85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_ultoa_invert.c
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*
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* Copyright © 2017, Keith Packard
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* All rights reserved.
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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 "lib_ultoa_invert.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#ifdef CONFIG_LIBC_LONG_LONG
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FAR char *__ultoa_invert(unsigned long long val, FAR char *str, int base)
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#else
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FAR char *__ultoa_invert(unsigned long val, FAR char *str, int base)
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#endif
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{
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int upper = 0;
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if (base & XTOA_UPPER)
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{
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upper = 1;
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base &= ~XTOA_UPPER;
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}
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do
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{
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int v;
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v = val % base;
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val = val / base;
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if (v <= 9)
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{
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v += '0';
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}
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else
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{
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if (upper)
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v += 'A' - 10;
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else
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v += 'a' - 10;
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}
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*str++ = v;
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}
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while (val);
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return str;
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}
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