1	/* kbFile.c
   2	   This example shows how to save keyboard input to a disk file.
   3	   System calls used in this program:
   4	    . write(), read(), open(), close(), exit().
   5	*/
     
   6	#include <stdio.h>
   7	#include <fcntl.h>
   8	#include <string.h>
   9	#include <stdlib.h>
  10	#include <unistd.h>
  11	#include <sys/stat.h> 
     
  12	#define FMODE  (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
     
  13	main()
  14	{
  15	   char buf[BUFSIZ];
  16	   char PROMPT1[] = "Please enter output filename >> "; 
  17	   char PROMPT2[] = "Please enter input, to be terminated by <ctrl-d>\n";
  18	   char ERR[] = "Can't open output file\n";
  19	   int fd;
  20	   ssize_t nread;
     
  21	   write(STDOUT_FILENO, PROMPT1, strlen(PROMPT1)); /* write to stdout */
  22	   nread = read(STDIN_FILENO, buf, BUFSIZ);        /* read from stdin */
  23	   buf[nread-1] = '\0';                   /* strip \n & NULL-terminate buf */
     
  24	   if ((fd = open(buf, O_WRONLY | O_CREAT | O_TRUNC, FMODE)) == -1) {
  25	       write(STDERR_FILENO, ERR, strlen(ERR));    /* write to stderr */
  26	       return(1);
  27	   }
     
  28	   write(STDOUT_FILENO, PROMPT2, strlen(PROMPT2));
  29	   while (1) {
  30	       nread = read(STDIN_FILENO, buf, BUFSIZ);  /* count char's read */
  31	       if (nread > 0)          
  32	           write(fd, buf, nread);                /* save to file */
  33	       else
  34	          break;                         /* EOF detected - assume no error */
  35	   }
  36	   close(fd);                            /* close output file */
  37	   exit(0);                              /* cool */
  38	}