commands/aal/rd_bytes.c

   1 /* $Header$ */
   2 /*
   3  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
   4  * See the copyright notice in the ACK home directory, in the file "Copyright".
   5  */
   6 #define MININT          (1 << (sizeof(int) * 8 - 1))
   7 #define MAXCHUNK        (~MININT)       /* Highest count we read(2).    */
   8 /* Unfortunately, MAXCHUNK is too large with some  compilers. Put it in
   9    an int!
  10 */
  11
  12 static int maxchunk = MAXCHUNK;
  13
  14 /*
  15  * We don't have to worry about byte order here.
  16  * Just read "cnt" bytes from file-descriptor "fd".
  17  */
  18 int
  19 rd_bytes(fd, string, cnt)
  20         register char   *string;
  21         register long   cnt;
  22 {
  23
  24         while (cnt) {
  25                 register int n = cnt >= maxchunk ? maxchunk : cnt;
  26
  27                 if (read(fd, string, n) != n)
  28                         rd_fatal();
  29                 string += n;
  30                 cnt -= n;
  31         }
  32 }