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Zacam
38f7b9ab6c
git-svn-id: svn://svn.icculus.org/fs2open/branches/antipodes@10936 387891d4-d844-0410-90c0-e4c51a9137d3
115 lines
2.7 KiB
C++
115 lines
2.7 KiB
C++
#include "pstypes.h"
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/* It is a condition of use that safe_strings.cpp, safe_strings.h, safe_strings_test.cpp remain together.
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*
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* Maintained by portej05 - contact via PM on www.hard-light.net/forums
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* Why have we got this, what is it for?
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* VC2005+ define some safe string functions which check buffer sizes before doing anything
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* Unfortunately, GCC (on Linux and Mac OS X) does not yet provide these functions, therefore, we must!
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* (if only to reduce the amount of noise the static analysis tools are spitting out)
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* They are part of ISO/IEC TR 24731 and may find their way into the CRTs at some point, at which
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* point these functions must be removed from the engine.
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* While these functions do not add a huge amount of benefit for heap-allocated strings, they
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* can protect against a class of buffer overruns in stack allocated situations.
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*
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*/
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/* There is no safe strings below VS2005
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* scp safe_strings are used in VS2005+ DEBUG because they give more info
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*/
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#if !defined(NO_SAFE_STRINGS) && ( !defined( _MSC_VER ) || ( defined( _MSC_VER ) && _MSC_VER >= 1400 /* && !defined(NDEBUG) */ ))
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/* An implementation of strcpy_s
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* We're not going to actually fully behave like the MS debug version.
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*/
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errno_t scp_strcpy_s( const char* file, int line, char* strDest, size_t sizeInBytes, const char* strSource )
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{
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char* pDest;
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const char* pSource;
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size_t bufferLeft = sizeInBytes;
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if ( !strDest || !strSource )
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{
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if ( strDest )
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*strDest = '\0';
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__safe_strings_error_handler( EINVAL );
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return EINVAL;
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}
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if ( sizeInBytes == 0 )
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{
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*strDest = '\0';
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__safe_strings_error_handler( ERANGE );
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return ERANGE;
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}
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pDest = strDest;
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pSource = strSource;
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while ((*pDest++ = *pSource++) != 0 && --bufferLeft > 0);
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if ( bufferLeft == 0 )
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{
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*strDest = '\0';
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__safe_strings_error_handler( ERANGE );
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return ERANGE;
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}
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return 0;
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}
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errno_t scp_strcat_s( const char* file, int line, char* strDest, size_t sizeInBytes, const char* strSource )
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{
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char* pDest;
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const char* pSource;
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size_t bufferLeft = sizeInBytes;
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if ( !strDest || !strSource )
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{
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if ( strDest )
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*strDest = '\0';
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__safe_strings_error_handler( EINVAL );
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return EINVAL;
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}
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if ( bufferLeft == 0 )
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{
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*strDest = '\0';
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__safe_strings_error_handler( ERANGE );
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return ERANGE;
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}
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/* Find the terminating NULL of the input string */
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pDest = strDest;
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pSource = strSource;
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while ( *pDest )
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{
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pDest++;
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bufferLeft--;
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}
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if ( bufferLeft == 0 )
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{
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*strDest = '\0';
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__safe_strings_error_handler( ERANGE );
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return ERANGE;
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}
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/* Concatenate the strings */
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while ((*pDest++ = *pSource++) != 0 && --bufferLeft > 0);
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if ( bufferLeft == 0 )
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{
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*strDest = '\0';
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__safe_strings_error_handler( ERANGE );
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return ERANGE;
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}
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return 0;
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}
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#endif
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