extended_cstring.cpp

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2023 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
 *  others to use your version of this file under the CPAL, indicate your decision by 
 *  deleting the provisions above and replace them with the notice and other 
 *  provisions required by the GPL License. If you do not delete the provisions above,
 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */
 
 
 
/** @defgroup extended_cstring
 *  @brief extra functions for plain old C strings
 *  @author Bram de Greve [BdG]
 */
 
#include "lass_common.h"
#include "extended_cstring.h"
 
#if LASS_COMPILER_TYPE == LASS_COMPILER_TYPE_MSVC
#   pragma warning(disable: 4996) // 'vsnprintf': This function or variable may be unsafe.
#endif
 
namespace lass
{
namespace stde
{
 
std::string safe_vformat(const char* format, va_list args)
{
    size_t size = 256;
    std::vector<char> dynamicBuffer(size);
    while (true)
    {
        va_list ap;
        va_copy(ap, args);
        const int numWritten = ::vsnprintf(&dynamicBuffer[0], size, format, ap);
        va_end(ap);
        if (numWritten < 0)
        {
            throw std::runtime_error("safe_vformat: encoding error");
        }
        if (numWritten < static_cast<int>(size))
        {
            return std::string(&dynamicBuffer[0]);
        }
        size = static_cast<size_t>(numWritten) + 1;
        if (static_cast<int>(size) < 0)
        {
            throw std::length_error("safe_vformat: buffer is growing too large");
        }
        dynamicBuffer.resize(size);
    }
}
 
std::string safe_format(const char* format, ...)
{
    va_list args;
    va_start(args, format);
    std::string result = safe_vformat(format, args);
    va_end(args);
    return result;
}
 
}
}
 
 
// EOF