1.\" $OpenBSD: putc.3,v 1.5 2000/04/20 01:39:32 aaron Exp $ 2.\" 3.\" Copyright (c) 1990, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" Chris Torek and the American National Standards Committee X3, 8.\" on Information Processing Systems. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. All advertising materials mentioning features or use of this software 19.\" must display the following acknowledgement: 20.\" This product includes software developed by the University of 21.\" California, Berkeley and its contributors. 22.\" 4. Neither the name of the University nor the names of its contributors 23.\" may be used to endorse or promote products derived from this software 24.\" without specific prior written permission. 25.\" 26.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36.\" SUCH DAMAGE. 37.\" 38.Dd June 4, 1993 39.Dt PUTC 3 40.Os 41.Sh NAME 42.Nm fputc , 43.Nm putc , 44.Nm putchar , 45.Nm putw 46.Nd output a character or word to a stream 47.Sh SYNOPSIS 48.Fd #include <stdio.h> 49.Ft int 50.Fn fputc "int c" "FILE *stream" 51.Ft int 52.Fn putc "int c" "FILE *stream" 53.Ft int 54.Fn putchar "int c" 55.Ft int 56.Fn putw "int w" "FILE *stream" 57.Sh DESCRIPTION 58The 59.Fn fputc 60function writes the character 61.Fa c 62(converted to an 63.Li unsigned char ) 64to the output stream pointed to by 65.Fa stream . 66.Pp 67.Fn putc 68acts essentially identically to 69.Fn fputc , 70but is a macro that expands in-line. 71It 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 writes the specified 86.Li int 87.Fa w 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 a write error occurs, 106or if an attempt is made to write a read-only stream. 107.Sh SEE ALSO 108.Xr ferror 3 , 109.Xr fopen 3 , 110.Xr getc 3 , 111.Xr stdio 3 112.Sh STANDARDS 113The functions 114.Fn fputc , 115.Fn putc , 116and 117.Fn putchar , 118conform to 119.St -ansiC . 120A function 121.Fn putw 122function appeared in 123.At v6 . 124.Sh BUGS 125Since the size and byte order of an 126.Li int 127varies from one machine to another, 128.Fn putw 129is not recommended for portable applications. 130