173 lines
5.5 KiB
HTML
173 lines
5.5 KiB
HTML
<!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 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 1003.1-2001<br>
|
|
Copyright © 2001 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 the
|
|
requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
|
|
the 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 array
|
|
pointed 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 error
|
|
detection 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>
|
|
|