ReactOS  0.4.15-dev-1068-g467feb9
_reactos_strsafe_wrapper.c
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1 /*
2  * Handy secure string adapter functions for mbedTLS,
3  * converting from `StringCchVPrintfEx` to `_vsnprintf_s`.
4  *
5  * Copyright 2015 Ismael Ferreras Morezuelas <swyterzone+ros@gmail.com>
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20  */
21 
22 #include <windef.h>
23 #include <strsafe.h>
24 
25 int _vsnprintf_s(char *buffer, size_t sizeOfBuffer, size_t count, const char *format, va_list argptr)
26 {
27  size_t cchRemaining;
28 
29  HRESULT ret = StringCchVPrintfEx(buffer, sizeOfBuffer, NULL, &cchRemaining, 0, format, argptr);
30 
31  // EXAMPLE //////////////////////////
32  // -------- > Size of provided buffer in chars (8).
33  // ABC0____ > Buffer contents after StringCchVPrintfEx gets called.
34  // --- > What we actually need to return (3).
35  // ----- > Remaining chars in buffer, including post string NULL, returned by StringCchVPrintfEx (5).
36 
37  /* _vsnprintf_s returns the number of characters written, not including
38  the terminating null, or a negative value if an output error occurs. */
39 
40  switch (ret)
41  {
42  case S_OK:
43  return (sizeOfBuffer - cchRemaining);
44 
47  default:
48  return -1;
49  }
50 }
GLuint GLuint GLsizei count
Definition: gl.h:1545
GLuint buffer
Definition: glext.h:5915
#define StringCchVPrintfEx
Definition: strsafe.h:647
#define STRSAFE_E_INSUFFICIENT_BUFFER
Definition: strsafe.h:103
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: gl.h:1546
#define STRSAFE_E_INVALID_PARAMETER
Definition: strsafe.h:104
smooth NULL
Definition: ftsmooth.c:416
char * va_list
Definition: acmsvcex.h:78
LONG HRESULT
Definition: typedefs.h:79
int ret
int _vsnprintf_s(char *buffer, size_t sizeOfBuffer, size_t count, const char *format, va_list argptr)
#define S_OK
Definition: intsafe.h:51
static size_t sizeOfBuffer
Definition: printf.c:66