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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*****************************************************************/
/* OutString.cpp */
/*****************************************************************/
/* A simple, lightweight, character output stream, with very few
external dependancies (like sprintf ... ) */
/*
Date : 2/1/99 */
/*****************************************************************/
#include "stdafx.h"
#include "outstring.h"
/*****************************************************************/
// print out 'count' instances of the character 'c'
OutString& OutString::pad(size_t count, char c) {
if (cur+count > end)
Realloc(count);
memset(cur, c, count);
cur = cur + count;
return(*this);
}
/*****************************************************************/
// prints out a decimal representation
OutString& OutString::operator<<(double d) {
if (d == 0.0) {
*this << "0.0";
return *this;
}
if (d < 0) {
d = -d;
*this << '-';
}
// compute the exponent
int exponent = 0;
while (d > 10.0) {
d /= 10;
exponent++;
if (exponent > 500) { // avoids a possible infinite loop
*this << "INF";
return *this;
}
}
while (d < 1.0) {
d *= 10;
--exponent;
if (exponent < -500) { // avoids a possible infinite loop
*this << "0.0";
return *this;
}
}
// we now have a normalized d (between 1 and 10)
double delta = .5E-10;
d += delta; // round to the precision we are displaying
unsigned trailingZeros = 0;
for(unsigned i = 0; i < 10; i++) {
int digit = (int) d;
d = (d - digit) * 10; // ISSUE: does roundoff ever bite us here?
if (digit == 0) // defer printing traiing zeros
trailingZeros++;
else {
if (trailingZeros > 0) {
this->pad(trailingZeros, '0');
trailingZeros = 0;
}
*this << (char) ('0' + digit);
}
if (i == 0)
*this << '.';
}
if (exponent != 0) {
*this << 'E';
*this << exponent;
}
return(*this);
}
/*****************************************************************/
// prints out a decimal representation
OutString& OutString::dec(int i, size_t minWidth) {
char buff[12]; // big enough for any number (10 digits, - sign, null term)
char* ptr = &buff[11];
*ptr = 0;
unsigned val = i;
if (i < 0)
val = -i; // note this happens to also work for minint!
for(;;) {
if (val < 10) {
*--ptr = '0' + val;
break;
}
*--ptr = '0' + (val % 10);
val = val / 10;
}
if (i < 0)
*--ptr = '-';
size_t len = &buff[11] - ptr; // length of string
if (len < minWidth)
pad(minWidth-len, ' ');
*this << ptr;
return(*this);
}
/*****************************************************************/
OutString& OutString::hex(unsigned __int64 i, int minWidth, unsigned flags) {
unsigned hi = unsigned(i >> 32);
unsigned low = unsigned(i);
if (hi != 0) {
minWidth -= 8;
hex(hi, minWidth, flags); // print upper bits
flags = zeroFill;
minWidth = 8;
}
return hex(low, minWidth, flags); // print lower bits
}
/*****************************************************************/
OutString& OutString::hex(unsigned i, int minWidth, unsigned flags) {
char buff[12]; // big enough for any number
char* ptr = &buff[11];
*ptr = 0;
static const char digits[] = "0123456789ABCDEF";
for(;;) {
if (i < 16) {
*--ptr = digits[i];
break;
}
*--ptr = digits[(i % 16)];
i = i / 16;
}
size_t len = &buff[11] - ptr; // length of string
if (flags & put0x) {
if (flags & zeroFill)
*this << "0x";
else
*--ptr = 'x', *--ptr = '0';
len += 2;
}
if (len < (size_t)minWidth)
pad(minWidth-len, (flags & zeroFill) ? '0' : ' ');
*this << ptr;
return(*this);
}
/*****************************************************************/
void OutString::Realloc(size_t neededSpace) {
size_t oldSize = cur-start;
size_t newSize = (oldSize + neededSpace) * 3 / 2 + 32;
char* oldBuff = start;
start = new char[newSize+1];
memcpy(start, oldBuff, oldSize);
cur = &start[oldSize];
end = &start[newSize];
delete [] oldBuff;
}
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