books/apue/cp.c

   1 /*
   2  * Copy standard input to standard output (slow way)
   3  *
   4  * Would probably faster if we:
   5  *
   6  *  1. get the BUFSIZE value from stat's st_blksize member
   7  *  2. use the standard I/O functions
   8  */
   9
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <errno.h>
  14
  15 #define BUFSIZE 8192
  16
  17 int main(void)
  18 {
  19         int n;
  20         char buf[BUFSIZE];
  21
  22         while ((n = read(STDIN_FILENO, buf, BUFSIZE)) > 0)
  23                 if (write(STDOUT_FILENO, buf, n) != n)
  24                         strerror(errno);
  25
  26         if (n < 0)
  27                 strerror(errno);
  28
  29         return 0;
  30 }