3d1383407c
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2338 42af7a65-404d-4744-a932-0658087f49c3
116 lines
3.7 KiB
C
116 lines
3.7 KiB
C
/****************************************************************************
|
|
* lib/lib_checkbase.c
|
|
*
|
|
* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* 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 <string.h>
|
|
#include <ctype.h>
|
|
|
|
#include "lib_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: lib_checkbase
|
|
*
|
|
* Description:
|
|
* This is part of the strol() family implementation. This function checks
|
|
* the initial part of a string to see if it can determine the numeric
|
|
* base that is represented.
|
|
*
|
|
* Assumptions:
|
|
* *ptr points to the first, non-whitespace character in the string.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int lib_checkbase(int base, const char **pptr)
|
|
{
|
|
const char *ptr = *pptr;
|
|
|
|
/* Check for unspecified base */
|
|
|
|
if (!base)
|
|
{
|
|
/* Assume base 10 */
|
|
|
|
base = 10;
|
|
|
|
/* Check for leading '0' - that would signify octal or hex (or binary) */
|
|
|
|
if (*ptr == '0')
|
|
{
|
|
/* Assume octal */
|
|
|
|
base = 8;
|
|
ptr++;
|
|
|
|
/* Check for hexidecimal */
|
|
|
|
if ((*ptr == 'X' || *ptr == 'x') &&
|
|
lib_isbasedigit(ptr[1], 16, NULL))
|
|
{
|
|
base = 16;
|
|
ptr++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If it a hexidecimal representation, than discard any leading "0X" or "0x" */
|
|
|
|
else if (base == 16)
|
|
{
|
|
if (ptr[0] == '0' && (ptr[1] == 'X' || ptr[1] == 'x'))
|
|
{
|
|
ptr += 2;
|
|
}
|
|
}
|
|
|
|
/* Return the updated pointer and base */
|
|
|
|
*pptr = ptr;
|
|
return base;
|
|
}
|
|
|