📄 strcpy.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>strcpy</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="strcpy"></a> <a name="tag_03_724"></a><!-- strcpy --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_724_01"></a>NAME</h4><blockquote>strcpy - copy a string</blockquote><h4><a name="tag_03_724_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/string.h.html">string.h</a>><br><br> char *strcpy(char *restrict</tt> <i>s1</i><tt>, const char *restrict</tt> <i>s2</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_724_03"></a>DESCRIPTION</h4><blockquote><div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between therequirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers tothe ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div><p>The <i>strcpy</i>() function shall copy the string pointed to by <i>s2</i> (including the terminating null byte) into the arraypointed to by <i>s1</i>. If copying takes place between objects that overlap, the behavior is undefined.</p></blockquote><h4><a name="tag_03_724_04"></a>RETURN VALUE</h4><blockquote><p>The <i>strcpy</i>() function shall return <i>s1</i>; no return value is reserved to indicate an error.</p></blockquote><h4><a name="tag_03_724_05"></a>ERRORS</h4><blockquote><p>No errors are defined.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_724_06"></a>EXAMPLES</h4><blockquote><h5><a name="tag_03_724_06_01"></a>Initializing a String</h5><p>The following example copies the string <tt>"----------"</tt> into the <i>permstring</i> variable.</p><pre><tt>#include <string.h>...static char permstring[11];...strcpy(permstring, "----------");...</tt></pre><h5><a name="tag_03_724_06_02"></a>Storing a Key and Data</h5><p>The following example allocates space for a key using <a href="../functions/malloc.html"><i>malloc</i>()</a> then uses<i>strcpy</i>() to place the key there. Then it allocates space for data using <a href="../functions/malloc.html"><i>malloc</i>()</a>, and uses <i>strcpy</i>() to place data there. (The user-defined function<i>dbfree</i>() frees memory previously allocated to an array of type <b>struct element *</b>.)</p><pre><tt>#include <string.h>#include <stdlib.h>#include <stdio.h>.../* Structure used to read data and store it. */struct element { char *key; char *data;};<br>struct element *tbl, *curtbl;char *key, *data;int count;...void dbfree(struct element *, int);...if ((curtbl->key = malloc(strlen(key) + 1)) == NULL) { perror("malloc"); dbfree(tbl, count); return NULL;}strcpy(curtbl->key, key);<br>if ((curtbl->data = malloc(strlen(data) + 1)) == NULL) { perror("malloc"); free(curtbl->key); dbfree(tbl, count); return NULL;}strcpy(curtbl->data, data);...</tt></pre></blockquote><h4><a name="tag_03_724_07"></a>APPLICATION USAGE</h4><blockquote><p>Character movement is performed differently in different implementations. Thus, overlapping moves may yield surprises.</p><p>This issue is aligned with the ISO C standard; this does not affect compatibility with XPG3 applications. Reliable errordetection by this function was never guaranteed.</p></blockquote><h4><a name="tag_03_724_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_724_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_724_10"></a>SEE ALSO</h4><blockquote><p><a href="strncpy.html"><i>strncpy</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/string.h.html"><i><string.h></i></a></p></blockquote><h4><a name="tag_03_724_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_03_724_12"></a>Issue 6</h4><blockquote><p>The <i>strcpy</i>() prototype is updated for alignment with the ISO/IEC 9899:1999 standard.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -