toolchain/gcc/newlib/libc/stdio/getw.c

   1 /*
   2  * Copyright (c) 1990 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted
   6  * provided that the above copyright notice and this paragraph are
   7  * duplicated in all such forms and that any documentation,
   8  * advertising materials, and other materials related to such
   9  * distribution and use acknowledge that the software was developed
  10  * by the University of California, Berkeley.  The name of the
  11  * University may not be used to endorse or promote products derived
  12  * from this software without specific prior written permission.
  13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  16  */
  17
  18 /*
  19 FUNCTION
  20 <<getw>>---read a word (int)
  21
  22 INDEX
  23         getw
  24
  25 ANSI_SYNOPSIS
  26         #include <stdio.h>
  27         int getw(FILE *<[fp]>);
  28
  29 TRAD_SYNOPSIS
  30         #include <stdio.h>
  31         int getw(<[fp]>)
  32         FILE *<[fp]>;
  33
  34 DESCRIPTION
  35 <<getw>> is a function, defined in <<stdio.h>>.  You can use <<getw>>
  36 to get the next word from the file or stream identified by <[fp]>.  As
  37 a side effect, <<getw>> advances the file's current position
  38 indicator.
  39
  40 RETURNS The next word (read as an <<int>>), unless there is no more
  41 data, or the host system reports a read error; in either of these
  42 situations, <<getw>> returns <<EOF>>.  Since <<EOF>> is a valid
  43 <<int>>, you must use <<ferror>> or <<feof>> to distinguish these
  44 situations.
  45
  46 PORTABILITY
  47 <<getw>> is a remnant of K&R C, it is not part of any ISO C Standard.
  48 <<fread>> should be used instead.  In fact, this implementation of
  49 <<getw>> is based upon <<fread>>.
  50
  51 Supporting OS subroutines required: <<fread>>.  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 static char sccsid[] = "%W% (Berkeley) %G%";
  55 #endif /* LIBC_SCCS and not lint */
  56
  57 #include <stdio.h>
  58
  59 int
  60 getw (fp)
  61      register FILE *fp;
  62 {
  63   int result;
  64   if (fread((char*)&result, sizeof(result), 1, fp) != 1)
  65     return EOF;
  66   return result;
  67 }