removeLineEndSpace

/******************************************************************************
 *                          removeLineEndSpace
 *  声明：
 *      该程序是之前alignBySpace的逆向补充程序，去掉行尾的空格。
 *      
 *                                   2015-8-11 阵雨 深圳 南山平山村 曾剑锋
 *****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main ( int argc, char ** argv ) {

    int    ret                      = 0;
    char  *tempFile                 = "generateFile.txt";
    char  *readBuffer               = NULL;
    size_t bufferSize               = 512;
    int    readBufferIndex          = 0;

    if (  argc != 2  ) {
        printf ( "USAGE:
" );
        printf ( "   removeLineEndSpace <file>.
" );
        return -1;
    }

    FILE *readfile  = fopen ( argv[1], "r" );                         // only read
    FILE *writefile = fopen ( tempFile, "w" );                        // only write

    /**
     * man datasheet:
     *    If *lineptr is NULL, then getline() will allocate a buffer for storing the line, 
     *    which should be freed by the user program. (In this case, the value in *n is ignored.)
     */
    while ( ( ret = getline( &readBuffer, &bufferSize, readfile ) ) != -1 ) {

        readBufferIndex  = ret - 1; // index for real position

        while ( ( readBuffer [ readBufferIndex ] == ' ' ) ||          // del ' ', '	', '
' character
                ( readBuffer [ readBufferIndex ] == '
' ) || ( readBuffer [ readBufferIndex ] == '	' ) )  
            readBuffer [ readBufferIndex-- ] = '';
        
        readBuffer [ readBufferIndex + 1 ] = '
';

        fputs ( readBuffer, writefile );                              // write to file 

        bzero ( readBuffer,  ret );                                   // clean buffer
    }

    free ( readBuffer );                                              // referrence getline()

    fclose ( readfile );
    fclose ( writefile );

    remove ( argv[1] );                                               // delete source file
    rename ( tempFile, argv[1] );                                     // tempfile rename to source file
}