1
/* vsprintf with automatic memory allocation.
2
Copyright (C) 2002-2004 Free Software Foundation, Inc.
4
This program is free software; you can redistribute it and/or modify it
5
under the terms of the GNU Library General Public License as published
6
by the Free Software Foundation; either version 2, or (at your option)
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 GNU
12
Library General Public License for more details.
14
You should have received a copy of the GNU Library General Public
15
License along with this program; if not, write to the Free Software
16
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
29
/* This feature is available in gcc versions 2.5 and later. */
30
# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
31
# define __attribute__(Spec) /* empty */
33
/* The __-protected variants of `format' and `printf' attributes
34
are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */
35
# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
36
# define __format__ format
37
# define __printf__ printf
45
/* Write formatted output to a string dynamically allocated with malloc().
46
You can pass a preallocated buffer for the result in RESULTBUF and its
47
size in *LENGTHP; otherwise you pass RESULTBUF = NULL.
48
If successful, return the address of the string (this may be = RESULTBUF
49
if no dynamic memory allocation was necessary) and set *LENGTHP to the
50
number of resulting bytes, excluding the trailing NUL. Upon error, set
51
errno and return NULL.
53
When dynamic memory allocation occurs, the preallocated buffer is left
54
alone (with possibly modified contents). This makes it possible to use
55
a statically allocated or stack-allocated buffer, like this:
58
size_t len = sizeof (buf);
59
char *output = vasnprintf (buf, &len, format, args);
61
... error handling ...;
64
... use the output string ...;
69
extern char * asnprintf (char *resultbuf, size_t *lengthp, const char *format, ...)
70
__attribute__ ((__format__ (__printf__, 3, 4)));
71
extern char * vasnprintf (char *resultbuf, size_t *lengthp, const char *format, va_list args)
72
__attribute__ ((__format__ (__printf__, 3, 0)));
78
#endif /* _VASNPRINTF_H */