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authorTobias Klauser <tklauser@distanz.ch>2008-01-27 11:37:44 +0100
committerTobias Klauser <tklauser@xenon.tklauser.home>2008-01-27 11:37:44 +0100
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+<title>strcpy function</title>
+
+<head>
+<script language="JavaScript">
+</script>
+</head>
+
+<body bgcolor="#ffffcc">
+<hr>
+<center>
+<h1>strcpy function</h1>
+</center>
+<hr>
+<p>
+<b>strcpy</b> copies a string. This function will copy the bytes
+stored at the location pointed to by 's2' to the location pointed to by 's1'.
+
+<pre>
+
+ s1 s2
+ | |
+ V V
+ - - - - - - - --
+ | | | | | |a|b|c|\0|
+ - - - - - - - --
+ ^ ^ | |
+ | | | |
+ -|------------- |
+ ---------------
+</pre>
+
+<hr>
+<pre>
+Library: string.h
+
+Prototype: char strcpy(char *s1, const char *s2);
+
+Syntax:
+ char string2[20]="red dwarf";
+ char string1[20]="";
+ strcpy(string1, string2);
+</pre>
+
+<hr>
+
+<h2>Notes</h2>
+
+Dont forget that strings are terminated with a
+'<a href="../SYNTAX/null.html">\0</a>' so allow space for it...
+<p>
+There is another way to code the example above. Consider this piece of
+code.
+<pre>
+ main()
+ {
+ char *string2="red dwarf";
+ char *string1;
+
+ string1=string2;
+ }
+</pre>
+
+'string2' is now a character pointer (only one byte) that points to a
+storage location containing "red dwarf" (a
+<a href="../CONCEPT/constants.html#str">string constant</a>). So
+<b>string1=string2;</b> copies the address of "red dwarf" into
+'string1'. This version of the code will execute quicker than strcpy
+because less data is being moved around the system.
+
+
+<hr>
+<img src="../../GRAPHICS/computer.gif">
+<a href="../EXAMPLES/strcpy.c">example program.</a>
+<hr>
+
+<h2>See also:</h2>
+
+<img src="../../GRAPHICS/whiteball.gif">
+<a href="strtok.html">strtok</a>
+<br>
+
+<img src="../../GRAPHICS/whiteball.gif">
+<a href="strncpy.html">strncpy</a>
+<br>
+
+<img src="../../GRAPHICS/whiteball.gif">
+<a href="sprintf.html">sprintf</a>
+<br>
+
+<img src="../../GRAPHICS/man.gif">
+<a href="../MAN/strcat.htm"><i>strcat</a>
+<br>
+
+<img src="../../GRAPHICS/whiteball.gif">
+<a href="../CONCEPT/string.html">strings</a>
+<br>
+
+<img src="../../GRAPHICS/whiteball.gif">
+<a href="memcpy.htm">memcpy</a> Copy data between tow memory locations.
+<p>
+
+
+<p>
+
+<hr>
+<p>
+<center>
+<table border=2 width="80%" bgcolor="ivory">
+<tr align=center>
+<td width="25%">
+<a href="../cref.html"> Top</a>
+</td><td width="25%">
+<a href="../master_index.html"> Master Index</a>
+</td><td width="25%">
+<a href="../SYNTAX/keywords.html"> Keywords</a>
+</td><td width="25%">
+<a href="funcref.htm"> Functions</a>
+</td>
+</tr>
+</table>
+</center>
+<p>
+<hr>
+<address>Martin Leslie
+</address><p>
+</body>
+</html>