mirror of
https://github.com/reactos/reactos.git
synced 2024-08-28 22:28:36 +00:00
50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
![]() |
/*
|
||
|
* Handy secure string adapter functions for mbedTLS,
|
||
|
* converting from `StringCchVPrintfEx` to `_vsnprintf_s`.
|
||
|
*
|
||
|
* Copyright 2015 Ismael Ferreras Morezuelas <swyterzone+ros@gmail.com>
|
||
|
*
|
||
|
* This library is free software; you can redistribute it and/or
|
||
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
* License as published by the Free Software Foundation; either
|
||
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
*
|
||
|
* This library 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
|
||
|
* Lesser General Public License for more details.
|
||
|
*
|
||
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
* License along with this library; if not, write to the Free Software
|
||
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
|
||
|
*/
|
||
|
|
||
|
#include <windef.h>
|
||
|
#include <strsafe.h>
|
||
|
|
||
|
int _vsnprintf_s(char *buffer, size_t sizeOfBuffer, size_t count, const char *format, va_list argptr)
|
||
|
{
|
||
|
size_t cchRemaining;
|
||
|
|
||
|
HRESULT ret = StringCchVPrintfEx(buffer, sizeOfBuffer, NULL, &cchRemaining, 0, format, argptr);
|
||
|
|
||
|
// EXAMPLE //////////////////////////
|
||
|
// -------- > Size of provided buffer in chars (8).
|
||
|
// ABC0____ > Buffer contents after StringCchVPrintfEx gets called.
|
||
|
// --- > What we actually need to return (3).
|
||
|
// ----- > Remaining chars in buffer, including post string NULL, returned by StringCchVPrintfEx (5).
|
||
|
|
||
|
/* _vsnprintf_s returns the number of characters written, not including
|
||
|
the terminating null, or a negative value if an output error occurs. */
|
||
|
|
||
|
switch (ret)
|
||
|
{
|
||
|
case S_OK:
|
||
|
return (sizeOfBuffer - cchRemaining);
|
||
|
|
||
|
case STRSAFE_E_INVALID_PARAMETER:
|
||
|
case STRSAFE_E_INSUFFICIENT_BUFFER:
|
||
|
default:
|
||
|
return -1;
|
||
|
}
|
||
|
}
|