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 <https://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 /* Assignment operator. */ 51 autosprintf& operator = (autosprintf temporary); 52 /* Destructor: frees the temporarily allocated string. */ 53 ~autosprintf (); 54 /* Conversion to string. */ 55 operator char * () const; 56 operator std::string () const; 57 /* Output to an ostream. */ 58 friend inline std::ostream& operator<< (std::ostream& stream, const autosprintf& tmp) 59 { 60 stream << (tmp.str ? tmp.str : "(error in autosprintf)"); 61 return stream; 62 } 63 private: 64 char *str; 65 }; 66 } 67 68 #endif /* _AUTOSPRINTF_H */ 69