1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. 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.\" @(#)putc.3 8.1 (Berkeley) 6/4/93 37.\" $FreeBSD$ 38.\" 39.Dd June 4, 1993 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 LIBRARY 49.Lb libc 50.Sh SYNOPSIS 51.In stdio.h 52.Ft int 53.Fn fputc "int c" "FILE *stream" 54.Ft int 55.Fn putc "int c" "FILE *stream" 56.Ft int 57.Fn putchar "int c" 58.Ft int 59.Fn putw "int w" "FILE *stream" 60.Sh DESCRIPTION 61The 62.Fn fputc 63function 64writes the character 65.Fa c 66(converted to an ``unsigned char'') 67to the output stream pointed to by 68.Fa stream . 69.Pp 70The 71.Fn putc 72macro acts essentially identically to 73.Fn fputc , 74but is a macro that expands in-line. 75It may evaluate 76.Fa stream 77more than once, so arguments given to 78.Fn putc 79should not be expressions with potential side effects. 80.Pp 81The 82.Fn putchar 83macro 84is identical to 85.Fn putc 86with an output stream of 87.Em stdout . 88.Pp 89The 90.Fn putw 91function 92writes the specified 93.Em int 94to the named output 95.Fa stream . 96.Sh RETURN VALUES 97The functions, 98.Fn fputc , 99.Fn putc 100and 101.Fn putchar 102return the character written. 103If an error occurs, the value 104.Dv EOF 105is returned. 106The 107.Fn putw 108function 109returns 0 on success; 110.Dv EOF 111is returned if 112a write error occurs, 113or if an attempt is made to write a read-only stream. 114.Sh SEE ALSO 115.Xr ferror 3 , 116.Xr fopen 3 , 117.Xr getc 3 , 118.Xr stdio 3 119.Sh STANDARDS 120The functions 121.Fn fputc , 122.Fn putc , 123and 124.Fn putchar , 125conform to 126.St -isoC . 127A function 128.Fn putw 129function appeared in 130.At v6 . 131.Sh BUGS 132The size and byte order of an 133.Em int 134varies from one machine to another, and 135.Fn putw 136is not recommended for portable applications. 137