{"id":65687,"date":"2026-01-25T15:56:38","date_gmt":"2026-01-25T07:56:38","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/65687.html"},"modified":"2026-01-25T15:56:38","modified_gmt":"2026-01-25T07:56:38","slug":"%e5%ba%93%e5%87%bd%e6%95%b0%e7%9a%84%e6%a8%a1%e6%8b%9f%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/65687.html","title":{"rendered":"\u5e93\u51fd\u6570\u7684\u6a21\u62df\u5b9e\u73b0"},"content":{"rendered":"<h3>\u4e00\u3001\u4e3a\u4ec0\u4e48\u8981\u6a21\u62df\u5b9e\u73b0\u5e93\u51fd\u6570<\/h3>\n<p>\u7406\u89e3\u5e95\u5c42\u539f\u7406&#xff1a;\u5e93\u51fd\u6570\u4e0d\u662f \u201c\u9ed1\u76d2\u5b50\u201d&#xff0c;\u6a21\u62df\u5b9e\u73b0\u80fd\u8ba9\u4f60\u771f\u6b63\u7406\u89e3\u5b83\u4eec\u7684\u5de5\u4f5c\u673a\u5236\u3002 \u9762\u8bd5\u9ad8\u9891\u8003\u70b9&#xff1a;memcpy\u3001memmove\u3001strcpy\u7b49\u51fd\u6570\u7684\u5b9e\u73b0\u662f C \u8bed\u8a00\u9762\u8bd5\u7684\u7ecf\u5178\u9898\u76ee\u3002 \u63d0\u5347\u7f16\u7801\u80fd\u529b&#xff1a;\u5904\u7406\u6307\u9488\u3001\u5185\u5b58\u3001\u8fb9\u754c\u6761\u4ef6\u7b49\u7ec6\u8282&#xff0c;\u80fd\u663e\u8457\u63d0\u5347\u4f60\u7684\u5e95\u5c42\u7f16\u7a0b\u529f\u5e95\u3002<\/p>\n<h3>\u4e8c\u3001\u9ad8\u9891\u5e93\u51fd\u6570\u6a21\u62df\u5b9e\u73b0<\/h3>\n<p>1&#xff1a;memcpy \u6838\u5fc3\u7279\u70b9&#xff1a;\u6309\u5b57\u8282\u590d\u5236&#xff0c;\u4e0d\u5904\u7406\u5185\u5b58\u91cd\u53e0\u3002<\/p>\n<p><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">my_memcpy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> dest<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> src<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> n<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> d <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>dest<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>src<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">*<\/span>d<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>s<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> dest<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u5982\u679c\u5185\u5b58\u533a\u57df\u91cd\u53e0&#xff0c;memcpy\u7684\u884c\u4e3a\u662f\u672a\u5b9a\u4e49\u7684&#xff0c;\u8fd9\u79cd\u573a\u666f\u9700\u8981\u4f7f\u7528memmove\u3002<\/p>\n<p>2. memmove \u2014\u2014 \u652f\u6301\u91cd\u53e0\u7684\u5185\u5b58\u590d\u5236 \u6838\u5fc3\u7279\u70b9&#xff1a;\u901a\u8fc7\u5224\u65ad\u5185\u5b58\u5730\u5740&#xff0c;\u9009\u62e9\u6b63\u5411 \/ \u53cd\u5411\u590d\u5236&#xff0c;\u5b89\u5168\u5904\u7406\u91cd\u53e0\u573a\u666f\u3002<\/p>\n<p><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">my_memmove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> dest<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> src<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> n<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>dest <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span> <span class=\"token operator\">&amp;&amp;<\/span> src <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> d <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>dest<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>src<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> start <span class=\"token operator\">&#061;<\/span> d<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>d <span class=\"token operator\">&lt;<\/span> s <span class=\"token operator\">||<\/span> d <span class=\"token operator\">&gt;&#061;<\/span> s <span class=\"token operator\">&#043;<\/span> n<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&#8212;<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token operator\">*<\/span>d<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>s<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><\/p>\n<p>        d <span class=\"token operator\">&#043;&#061;<\/span> n <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        s <span class=\"token operator\">&#043;&#061;<\/span> n <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>n<span class=\"token operator\">&#8212;<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token operator\">*<\/span>d<span class=\"token operator\">&#8212;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>s<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> start<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>3. strcpy \u2014\u2014 \u5b57\u7b26\u4e32\u590d\u5236 \u6838\u5fc3\u7279\u70b9&#xff1a;\u9047\u5230\u2019\\\\0\u2019\u505c\u6b62\u590d\u5236&#xff0c;\u5e76\u5c06\u2019\\\\0\u2019\u4e5f\u590d\u5236\u5230\u76ee\u6807\u5730\u5740<\/p>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">my_strcpy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> dest<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> src<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>dest <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span> <span class=\"token operator\">&amp;&amp;<\/span> src <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> start <span class=\"token operator\">&#061;<\/span> dest<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>src <span class=\"token operator\">!&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token operator\">*<\/span>dest<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>src<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token operator\">*<\/span>dest <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> start<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>4. strlen \u2014\u2014 \u5b57\u7b26\u4e32\u957f\u5ea6\u8ba1\u7b97 \u6838\u5fc3\u7279\u70b9&#xff1a;\u7edf\u8ba1\u5b57\u7b26\u6570&#xff0c;\u9047\u5230\u2019\\\\0\u2019\u505c\u6b62&#xff0c;\u4e0d\u5305\u542b\u2019\\\\0\u2019\u672c\u8eab\u3002<\/p>\n<p><span class=\"token class-name\">size_t<\/span> <span class=\"token function\">my_strlen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>str <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">size_t<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>str<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>5. strcmp \u2014\u2014 \u5b57\u7b26\u4e32\u6bd4\u8f83 \u6838\u5fc3\u7279\u70b9&#xff1a;\u6309 ASCII \u503c\u9010\u5b57\u7b26\u6bd4\u8f83&#xff0c;\u8fd4\u56de\u5dee\u503c\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">my_strcmp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str1<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str2<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>str1 <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span> <span class=\"token operator\">&amp;&amp;<\/span> str2 <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>str1 <span class=\"token operator\">!&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">*<\/span>str2 <span class=\"token operator\">!&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">*<\/span>str1 <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">*<\/span>str2<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        str1<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        str2<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">*<\/span>str1 <span class=\"token operator\">&#8211;<\/span> <span class=\"token operator\">*<\/span>str2<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u4e09\u3001\u6a21\u62df\u5b9e\u73b0\u7684\u901a\u7528\u6280\u5de7<\/h3>\n<p>\u6307\u9488\u6709\u6548\u6027\u68c0\u67e5&#xff1a;\u7528assert\u786e\u4fdd\u4f20\u5165\u7684\u6307\u9488\u4e0d\u662fNULL&#xff0c;\u63d0\u5347\u4ee3\u7801\u5065\u58ee\u6027\u3002 \u7c7b\u578b\u8f6c\u6362&#xff1a;\u5c06void\u8f6c\u6362\u4e3achar&#xff0c;\u5b9e\u73b0\u6309\u5b57\u8282\u64cd\u4f5c&#xff0c;\u517c\u5bb9\u4efb\u610f\u6570\u636e\u7c7b\u578b\u3002 \u4fdd\u5b58\u8d77\u59cb\u5730\u5740&#xff1a;\u590d\u5236\u76ee\u6807\u6307\u9488\u7684\u8d77\u59cb\u4f4d\u7f6e&#xff0c;\u6700\u540e\u8fd4\u56de\u5b83&#xff0c;\u4e0e\u6807\u51c6\u5e93\u884c\u4e3a\u4fdd\u6301\u4e00\u81f4\u3002 \u8fb9\u754c\u6761\u4ef6\u5904\u7406&#xff1a;\u6ce8\u610f\u2019\\\\0\u2019\u3001\u5185\u5b58\u91cd\u53e0\u3001\u7a7a\u8f93\u5165\u7b49\u8fb9\u754c\u573a\u666f&#xff0c;\u907f\u514d\u7a0b\u5e8f\u5d29\u6e83\u6216\u903b\u8f91\u9519\u8bef\u3002<\/p>\n<h3>\u56db\u3001\u603b\u7ed3<\/h3>\n<p>\u6a21\u62df\u5b9e\u73b0\u5e93\u51fd\u6570\u7684\u8fc7\u7a0b&#xff0c;\u5c31\u662f \u201c\u77e5\u5176\u7136&#xff0c;\u77e5\u5176\u6240\u4ee5\u7136\u201d 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