suse man page for getc

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 differ (consult the correspond-
       ing 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 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 Technol-
       ogy -- 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(3P)