C++按单词换行的函数的代码

工作过程中，把写代码过程比较好的代码片段做个记录，如下的代码段是关于C++按单词换行的函数的代码，希望对码农也有用途。

   This function takes a string and an output buffer and a desired width. It then copies 
   the string to the buffer, inserting a new line character when a certain line
   length is reached.  If the end of the line is in the middle of a word, it will
   backtrack along the string until white space is found.

#include <string.h>
#include <ctype.h>

    int i = 0;
    int k, counter;

    while(i < strlen( string ) ) 
    {
        for ( counter = 1; counter <= line_width; counter++ ) 
        {
            if ( i == strlen( string ) ) 
            {
                buffer[ i ] = 0;
                return buffer;
            }
            buffer[ i ] = string[ i ];
            if ( buffer[ i ] == 'n' )
            {
                counter = 1; 
            }
            i++;
        }
        if ( isspace( string[ i ] ) ) 
        {
            buffer[i] = 'n';
            i++;
        } 
        else
        {
            for ( k = i; k > 0; k--) 
            {
                if ( isspace( string[ k ] ) ) 
                {
                    buffer[ k ] = 'n';
                    i = k + 1;
                    break;
                }
            }
        }
    }
    buffer[ i ] = 0;

    return buffer;