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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title><string.h></title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_009_111"> </a>NAME</h4><blockquote>string.h - string operations</blockquote><h4><a name = "tag_000_009_112"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <string.h></code></pre></blockquote><h4><a name = "tag_000_009_113"> </a>DESCRIPTION</h4><blockquote>The <<b>string.h</b>> header defines the following:<dl compact><dt>NULL<dd>Null pointer constant.<dt><b>size_t</b><dd>As described in<i><a href="stddef.h.html"><stddef.h></a></i>.</dl><p>The following are declared as functions and may also be definedas macros.Function prototypes must be provided for use with an ISO Ccompiler.<pre><code>void *<a href="memccpy.html">memccpy</a>(void *, const void *, int, size_t);void *<a href="memchr.html">memchr</a>(const void *, int, size_t);int <a href="memcmp.html">memcmp</a>(const void *, const void *, size_t);void *<a href="memcpy.html">memcpy</a>(void *, const void *, size_t);void *<a href="memmove.html">memmove</a>(void *, const void *, size_t);void *<a href="memset.html">memset</a>(void *, int, size_t);char *<a href="strcat.html">strcat</a>(char *, const char *);char *<a href="strchr.html">strchr</a>(const char *, int);int <a href="strcmp.html">strcmp</a>(const char *, const char *);int <a href="strcoll.html">strcoll</a>(const char *, const char *);char *<a href="strcpy.html">strcpy</a>(char *, const char *);size_t <a href="strcspn.html">strcspn</a>(const char *, const char *);char *<a href="strdup.html">strdup</a>(const char *);char *<a href="strerror.html">strerror</a>(int);size_t <a href="strlen.html">strlen</a>(const char *);char *<a href="strncat.html">strncat</a>(char *, const char *, size_t);int <a href="strncmp.html">strncmp</a>(const char *, const char *, size_t);char *<a href="strncpy.html">strncpy</a>(char *, const char *, size_t);char *<a href="strpbrk.html">strpbrk</a>(const char *, const char *);char *<a href="strrchr.html">strrchr</a>(const char *, int);size_t <a href="strspn.html">strspn</a>(const char *, const char *);char *<a href="strstr.html">strstr</a>(const char *, const char *);char *<a href="strtok.html">strtok</a>(char *, const char *);char *<a href="strtok_r.html">strtok_r</a>(char *, const char *, char **);size_t <a href="strxfrm.html">strxfrm</a>(char *, const char *, size_t);</code></pre><p>Inclusion of the<i><string.h></i>header may also make visible all symbols from<i><a href="stddef.h.html"><stddef.h></a></i>.</blockquote><h4><a name = "tag_000_009_114"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_115"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_116"> </a>SEE ALSO</h4><blockquote><i><a href="memccpy.html">memccpy()</a></i>,<i><a href="memchr.html">memchr()</a></i>,<i><a href="memcmp.html">memcmp()</a></i>,<i><a href="memcpy.html">memcpy()</a></i>,<i><a href="memmove.html">memmove()</a></i>,<i><a href="memset.html">memset()</a></i>,<i><a href="strcat.html">strcat()</a></i>,<i><a href="strchr.html">strchr()</a></i>,<i><a href="strcmp.html">strcmp()</a></i>,<i><a href="strcoll.html">strcoll()</a></i>,<i><a href="strcpy.html">strcpy()</a></i>,<i><a href="strcspn.html">strcspn()</a></i>,<i><a href="strdup.html">strdup()</a></i>,<i><a href="strerror.html">strerror()</a></i>,<i><a href="strlen.html">strlen()</a></i>,<i><a href="strncat.html">strncat()</a></i>,<i><a href="strncmp.html">strncmp()</a></i>,<i><a href="strncpy.html">strncpy()</a></i>,<i><a href="strpbrk.html">strpbrk()</a></i>,<i><a href="strrchr.html">strrchr()</a></i>,<i><a href="strspn.html">strspn()</a></i>,<i><a href="strstr.html">strstr()</a></i>,<i><a href="strtok.html">strtok()</a></i>,<i><a href="strxfrm.html">strxfrm()</a></i>,<i><a href="systypes.h.html"><sys/types.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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