/*  Search.c   (c) Kari Laitinen

    http://www.naturalprogramming.com

    1997-??-??  File created.
    2013-11-19  Last modification.
*/

#include   <stdio.h>
#include   <stdlib.h>
#include   <string.h>

void search_string_in_file( char file_name_from_caller[],
                            char string_to_be_searched[] )
{
    FILE   *file_pointer  ;
    char   text_line_from_file[100] ;
    int    line_counter  =  0 ;

    file_pointer  =  fopen( file_name_from_caller, "r" ) ;

    if ( file_pointer  ==  NULL )
    {
        printf( "\n Error in opening file %s  !\n",
                   file_name_from_caller  ) ;
    }
    else
    {
        printf ( "\n Searching.. \"%s\"\n", string_to_be_searched ) ;

        while( fgets( text_line_from_file,
                           sizeof ( text_line_from_file ),
                           file_pointer ) != 0  )
        {
            line_counter  ++ ;
            if ( strstr( text_line_from_file,
                             string_to_be_searched ) != 0 )
            {
               printf( "\nString \"%s\" ", string_to_be_searched ) ;
               printf( "was found on line %d", line_counter ) ;
            }
        }

        fclose( file_pointer ) ;
    }
}

int main( int   number_of_command_line_arguments,
          char* command_line_arguments[] )
{
    char   file_name_given_by_user[ 20 ] ;
    char   string_to_be_searched[ 100 ] ;

    if ( number_of_command_line_arguments  ==  3 )
    {
        search_string_in_file ( command_line_arguments[ 1 ],
                                command_line_arguments[ 2 ] ) ;
    }
    else
    {
        printf( "\n This program can search a string in a " ) ;
        printf( "\n text file. Give first a file name :  " ) ;
        gets( file_name_given_by_user ) ;

        printf( "\n Type in a string to be searched: " ) ;
        gets( string_to_be_searched ) ;

        search_string_in_file( file_name_given_by_user,
                               string_to_be_searched ) ;
    }
}