| /* Class autosprintf - formatted output to an ostream. |
| Copyright (C) 2002, 2013, 2015, 2018 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/>. */ |
| |
| /* Tell glibc's <stdio.h> to provide a prototype for vasprintf(). |
| This must come before <config.h> because <config.h> may include |
| <features.h>, and once <features.h> has been included, it's too late. */ |
| #ifndef _GNU_SOURCE |
| # define _GNU_SOURCE 1 |
| #endif |
| |
| /* 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)"); |
| } |
| } |