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113 lines
2.7 KiB
C++
113 lines
2.7 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <iostream>
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//#define NDEBUG
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#include <cassert>
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#include <string>
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#include <cstdio>
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#include <cstring>
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using namespace std;
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namespace
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{
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typedef int64_t longlong;
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string toString(int64_t t1, unsigned scale)
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{
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longlong int_val = (longlong)t1;
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// MySQL seems to round off values unless we use the string store method. Groan.
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// Taken from tablefuncs.cpp
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// biggest Calpont supports is DECIMAL(18,x), or 18 total digits+dp+sign
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const int ctmp_size = 18 + 1 + 1 + 1;
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char ctmp[ctmp_size];
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snprintf(ctmp, ctmp_size,
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#if __WORDSIZE <= 32
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"%lld",
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#else
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"%ld",
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#endif
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int_val);
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// we want to move the last dt_scale chars right by one spot to insert the dp
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// we want to move the trailing null as well, so it's really dt_scale+1 chars
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size_t l1 = strlen(ctmp);
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// need to make sure we have enough leading zeros for this to work...
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// at this point scale is always > 0
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char* ptr = &ctmp[0];
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if (int_val < 0)
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{
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ptr++;
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idbassert(l1 >= 2);
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l1--;
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}
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if (scale > l1)
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{
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const char* zeros = "000000000000000000"; // 18 0's
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size_t diff = scale - l1; // this will always be > 0
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memmove((ptr + diff), ptr, l1 + 1); // also move null
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memcpy(ptr, zeros, diff);
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l1 = 0;
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}
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else
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l1 -= scale;
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memmove((ptr + l1 + 1), (ptr + l1), scale + 1); // also move null
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*(ptr + l1) = '.';
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return string(ctmp);
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}
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} // namespace
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int main(int argc, char** argv)
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{
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int64_t x;
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string xstr;
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x = 10001LL;
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xstr = toString(x, 2);
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idbassert(xstr == "100.01");
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x = -10001LL;
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xstr = toString(x, 2);
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idbassert(xstr == "-100.01");
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x = 999999999999999999LL;
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xstr = toString(x, 2);
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idbassert(xstr == "9999999999999999.99");
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x = -999999999999999999LL;
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xstr = toString(x, 2);
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idbassert(xstr == "-9999999999999999.99");
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x = 1LL;
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xstr = toString(x, 5);
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idbassert(xstr == ".00001");
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x = -1LL;
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xstr = toString(x, 5);
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idbassert(xstr == "-.00001");
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x = -1LL;
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xstr = toString(x, 16);
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idbassert(xstr == "-.0000000000000001");
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return 0;
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}
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