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63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
/*
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stdlib_noniso.h - nonstandard (but useful) conversion functions
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Copyright (c) 2021 David Gauchard. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "stdlib_noniso.h"
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// ulltoa() is slower than std::to_char() (1.6 times)
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// but is smaller by ~800B/flash and ~250B/rodata
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// ulltoa fills str backwards and can return a pointer different from str
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char* ulltoa(unsigned long long val, char* str, int slen, unsigned int radix)
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{
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str += --slen;
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*str = 0;
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do
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{
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auto mod = val % radix;
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val /= radix;
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*--str = mod + ((mod > 9) ? ('a' - 10) : '0');
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} while (--slen && val);
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return val? nullptr: str;
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}
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// lltoa fills str backwards and can return a pointer different from str
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char* lltoa (long long val, char* str, int slen, unsigned int radix)
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{
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bool neg;
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if (val < 0)
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{
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val = -val;
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neg = true;
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}
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else
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{
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neg = false;
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}
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char* ret = ulltoa(val, str, slen, radix);
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if (neg)
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{
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if (ret == str || ret == nullptr)
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return nullptr;
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*--ret = '-';
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}
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return ret;
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}
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