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/***
*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);
}
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