/***
*vswprint.c - print formatted data into a string from var arg list
*
*	Copyright (c) 1985-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
*	defines vswprintf() and _vsnwprintf() - print formatted output to
*	a string, get the data from an argument ptr instead of explicit
*	arguments.
*
*Revision History:
*	05-16-92  KRS	Created from vsprintf.c.
*       02-18-93  SRW   Make FILE a local and remove lock usage.
*
*******************************************************************************/

#include <cruntime.h>
#include <stdio.h>
#include <wchar.h>
#include <assert.h>
#include <stdarg.h>
#include <internal.h>
#include <limits.h>
#include <os2dll.h>

#define MAXSTR INT_MAX


/***
#ifndef _COUNT_
*int vswprintf(string, format, ap) - print formatted data to string from arg ptr
#else
*int _vsnwprintf(string, format, ap) - print formatted data to string from arg ptr
#endif
*
*Purpose:
*	Prints formatted data, but to a string and gets data from an argument
*	pointer.
*	Sets up a FILE so file i/o operations can be used, make string look
*	like a huge buffer to it, but _flsbuf will refuse to flush it if it
*	fills up. Appends '\0' to make it a true string.
*
*	Allocate the 'fake' _iob[] entryit statically instead of on
*	the stack so that other routines can assume that _iob[] entries are in
*	are in DGROUP and, thus, are near.
*
#ifdef _COUNT_
*	The _vsnwprintf() flavor takes a count argument that is
*	the max number of bytes that should be written to the
*	user's buffer.
#endif
*
*	Multi-thread: (1) Since there is no stream, this routine must never try
*	to get the stream lock (i.e., there is no stream lock either).	(2)
*	Also, since there is only one staticly allocated 'fake' iob, we must
*	lock/unlock to prevent collisions.
*
*Entry:
*	wchar_t *string - place to put destination string
#ifdef _COUNT_
*	size_t count - max number of bytes to put in buffer
#endif
*	wchar_t *format - format string, describes format of data
*	va_list ap - varargs argument pointer
*
*Exit:
*	returns number of wide characters in string
*
*Exceptions:
*
*******************************************************************************/

#ifndef _COUNT_

int _CALLTYPE1 vswprintf (
	wchar_t *string,
	const wchar_t *format,
	va_list ap
	)
#else

int _CALLTYPE1 _vsnwprintf (
	wchar_t *string,
	size_t count,
	const wchar_t *format,
	va_list ap
	)
#endif

{
        FILE str;
	REG1 FILE *outfile = &str;
	REG2 int retval;

	assert(string != NULL);
	assert(format != NULL);

	outfile->_flag = _IOWRT|_IOSTRG;
	outfile->_ptr = outfile->_base = (char *) string;
#ifndef _COUNT_
	outfile->_cnt = MAXSTR;
#else
	outfile->_cnt = count*sizeof(wchar_t);
#endif

	retval = _woutput(outfile,format,ap );
	_putc_lk('\0',outfile);     /* no-lock version */
	_putc_lk('\0',outfile);     /* 2nd byte for wide char version */

	return(retval);
}