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comparison lib/vasnprintf.h @ 265:68fbca173508 2.6

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author lost
date Tue, 22 Dec 2009 05:31:23 +0000
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264:61d1db1dfe2a 265:68fbca173508
1 /* vsprintf with automatic memory allocation.
2 Copyright (C) 2002-2004, 2007-2008 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 General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 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 General Public License for more details.
13
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
17
18 #ifndef _VASNPRINTF_H
19 #define _VASNPRINTF_H
20
21 /* Get va_list. */
22 #include <stdarg.h>
23
24 /* Get size_t. */
25 #include <stddef.h>
26
27 #ifndef __attribute__
28 /* This feature is available in gcc versions 2.5 and later. */
29 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
30 # define __attribute__(Spec) /* empty */
31 # endif
32 /* The __-protected variants of `format' and `printf' attributes
33 are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */
34 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
35 # define __format__ format
36 # define __printf__ printf
37 # endif
38 #endif
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /* Write formatted output to a string dynamically allocated with malloc().
45 You can pass a preallocated buffer for the result in RESULTBUF and its
46 size in *LENGTHP; otherwise you pass RESULTBUF = NULL.
47 If successful, return the address of the string (this may be = RESULTBUF
48 if no dynamic memory allocation was necessary) and set *LENGTHP to the
49 number of resulting bytes, excluding the trailing NUL. Upon error, set
50 errno and return NULL.
51
52 When dynamic memory allocation occurs, the preallocated buffer is left
53 alone (with possibly modified contents). This makes it possible to use
54 a statically allocated or stack-allocated buffer, like this:
55
56 char buf[100];
57 size_t len = sizeof (buf);
58 char *output = vasnprintf (buf, &len, format, args);
59 if (output == NULL)
60 ... error handling ...;
61 else
62 {
63 ... use the output string ...;
64 if (output != buf)
65 free (output);
66 }
67 */
68 #if REPLACE_VASNPRINTF
69 # define asnprintf rpl_asnprintf
70 # define vasnprintf rpl_vasnprintf
71 #endif
72 extern char * asnprintf (char *resultbuf, size_t *lengthp, const char *format, ...)
73 __attribute__ ((__format__ (__printf__, 3, 4)));
74 extern char * vasnprintf (char *resultbuf, size_t *lengthp, const char *format, va_list args)
75 __attribute__ ((__format__ (__printf__, 3, 0)));
76
77 #ifdef __cplusplus
78 }
79 #endif
80
81 #endif /* _VASNPRINTF_H */