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| 1 | +/* Class autosprintf - formatted output to an ostream. |
| 2 | + Copyright (C) 2002, 2012-2016 Free Software Foundation, Inc. |
| 3 | +
|
| 4 | + This program is free software: you can redistribute it and/or modify |
| 5 | + it under the terms of the GNU Lesser General Public License as published by |
| 6 | + the Free Software Foundation; either version 2.1 of the License, or |
| 7 | + (at your option) any later version. |
| 8 | +
|
| 9 | + This program is distributed in the hope that it will be useful, |
| 10 | + but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | + GNU Lesser General Public License for more details. |
| 13 | +
|
| 14 | + You should have received a copy of the GNU Lesser General Public License |
| 15 | + along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 16 | + |
| 17 | +#ifndef _AUTOSPRINTF_H |
| 18 | +#define _AUTOSPRINTF_H |
| 19 | + |
| 20 | +/* This feature is available in gcc versions 2.5 and later. */ |
| 21 | +#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__ |
| 22 | +# define _AUTOSPRINTF_ATTRIBUTE_FORMAT() /* empty */ |
| 23 | +#else |
| 24 | +/* The __-protected variants of 'format' and 'printf' attributes |
| 25 | + are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */ |
| 26 | +# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) |
| 27 | +# define _AUTOSPRINTF_ATTRIBUTE_FORMAT() \ |
| 28 | + __attribute__ ((__format__ (__printf__, 2, 3))) |
| 29 | +# else |
| 30 | +# define _AUTOSPRINTF_ATTRIBUTE_FORMAT() \ |
| 31 | + __attribute__ ((format (printf, 2, 3))) |
| 32 | +# endif |
| 33 | +#endif |
| 34 | + |
| 35 | +#include <string> |
| 36 | +#include <iostream> |
| 37 | + |
| 38 | +namespace gnu |
| 39 | +{ |
| 40 | + /* A temporary object, usually allocated on the stack, representing |
| 41 | + the result of an asprintf() call. */ |
| 42 | + class autosprintf |
| 43 | + { |
| 44 | + public: |
| 45 | + /* Constructor: takes a format string and the printf arguments. */ |
| 46 | + autosprintf (const char *format, ...) |
| 47 | + _AUTOSPRINTF_ATTRIBUTE_FORMAT(); |
| 48 | + /* Copy constructor. */ |
| 49 | + autosprintf (const autosprintf& src); |
| 50 | + autosprintf& operator = (autosprintf copy); |
| 51 | + /* Destructor: frees the temporarily allocated string. */ |
| 52 | + ~autosprintf (); |
| 53 | + /* Conversion to string. */ |
| 54 | + operator char * () const; |
| 55 | + operator std::string () const; |
| 56 | + /* Output to an ostream. */ |
| 57 | + friend inline std::ostream& operator<< (std::ostream& stream, const autosprintf& tmp) |
| 58 | + { |
| 59 | + stream << (tmp.str ? tmp.str : "(error in autosprintf)"); |
| 60 | + return stream; |
| 61 | + } |
| 62 | + private: |
| 63 | + char *str; |
| 64 | + }; |
| 65 | +} |
| 66 | + |
| 67 | +#endif /* _AUTOSPRINTF_H */ |
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