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.\" 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 61writes the character 62.Fa c 63(converted to an ``unsigned char'') 64to the output stream pointed to by 65.Fa stream . 66.Pp 67The 68.Fn putc 69macro acts essentially identically to 70.Fn fputc , 71but is a macro that expands in-line. It 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 77The 78.Fn putchar 79macro 80is identical to 81.Fn putc 82with an output stream of 83.Em stdout . 84.Pp 85The 86.Fn putw 87function 88writes the specified 89.Em int 90to the named output 91.Fa stream . 92.Sh RETURN VALUES 93The functions, 94.Fn fputc , 95.Fn putc 96and 97.Fn putchar 98return the character written. 99If an error occurs, the value 100.Dv EOF 101is returned. 102The 103.Fn putw 104function 105returns 0 on success; 106.Dv EOF 107is returned if 108a write error occurs, 109or if an attempt is made to write a read-only stream. 110.Sh SEE ALSO 111.Xr ferror 3 , 112.Xr fopen 3 , 113.Xr getc 3 , 114.Xr stdio 3 115.Sh STANDARDS 116The functions 117.Fn fputc , 118.Fn putc , 119and 120.Fn putchar , 121conform to 122.St -ansiC . 123A function 124.Fn putw 125function appeared in 126.At v6 . 127.Sh BUGS 128The size and byte order of an 129.Em int 130varies from one machine to another, and 131.Fn putw 132is not recommended for portable applications. 133