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snprintx.h
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snprintx.h
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/*
* snprintx: snprintf-like functions for easy formatting strings
* Copyright (C) 2009 Seong-Kook Shin <cinsky@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef SNPRINTX__
#include <sys/types.h>
#ifndef __GNUC__
#define ATTR(x)
#else
#define ATTR __attribute__
#endif
/*
* snprintx: format string into the buffer
*
* Similar to `snprintf', this function formats the given FORMAT string
* except that it updates the argument BUF and SIZE accordingly.
*
* When the buffer is enough large to hold the result, *BUF points the
* end of the string (e.g. **BUF points the null character), *SIZE is
* the number of the characters, and it returns zero.
*
* When the buffer is not enough, *BUF points the right next to the
* end of the buffer (sizeof(*BUF) + *SIZE), *SIZE is -1, and it
* returns the number of characters which whould be generated for the
* given input, excluding the trailing null.
*/
extern int snprintx(char **buf, ssize_t *size, const char *format, ...)
ATTR ((format (printf, 3, 4)));
/*
* This is the equivalent of `snprintx' with the variable argument
* list specified directly as for `vprintf'.
*/
extern int vsnprintx(char **buf, ssize_t *size, const char *format, va_list ap)
ATTR ((format (printf, 3, 0)));
#endif /* SNPRINTX__ */