/*  license : GPL 
    author ; Nicola Piazzolla 
*/



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


#define MAX_STRING 1000
#define FLAG_READ  "r"
#define FLAG_WRITE "a+"

#define pathname   "NEW_FILE_MODIFIED"

void __writefile__ ( char *sentence , char *file ) { 

    FILE *fd;
    
    
    fd=fopen(pathname,FLAG_WRITE);
    fprintf(fd,"%s",sentence);
    fclose(fd);
    
   
}

  
 


int scan(char *word, char *scanword, char *file)
{
    char copy[MAX_STRING];
    int j, i = 0;
    int o =0;
    j = i;
    
    
    
    
    
    bzero(copy,MAX_STRING);
    
    while (scanword[j] != '\0') {
	
	while (word[i] != '\0' ) {
		
		if (scanword[j] != word[i]) {
		
		copy[o]=word[i];
		o++;
		
		}
		
		i++;
		
	}
	
	j++;
	i=0;
	o=0;
	strcpy(word,copy);
	bzero(copy,MAX_STRING);
	
    	
    }
    __writefile__(word,file);
    
return 0 ; 
}








int __openfile__(char *file, char *word )
{

    FILE *fd;
    char sentence[MAX_STRING];
    
    int i;

    if ((fd = fopen(file, FLAG_READ)) == NULL) {
	
	printf("The file doesnt exist\n");
	exit(-1);
	
    }
    

    while (!feof(fd)) {
	
	bzero(sentence, MAX_STRING);
	fgets(sentence, MAX_STRING, fd);

       
       
	if ( (i=scan(sentence, word, file) ) != 0) {
	    
	    fprintf(stderr,"Scan has failed\n");
	    
	}

	
    }
    
    fclose(fd);

return 1; 

}



int main(int argc, char **argv)
{
    FILE *fd ;
    int check;
    if (  (fd=fopen(pathname,FLAG_READ)) != NULL ) {
	remove(pathname);
       
    }
   


	if (argc < 3) {
	   
	    fprintf(stderr, " >>> Type %s [file] [characters]  <<< \n",argv[0]);
	    
	   }

	else {
	    
	    if ( (check=__openfile__(argv[1], argv[2])) != 1 ) {
		
		fprintf(stderr,"I cannot open the file ...\n");
	    }

	}


	
}