106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/****************************************************************************
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* libc/string/lib_isbasedigit.c
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*
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 charcter, 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 (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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