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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!-- This collection of hypertext pages is Copyright 1995-2005 by Steve Summit. --><!-- Content from the book "C Programming FAQs: Frequently Asked Questions" --><!-- (Addison-Wesley, 1995, ISBN 0-201-84519-9) is made available here by --><!-- permission of the author and the publisher as a service to the community. --><!-- It is intended to complement the use of the published text --><!-- and is protected by international copyright laws. --><!-- The on-line content may be accessed freely for personal use --><!-- but may not be published or retransmitted without explicit permission. --><!-- --><!-- this page built Sat Dec 24 21:47:46 2005 by faqproc version 2.7 --><!-- from source file stdio.sgml dated Wed Dec 21 13:07:57 2005 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/stdio/getsvsfgets.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:58 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 12.23</title><link href="sprintfret.html" rev=precedes><link href="printferrno.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="sprintfret.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="printferrno.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../index-2.html"><img src="../images/buttontop.gif" alt="top/contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><hr><p><!-- qbegin --><h1>comp.lang.c FAQ list<font color=blue>·</font><!-- qtag -->Question 12.23</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>Why does everyone say not to use <TT>gets()</TT>?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>Unlike <TT>fgets()</TT>,<TT>gets()</TT>cannot be told the size of the buffer it's to read into,so itcannot be prevented from overflowingthatbufferif an input line is longer than expected--andMurphy's Law says that,sooner orlater,a larger-than-expected input line <em>will</em> occur.<a href="rtmworm.html" rel=subdocument>[footnote]</a>(It's possible to convince yourself that,for some reason or another,input lines longer than some maximum are impossible,but it's also possible to bemistaken,<a href="oslinelen.html" rel=subdocument>[footnote]</a>and in any case it's justas easy to use <TT>fgets</TT>.)</p><p>The Standard <TT>fgets</TT> functionis a vast improvement over <TT>gets()</TT>,although it's not perfect, either.(If long lines are a real possibility,their proper handling must be carefully considered.)</p><p>One other difference between <TT>fgets()</TT> and <TT>gets()</TT>is that <TT>fgets()</TT> retains the <TT>'\n'</TT>,but it is straightforward to strip it out.See question<a href="../malloc/malloc1.html">7.1</a> for a code fragment illustratingthe replacement of <TT>gets()</TT> with <TT>fgets()</TT>.</p><p>References:Rationale Sec. 4.9.7.2<br>H&S Sec. 15.7 p. 356<br></p><!-- aend --><p><hr><a href="sprintfret.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="printferrno.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../questions.html"><img src="../images/buttontop.gif" alt="contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><br><!-- lastfooter --><a href="../about.html">about this FAQ list</a> <a href="../eskimo.html">about eskimo</a> <a href="../search.html">search</a> <a href="../feedback.html">feedback</a> <a href="copyright.html">copyright</a><p>Hosted by<a href="http://www.eskimo.com/"><img src="../../www.eskimo.com/img/link/eskitiny.gif" alt="Eskimo North"></a></body><!-- Mirrored from c-faq.com/stdio/getsvsfgets.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:58 GMT --></html>⌨️ 快捷键说明
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