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 January 10, 2003 40.Dt PUTC 3 41.Os 42.Sh NAME 43.Nm fputc , 44.Nm putc , 45.Nm putc_unlocked , 46.Nm putchar , 47.Nm putchar_unlocked , 48.Nm putw 49.Nd output a character or word to a stream 50.Sh LIBRARY 51.Lb libc 52.Sh SYNOPSIS 53.In stdio.h 54.Ft int 55.Fn fputc "int c" "FILE *stream" 56.Ft int 57.Fn putc "int c" "FILE *stream" 58.Ft int 59.Fn putc_unlocked "int c" "FILE *stream" 60.Ft int 61.Fn putchar "int c" 62.Ft int 63.Fn putchar_unlocked "int c" 64.Ft int 65.Fn putw "int w" "FILE *stream" 66.Sh DESCRIPTION 67The 68.Fn fputc 69function 70writes the character 71.Fa c 72(converted to an ``unsigned char'') 73to the output stream pointed to by 74.Fa stream . 75.Pp 76The 77.Fn putc 78function acts essentially identically to 79.Fn fputc . 80.Pp 81The 82.Fn putchar 83function 84is identical to 85.Fn putc 86with an output stream of 87.Dv stdout . 88.Pp 89The 90.Fn putw 91function 92writes the specified 93.Vt int 94to the named output 95.Fa stream . 96.Pp 97The 98.Fn putc_unlocked 99and 100.Fn putchar_unlocked 101functions are equivalent to 102.Fn putc 103and 104.Fn putchar 105respectively, 106except that the caller is responsible for locking the stream 107with 108.Xr flockfile 3 109before calling them. 110These functions may be used to avoid the overhead of locking the stream 111for each character, and to avoid output being interspersed from multiple 112threads writing to the same stream. 113.Sh RETURN VALUES 114The functions, 115.Fn fputc , 116.Fn putc , 117.Fn putchar , 118.Fn putc_unlocked 119and 120.Fn putchar_unlocked 121return the character written. 122If an error occurs, the value 123.Dv EOF 124is returned. 125The 126.Fn putw 127function 128returns 0 on success; 129.Dv EOF 130is returned if 131a write error occurs, 132or if an attempt is made to write a read-only stream. 133.Sh SEE ALSO 134.Xr ferror 3 , 135.Xr flockfile 3 , 136.Xr fopen 3 , 137.Xr getc 3 , 138.Xr putwc 3 , 139.Xr stdio 3 140.Sh STANDARDS 141The functions 142.Fn fputc , 143.Fn putc , 144and 145.Fn putchar , 146conform to 147.St -isoC . 148The 149.Fn putc_unlocked 150and 151.Fn putchar_unlocked 152functions conform to 153.St -p1003.1-2001 . 154A function 155.Fn putw 156function appeared in 157.At v6 . 158.Sh BUGS 159The size and byte order of an 160.Vt int 161varies from one machine to another, and 162.Fn putw 163is not recommended for portable applications. 164