2004-11-03 13:51:07 +00:00
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.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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2007-06-20 22:33:04 +00:00
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.TH "GETS" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.\" gets
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2007-09-20 06:03:25 +00:00
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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2004-11-03 13:51:07 +00:00
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.SH NAME
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gets \- get a string from a stdin stream
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.SH SYNOPSIS
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.LP
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\fB#include <stdio.h>
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.br
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.sp
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char *gets(char *\fP\fIs\fP\fB);
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIgets\fP() function shall read bytes from the standard input
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stream, \fIstdin\fP, into the array pointed to by \fIs\fP,
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until a <newline> is read or an end-of-file condition is encountered.
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Any <newline> shall be discarded and a null byte
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shall be placed immediately after the last byte read into the array.
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.LP
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The
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\fIgets\fP() function may mark the \fIst_atime\fP field of the file
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associated with \fIstream\fP for update. The \fIst_atime\fP
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field shall be marked for update by the first successful execution
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of \fIfgetc\fP(), \fIfgets\fP(), \fIfread\fP(), \fIgetc\fP(), \fIgetchar\fP(),
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\fIgets\fP(), \fIfscanf\fP(), or \fIscanf\fP() using \fIstream\fP
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that
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returns data not supplied by a prior call to \fIungetc\fP().
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.SH RETURN VALUE
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.LP
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Upon successful completion, \fIgets\fP() shall return \fIs\fP. If
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the stream is at end-of-file, the end-of-file indicator for
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the stream shall be set and \fIgets\fP() shall return a null pointer.
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If a read error occurs, the error indicator for the stream
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shall be set, \fIgets\fP() shall return a null pointer, and set
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\fIerrno\fP to indicate the error.
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.SH ERRORS
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.LP
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2007-11-18 06:25:23 +00:00
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Refer to \fIfgetc\fP().
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2004-11-03 13:51:07 +00:00
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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Reading a line that overflows the array pointed to by \fIs\fP results
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in undefined behavior. The use of \fIfgets\fP() is recommended.
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.LP
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Since the user cannot specify the length of the buffer passed to \fIgets\fP(),
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use of this function is discouraged. The length
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of the string read is unlimited. It is possible to overflow this buffer
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in such a way as to cause applications to fail, or possible
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system security violations.
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.LP
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It is recommended that the \fIfgets\fP() function should be used to
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read input lines.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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2007-09-20 06:12:53 +00:00
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\fIfeof\fP(), \fIferror\fP(), \fIfgets\fP(),
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2004-11-03 13:51:07 +00:00
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the Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<stdio.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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