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