px4-firmware/nuttx/lib/string/lib_isbasedigit.c

106 lines
3.4 KiB
C

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