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1 office 1 /* Class autosprintf - formatted output to an ostream.
2 Copyright (C) 2002, 2013, 2015-2016 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
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) 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
13 GNU Lesser General Public License for more details.
14  
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17  
18 /* Tell glibc's <stdio.h> to provide a prototype for vasprintf().
19 This must come before <config.h> because <config.h> may include
20 <features.h>, and once <features.h> has been included, it's too late. */
21 #ifndef _GNU_SOURCE
22 # define _GNU_SOURCE 1
23 #endif
24  
25 /* Specification. */
26 #include "autosprintf.h"
27  
28 #include <stdarg.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include "lib-asprintf.h"
32  
33 /* std::swap() is in <utility> since C++11. */
34 #if __cplusplus >= 201103L
35 # include <utility>
36 #else
37 # include <algorithm>
38 #endif
39  
40 namespace gnu
41 {
42  
43 /* Constructor: takes a format string and the printf arguments. */
44 autosprintf::autosprintf (const char *format, ...)
45 {
46 va_list args;
47 va_start (args, format);
48 if (vasprintf (&str, format, args) < 0)
49 str = NULL;
50 va_end (args);
51 }
52  
53 /* Copy constructor. Necessary because the destructor is nontrivial. */
54 autosprintf::autosprintf (const autosprintf& src)
55 {
56 str = (src.str != NULL ? strdup (src.str) : NULL);
57 }
58  
59 /* Copy constructor. Necessary because the destructor is nontrivial. */
60 autosprintf& autosprintf::operator = (autosprintf copy)
61 {
62 std::swap (copy.str, this->str);
63 return *this;
64 }
65  
66 /* Destructor: frees the temporarily allocated string. */
67 autosprintf::~autosprintf ()
68 {
69 free (str);
70 }
71  
72 /* Conversion to string. */
73 autosprintf::operator char * () const
74 {
75 if (str != NULL)
76 {
77 size_t length = strlen (str) + 1;
78 char *copy = new char[length];
79 memcpy (copy, str, length);
80 return copy;
81 }
82 else
83 return NULL;
84 }
85 autosprintf::operator std::string () const
86 {
87 return std::string (str ? str : "(error in autosprintf)");
88 }
89 }