This might help. It is simple C program I wrote a while back that takes in STDIN, and prints it to STDOUT.

#include <stdio.h>
#include <stdlib.h>
#define RETBUFF 512

int main(int argc, char** argv) {
  char* input[RETBUFF]; 
  while (fscanf(stdin,"%s",&input) != EOF) {   
    printf("%s",&input);
    fflush(stdout);
  } 
  return 0;
}
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