cat.c

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

#ifndef BUFSIZE
#define BUFSIZE 1024
#endif

static char buffer[BUFSIZE+1];

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

  int i = 1;
  FILE *fin = stdin;
  char *pch;
  int rc;//navratovy kod

  do {

     while (1==1) {
       pch = fgets(buffer, BUFSIZE, fin);
       if (pch == NULL) {//eof nebo chyba
          break;
       }
       rc = fputs(buffer, stdout);
       if (rc == EOF) {
          perror("fputs");
          exit(EXIT_FAILURE);
       }
     }

  } while(argv[i]);

  exit(EXIT_SUCCESS); 

}