StringUtil.cpp

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/*
 * StringUtil.cpp
 *
 * Copyright 2002, Log4cpp Project. All rights reserved.
 *
 * See the COPYING file for the terms of usage and distribution.
 */
#include "StringUtil.hh"
#include <iterator>
#include <stdio.h>

#if defined(_MSC_VER)
    #define VSNPRINTF _vsnprintf
#else
#ifdef LOG4CPP_HAVE_SNPRINTF
    #define VSNPRINTF vsnprintf
#else
/* use alternative snprintf() from http://www.ijs.si/software/snprintf/ */

#define HAVE_SNPRINTF
#define PREFER_PORTABLE_SNPRINTF

#include <stdlib.h>
#include <stdarg.h>

extern "C" {
#include "snprintf.c"
}

#define VSNPRINTF portable_vsnprintf

#endif // LOG4CPP_HAVE_SNPRINTF
#endif // _MSC_VER

namespace log4cpp {

    std::string StringUtil::vform(const char* format, va_list args) {
        size_t size = 1024;
        char* buffer = new char[size];
            
        while (1) {
            va_list args_copy;

#if defined(_MSC_VER) || defined(__BORLANDC__)
            args_copy = args;
#else
            va_copy(args_copy, args);
#endif

            int n = VSNPRINTF(buffer, size, format, args_copy);

            va_end(args_copy);
                
            // If that worked, return a string.
            if ((n > -1) && (static_cast<size_t>(n) < size)) {
                std::string s(buffer);
                delete [] buffer;
                return s;
            }
                
            // Else try again with more space.
            size = (n > -1) ?
                n + 1 :   // ISO/IEC 9899:1999
                size * 2; // twice the old size
                
            delete [] buffer;
            buffer = new char[size];
        }
    }

    std::string StringUtil::trim(const std::string& s) {
        static const char* whiteSpace = " \t\r\n";

        // test for null string
        if(s.empty())
            return s;

        // find first non-space character
        std::string::size_type b = s.find_first_not_of(whiteSpace);
        if(b == std::string::npos) // No non-spaces
            return "";

        // find last non-space character
        std::string::size_type e = s.find_last_not_of(whiteSpace);

        // return the remaining characters
        return std::string(s, b, e - b + 1);
    }

    unsigned int StringUtil::split(std::vector<std::string>& v,
                                   const std::string& s,
                                   char delimiter, unsigned int maxSegments) {
        v.clear();
        std::back_insert_iterator<std::vector<std::string> > it(v);
        return split(it, s, delimiter, maxSegments);
    }

}