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.TH PUTC "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"

.SH PROLOG

This manual page is part of the POSIX Programmer's Manual.

The Linux implementation of this interface may differ (consult

the corresponding Linux manual page for details of Linux behavior),

or the interface may not be implemented on Linux.

.SH NAME

putc

\(em put a byte on a stream

.SH SYNOPSIS

.LP

.nf

#include <stdio.h>

.P

int putc(int \fIc\fP, FILE *\fIstream\fP);

.fi

.SH 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\(hy2008 defers to the ISO\ C standard.

.P

The

\fIputc\fR()

function shall be equivalent to

\fIfputc\fR(),

except that if it is implemented as a macro it may evaluate

.IR stream

more than once, so the argument should never be an expression with

side-effects.

.SH "RETURN VALUE"

Refer to

.IR "\fIfputc\fR\^(\|)".

.SH ERRORS

Refer to

.IR "\fIfputc\fR\^(\|)".

.LP

.IR "The following sections are informative."

.SH EXAMPLES

None.

.SH "APPLICATION USAGE"

Since it may be implemented as a macro,

\fIputc\fR()

may treat a

.IR stream

argument with side-effects incorrectly. In particular,

\fIputc\fP(\fIc\fP,*\fIf\fP++) does not necessarily work correctly.

Therefore, use of this function is not recommended in such situations;

\fIfputc\fR()

should be used instead.

.SH RATIONALE

None.

.SH "FUTURE DIRECTIONS"

None.

.SH "SEE ALSO"

.IR "Section 2.5" ", " "Standard I/O Streams",

.IR "\fIfputc\fR\^(\|)"

.P

The Base Definitions volume of POSIX.1\(hy2008,

.IR "\fB<stdio.h>\fP"

.SH COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form

from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology

-- 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 Standard

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 .