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c4b681fd | 1 | /* vsprintf with automatic memory allocation. |
5e69ceb7 | 2 | Copyright (C) 2002-2004, 2007-2014 Free Software Foundation, Inc. |
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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, 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 Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public License along | |
005de2e8 | 15 | with this program; if not, see <http://www.gnu.org/licenses/>. */ |
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16 | |
17 | #ifndef _VASNPRINTF_H | |
18 | #define _VASNPRINTF_H | |
19 | ||
20 | /* Get va_list. */ | |
21 | #include <stdarg.h> | |
22 | ||
23 | /* Get size_t. */ | |
24 | #include <stddef.h> | |
25 | ||
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26 | /* The __attribute__ feature is available in gcc versions 2.5 and later. |
27 | The __-protected variants of the attributes 'format' and 'printf' are | |
28 | accepted by gcc versions 2.6.4 (effectively 2.7) and later. | |
dd36ce77 | 29 | We enable _GL_ATTRIBUTE_FORMAT only if these are supported too, because |
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30 | gnulib and libintl do '#define printf __printf__' when they override |
31 | the 'printf' function. */ | |
dd36ce77 MW |
32 | #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7) |
33 | # define _GL_ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec)) | |
34 | #else | |
35 | # define _GL_ATTRIBUTE_FORMAT(spec) /* empty */ | |
c4b681fd LC |
36 | #endif |
37 | ||
38 | #ifdef __cplusplus | |
39 | extern "C" { | |
40 | #endif | |
41 | ||
42 | /* Write formatted output to a string dynamically allocated with malloc(). | |
43 | You can pass a preallocated buffer for the result in RESULTBUF and its | |
44 | size in *LENGTHP; otherwise you pass RESULTBUF = NULL. | |
45 | If successful, return the address of the string (this may be = RESULTBUF | |
46 | if no dynamic memory allocation was necessary) and set *LENGTHP to the | |
47 | number of resulting bytes, excluding the trailing NUL. Upon error, set | |
48 | errno and return NULL. | |
49 | ||
50 | When dynamic memory allocation occurs, the preallocated buffer is left | |
51 | alone (with possibly modified contents). This makes it possible to use | |
52 | a statically allocated or stack-allocated buffer, like this: | |
53 | ||
54 | char buf[100]; | |
55 | size_t len = sizeof (buf); | |
56 | char *output = vasnprintf (buf, &len, format, args); | |
57 | if (output == NULL) | |
58 | ... error handling ...; | |
59 | else | |
60 | { | |
61 | ... use the output string ...; | |
62 | if (output != buf) | |
63 | free (output); | |
64 | } | |
65 | */ | |
66 | #if REPLACE_VASNPRINTF | |
67 | # define asnprintf rpl_asnprintf | |
68 | # define vasnprintf rpl_vasnprintf | |
69 | #endif | |
70 | extern char * asnprintf (char *resultbuf, size_t *lengthp, const char *format, ...) | |
dd36ce77 | 71 | _GL_ATTRIBUTE_FORMAT ((__printf__, 3, 4)); |
c4b681fd | 72 | extern char * vasnprintf (char *resultbuf, size_t *lengthp, const char *format, va_list args) |
dd36ce77 | 73 | _GL_ATTRIBUTE_FORMAT ((__printf__, 3, 0)); |
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74 | |
75 | #ifdef __cplusplus | |
76 | } | |
77 | #endif | |
78 | ||
79 | #endif /* _VASNPRINTF_H */ |