1/* vsprintf with automatic memory allocation. 2 Copyright (C) 2002-2004, 2007 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) || __STRICT_ANSI__ 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 41extern "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 72extern char * asnprintf (char *resultbuf, size_t *lengthp, const char *format, ...) 73 __attribute__ ((__format__ (__printf__, 3, 4))); 74extern 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 */ 82