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decoder.c
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decoder.c
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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/wait.h>
int main(){
char mainDecoderFifo[] = "Main_Decoder";
int fd = open(mainDecoderFifo, O_RDONLY);
char str[10000];
char charFromMain;
int i = 0;
read(fd, &charFromMain, sizeof(char));
while(charFromMain != '\0'){
if(charFromMain != ' ' && charFromMain != '\n'){
read(fd, &str[i], sizeof(char));
i++;
}
read(fd, &charFromMain, sizeof(char));
}
str[i] = '\0';
close(fd);
// caesar cipher
char ch;
for(i = 0; str[i] != '\0'; ++i){
ch = str[i];
if(ch >= 'a' && ch <= 'w'){
ch = ch + 3;
}
else if ( ch == 'x'){
ch = 'a';
}
else if( ch == 'y'){
ch = 'b';
}
else if(ch == 'z'){
ch = 'c';
}
else if(ch >= 'A' && ch <= 'W'){
ch = ch + 3;
}
else if ( ch == 'X'){
ch = 'A';
}
else if( ch == 'Y'){
ch = 'B';
}
else if(ch == 'Z'){
ch = 'C';
}
str[i] = ch;
}
FILE *out=fopen("decoder.txt","w");
fputs(str,out);
fclose(out);
char Decoder_Finder_Fifo[] = "Decoder_Finder";
mkfifo(Decoder_Finder_Fifo,0666);
int fd_fifo = open(Decoder_Finder_Fifo,O_WRONLY);
write(fd_fifo, str , strlen(str)+1);
close(fd_fifo);
while(wait(NULL) > 0);
return 0;
}