| 1 | /* vsprintf with automatic memory allocation.
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| 2 | Copyright (C) 2002-2004 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software; you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 2, or (at your option)
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| 7 | any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License along
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| 15 | with this program; if not, write to the Free Software Foundation,
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| 16 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 17 |
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| 18 | #ifndef _VASNPRINTF_H
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| 19 | #define _VASNPRINTF_H
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| 20 |
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| 21 | /* Get va_list. */
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| 22 | #include <stdarg.h>
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| 23 |
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| 24 | /* Get size_t. */
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| 25 | #include <stddef.h>
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| 26 |
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| 27 | #ifndef __attribute__
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| 28 | /* This feature is available in gcc versions 2.5 and later. */
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| 29 | # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
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| 30 | # define __attribute__(Spec) /* empty */
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| 31 | # endif
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| 32 | /* The __-protected variants of `format' and `printf' attributes
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| 33 | are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */
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| 34 | # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
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| 35 | # define __format__ format
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| 36 | # define __printf__ printf
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| 37 | # endif
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| 38 | #endif
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| 39 |
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| 40 | #ifdef __cplusplus
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| 41 | extern "C" {
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| 42 | #endif
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| 43 |
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| 44 | /* Write formatted output to a string dynamically allocated with malloc().
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| 45 | You can pass a preallocated buffer for the result in RESULTBUF and its
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| 46 | size in *LENGTHP; otherwise you pass RESULTBUF = NULL.
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| 47 | If successful, return the address of the string (this may be = RESULTBUF
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| 48 | if no dynamic memory allocation was necessary) and set *LENGTHP to the
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| 49 | number of resulting bytes, excluding the trailing NUL. Upon error, set
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| 50 | errno and return NULL.
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| 51 |
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| 52 | When dynamic memory allocation occurs, the preallocated buffer is left
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| 53 | alone (with possibly modified contents). This makes it possible to use
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| 54 | a statically allocated or stack-allocated buffer, like this:
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| 55 |
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| 56 | char buf[100];
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| 57 | size_t len = sizeof (buf);
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| 58 | char *output = vasnprintf (buf, &len, format, args);
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| 59 | if (output == NULL)
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| 60 | ... error handling ...;
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| 61 | else
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| 62 | {
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| 63 | ... use the output string ...;
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| 64 | if (output != buf)
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| 65 | free (output);
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| 66 | }
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| 67 | */
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| 68 | extern char * asnprintf (char *resultbuf, size_t *lengthp, const char *format, ...)
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| 69 | __attribute__ ((__format__ (__printf__, 3, 4)));
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| 70 | extern char * vasnprintf (char *resultbuf, size_t *lengthp, const char *format, va_list args)
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| 71 | __attribute__ ((__format__ (__printf__, 3, 0)));
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| 72 |
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| 73 | #ifdef __cplusplus
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| 74 | }
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| 75 | #endif
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| 76 |
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| 77 | #endif /* _VASNPRINTF_H */
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