commands/autil/rd_bytes.c

   1 /* $Id$ */
   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
   7 #include "obj.h"
   8
   9 #define MININT          (1 << (sizeof(int) * 8 - 1))
  10 #define MAXCHUNK        (~MININT)       /* Highest count we read(2).    */
  11 /* Unfortunately, MAXCHUNK is too large with some  compilers. Put it in
  12    an int!
  13 */
  14
  15 static int maxchunk = MAXCHUNK;
  16
  17 /*
  18  * We don't have to worry about byte order here.
  19  * Just read "cnt" bytes from file-descriptor "fd".
  20  */
  21 void
  22 rd_bytes(fd, string, cnt)
  23         register char   *string;
  24         register long   cnt;
  25 {
  26
  27         while (cnt) {
  28                 register int n = cnt >= maxchunk ? maxchunk : cnt;
  29
  30                 if (read(fd, string, n) != n)
  31                         rd_fatal();
  32                 string += n;
  33                 cnt -= n;
  34         }
  35 }