repos_ecs/其他2015后/日志库/log4c_Ver.1.2.4/Log4C/sd/sprintf.c

static const char version[] = "$Id$";

/* 
* Copyright 2001-2003, Meiosys (www.meiosys.com). All rights reserved.
*
* See the COPYING file for the terms of usage and distribution.
*/

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sd/sprintf.h>
#include <sd/malloc.h>
#include <sd/sd_xplatform.h>

/******************************************************************************/
extern char* sd_sprintf(const char* a_fmt, ...)
{
	char*	buffer;
	va_list	args;

	va_start(args, a_fmt);
	buffer = sd_vsprintf(a_fmt, args);
	va_end(args);

	return buffer;
}

/******************************************************************************/
extern char* sd_vsprintf(const char* a_fmt, va_list a_args)
{
	int		size	= 10240;
	char*	buffer  = sd_calloc(size, sizeof(char));
	va_list ap;
	int n;

	while (1) {
		va_copy(ap, a_args);
		n = vsnprintf(buffer, size, a_fmt, ap);
		va_end(ap);

		/* If that worked, return */
		if (n > -1 && n < size)
			return buffer;

		/* Else try again with more space. */
		if (n > -1)     /* ISO/IEC 9899:1999 */
			size = n + 1;    
		else            /* twice the old size */
			size *= 2;      

		buffer = sd_realloc(buffer, size);
	}
}

#if defined(__osf__)
#	ifndef snprintf
#		include "sprintf.osf.c"
#	endif
#endif