//testfile.cpp  --- test file i/o -- copyLeft by tsaiwn@csie.nctu.edu.tw
#ifdef unix
#ifndef __unix__
#define __unix__
#endif
#endif
#include <string.h>   /* strlen, str... */
#include <stdio.h>    /** fopen, printf, ... **/
#include <stdlib.h>
#include <fcntl.h>    /*** O_CREAT, O_... ***/
#ifdef __unix__
#include <sys/stat.h> /*** S_IWRITE defined in this file ***/
#else
#include <sys\stat.h> /*** S_IWRITE defined in this file ***/
#endif 

#ifdef __unix__
#include <unistd.h>   /* required for new version */
#define O_TEXT O_RDWR
#else
#include <io.h>	      /*** open, write, read ***/
#include <process.h>  /**** for "system" function calls ****/
#endif

#define crln printf("\n")
void test1(void)
 {
   long kk=12345678;  /** printf --Ctrl_F1--> data type **/
     printf("in test1 .. "); 
     printf("\nkk=%d  ??  %ld  ???   %Ld\n",kk, kk, kk);
     printf(" Correct kk=%ld\n================\n",kk);
 }
int main(void)
{
  int handle;   // an integer for System calls open/read/write/close
  FILE *in, *out;   // FILE pointer for standard fxxx functions
  int i,j;
  char msg[] = "Hello world";
    printf("\nTest file I/O --- by tsaiwn@csie.nctu.edu.tw\n");
    printf("\n== call test1 to test printf with wrong %%format ==\n");
    test1();
    for(i=1; i <= 9; crln, i++)
       for(j=1; printf("%5d",i*j), j<=8; j++);
    if ((handle = open("TEST.del", O_CREAT | O_TEXT,
                          S_IWRITE | S_IREAD)) == -1)
    {   // handle should >= 0, if handle is -1 ==> open fail
       perror("ErRor:");   return 1;
    }
    write(handle, "Hey, you!\n",10);   // write out 10 characters
    write(handle, msg, strlen(msg));   // the length is calculated
    write(handle, "\n", 1);  close(handle);
    fprintf(stderr, "TEST.del created!\n");  // always on Screen
#ifdef __unix__
    system("/bin/ls -l  TEST.*");
#else
    system("dir test.*");
#endif
     /****** Now try C standard Library functions fopen, ...******/
    if ( (in = fopen("TEST.del", "rt"))   /** Read Text **/
                == NULL )    /*** NULL == 0 , see stdio.h ***/
    {
      fprintf(stderr, "fopen -- Cannot open input file TEST.del\n");
      return 1;
    }
    while (!feof(in))    // Loop till feof(in)
       fputc(fgetc(in), stdout);  /* fputchar(??) === putchar(??) */
    fclose(in);
     /****** then, type out the content of file TEST.del ******/
#ifdef __unix__
    printf("\n%%  cat -n TEST.del\n");
    system("cat -n  TEST.del");
#else
    printf("\nC:> type test.del\n");
    system("type TEST.del");
#endif
    printf("\nBye bye!\n");
    return 0;
}