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/* Class autosprintf - formatted output to an ostream.
Copyright (C) 2002, 2013, 2015, 2018, 2021 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "autosprintf.h"
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
/* std::swap() is in <utility> since C++11. */
#if __cplusplus >= 201103L
# include <utility>
#else
# include <algorithm>
#endif
/* This include must come last, since it contains overrides of functions that
the system may provide (namely, vasprintf). */
#include "lib-asprintf.h"
namespace gnu
{
/* Constructor: takes a format string and the printf arguments. */
autosprintf::autosprintf (const char *format, ...)
{
va_list args;
va_start (args, format);
if (vasprintf (&str, format, args) < 0)
str = NULL;
va_end (args);
}
/* Copy constructor. Necessary because the destructor is nontrivial. */
autosprintf::autosprintf (const autosprintf& src)
{
str = (src.str != NULL ? strdup (src.str) : NULL);
}
/* Assignment operator. Necessary because the destructor is nontrivial. */
autosprintf& autosprintf::operator = (autosprintf temporary)
{
/* Copy-and-swap idiom.
See https://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom */
std::swap (temporary.str, this->str);
return *this;
}
/* Destructor: frees the temporarily allocated string. */
autosprintf::~autosprintf ()
{
free (str);
}
/* Conversion to string. */
autosprintf::operator char * () const
{
if (str != NULL)
{
size_t length = strlen (str) + 1;
char *copy = new char[length];
memcpy (copy, str, length);
return copy;
}
else
return NULL;
}
autosprintf::operator std::string () const
{
return std::string (str ? str : "(error in autosprintf)");
}
}
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