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105 lines
3.4 KiB
105 lines
3.4 KiB
/**************************************************************************** |
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* lib/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 <spudmonkey@racsa.co.cr> |
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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 "lib_internal.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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