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GETC(3P)                   POSIX Programmer's Manual                  GETC(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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 comparison 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 pre-
       ceded 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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(3P)