1.\" $NetBSD: putc.3,v 1.5 1998/08/29 08:32:34 lukem 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.\" @(#)putc.3 8.1 (Berkeley) 6/4/93 39.\" 40.Dd June 4, 1993 41.Dt PUTC 3 42.Os 43.Sh NAME 44.Nm fputc , 45.Nm putc , 46.Nm putchar , 47.Nm putw 48.Nd output a character or word to a stream 49.Sh LIBRARY 50.Lb libc 51.Sh SYNOPSIS 52.Fd #include <stdio.h> 53.Ft int 54.Fn fputc "int c" "FILE *stream" 55.Ft int 56.Fn putc "int c" "FILE *stream" 57.Ft int 58.Fn putchar "int c" 59.Ft int 60.Fn putw "int w" "FILE *stream" 61.Sh DESCRIPTION 62The 63.Fn fputc 64function 65writes the character 66.Fa c 67(converted to an ``unsigned char'') 68to the output stream pointed to by 69.Fa stream . 70.Pp 71.Fn putc 72acts essentially identically to 73.Fn fputc , 74but is a macro that expands in-line. It may evaluate 75.Fa stream 76more than once, so arguments given to 77.Fn putc 78should not be expressions with potential side effects. 79.Pp 80.Fn putchar 81is identical to 82.Fn putc 83with an output stream of 84.Em stdout . 85.Pp 86The 87.Fn putw 88function 89writes the specified 90.Em int 91to the named output 92.Fa stream . 93.Sh RETURN VALUES 94The functions, 95.Fn fputc , 96.Fn putc 97and 98.Fn putchar 99return the character written. 100If an error occurs, the value 101.Dv EOF 102is returned. 103The 104.Fn putw 105function 106returns 0 on success; 107.Dv EOF 108is returned if 109a write error occurs, 110or if an attempt is made to write a read-only stream. 111.Sh SEE ALSO 112.Xr ferror 3 , 113.Xr fopen 3 , 114.Xr getc 3 , 115.Xr stdio 3 116.Sh STANDARDS 117The functions 118.Fn fputc , 119.Fn putc , 120and 121.Fn putchar , 122conform to 123.St -ansiC . 124A function 125.Fn putw 126function appeared in 127.At v6 . 128.Sh BUGS 129The size and byte order of an 130.Em int 131varies from one machine to another, and 132.Fn putw 133is not recommended for portable applications. 134