posix man page for putc

PUTC(3P)						     POSIX Programmer's Manual							  PUTC(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
       putc -- put a byte on a stream

SYNOPSIS
       #include <stdio.h>

       int putc(int c, FILE *stream);

DESCRIPTION
       The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here
       and the ISO C standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C standard.

       The  putc()  function shall be equivalent to fputc(), 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 fputc().

ERRORS
       Refer to fputc().

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       Since it may be implemented as a macro, putc() may treat a stream argument with side-effects incorrectly. In particular, putc(c,*f++)  does
       not necessarily work correctly.	Therefore, use of this function is not recommended in such situations; fputc() should be used instead.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Section 2.5, Standard I/O Streams, fputc()

       The Base Definitions volume of POSIX.1-2008, <stdio.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013								  PUTC(3P)