)
|
|
{
|
|
*value = tmp;
|
|
}
|
|
|
|
return ret;
|
|
}
|