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: src/lib/libc/stdio/putc.3,v 1.5.2.3 2001/12/14 18:33:57 ru Exp $ 38.\" $DragonFly: src/lib/libc/stdio/putc.3,v 1.2 2003/06/17 04:26:46 dillon Exp $ 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.In 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 71The 72.Fn putc 73macro acts essentially identically to 74.Fn fputc , 75but is a macro that expands in-line. 76It may evaluate 77.Fa stream 78more than once, so arguments given to 79.Fn putc 80should not be expressions with potential side effects. 81.Pp 82The 83.Fn putchar 84macro 85is identical to 86.Fn putc 87with an output stream of 88.Em stdout . 89.Pp 90The 91.Fn putw 92function 93writes the specified 94.Em int 95to the named output 96.Fa stream . 97.Sh RETURN VALUES 98The functions, 99.Fn fputc , 100.Fn putc 101and 102.Fn putchar 103return the character written. 104If an error occurs, the value 105.Dv EOF 106is returned. 107The 108.Fn putw 109function 110returns 0 on success; 111.Dv EOF 112is returned if 113a write error occurs, 114or if an attempt is made to write a read-only stream. 115.Sh SEE ALSO 116.Xr ferror 3 , 117.Xr fopen 3 , 118.Xr getc 3 , 119.Xr stdio 3 120.Sh STANDARDS 121The functions 122.Fn fputc , 123.Fn putc , 124and 125.Fn putchar , 126conform to 127.St -isoC . 128A function 129.Fn putw 130function appeared in 131.At v6 . 132.Sh BUGS 133The size and byte order of an 134.Em int 135varies from one machine to another, and 136.Fn putw 137is not recommended for portable applications. 138