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+.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\" 
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\" 
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\" License.
+.\" Modified Wed Jul 28 11:12:07 1993 by Rik Faith (faith@cs.unc.edu)
+.\" Modified Fri Sep  8 15:48:13 1995 by Andries Brouwer (aeb@cwi.nl)
+.TH GETS 3  1993-04-04 "GNU" "Linux Programmer's Manual"
+.SH NAME
+fgetc, fgets, getc, getchar, gets, ungetc \- input of characters and strings
+.SH SYNOPSIS
+.nf
+.B #include <stdio.h>
+.sp
+.BI "int fgetc(FILE *" stream );
+.nl
+.BI "char *fgets(char *" "s" ", int " "size" ", FILE *" "stream" );
+.nl
+.BI "int getc(FILE *" stream );
+.nl
+.BI "int getchar(void);"
+.nl
+.BI "char *gets(char *" "s" );
+.nl
+.BI "int ungetc(int " c ", FILE *" stream );
+.SH DESCRIPTION
+.B fgetc()
+reads the next character from
+.I stream 
+and returns it as an
+.B unsigned char
+cast to an
+.BR int ,
+or
+.B EOF
+on end of file or error.
+.PP
+.B getc()
+is equivalent to
+.B fgetc()
+except that it may be implemented as a macro which evaluates
+.I stream
+more than once.
+.PP
+.B getchar()
+is equivalent to
+.BI "getc(" stdin ) \fR.
+.PP
+.BR gets() " reads"
+a line from
+.I stdin
+into the buffer pointed to by
+.I s
+until either a terminating newline or
+.BR EOF ,
+which it replaces with
+.BR '\e0' .
+No check for buffer overrun is performed (see
+.B BUGS
+below).
+.PP
+.B fgets()
+reads in at most one less than
+.I size
+characters from
+.I stream
+and stores them into the buffer pointed to by
+.IR s .
+Reading stops after an
+.B EOF
+or a newline.  If a newline is read, it is stored into the buffer.  A  
+.B '\e0'
+is stored after the last character in the buffer.
+.PP
+.B ungetc()
+pushes
+.I c
+back to
+.IR stream ,
+cast to
+.BR "unsigned char" ,
+where it is available for subsequent read operations.  Pushed - back characters
+will be returned in reverse order; only one pushback is guaranteed.
+.PP
+Calls to the functions described here can be mixed with each other and with
+calls to other input functions from the
+.B stdio
+library for the same input stream.
+.PP
+For non-locking counterparts, see
+.BR unlocked_stdio (3).
+.SH "RETURN VALUE"
+.BR fgetc() , " getc() " and " getchar()"
+return the character read as an
+.B unsigned char
+cast to an
+.B int
+or
+.B EOF
+on end of file or error.
+.PP
+.BR gets() " and " fgets()
+return
+.I s
+on success, and
+.B NULL
+on error or when end of file occurs while no characters have been read.
+.PP
+.B ungetc()
+returns 
+.I c
+on success, or
+.B EOF
+on error.
+.SH "CONFORMING TO"
+ANSI - C, POSIX.1.
+LSB deprecates
+.BR gets() .
+.SH BUGS
+Never use
+.BR gets() .
+Because it is impossible to tell without knowing the data in advance how many
+characters
+.B gets()
+will read, and because
+.B gets()
+will continue to store characters past the end of the buffer, it is extremely
+dangerous to use.  It has been used to break computer security.  Use 
+.B fgets()
+instead.
+.PP
+It is not advisable to mix calls to input functions from the
+.B stdio
+library with low - level calls to
+.B read() 
+for the file descriptor associated with the input stream; the results
+will be undefined and very probably not what you want.
+.SH "SEE ALSO"
+.BR read (2),
+.BR write (2),
+.BR ferror (3),
+.BR fopen (3),
+.BR fread (3),
+.BR fseek (3),
+.BR puts (3),
+.BR scanf (3),
+.BR unlocked_stdio (3)