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78 lines
2.5 KiB
78 lines
2.5 KiB
12 years ago
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/* Copyright (c) 2005, Dmitry Xmelkov
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All rights reserved.
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Rewritten in C by Soren Kuula
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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 are met:
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* 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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* 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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* Neither the name of the copyright holders nor the names of
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN 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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#include <stdint.h>
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#include "xtoa_fast.h"
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12 years ago
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char * ultoa_invert (uint32_t val, char *s, uint8_t base) {
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12 years ago
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if (base == 8) {
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do {
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*s = '0' + (val & 0x7);
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val >>= 3;
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} while(val);
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return s;
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}
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if (base == 16) {
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do {
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uint8_t digit = '0' + (val & 0xf);
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#if XTOA_UPPER == 0
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if (digit > '0' + 9)
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digit += ('a' - '0' - 10);
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#else
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if (digit > '0' + 9)
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digit += ('A' - '0' - 10);
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#endif
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*s++ = digit;
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val >>= 4;
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} while(val);
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return s;
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}
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// Every base which in not hex and not oct is considered decimal.
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// 33 bits would have been enough.
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uint64_t xval = val;
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do {
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uint8_t saved = xval;
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xval &= ~1;
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xval += 2;
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xval += xval >> 1; // *1.5
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xval += xval >> 4; // *1.0625
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xval += xval >> 8; // *1.00390625
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xval += xval >> 16; // *1.000015259
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xval += xval >> 32; // it all amounts to *1.6
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xval >>= 4; // /16 ... so *1.6/16 is /10, fraction truncated.
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*s++ = '0' + saved - 10 * (uint8_t)xval;
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} while (xval);
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return s;
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}
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