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Copy pathutf8printf.cpp
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2404 lines (2056 loc) · 73.4 KB
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/******************************************************************************
* The MIT License (MIT)
*
* Copyright (c) 2015-2026 Baldur Karlsson
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
******************************************************************************/
#include <wchar.h>
#include "common/common.h"
#include "common/formatting.h"
#include "os/os_specific.h"
// grisu2 double-to-string function, returns number of digits written to digits array
int grisu2(uint64_t mantissa, int exponent, char digits[18], int &kout);
static int wchar2multibyte(wchar_t chr, char mbchr[4])
{
// U+00000 -> U+00007F 1 byte 0xxxxxxx
// U+00080 -> U+0007FF 2 bytes 110xxxxx 10xxxxxx
// U+00800 -> U+00FFFF 3 bytes 1110xxxx 10xxxxxx 10xxxxxx
// U+10000 -> U+1FFFFF 4 bytes 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
// upcast to uint32_t, so we do the same processing on windows where
// sizeof(wchar_t) == 2
uint32_t wc = (uint32_t)chr;
if(wc > 0x10FFFF)
wc = 0xFFFD; // replacement character
if(wc <= 0x7f)
{
mbchr[0] = (char)wc;
return 1;
}
else if(wc <= 0x7ff)
{
mbchr[1] = 0x80 | (char)(wc & 0x3f);
wc >>= 6;
mbchr[0] = 0xC0 | (char)(wc & 0x1f);
return 2;
}
else if(wc <= 0xffff)
{
mbchr[2] = 0x80 | (char)(wc & 0x3f);
wc >>= 6;
mbchr[1] = 0x80 | (char)(wc & 0x3f);
wc >>= 6;
mbchr[0] = 0xE0 | (char)(wc & 0x0f);
wc >>= 4;
return 3;
}
else
{
// invalid codepoints above 0x10FFFF were replaced above
mbchr[3] = 0x80 | (char)(wc & 0x3f);
wc >>= 6;
mbchr[2] = 0x80 | (char)(wc & 0x3f);
wc >>= 6;
mbchr[1] = 0x80 | (char)(wc & 0x3f);
wc >>= 6;
mbchr[0] = 0xF0 | (char)(wc & 0x07);
wc >>= 3;
return 4;
}
}
///////////////////////////////////////////////////////////////////////////////
// functions for appending to output (handling running out of buffer space)
void addchar(char *&output, size_t &actualsize, char *end, char c)
{
actualsize++;
if(output == end)
return;
*(output++) = c;
}
void addchars(char *&output, size_t &actualsize, char *end, size_t num, char c)
{
actualsize += num;
for(size_t i = 0; output != end && i < num; i++)
*(output++) = c;
}
void appendstring(char *&output, size_t &actualsize, char *end, const char *str, size_t len)
{
for(size_t i = 0; i < len; i++)
{
if(str[i] == 0)
return;
actualsize++;
if(output != end)
*(output++) = str[i];
}
}
void appendstring(char *&output, size_t &actualsize, char *end, const char *str)
{
for(size_t i = 0; *str; i++)
{
actualsize++;
if(output != end)
*(output++) = *str;
str++;
}
}
///////////////////////////////////////////////////////////////////////////////
// Flags and general formatting parameters
enum FormatterFlags
{
LeftJustify = 0x1,
PrependPos = 0x2,
PrependSpace = 0x4,
AlternateForm = 0x8,
PadZeroes = 0x10,
// non standard
AlwaysDecimal = 0x20,
};
enum LengthModifier
{
None,
HalfHalf,
Half,
Long,
LongLong,
SizeT,
};
struct FormatterParams
{
FormatterParams() : Flags(0), Width(NoWidth), Precision(NoPrecision), Length(None) {}
int Flags;
int Width;
int Precision;
LengthModifier Length;
// can't set negative width, so -1 indicates no width specified
static const int NoWidth = -1;
// can't set negative precision, so -1 indicates no precision specified
static const int NoPrecision = -1;
// VarArgs precision - for %.*s strings
static const int VarPrecision = -2;
};
///////////////////////////////////////////////////////////////////////////////
// Print a number in a specified base (16, 8, 10 or 2 supported)
void PrintInteger(bool typeUnsigned, uint64_t argu, int base, uint64_t numbits,
FormatterParams formatter, bool uppercaseDigits, char *&output,
size_t &actualsize, char *end)
{
int64_t argi = 0;
union
{
uint64_t *u64;
signed int *i;
signed char *c;
signed short *s;
int64_t *i64;
} typepun;
typepun.u64 = &argu;
// cast the appropriate size to signed version
switch(formatter.Length)
{
default:
case None:
case Long: argi = (int64_t)*typepun.i; break;
case HalfHalf: argi = (int64_t)*typepun.c; break;
case Half: argi = (int64_t)*typepun.s; break;
case LongLong: argi = (int64_t)*typepun.i64; break;
#if ENABLED(RDOC_X64)
RDCCOMPILE_ASSERT(sizeof(size_t) == sizeof(int64_t), "64-bit macros are wrong");
case SizeT: argi = (int64_t)*typepun.i64; break;
#else
RDCCOMPILE_ASSERT(sizeof(size_t) == sizeof(int32_t), "64-bit macros are wrong");
case SizeT: argi = (int64_t)*typepun.i; break;
#endif
}
bool negative = false;
if(base == 10 && !typeUnsigned)
{
negative = argi < 0;
}
int digwidth = 0;
int numPad0s = 0;
int numPadWidth = 0;
{
int intwidth = 0;
int digits = 0;
// work out the number of decimal digits in the integer
if(!negative)
{
uint64_t accum = argu;
while(accum)
{
digits += 1;
accum /= base;
}
}
else
{
int64_t accum = argi;
while(accum)
{
digits += 1;
accum /= base;
}
}
intwidth = digwidth = RDCMAX(1, digits);
// printed int is 2 chars larger for 0x or 0b, and 1 char for 0 (octal)
if(base == 16 || base == 2)
intwidth += formatter.Flags & AlternateForm ? 2 : 0;
if(base == 8)
intwidth += formatter.Flags & AlternateForm ? 1 : 0;
if(formatter.Precision != FormatterParams::NoPrecision && formatter.Precision > intwidth)
numPad0s = formatter.Precision - intwidth;
intwidth += numPad0s;
// for decimal we can have a negative sign (or placeholder)
if(base == 10)
{
if(negative)
intwidth++;
else if(formatter.Flags & (PrependPos | PrependSpace))
intwidth++;
}
if(formatter.Width != FormatterParams::NoWidth && formatter.Width > intwidth)
numPadWidth = formatter.Width - intwidth;
}
// pad with spaces if necessary
if((formatter.Flags & (LeftJustify | PadZeroes)) == 0 && numPadWidth > 0)
addchars(output, actualsize, end, (size_t)numPadWidth, ' ');
if(base == 16)
{
if(formatter.Flags & AlternateForm)
{
appendstring(output, actualsize, end, "0x");
}
// pad with 0s as appropriate
if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)
addchars(output, actualsize, end, (size_t)numPadWidth, '0');
if(numPad0s > 0)
addchars(output, actualsize, end, (size_t)numPad0s, '0');
bool left0s = true;
// mask off each hex digit and print
for(uint64_t i = 0; i < numbits; i += 4)
{
uint64_t shift = numbits - 4 - i;
uint64_t mask = 0xfULL << shift;
char digit = char((argu & mask) >> shift);
if(digit == 0 && left0s && i + 4 < numbits)
continue;
left0s = false;
if(digit < 10)
addchar(output, actualsize, end, '0' + digit);
else if(uppercaseDigits)
addchar(output, actualsize, end, 'A' + digit - 10);
else
addchar(output, actualsize, end, 'a' + digit - 10);
}
}
else if(base == 8)
{
if(formatter.Flags & AlternateForm)
appendstring(output, actualsize, end, "0");
if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)
addchars(output, actualsize, end, (size_t)numPadWidth, '0');
if(numPad0s > 0)
addchars(output, actualsize, end, (size_t)numPad0s, '0');
// octal digits don't quite fit into typical integer sizes,
// so instead we pretend the number is a little bigger, then
// the shift just fills out the upper bits with 0s.
uint64_t offs = 0;
if(numbits % 3 == 1)
offs = 2;
if(numbits % 3 == 2)
offs = 1;
bool left0s = true;
for(uint64_t i = 0; i < numbits; i += 3)
{
uint64_t shift = numbits - 3 - i + offs;
uint64_t mask = 0x7ULL << shift;
char digit = char((argu & mask) >> shift);
if(digit == 0 && left0s && i + 3 < numbits)
continue;
left0s = false;
addchar(output, actualsize, end, '0' + digit);
}
}
else if(base == 2)
{
if(formatter.Flags & AlternateForm)
{
if(uppercaseDigits)
appendstring(output, actualsize, end, "0B");
else
appendstring(output, actualsize, end, "0b");
}
if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)
addchars(output, actualsize, end, (size_t)numPadWidth, '0');
if(numPad0s > 0)
addchars(output, actualsize, end, (size_t)numPad0s, '0');
bool left0s = true;
for(uint64_t i = 0; i < numbits; i++)
{
uint64_t shift = numbits - 1 - i;
uint64_t mask = 0x1ULL << shift;
char digit = char((argu & mask) >> shift);
if(digit == 0 && left0s && i + 1 < numbits)
continue;
left0s = false;
addchar(output, actualsize, end, '0' + digit);
}
}
else
{
// buffer large enough for any int (up to 64bit unsigned)
char intbuf[32] = {0};
// handle edge case of INT_MIN so we can negate the number and be sure we
// won't actualsize
if(argu == 0x8000000000000000)
{
addchar(output, actualsize, end, '-');
if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)
addchars(output, actualsize, end, (size_t)numPadWidth, '0');
if(numPad0s > 0)
addchars(output, actualsize, end, (size_t)numPad0s, '0');
appendstring(output, actualsize, end, "9223372036854775808");
}
else
{
// we know we can negate without loss of precision because we handled 64bit INT_MIN above
if(negative)
{
addchar(output, actualsize, end, '-');
argi = -argi;
}
else if(formatter.Flags & PrependPos)
addchar(output, actualsize, end, '+');
else if(formatter.Flags & PrependSpace)
addchar(output, actualsize, end, ' ');
if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)
addchars(output, actualsize, end, (size_t)numPadWidth, '0');
if(numPad0s > 0)
addchars(output, actualsize, end, (size_t)numPad0s, '0');
if(typeUnsigned)
{
uint64_t accum = argu;
for(int i = 0; i < digwidth; i++)
{
int digit = accum % 10;
accum /= 10;
intbuf[digwidth - 1 - i] = char('0' + digit);
}
}
else
{
int64_t accum = argi;
for(int i = 0; i < digwidth; i++)
{
int digit = accum % 10;
accum /= 10;
intbuf[digwidth - 1 - i] = char('0' + digit);
}
}
char *istr = intbuf;
while(*istr == '0')
istr++;
if(*istr == 0 && istr > intbuf)
istr--;
appendstring(output, actualsize, end, istr);
}
}
// if we were left justifying, pad on the right with spaces
if((formatter.Flags & LeftJustify) && numPadWidth > 0)
{
addchars(output, actualsize, end, (size_t)numPadWidth, ' ');
}
}
void PrintFloat0(bool e, bool f, bool a, bool uppercaseDigits, FormatterParams formatter,
char prepend, char *&output, size_t &actualsize, char *end)
{
int numwidth = 0;
if(a && formatter.Precision == FormatterParams::NoPrecision)
formatter.Precision = 0;
if(a)
numwidth = formatter.Precision + 1 + 5; // 0 plus precision plus 0xp+0
else if(e)
numwidth = formatter.Precision + 1 + 4; // 0 plus precision plus e+00
else if(f || formatter.Flags & AlternateForm)
numwidth = formatter.Precision + 1; // 0 plus precision
else
numwidth = 1;
// alternate form means . is included even if no digits after .
if(((e || f || a) && formatter.Precision > 0) || (formatter.Flags & AlternateForm))
numwidth++; // .
if(!e && !f && !a && (formatter.Flags & AlwaysDecimal))
{
numwidth += 2; // .0
}
// sign space
if(prepend)
numwidth++;
int padlen = 0;
if(formatter.Width != FormatterParams::NoWidth && formatter.Width > numwidth)
padlen = formatter.Width - numwidth;
if(formatter.Flags & PadZeroes)
{
if(a)
appendstring(output, actualsize, end, uppercaseDigits ? "0X" : "0x");
if(prepend)
addchar(output, actualsize, end, prepend);
addchars(output, actualsize, end, size_t(padlen), '0');
}
else if(padlen > 0 && (formatter.Flags & LeftJustify) == 0)
{
addchars(output, actualsize, end, size_t(padlen), ' ');
if(prepend)
addchar(output, actualsize, end, prepend);
if(a)
appendstring(output, actualsize, end, uppercaseDigits ? "0X" : "0x");
}
else
{
if(prepend)
addchar(output, actualsize, end, prepend);
if(a)
appendstring(output, actualsize, end, uppercaseDigits ? "0X" : "0x");
}
// print a .0 for all cases except non-alternate %g
if(e || f || formatter.Flags & AlternateForm)
{
addchar(output, actualsize, end, '0');
if(formatter.Precision > 0 || (formatter.Flags & AlternateForm))
addchar(output, actualsize, end, '.');
addchars(output, actualsize, end, size_t(formatter.Precision), '0');
if(e)
appendstring(output, actualsize, end, "e+00");
}
else if(a)
{
if(formatter.Precision == 0)
{
addchar(output, actualsize, end, '0');
}
else
{
appendstring(output, actualsize, end, "0.");
addchars(output, actualsize, end, size_t(formatter.Precision), '0');
}
}
else
{
addchar(output, actualsize, end, '0');
if(formatter.Flags & AlwaysDecimal)
{
addchar(output, actualsize, end, '.');
addchar(output, actualsize, end, '0');
}
}
if(a)
appendstring(output, actualsize, end, "p+0");
if(padlen > 0 && (formatter.Flags & LeftJustify))
{
addchars(output, actualsize, end, size_t(padlen), ' ');
}
}
void PrintFloat(double argd, FormatterParams &formatter, bool e, bool f, bool g, bool a,
bool uppercaseDigits, char *&output, size_t &actualsize, char *end)
{
// extract the pieces out of the double
uint64_t *arg64 = (uint64_t *)&argd;
bool signbit = (*arg64 & 0x8000000000000000) ? true : false;
uint64_t rawexp = (*arg64 & 0x7ff0000000000000) >> 52;
int exponent = int(rawexp) - 1023;
uint64_t mantissa = (*arg64 & 0x000fffffffffffff);
char prepend = '\0';
if(signbit)
prepend = '-';
else if(formatter.Flags & PrependPos)
prepend = '+';
else if(formatter.Flags & PrependSpace)
prepend = ' ';
// special-case handling of printing 0
if(rawexp == 0 && mantissa == 0)
{
PrintFloat0(e, f, a, uppercaseDigits, formatter, prepend, output, actualsize, end);
}
// handle 'special' values, inf and nan
else if(rawexp == 0x7ff)
{
if(mantissa == 0)
{
if(signbit)
appendstring(output, actualsize, end, uppercaseDigits ? "-INF" : "-inf");
else
appendstring(output, actualsize, end, uppercaseDigits ? "+INF" : "+inf");
}
else
{
appendstring(output, actualsize, end, uppercaseDigits ? "NAN" : "nan");
}
}
else if(a)
{
char digits[18] = {0};
int ndigits = 0;
for(int d = 12; mantissa && d >= 0; d--)
{
const uint64_t mask = 0xfULL << (d * 4);
const uint64_t digit = (mantissa & mask) >> (d * 4);
char c = char('0' + digit);
if(digit >= 10)
c = char((uppercaseDigits ? 'A' : 'a') + digit - 10);
digits[ndigits++] = c;
mantissa &= ~mask;
}
// if no precision is specified, drop trailing 0s and ensure we don't pad or trim
if(formatter.Precision == FormatterParams::NoPrecision)
{
while(ndigits > 0 && digits[ndigits - 1] == '0')
ndigits--;
formatter.Precision = ndigits;
}
// hold the carry bit because if it's needed we have no decimals and need to format 0x2p+E
// instead of 0x1.Mp+E
bool carry = false;
// see if we need to trim and round
if(ndigits > formatter.Precision)
{
int removedigs = ndigits - formatter.Precision;
// if we're removing all digits, just check the first to see if it should be
// rounded up or down
if(removedigs == ndigits)
{
ndigits = 0;
// all hex digits are above '8' in ascii order, so we can do just one comparison
carry = (digits[0] >= '8');
}
else
{
// remove the specified number of digits
ndigits -= removedigs;
// round up the last digit (continually rolling up if necessary)
// note this will look 'ahead' into the last removed digits at first
carry = true;
for(int i = ndigits - 1; i >= 0; i--)
{
// should we round up?
if(digits[i + 1] >= '8')
{
digits[i + 1] = 0;
// unless current digit is an f, we can just increment it and stop
if(digits[i] != 'f' && digits[i] != 'F')
{
if(digits[i] != '9')
digits[i]++;
else
digits[i] = uppercaseDigits ? 'A' : 'a';
carry = false;
break;
}
// continue (carry to next digit)
}
else
{
// didn't need to round up, everything's fine.
carry = false;
break;
}
// trim off a digit (was an f/F)
ndigits--;
continue;
}
}
}
if(digits[0] == '0' && !carry && ndigits == 0)
{
// if we rounded off to a 0.0, print it with special handling
PrintFloat0(e, f, a, uppercaseDigits, formatter, prepend, output, actualsize, end);
}
int padtrailing0s = formatter.Precision - ndigits;
{
int numwidth = 0;
// first calculate the width of the produced output, so we can calculate any padding
numwidth = 3; // 0x1
numwidth += ndigits; // post-decimal digits
if(ndigits > 0 || (formatter.Flags & AlternateForm) || padtrailing0s > 0)
numwidth++; // '.'
numwidth += padtrailing0s;
numwidth += 2; // 'p+' or 'p-'
if(exponent >= 0xff || exponent <= -0xff)
numwidth += 3;
else if(exponent >= 0xf || exponent <= -0xf)
numwidth += 2;
else
numwidth += 1;
if(prepend)
numwidth++; // +, - or ' '
int padlen = 0;
if(formatter.Width != FormatterParams::NoWidth && formatter.Width > numwidth)
padlen = formatter.Width - numwidth;
// pad with 0s or ' 's and insert the sign character
if(formatter.Flags & PadZeroes)
{
if(a)
appendstring(output, actualsize, end, uppercaseDigits ? "0X" : "0x");
if(prepend)
addchar(output, actualsize, end, prepend);
addchars(output, actualsize, end, size_t(padlen), '0');
}
else if(padlen > 0 && (formatter.Flags & LeftJustify) == 0)
{
addchars(output, actualsize, end, size_t(padlen), ' ');
if(prepend)
addchar(output, actualsize, end, prepend);
if(a)
appendstring(output, actualsize, end, uppercaseDigits ? "0X" : "0x");
}
else
{
if(prepend)
addchar(output, actualsize, end, prepend);
if(a)
appendstring(output, actualsize, end, uppercaseDigits ? "0X" : "0x");
}
if(carry)
addchar(output, actualsize, end, '2');
else
addchar(output, actualsize, end, '1');
// insert the decimals
if(ndigits > 0 || (formatter.Flags & AlternateForm) || padtrailing0s > 0)
addchar(output, actualsize, end, '.');
for(int i = 0; i < ndigits; i++)
addchar(output, actualsize, end, digits[i]);
// add the trailing 0s here
if(padtrailing0s > 0)
addchars(output, actualsize, end, size_t(padtrailing0s), '0');
// print the p+XXX exponential
addchar(output, actualsize, end, uppercaseDigits ? 'P' : 'p');
if(exponent >= 0)
addchar(output, actualsize, end, '+');
else
addchar(output, actualsize, end, '-');
int exponaccum = exponent >= 0 ? exponent : -exponent;
if(exponaccum >= 1000)
addchar(output, actualsize, end, '0' + char(exponaccum / 1000));
exponaccum %= 1000;
if(exponaccum >= 100)
addchar(output, actualsize, end, '0' + char(exponaccum / 100));
exponaccum %= 100;
if(exponaccum >= 10)
addchar(output, actualsize, end, '0' + char(exponaccum / 10));
exponaccum %= 10;
addchar(output, actualsize, end, '0' + char(exponaccum));
if(padlen > 0 && (formatter.Flags & LeftJustify))
{
addchars(output, actualsize, end, size_t(padlen), ' ');
}
}
}
else
{
// call out to grisu2 to generate digits + exponent
char digits[18] = {0};
int K = 0;
int ndigits = grisu2(mantissa, exponent, digits, K);
// this is the decimal exponent (ie. 0 if the digits are 1.2345)
int expon = K + ndigits - 1;
// number of digits after the decimal
int decdigits = ndigits - expon - 1;
// for exponential form, this is always 1 less than the total number of digits
if(e)
decdigits = RDCMAX(0, ndigits - 1);
// see if we need to trim some digits (for %g, the precision is the number of
// significant figures which is just ndigits at the moment, will be padded with 0s
// later).
if(decdigits > formatter.Precision || (g && ndigits > formatter.Precision))
{
int removedigs = decdigits - formatter.Precision;
if(g)
removedigs = RDCMAX(0, ndigits - formatter.Precision);
// if we're removing all digits, just check the first to see if it should be
// rounded up or down
if(removedigs == ndigits)
{
ndigits = 1;
if(digits[0] < '5')
{
digits[0] = '0';
}
else
{
// round up to "1" on the next exponent
digits[0] = '1';
expon++;
}
}
else if(removedigs > ndigits)
{
ndigits = 1;
digits[0] = '0';
expon = 0;
}
else
{
// remove the specified number of digits
ndigits -= removedigs;
// round up the last digit (continually rolling up if necessary)
// note this will look 'ahead' into the last removed digits at first
bool carry = true;
for(int i = ndigits - 1; i >= 0; i--)
{
// should we round up?
if(digits[i + 1] >= '5')
{
digits[i + 1] = 0;
// unless current digit is a 9, we can just increment it and stop
if(digits[i] < '9')
{
digits[i]++;
carry = false;
break;
}
// continue (carry to next digit)
}
else
{
// didn't need to round up, everything's fine.
carry = false;
break;
}
// trim off a digit (was a 9)
ndigits--;
continue;
}
// we only get here with carry still true if digits are 9999999
if(carry)
{
// round up to "1" on the next exponent
ndigits = 1;
digits[0] = '1';
expon++;
}
}
}
// recalculate decimal digits with new ndigits
decdigits = ndigits - expon - 1;
if(e)
decdigits = RDCMAX(0, ndigits - 1);
// number of trailing 0s we need to pad after decimal point determined by
// the precision
int padtrailing0s = formatter.Precision - RDCMAX(0, decdigits);
if(g)
{
// for %g if the exponent is too far out of range, we revert to exponential form
if(expon >= formatter.Precision || expon < -4)
{
e = true;
// if not alternate form, all trailing 0 digits are removed and there is no padding.
if((formatter.Flags & AlternateForm) == 0)
{
while(ndigits > 1 && digits[ndigits - 1] == '0')
ndigits--;
padtrailing0s = 0;
}
else
padtrailing0s = formatter.Precision - RDCMAX(0, ndigits);
}
else
{
padtrailing0s = formatter.Precision - RDCMAX(0, ndigits);
}
}
// exponential display
if(e)
{
int numwidth = 0;
// first calculate the width of the produced output, so we can calculate any padding
numwidth = ndigits; // digits
if(ndigits > 1 || (formatter.Flags & AlternateForm) || padtrailing0s > 0)
numwidth++; // '.'
numwidth += padtrailing0s;
numwidth += 2; // 'e+' or 'e-'
if(expon >= 1000 || expon <= -1000)
numwidth += 4;
else if(expon >= 100 || expon <= -100)
numwidth += 3;
else
numwidth += 2;
if(prepend)
numwidth++; // +, - or ' '
int padlen = 0;
if(formatter.Width != FormatterParams::NoWidth && formatter.Width > numwidth)
padlen = formatter.Width - numwidth;
// pad with 0s or ' 's and insert the sign character
if(formatter.Flags & PadZeroes)
{
if(prepend)
addchar(output, actualsize, end, prepend);
addchars(output, actualsize, end, size_t(padlen), '0');
}
else if(padlen > 0 && (formatter.Flags & LeftJustify) == 0)
{
addchars(output, actualsize, end, size_t(padlen), ' ');
if(prepend)
addchar(output, actualsize, end, prepend);
}
else
{
if(prepend)
addchar(output, actualsize, end, prepend);
}
// insert the mantissa as a 1.23456 decimal
addchar(output, actualsize, end, digits[0]);
if(ndigits > 1 || (formatter.Flags & AlternateForm) || padtrailing0s > 0)
addchar(output, actualsize, end, '.');
for(int i = 1; i < ndigits; i++)
addchar(output, actualsize, end, digits[i]);
// add the trailing 0s here
if(padtrailing0s > 0)
addchars(output, actualsize, end, size_t(padtrailing0s), '0');
// print the e-XXX exponential
addchar(output, actualsize, end, uppercaseDigits ? 'E' : 'e');
if(expon >= 0)
addchar(output, actualsize, end, '+');
else
addchar(output, actualsize, end, '-');
int exponaccum = expon >= 0 ? expon : -expon;
if(exponaccum >= 1000)
addchar(output, actualsize, end, '0' + char(exponaccum / 1000));
exponaccum %= 1000;
if(exponaccum >= 100)
addchar(output, actualsize, end, '0' + char(exponaccum / 100));
exponaccum %= 100;
addchar(output, actualsize, end, '0' + char(exponaccum / 10));
exponaccum %= 10;
addchar(output, actualsize, end, '0' + char(exponaccum));
if(padlen > 0 && (formatter.Flags & LeftJustify))
{
addchars(output, actualsize, end, size_t(padlen), ' ');
}
}
else if(digits[0] == '0' && ndigits == 1)
{
// if we rounded off to a 0.0, print it with special handling
PrintFloat0(e, f, a, uppercaseDigits, formatter, prepend, output, actualsize, end);
}
else
{
// we're printing as a normal decimal, e.g. 12345.6789
// if %g and not in alternate form, all 0s after the decimal point are stripped
if(g && (formatter.Flags & AlternateForm) == 0)
while(ndigits > 1 && ndigits - 1 > expon && digits[ndigits - 1] == '0')
ndigits--;