{"id":53038,"date":"2025-08-11T23:24:28","date_gmt":"2025-08-11T15:24:28","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/53038.html"},"modified":"2025-08-11T23:24:28","modified_gmt":"2025-08-11T15:24:28","slug":"c%e8%af%ad%e8%a8%80%e5%88%9d%e5%ad%a6%e8%80%85%e7%ac%94%e8%ae%b0%e3%80%90%e5%ad%97%e7%ac%a6%e5%87%bd%e6%95%b0%e4%b8%8e%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b0%e3%80%91","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/53038.html","title":{"rendered":"C\u8bed\u8a00\u521d\u5b66\u8005\u7b14\u8bb0\u3010\u5b57\u7b26\u51fd\u6570\u4e0e\u5b57\u7b26\u4e32\u51fd\u6570\u3011"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>\u4e00\u3001\u5b57\u7b26\u5206\u7c7b\u51fd\u6570<\/li>\n<li>\u4e8c\u3001\u5b57\u7b26\u8f6c\u6362\u51fd\u6570<\/li>\n<li>\u4e09\u3001\u5b57\u7b26\u4e32\u64cd\u4f5c\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>1. &#096;strlen&#096; &#8211; \u8ba1\u7b97\u5b57\u7b26\u4e32\u957f\u5ea6<\/li>\n<li>2. &#096;strcpy&#096; &#8211; \u5b57\u7b26\u4e32\u62f7\u8d1d<\/li>\n<li>3. &#096;strcat&#096; &#8211; \u5b57\u7b26\u4e32\u8ffd\u52a0<\/li>\n<li>4. &#096;strcmp&#096; &#8211; \u5b57\u7b26\u4e32\u6bd4\u8f83<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u5b89\u5168\u957f\u5ea6\u9650\u5236\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>1. &#096;strncpy&#096; &#8211; \u9650\u5b9a\u957f\u5ea6\u62f7\u8d1d<\/li>\n<li>2. &#096;strncat&#096; &#8211; \u9650\u5b9a\u957f\u5ea6\u8ffd\u52a0<\/li>\n<li>3. &#096;strncmp&#096; &#8211; \u9650\u5b9a\u957f\u5ea6\u6bd4\u8f83<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u9ad8\u7ea7\u5b57\u7b26\u4e32\u64cd\u4f5c<\/li>\n<li>\n<ul>\n<li>1. &#096;strstr&#096; &#8211; \u67e5\u627e\u5b50\u4e32<\/li>\n<li>2. &#096;strtok&#096; &#8211; \u5b57\u7b26\u4e32\u5206\u5272<\/li>\n<li>3. &#096;strerror&#096; &amp; &#096;perror&#096; &#8211; \u9519\u8bef\u4fe1\u606f<\/li>\n<\/ul>\n<\/li>\n<li>\u5173\u952e\u6ce8\u610f\u4e8b\u9879<\/li>\n<\/ul>\n<hr \/>\n<h2>\u524d\u8a00<\/h2>\n<p>C\u8bed\u8a00\u5b57\u7b26\u4e0e\u5b57\u7b26\u4e32\u51fd\u6570\u8be6\u89e3 \u5934\u6587\u4ef6\u4f9d\u8d56&#xff1a;&lt;ctype.h&gt;&#xff08;\u5b57\u7b26\u5904\u7406&#xff09;\u3001&lt;string.h&gt;&#xff08;\u5b57\u7b26\u4e32\u64cd\u4f5c&#xff09;\u3001&lt;errno.h&gt;&#xff08;\u9519\u8bef\u7801&#xff09;<\/p>\n<hr \/>\n<h2>\u4e00\u3001\u5b57\u7b26\u5206\u7c7b\u51fd\u6570<\/h2>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">isxxx<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8fd4\u56de\u975e0\u8868\u793a\u7b26\u5408\u6761\u4ef6&#xff0c;0\u4e0d\u7b26\u5408<\/span><\/p>\n<table>\n<tr>\u51fd\u6570\u529f\u80fd\u63cf\u8ff0<\/tr>\n<tbody>\n<tr>\n<td>iscntrl<\/td>\n<td>\u68c0\u67e5\u662f\u5426\u4e3a\u63a7\u5236\u5b57\u7b26<\/td>\n<\/tr>\n<tr>\n<td>isspace<\/td>\n<td>\u7a7a\u767d\u5b57\u7b26&#xff08;\u7a7a\u683c\u3001\\\\n\u3001\\\\t\u7b49&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>isdigit<\/td>\n<td>\u5341\u8fdb\u5236\u6570\u5b57&#xff08;0-9&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>isxdigit<\/td>\n<td>\u5341\u516d\u8fdb\u5236\u6570\u5b57&#xff08;0-9\u3001a-f\u3001A-F&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>islower<\/td>\n<td>\u5c0f\u5199\u5b57\u6bcd&#xff08;a-z&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>isupper<\/td>\n<td>\u5927\u5199\u5b57\u6bcd&#xff08;A-Z&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>isalpha<\/td>\n<td>\u5b57\u6bcd&#xff08;a-z \u6216 A-Z&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>isalnum<\/td>\n<td>\u5b57\u6bcd\u6216\u6570\u5b57<\/td>\n<\/tr>\n<tr>\n<td>ispunct<\/td>\n<td>\u6807\u70b9\u7b26\u53f7&#xff08;\u975e\u6570\u5b57\/\u5b57\u6bcd\u7684\u53ef\u6253\u5370\u5b57\u7b26&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>isgraph<\/td>\n<td>\u4efb\u4f55\u56fe\u5f62\u5b57\u7b26<\/td>\n<\/tr>\n<tr>\n<td>isprint<\/td>\n<td>\u4efb\u4f55\u53ef\u6253\u5370\u5b57\u7b26&#xff08;\u542b\u7a7a\u683c&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>\u4e8c\u3001\u5b57\u7b26\u8f6c\u6362\u51fd\u6570<\/h2>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">tolower<\/span> <span class=\"token punctuation\">(<\/span> <span class=\"token keyword\">int<\/span> c <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u5c06\u53c2\u6570\u4f20\u8fdb\u53bb\u7684\u2f24\u5199\u5b57\u2e9f\u8f6c\u2f29\u5199  <\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">toupper<\/span> <span class=\"token punctuation\">(<\/span> <span class=\"token keyword\">int<\/span> c <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u5c06\u53c2\u6570\u4f20\u8fdb\u53bb\u7684\u2f29\u5199\u5b57\u2e9f\u8f6c\u2f24\u5199 <\/span><\/p>\n<p>\u793a\u4f8b&#xff1a;\u5c0f\u5199\u8f6c\u5927\u5199<\/p>\n<p><span class=\"token keyword\">char<\/span> str<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Test String.\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> str<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">islower<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        str<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">toupper<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u76f4\u63a5\u4f7f\u7528\u8f6c\u6362\u51fd\u6570<\/span><br \/>\n    <span class=\"token function\">putchar<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h2>\u4e09\u3001\u5b57\u7b26\u4e32\u64cd\u4f5c\u51fd\u6570<\/h2>\n<h3>1. strlen &#8211; \u8ba1\u7b97\u5b57\u7b26\u4e32\u957f\u5ea6<\/h3>\n<p><span class=\"token class-name\">size_t<\/span> <span class=\"token function\">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><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u5173\u952e\u70b9&#xff1a;\n<ul>\n<li>\u8fd4\u56de \\\\0 \u524d\u7684\u5b57\u7b26\u6570&#xff08;\u4e0d\u5305\u542b \\\\0&#xff09;\u3002<\/li>\n<li>\u8fd4\u56de\u503c\u7c7b\u578b size_t&#xff08;\u65e0\u7b26\u53f7\u6574\u578b&#xff09;&#xff0c;\u907f\u514d\u76f4\u63a5\u7528\u4e8e\u5e26\u7b26\u53f7\u8fd0\u7b97&#xff08;\u5982 strlen(s1) &#8211; strlen(s2) &gt; 0 \u53ef\u80fd\u6052\u6210\u7acb&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u6a21\u62df\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u8ba1\u6570\u5668\u65b9\u5f0f<\/span><br \/>\n<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> <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><br \/>\n    <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 punctuation\">)<\/span> count<span class=\"token operator\">&#043;&#043;<\/span><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><span class=\"token comment\">\/\/ \u9012\u5f52\u65b9\u5f0f<\/span><br \/>\n<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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>str <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token function\">my_strlen<\/span><span class=\"token punctuation\">(<\/span>str <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>2. strcpy &#8211; \u5b57\u7b26\u4e32\u62f7\u8d1d<\/h3>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">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><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u89c4\u5219&#xff1a;\n<ul>\n<li>\u6e90\u5b57\u7b26\u4e32\u5fc5\u987b\u4ee5 \\\\0 \u7ed3\u675f\u3002<\/li>\n<li>\u76ee\u6807\u7a7a\u95f4\u9700\u8db3\u591f\u5927\u3001\u53ef\u4fee\u6539\u3002<\/li>\n<li>\u4f1a\u62f7\u8d1d \\\\0 \u5230\u76ee\u6807\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u6a21\u62df\u5b9e\u73b0&#xff1a;<\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> ret <span class=\"token operator\">&#061;<\/span> dest<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><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><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5305\u542b&#039;\\\\0&#039;\u7684\u62f7\u8d1d<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> ret<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>3. strcat &#8211; \u5b57\u7b26\u4e32\u8ffd\u52a0<\/h3>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">strcat<\/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><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u89c4\u5219&#xff1a;\n<ul>\n<li>\u6e90\/\u76ee\u6807\u5b57\u7b26\u4e32\u5747\u9700\u4ee5 \\\\0 \u7ed3\u675f\u3002<\/li>\n<li>\u76ee\u6807\u7a7a\u95f4\u9700\u8db3\u591f\u5bb9\u7eb3\u5408\u5e76\u540e\u7684\u5185\u5bb9\u3002<\/li>\n<li>\u4e0d\u53ef\u81ea\u8ffd\u52a0&#xff08;strcat(s, s) \u4f1a\u5bfc\u81f4\u6b7b\u5faa\u73af&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u6a21\u62df\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">my_strcat<\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> ret <span class=\"token operator\">&#061;<\/span> dest<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>dest<span class=\"token punctuation\">)<\/span> dest<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u627e\u5230\u76ee\u6807\u5b57\u7b26\u4e32\u7ed3\u5c3e<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><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><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u8ffd\u52a0\u6e90\u5b57\u7b26\u4e32<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> ret<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>4. strcmp &#8211; \u5b57\u7b26\u4e32\u6bd4\u8f83<\/h3>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">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><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<ul>\n<li>&gt;0&#xff1a;str1 &gt; str2<\/li>\n<li>&#061;0&#xff1a;\u76f8\u7b49<\/li>\n<li>&lt;0&#xff1a;str1 &lt; str2<\/li>\n<\/ul>\n<\/li>\n<li>\u6bd4\u8f83\u89c4\u5219&#xff1a;\u6309\u5b57\u7b26ASCII\u7801\u9010\u4f4d\u6bd4\u8f83\u3002<\/li>\n<\/ul>\n<p>\u6a21\u62df\u5b9e\u73b0&#xff1a;<\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>str1 <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        str1<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> str2<span class=\"token operator\">&#043;&#043;<\/span><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>  <span class=\"token comment\">\/\/ \u8fd4\u56de\u5dee\u503c<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h2>\u56db\u3001\u5b89\u5168\u957f\u5ea6\u9650\u5236\u51fd\u6570<\/h2>\n<h3>1. strncpy &#8211; \u9650\u5b9a\u957f\u5ea6\u62f7\u8d1d<\/h3>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">strncpy<\/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> <span class=\"token class-name\">size_t<\/span> num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u7279\u70b9&#xff1a;\n<ul>\n<li>\u82e5 src \u957f\u5ea6 &lt; num&#xff0c;\u5269\u4f59\u7a7a\u95f4\u8865 \\\\0\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>2. strncat &#8211; \u9650\u5b9a\u957f\u5ea6\u8ffd\u52a0<\/h3>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">strncat<\/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> <span class=\"token class-name\">size_t<\/span> num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u7279\u70b9&#xff1a;\n<ul>\n<li>\u8ffd\u52a0\u540e\u81ea\u52a8\u6dfb\u52a0 \\\\0\u3002<\/li>\n<li>\u6700\u591a\u8ffd\u52a0 num \u4e2a\u5b57\u7b26&#xff08;\u542b \\\\0&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>3. strncmp &#8211; \u9650\u5b9a\u957f\u5ea6\u6bd4\u8f83<\/h3>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">strncmp<\/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> <span class=\"token class-name\">size_t<\/span> num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u53ea\u6bd4\u8f83\u524d num \u4e2a\u5b57\u7b26\u3002<\/li>\n<\/ul>\n<hr \/>\n<h2>\u4e94\u3001\u9ad8\u7ea7\u5b57\u7b26\u4e32\u64cd\u4f5c<\/h2>\n<h3>1. strstr &#8211; \u67e5\u627e\u5b50\u4e32<\/h3>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">strstr<\/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><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u8fd4\u56de str2 \u5728 str1 \u4e2d\u9996\u6b21\u51fa\u73b0\u7684\u5730\u5740&#xff0c;\u672a\u627e\u5230\u8fd4\u56de NULL\u3002<\/li>\n<\/ul>\n<p>\u6a21\u62df\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">my_strstr<\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> cp <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>str1<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">*<\/span>str2<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> cp<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>cp<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s1 <span class=\"token operator\">&#061;<\/span> cp<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s2 <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>str2<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>s1 <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">*<\/span>s2 <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">*<\/span>s1 <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">*<\/span>s2<span class=\"token punctuation\">)<\/span><br \/>\n            s1<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> s2<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">*<\/span>s2<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> cp<span class=\"token punctuation\">;<\/span><br \/>\n        cp<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 constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>2. strtok &#8211; \u5b57\u7b26\u4e32\u5206\u5272<\/h3>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">strtok<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> sep<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u7528\u6cd5&#xff1a;\n<ul>\n<li>\u9996\u6b21\u8c03\u7528&#xff1a;strtok(str, sep)&#xff0c;\u540e\u7eed\u8c03\u7528&#xff1a;strtok(NULL, sep)\u3002<\/li>\n<li>\u4f1a\u4fee\u6539\u539f\u5b57\u7b26\u4e32&#xff08;\u5c06\u5206\u9694\u7b26\u66ff\u6362\u4e3a \\\\0&#xff09;\u3002<\/li>\n<li>\u9700\u5206\u5272\u4e34\u65f6\u62f7\u8d1d\u7684\u5b57\u7b26\u4e32&#xff08;\u539f\u5b57\u7b26\u4e32\u4e0d\u53ef\u4e3a\u5e38\u91cf&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;\u5206\u5272IP\u5730\u5740<\/p>\n<p><span class=\"token keyword\">char<\/span> ip<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;192.168.1.1&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> sep <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;.&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> token <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strtok<\/span><span class=\"token punctuation\">(<\/span>ip<span class=\"token punctuation\">,<\/span> sep<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>token<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> token<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    token <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strtok<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> sep<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;192 \u2192 168 \u2192 1 \u2192 1<\/span><\/p>\n<h3>3. strerror &amp; perror &#8211; \u9519\u8bef\u4fe1\u606f<\/h3>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> errnum<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8fd4\u56de\u9519\u8bef\u7801\u5bf9\u5e94\u7684\u5b57\u7b26\u4e32<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u76f4\u63a5\u6253\u5370\u9519\u8bef\u63cf\u8ff0&#xff08;\u683c\u5f0f&#xff1a;s: \u9519\u8bef\u4fe1\u606f&#xff09;<\/span><\/p>\n<ul>\n<li>\u793a\u4f8b&#xff1a;<\/li>\n<\/ul>\n<p>FILE<span class=\"token operator\">*<\/span> fp <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fopen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;nonexist.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;r&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>fp<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;File open failed&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;File open failed: No such file or directory<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h2>\u5173\u952e\u6ce8\u610f\u4e8b\u9879<\/h2>\n<li>\u5b57\u7b26\u51fd\u6570&#xff1a;\u4f9d\u8d56 &lt;ctype.h&gt;&#xff0c;\u53c2\u6570\u4e3a int \u7c7b\u578b&#xff08;\u53ef\u4f20 char&#xff09;\u3002<\/li>\n<li>\u5b57\u7b26\u4e32\u51fd\u6570&#xff1a;\n<ul>\n<li>\u64cd\u4f5c\u4ee5 \\\\0 \u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u786e\u4fdd\u76ee\u6807\u7a7a\u95f4\u8db3\u591f\u5927\u3001\u53ef\u4fee\u6539\u3002<\/li>\n<li>\u907f\u514d\u65e0\u957f\u5ea6\u68c0\u67e5\u7684\u51fd\u6570&#xff08;\u5982 strcpy\u3001strcat&#xff09;&#xff0c;\u4f18\u5148\u4f7f\u7528\u5b89\u5168\u7248\u672c&#xff08;strncpy\u3001strncat&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u9519\u8bef\u5904\u7406&#xff1a;\n<ul>\n<li>\u4f7f\u7528 strerror \u6216 perror \u7ed3\u5408 errno \u8bca\u65ad\u95ee\u9898\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u6027\u80fd&#xff1a;strlen \u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(n)&#xff0c;\u907f\u514d\u5728\u5faa\u73af\u4e2d\u91cd\u590d\u8c03\u7528\u3002<\/li>\n<p>\u5efa\u8bae\u7ed3\u5408\u4ee3\u7801\u5b9e\u8df5\u52a0\u6df1\u7406\u89e3&#xff01;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb361\u6b21\uff0c\u70b9\u8d5e3\u6b21\uff0c\u6536\u85cf6\u6b21\u3002C\u8bed\u8a00\u5b57\u7b26\u4e0e\u5b57\u7b26\u4e32\u51fd\u6570\u8be6\u89e3\uff0c\u5e26\u4f60\u4e86\u89e3\u5982\u4f55\u4f7f\u7528\u548c\u590d\u73b0\u65b9\u6cd5<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[174,371,190,305,427,124],"topic":[],"class_list":["post-53038","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-371","tag-190","tag-305","tag-427","tag-124"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - 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