Книга: UNIX — универсальная среда программирования

3.8.14 cp.c

3.8.14 cp.c
/* cp: minimal version */
#include <stdio.h>
#define PERMS 0644 /* RW for owner, R for group, others */
char *progname;
main(argc, argv) /* cp: copy f1 to f2 */
 int argc;
 char *argv[];
{
 char buf[BUFSIZ];
 progname = argv[0];
 if (argc != 3)
  error("Usage: %s from to", progname);
 if ((f1 = open(argv[1], 0)) == -1)
  error("can't open %s", argv[1]);
 if ((f2 = creat(argv[2] , PERMS)) == -1)
  error("can't create %s", argv[2]);
 while ((n = read(f1, buf, BUFSIZ)) > 0)
  if (write(f2, buf, n) != n)
   error("write error", (char*)0);
 exit(0);
}
#include "error.c"

Оглавление книги