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/** @file
* @brief Convert types to std::string
*/
/* Copyright (C) 2009,2012,2015,2017 Olly Betts
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include "str.h"
#include "omassert.h"
#include <cstdio> // For snprintf() or sprintf().
#include <cstdlib> // For abort().
#include <string>
#include <type_traits>
using namespace std;
// Much faster than snprintf() - also less generated code!
template<class T>
static inline string
tostring_unsigned(T value)
{
static_assert(std::is_unsigned<T>::value, "Unsigned type required");
// Special case single digit positive numbers.
// FIXME: is this actually worthwhile?
if (value < 10) return string(1, '0' + char(value));
char buf[(sizeof(T) * 5 + 1) / 2];
char * p = buf + sizeof(buf);
do {
AssertRel(p,>,buf);
char ch = static_cast<char>(value % 10);
value /= 10;
*(--p) = ch + '0';
} while (value);
return string(p, buf + sizeof(buf) - p);
}
template<class T>
static inline string
tostring(T value)
{
// Special case single digit positive numbers.
// FIXME: is this actually worthwhile?
if (value < 10 && value >= 0) return string(1, '0' + char(value));
bool negative = (value < 0);
typedef typename std::make_unsigned<T>::type unsigned_type;
unsigned_type val(value);
if (negative) {
val = -val;
}
char buf[(sizeof(unsigned_type) * 5 + 1) / 2 + 1];
char * p = buf + sizeof(buf);
do {
AssertRel(p,>,buf);
char ch = static_cast<char>(val % 10);
val /= 10;
*(--p) = ch + '0';
} while (val);
if (negative) {
AssertRel(p,>,buf);
*--p = '-';
}
return string(p, buf + sizeof(buf) - p);
}
namespace Xapian {
namespace Internal {
string
str(int value)
{
return tostring(value);
}
string
str(unsigned int value)
{
return tostring_unsigned(value);
}
string
str(long value)
{
return tostring(value);
}
string
str(unsigned long value)
{
return tostring_unsigned(value);
}
string
str(long long value)
{
return tostring(value);
}
string
str(unsigned long long value)
{
return tostring_unsigned(value);
}
template<class T>
static inline string
format(const char * fmt, T value)
{
char buf[128];
#ifdef SNPRINTF
// If -1 is returned (as pre-ISO snprintf does if the buffer is too small,
// it will be cast to > sizeof(buf) and handled appropriately.
size_t size = SNPRINTF(buf, sizeof(buf), fmt, value);
AssertRel(size,<=,sizeof(buf));
if (size > sizeof(buf)) size = sizeof(buf);
#else
size_t size = sprintf(buf, fmt, value);
// Buffer overflow.
if (size >= sizeof(buf)) abort();
#endif
return string(buf, size);
}
string
str(double value)
{
return format("%.20g", value);
}
string
str(const void * value)
{
return format("%p", value);
}
}
}
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