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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051/* * 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; }}