mirror of https://github.com/mkerrisk/man-pages
140 lines
3.3 KiB
Groff
140 lines
3.3 KiB
Groff
.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\" Modified Sat Jul 24 18:42:59 1993 by Rik Faith (faith@cs.unc.edu)
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.TH PUTS 3 2018-04-30 "GNU" "Linux Programmer's Manual"
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.SH NAME
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fputc, fputs, putc, putchar, puts \- output of characters and strings
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.SH SYNOPSIS
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.nf
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.B #include <stdio.h>
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.PP
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.BI "int fputc(int " c ", FILE *" stream );
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.PP
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.BI "int fputs(const char *" "s" ", FILE *" "stream" );
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.PP
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.BI "int putc(int " c ", FILE *" stream );
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.PP
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.BI "int putchar(int " c );
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.PP
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.BI "int puts(const char *" "s" );
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.fi
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.SH DESCRIPTION
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.BR fputc ()
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writes the character
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.IR c ,
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cast to an
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.IR "unsigned char" ,
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to
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.IR stream .
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.PP
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.BR fputs ()
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writes the string
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.I s
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to
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.IR stream ,
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without its terminating null byte (\(aq\e0\(aq).
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.PP
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.BR putc ()
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is equivalent to
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.BR fputc ()
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except that it may be implemented as a macro which evaluates
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.I stream
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more than once.
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.PP
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.BI "putchar(" c )
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is equivalent to
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.BI "putc(" c ", " stdout ) \fR.
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.PP
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.BR puts ()
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writes the string
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.I s
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and a trailing newline
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to
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.IR stdout .
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.PP
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Calls to the functions described here can be mixed with each other and with
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calls to other output functions from the
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.I stdio
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library for the same output stream.
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.PP
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For nonlocking counterparts, see
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.BR unlocked_stdio (3).
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.SH RETURN VALUE
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.BR fputc (),
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.BR putc ()
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and
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.BR putchar ()
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return the character written as an
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.I unsigned char
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cast to an
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.I int
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or
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.B EOF
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on error.
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.PP
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.BR puts ()
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and
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.BR fputs ()
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return a nonnegative number on success, or
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.B EOF
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on error.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lbw25 lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR fputc (),
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.BR fputs (),
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.BR putc (),
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.BR putchar (),
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.BR puts ()
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T} Thread safety MT-Safe
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.TE
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.SH CONFORMING TO
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POSIX.1-2001, POSIX.1-2008, C89, C99.
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.SH BUGS
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It is not advisable to mix calls to output functions from the
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.I stdio
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library with low-level calls to
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.BR write (2)
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for the file descriptor associated with the same output stream; the results
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will be undefined and very probably not what you want.
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.SH SEE ALSO
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.BR write (2),
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.BR ferror (3),
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.BR fgets (3),
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.BR fopen (3),
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.BR fputwc (3),
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.BR fputws (3),
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.BR fseek (3),
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.BR fwrite (3),
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.BR putwchar (3),
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.BR scanf (3),
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.BR unlocked_stdio (3)
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