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<!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><string.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="<string.h>"></a> <a name="tag_13_51"></a><!-- <string.h> --> <!--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_13_51_01"></a>NAME</h4><blockquote>string.h - string operations</blockquote><h4><a name="tag_13_51_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><tt>#include <string.h></tt></p></blockquote><h4><a name="tag_13_51_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"> Some of the functionality described on this reference page extends the ISO C standard. Applications shall definethe appropriate feature test macro (see the System Interfaces volume of IEEE Std 1003.1-2001, <a href="../functions/xsh_chap02_02.html">Section 2.2, The Compilation Environment</a>) to enable the visibility of these symbols in thisheader. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div><p>The <i><string.h></i> header shall define the following:</p><dl compact><dt>NULL</dt><dd>Null pointer constant.</dd><dt><b>size_t</b></dt><dd>As described in <a href="stddef.h.html"><i><stddef.h></i></a> .</dd></dl><p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p><pre><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">void *memccpy(void *restrict, const void *restrict, int, size_t);<img src="../images/opt-end.gif" alt="[Option End]" border="0">void *memchr(const void *, int, size_t);int memcmp(const void *, const void *, size_t);void *memcpy(void *restrict, const void *restrict, size_t);void *memmove(void *, const void *, size_t);void *memset(void *, int, size_t);char *strcat(char *restrict, const char *restrict);char *strchr(const char *, int);int strcmp(const char *, const char *);int strcoll(const char *, const char *);char *strcpy(char *restrict, const char *restrict);size_t strcspn(const char *, const char *);<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">char *strdup(const char *);<img src="../images/opt-end.gif" alt="[Option End]" border="0">char *strerror(int);<sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">int *strerror_r(int, char *, size_t);<img src="../images/opt-end.gif" alt="[Option End]" border="0">size_t strlen(const char *);char *strncat(char *restrict, const char *restrict, size_t);int strncmp(const char *, const char *, size_t);char *strncpy(char *restrict, const char *restrict, size_t);char *strpbrk(const char *, const char *);char *strrchr(const char *, int);size_t strspn(const char *, const char *);char *strstr(const char *, const char *);char *strtok(char *restrict, const char *restrict);<sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">char *strtok_r(char *, const char *, char **);<img src="../images/opt-end.gif" alt="[Option End]" border="0">size_t strxfrm(char *restrict, const char *restrict, size_t);</tt></pre><p><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">Inclusion of the <i><string.h></i> header may also make visible all symbols from <a href="../basedefs/stddef.h.html"><i><stddef.h></i></a>. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_51_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_51_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_51_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_51_07"></a>SEE ALSO</h4><blockquote><p><a href="stddef.h.html"><i><stddef.h></i></a> , <a href="sys/types.h.html"><i><sys/types.h></i></a> , the SystemInterfaces volume of IEEE Std 1003.1-2001, <a href="../functions/memccpy.html"><i>memccpy</i>()</a>, <a href="../functions/memchr.html"><i>memchr</i>()</a>, <a href="../functions/memcmp.html"><i>memcmp</i>()</a>, <a href="../functions/memcpy.html"><i>memcpy</i>()</a>, <a href="../functions/memmove.html"><i>memmove</i>()</a>, <a href="../functions/memset.html"><i>memset</i>()</a>, <a href="../functions/strcat.html"><i>strcat</i>()</a>, <a href="../functions/strchr.html"><i>strchr</i>()</a>, <a href="../functions/strcmp.html"><i>strcmp</i>()</a>, <a href="../functions/strcoll.html"><i>strcoll</i>()</a>, <a href="../functions/strcpy.html"><i>strcpy</i>()</a>, <a href="../functions/strcspn.html"><i>strcspn</i>()</a>, <a href="../functions/strdup.html"><i>strdup</i>()</a>, <a href="../functions/strerror.html"><i>strerror</i>()</a>, <a href="../functions/strlen.html"><i>strlen</i>()</a>, <a href="../functions/strncat.html"><i>strncat</i>()</a>, <a href="../functions/strncmp.html"><i>strncmp</i>()</a>, <a href="../functions/strncpy.html"><i>strncpy</i>()</a>, <a href="../functions/strpbrk.html"><i>strpbrk</i>()</a>, <a href="../functions/strrchr.html"><i>strrchr</i>()</a>, <a href="../functions/strspn.html"><i>strspn</i>()</a>, <a href="../functions/strstr.html"><i>strstr</i>()</a>, <a href="../functions/strtok.html"><i>strtok</i>()</a>, <a href="../functions/strxfrm.html"><i>strxfrm</i>()</a></p></blockquote><h4><a name="tag_13_51_08"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_13_51_09"></a>Issue 5</h4><blockquote><p>The DESCRIPTION is updated for alignment with the POSIX Threads Extension.</p></blockquote><h4><a name="tag_13_51_10"></a>Issue 6</h4><blockquote><p>The <a href="../functions/strtok_r.html"><i>strtok_r</i>()</a> function is marked as part of the Thread-Safe Functionsoption.</p><p>This reference page is updated to align with the ISO/IEC 9899:1999 standard.</p><p>The <a href="../functions/strerror_r.html"><i>strerror_r</i>()</a> function is added in response to IEEE PASC Interpretation1003.1c #39.</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
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