1 /* Class autosprintf - formatted output to an ostream. 2 Copyright (C) 2002 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2002. 4 5 This program is free software; you can redistribute it and/or modify it 6 under the terms of the GNU Library General Public License as published 7 by the Free Software Foundation; either version 2, or (at your option) 8 any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Library General Public License for more details. 14 15 You should have received a copy of the GNU Library General Public 16 License along with this program; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 18 USA. */ 19 20 /* Tell glibc's <stdio.h> to provide a prototype for vasprintf(). 21 This must come before <config.h> because <config.h> may include 22 <features.h>, and once <features.h> has been included, it's too late. */ 23 #ifndef _GNU_SOURCE 24 # define _GNU_SOURCE 1 25 #endif 26 27 /* Specification. */ 28 #include "autosprintf.h" 29 30 #include <stdarg.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include "lib-asprintf.h" 34 35 namespace gnu 36 { 37 38 /* Constructor: takes a format string and the printf arguments. */ autosprintf(const char * format,...)39 autosprintf::autosprintf (const char *format, ...) 40 { 41 va_list args; 42 va_start (args, format); 43 if (vasprintf (&str, format, args) < 0) 44 str = NULL; 45 va_end (args); 46 } 47 48 /* Copy constructor. Necessary because the destructor is nontrivial. */ autosprintf(const autosprintf & src)49 autosprintf::autosprintf (const autosprintf& src) 50 { 51 str = (src.str != NULL ? strdup (src.str) : NULL); 52 } 53 54 /* Destructor: frees the temporarily allocated string. */ ~autosprintf()55 autosprintf::~autosprintf () 56 { 57 free (str); 58 } 59 60 /* Conversion to string. */ operator char*() const61 autosprintf::operator char * () const 62 { 63 if (str != NULL) 64 { 65 size_t length = strlen (str) + 1; 66 char *copy = new char[length]; 67 memcpy (copy, str, length); 68 return copy; 69 } 70 else 71 return NULL; 72 } operator std::string() const73 autosprintf::operator std::string () const 74 { 75 return std::string (str ? str : "(error in autosprintf)"); 76 } 77 } 78