1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" from: @(#)putc.3 6.7 (Berkeley) 6/29/91 37.\" $Id: putc.3,v 1.2 1993/08/01 07:44:54 mycroft Exp $ 38.\" 39.Dd June 29, 1991 40.Dt PUTC 3 41.Os 42.Sh NAME 43.Nm fputc , 44.Nm putc , 45.Nm putchar , 46.Nm putw 47.Nd output a character or word to a stream 48.Sh SYNOPSIS 49.Fd #include <stdio.h> 50.Ft int 51.Fn fputc "int c" "FILE *stream" 52.Ft int 53.Fn putc "int c" "FILE *stream" 54.Ft int 55.Fn putchar "int c" 56.Ft int 57.Fn putw "int w" "FILE *stream" 58.Sh DESCRIPTION 59The 60.Fn fputc 61function 62writes the character 63.Fa c 64(converted to an ``unsigned char'') 65to the output stream pointed to by 66.Fa stream . 67.Pp 68.Fn Putc 69acts essentially identically to 70.Fn fputc , 71but is a macro that expands in-line. It may evaluate 72.Fa stream 73more than once, so arguments given to 74.Fn putc 75should not be expressions with potential side effects. 76.Pp 77.Fn Putchar 78is identical to 79.Fn putc 80with an output stream of 81.Em stdout . 82.Pp 83The 84.Fn putw 85function 86writes the specified 87.Em int 88to the named output 89.Fa stream . 90.Sh RETURN VALUES 91The functions, 92.Fn fputc , 93.Fn putc 94and 95.Fn putchar 96return the character written. 97If an error occurs, the value 98.Dv EOF 99is returned. 100The 101.Fn putw 102function 103returns 0 on success; 104.Dv EOF 105is returned if 106a write error occurs, 107or if an attempt is made to write a read-only stream. 108.Sh SEE ALSO 109.Xr ferror 3 , 110.Xr fopen 3 , 111.Xr getc 3 , 112.Xr stdio 3 113.Sh STANDARDS 114The functions 115.Fn fputc , 116.Fn putc , 117and 118.Fn putchar , 119conform to 120.St -ansiC . 121A function 122.Fn putw 123function appeared in 124.At v6 . 125.Sh BUGS 126The size and byte order of an 127.Em int 128varies from one machine to another, and 129.Fn putw 130is not recommended for portable applications. 131