cat w/ stdio

gistfile1.c

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

int main(int argc, char const *argv[])
{

  int i;
  for (i = 1; i < argc; i++) {
    FILE *f = fopen(argv[i], "r");
    int c;
    if (!f) {
      perror(argv[i]);
      exit(1);
    }
    while ((c = fgetc(f)) != EOF) {
      if (putchar(c) < 0) {
        exit(1);
      }
    }
    fclose(f);
  }
  
  exit(0);

}