ReactOS
0.4.16-dev-197-g92996da
_reactos_strsafe_wrapper.c
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/*
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* Handy secure string adapter functions for mbedTLS,
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* converting from `StringCchVPrintfEx` to `_vsnprintf_s`.
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*
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* Copyright 2015 Ismael Ferreras Morezuelas <swyterzone+ros@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <
windef.h
>
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#include <
strsafe.h
>
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int
_vsnprintf_s
(
char
*
buffer
,
size_t
sizeOfBuffer
,
size_t
count
,
const
char
*
format
,
va_list
argptr)
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{
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size_t
cchRemaining;
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HRESULT
ret
=
StringCchVPrintfEx
(
buffer
,
sizeOfBuffer
,
NULL
, &cchRemaining, 0,
format
, argptr);
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// EXAMPLE //////////////////////////
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// -------- > Size of provided buffer in chars (8).
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// ABC0____ > Buffer contents after StringCchVPrintfEx gets called.
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// --- > What we actually need to return (3).
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// ----- > Remaining chars in buffer, including post string NULL, returned by StringCchVPrintfEx (5).
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/* _vsnprintf_s returns the number of characters written, not including
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the terminating null, or a negative value if an output error occurs. */
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switch
(
ret
)
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{
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case
S_OK
:
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return
(
sizeOfBuffer
- cchRemaining);
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case
STRSAFE_E_INVALID_PARAMETER
:
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case
STRSAFE_E_INSUFFICIENT_BUFFER
:
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default
:
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return
-1;
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}
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}
_vsnprintf_s
int _vsnprintf_s(char *buffer, size_t sizeOfBuffer, size_t count, const char *format, va_list argptr)
Definition:
_reactos_strsafe_wrapper.c:25
va_list
char * va_list
Definition:
acmsvcex.h:78
NULL
#define NULL
Definition:
types.h:112
count
GLuint GLuint GLsizei count
Definition:
gl.h:1545
buffer
GLuint buffer
Definition:
glext.h:5915
HRESULT
Definition:
mshtmhst.idl:286
S_OK
#define S_OK
Definition:
intsafe.h:52
sizeOfBuffer
static size_t sizeOfBuffer
Definition:
printf.c:68
strsafe.h
StringCchVPrintfEx
#define StringCchVPrintfEx
Definition:
strsafe.h:647
STRSAFE_E_INVALID_PARAMETER
#define STRSAFE_E_INVALID_PARAMETER
Definition:
strsafe.h:104
STRSAFE_E_INSUFFICIENT_BUFFER
#define STRSAFE_E_INSUFFICIENT_BUFFER
Definition:
strsafe.h:103
format
Definition:
format.c:58
ret
int ret
Definition:
wcstombs-tests.c:31
windef.h
dll
3rdparty
mbedtls
_reactos_strsafe_wrapper.c
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