reactos/sdk/lib/crt/printf/_sxprintf.c

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/*
* COPYRIGHT: GNU GPL, see COPYING in the top level directory
* PROJECT: ReactOS crt library
* FILE: lib/sdk/crt/printf/_sxprintf.c
* PURPOSE: Implementation of swprintf
* PROGRAMMER: Timo Kreuzer
*/
#include <stdio.h>
#include <stdarg.h>
#include <limits.h>
#include <tchar.h>
#if IS_SECAPI
#include <internal/safecrt.h>
#endif
#ifdef _UNICODE
#define _tstreamout wstreamout
#else
#define _tstreamout streamout
#endif
#define min(a,b) (((a) < (b)) ? (a) : (b))
int __cdecl _tstreamout(FILE *stream, const TCHAR *format, va_list argptr);
int
#if defined(USER32_WSPRINTF) && defined(_M_IX86)
__stdcall
#else
__cdecl
#endif
_sxprintf(
TCHAR *buffer,
#if IS_SECAPI
size_t sizeOfBuffer,
#endif
#if USE_COUNT
size_t count,
#endif
const TCHAR *format,
#if USE_VARARGS
va_list argptr)
#else
...)
#endif
{
#if !USE_COUNT
const size_t count = INT_MAX;
#endif
#if !IS_SECAPI
const size_t sizeOfBuffer = count;
#endif
#if !USE_VARARGS
va_list argptr;
#endif
int result;
FILE stream;
#if IS_SECAPI
/* Validate parameters */
if (MSVCRT_CHECK_PMT(((buffer == NULL) || (format == NULL) || (sizeOfBuffer <= 0))))
{
errno = EINVAL;
return -1;
}
/* Limit output to count + 1 characters */
if (count != -1)
sizeOfBuffer = min(sizeOfBuffer, count + 1);
#endif
/* Setup the FILE structure */
stream._base = (char*)buffer;
stream._ptr = stream._base;
stream._charbuf = 0;
stream._cnt = (int)(sizeOfBuffer * sizeof(TCHAR));
stream._bufsiz = 0;
stream._flag = _IOSTRG | _IOWRT;
stream._tmpfname = 0;
#if !USE_VARARGS
va_start(argptr, format);
#endif
result = _tstreamout(&stream, format, argptr);
#if !USE_VARARGS
va_end(argptr);
#endif
#if IS_SECAPI
/* Check for failure or unterminated string */
if ((result < 0) || (result == sizeOfBuffer))
{
/* Null-terminate the buffer at the end */
buffer[sizeOfBuffer-1] = _T('\0');
/* Check if we can truncate */
if (count != _TRUNCATE)
{
/* We can't, invoke invalid parameter handler */
MSVCRT_INVALID_PMT("Buffer is too small", ERANGE);
/* If we came back, set the buffer to an empty string */
*buffer = 0;
}
/* Return failure */
return -1;
}
/* Null-terminate the buffer after the string */
buffer[result] = _T('\0');
#else
/* Only zero terminate if there is enough space left */
if ((stream._cnt >= sizeof(TCHAR)) && (stream._ptr))
*(TCHAR*)stream._ptr = _T('\0');
#endif
return result;
}