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GETC(P)			   POSIX Programmer's Manual		       GETC(P)

NAME
       getc - get a byte from a stream

SYNOPSIS
       #include <stdio.h>

       int getc(FILE *stream);

DESCRIPTION
       The  getc() function shall be equivalent to fgetc() , except that if it
       is implemented as a macro it may evaluate stream more than once, so the
       argument should never be an expression with side effects.

RETURN VALUE
       Refer to fgetc() .

ERRORS
       Refer to fgetc() .

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       If  the	integer	 value returned by getc() is stored into a variable of
       type char and then compared against the integer constant EOF, the  com‐
       parison may never succeed, because sign-extension of a variable of type
       char on widening to integer is implementation-defined.

       Since it may be implemented as a macro, getc() may treat incorrectly  a
       stream  argument	 with side effects. In particular, getc(*f++) does not
       necessarily work as expected.  Therefore, use of this  function	should
       be  preceded by "#undef getc" in such situations; fgetc() could also be
       used.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fgetc()	,  the	Base  Definitions  volume   of	 IEEE Std 1003.1-2001,
       <stdio.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			       GETC(P)
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