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9ea7bc457e
The strto* interfaces document explicit bases in the range 2 through 36, and lib_isbasedigit() already supports alphabetic digits through base 36. However, lib_checkbase() rejects every explicit base above 26 with EINVAL. Raise the validation limit to 36 so the conversion interfaces accept the full documented range while continuing to reject base 37 and above. Signed-off-by: hanzhijian <hanzhijian@zepp.com>
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/****************************************************************************
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* libs/libc/stdlib/lib_checkbase.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <string.h>
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#include <ctype.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_checkbase
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*
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* Description:
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* This is part of the strol() family implementation. This function checks
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* the initial part of a string to see if it can determine the numeric
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* base that is represented.
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*
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* Assumptions:
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* *ptr points to the first, non-whitespace character in the string.
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*
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* Returned Value:
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* - if base is valid, the actual base to use, and pptr is updated to point
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* at the first digit.
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* - if base is invalid (<2 or >36), return -1.
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*
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****************************************************************************/
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int lib_checkbase(int base, FAR const char **pptr)
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{
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FAR const char *ptr = *pptr;
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/* Check for unspecified base */
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if (!base)
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{
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/* Assume base 10 */
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base = 10;
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/* Check for leading '0' - that would signify octal
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* or hex (or binary)
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*/
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if (*ptr == '0')
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{
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/* Assume octal */
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if (lib_isbasedigit(ptr[1], 8, NULL))
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{
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base = 8;
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ptr++;
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}
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/* Check for hexadecimal */
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else if ((ptr[1] == 'X' || ptr[1] == 'x') &&
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lib_isbasedigit(ptr[2], 16, NULL))
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{
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base = 16;
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ptr += 2;
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}
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}
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}
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/* If it a hexadecimal representation,
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* than discard any leading "0X" or "0x"
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*/
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else if (base == 16)
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{
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if (ptr[0] == '0' && (ptr[1] == 'X' || ptr[1] == 'x'))
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{
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ptr += 2;
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}
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}
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/* Check for incorrect bases. */
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else if (base < 2 || base > 36)
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{
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return -1; /* Means incorrect base */
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}
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/* Return the updated pointer and base */
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*pptr = ptr;
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return base;
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}
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