{"id":946,"date":"2010-07-28T21:49:44","date_gmt":"2010-07-29T03:49:44","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=946"},"modified":"2010-08-08T06:43:55","modified_gmt":"2010-08-08T12:43:55","slug":"%e5%ae%9e%e7%8e%b0cp%e5%91%bd%e4%bb%a4-%e4%bc%98%e5%8c%96%e5%af%b9%e9%80%89%e9%a1%b9%e7%9a%84%e5%88%a4%e6%96%ad","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/946","title":{"rendered":"\u5b9e\u73b0cp\u547d\u4ee4(4)"},"content":{"rendered":"<p>\u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u5b9e\u73b0\u4e86my_cp\u3002\u90a3\u4e48\u6211\u4eec\u6765\u8fd0\u884c\u4e00\u4e0b\u4e0b\u9762\u7684\u547d\u4ee4\u5427\uff1a<\/p>\n<pre class=\"brush:c\">gues@huangwei-desktop:~\/code\/shell_command$ .\/my_cp -r dir\/ newdir\/ -r\r\nmy_cp: can't get file status of \"-r\" : no this file or directory.<\/pre>\n<p>\u95ee\u9898\u51fa\u6765\u4e86\uff0c\u6211\u4eec\u5e76\u6ca1\u6709\u8003\u8651\u5230\u591a\u4e2a\u91cd\u590d\u9009\u9879\u7684\u60c5\u51b5\uff0c\u56e0\u6b64\u4e0a\u9762\u547d\u4ee4\u628a\u672b\u5c3e\u7684-r\u5f53\u6210\u4e86\u6587\u4ef6\u540d\u3002\u5982\u679c\u7528cp\u6267\u884c\u4e0a\u9762\u7684\u6307\u4ee4\uff0c\u90a3\u4e48\u662f\u6210\u529f\u7684\uff0c\u56e0\u4e3a\u591a\u4e2a\u91cd\u590d\u9009\u9879\u5728cp\u547d\u4ee4\u4e0b\u5c31\u76f8\u5f53\u4e8e\u4e00\u4e2a\u3002\u56e0\u6b64\u6211\u4eec\u4e0b\u9762\u6765\u4fee\u6539\u4ee3\u7801\u3002<br \/>\n\u4f60\u53ef\u4ee5\u8ba9\u68c0\u67e5\u9009\u9879\u5904\u7684param_r=1;\u6539\u4e3aparam+=1;\u7136\u540e\u518d\u52a0\u5165\u4e0b\u9762\u7684\u4ee3\u7801\uff0c\u5f53\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\u7684\u65f6\u5019\uff0c\u8ba9\u5176\u51fa\u9519\u3002<\/p>\n<pre class=\"brush:c\">if(param_r&gt;1)\r\n{\r\nprintf(\"my_cp:invalid options.\\n\");\r\nexit(1);\r\n}<\/pre>\n<p>\u4e3a\u4e86\u5b8c\u7f8e\u4e00\u4e9b\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u505a\u3002\u9996\u5148\u6211\u4eec\u5c06\u539f\u6765index_r\u6539\u6210\u6570\u7ec4index\uff0c\u8bb0\u5f55\u51fa\u73b0-r\u7684\u4f4d\u7f6e\u3002\u6211\u4eec\u53ef\u4ee5\u8ba9\u8fd9\u4e2a\u6570\u7ec4\u5168\u90e8\u521d\u59cb\u5316\u4e3a0\uff0c\u5982\u679c\u53c2\u6570\u4e2d\uff0c\u7b2ci\u4e2a\u53c2\u6570\u4e3a-r\u6216\u8005-R\uff0c\u90a3\u4e48\u5c31\u5c06index[i]\u8d4b\u503c\u4e3ai\u3002\u5e76\u4e14\u8fd9\u65f6\u5019\u7684param_r\u5c31\u8981\u7d2f\u8ba1\u51fa\u73b0\u5408\u6cd5\uff08\u5bf9\u4e8e\u672c\u7a0b\u5e8f\uff0c\u5408\u6cd5\u9009\u9879\u5c31\u662f-r\u6216-R\u4e86\uff09\u9009\u9879\u7684\u4e2a\u6570\u3002<\/p>\n<pre class=\"brush:c\">\t\/\/check the legality of the options,only -r or -R\r\n\tfor(i=1;i&lt;\\argc;i++)\r\n\t{\r\n\t\tif(argv[i][0]=='-')\r\n\t\t{\r\n\t\t\tif((!strcmp(argv[i],\"-r\")||!strcmp(argv[i],\"-R\")))\r\n\t\t\t{\r\n\t\t\t\tparam_r+=1;\r\n\t\t\t\tindex[i]=i;\r\n\t\t\t}\r\n\t\t\telse\r\n\t\t\t{\r\n\t\t\t\tprintf(\"my_cp:invalid options: %s\\n\",argv[i]);\r\n\t\t\t\texit(1);\r\n\t\t\t}\r\n\t\t}\r\n\t}<\/pre>\n<p>\u90a3\u4e48\u5728\u8ba1\u7b97\u6e90\u6587\u4ef6\u6570\u76ee\u7684\u65f6\u5019\u4e5f\u76f8\u5e94\u7684\u5c31\u6709\u4e86\u5c0f\u6539\u52a8\u3002<\/p>\n<pre class=\"brush:c\">\tif(param_r)\r\n\t{\r\n\t\tnum=argc-1-param_r;\r\n\t\tsrc_num=num-1;\r\n\t}\r\n\telse\r\n\t{\r\n\t\tnum=argc-1;\r\n\t\tsrc_num=num-1;\r\n\t}\r\n\tif(num&lt;\\2)\r\n\t{\r\n\t\tprintf(\"my_cp: [option]  \\n\");\r\n\t\texit(1);\r\n\t}<\/pre>\n<p>\u63d0\u53d6\u76ee\u6807\u6587\u4ef6\u7684\u65f6\u5019\uff0c\u5c31\u6709\u4e9b\u5c0f\u9ebb\u70e6\uff0c\u4f46\u662f\u4e5f\u662f\u53ef\u4ee5\u89e3\u51b3\u7684\u3002\u6211\u4eec\u4ece\u547d\u4ee4\u884c\u53c2\u6570\u672b\u5c3e\u5f00\u59cb\uff0c\u627e\u5230\u90a3\u4e2a\u4e0d\u662f\u9009\u9879\u7684\u90a3\u4e2a\u53c2\u6570\uff0c\u56e0\u4e3a\u76ee\u6807\u6587\u4ef6\u603b\u662f\u9760\u8fd1\u672b\u5c3e\u7684\u3002\u6bd4\u5982\uff1a.\/my_cp dir\/ newdir\/ -r -r<\/p>\n<pre class=\"brush:c\">\t\/\/extract the dest path\r\n\tfor(i=argc-1;i&gt;\\0;i--)\r\n\t{\r\n\t\tif(!strcmp(argv[i],\"-r\")||!strcmp(argv[i],\"-R\"))\r\n\t\t\tcontinue;\r\n\t\telse\r\n\t\t\tbreak;\r\n\t}\r\n\tif(i==argc-1)\r\n\t{\r\n\t\tstrcpy(dest_path,argv[i]);\r\n\t}\r\n\telse\r\n\t{\r\n\t\tstrcpy(dest_path,argv[i]);\r\n\t}<\/pre>\n<p>\u597d\u4e86\uff0c\u6539\u5b8c\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u4e0b\u9762\u5c31\u548c\u4ee5\u524d\u7684\u4e00\u6837\u4e86\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u907f\u514d\u5f00\u59cb\u7684\u65f6\u5019\u6211\u4eec\u6240\u4e3e\u7684\u4f8b\u5b50\u7684\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u5b9e\u73b0\u4e86my_cp\u3002\u90a3\u4e48\u6211\u4eec\u6765\u8fd0\u884c\u4e00\u4e0b\u4e0b\u9762\u7684\u547d\u4ee4\u5427\uff1a gues@huangwei-desktop:~ [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[109,125,107],"class_list":["post-946","post","type-post","status-publish","format-standard","hentry","category-linuxc","tag-c","tag-linux","tag-107"],"views":5596,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/946","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=946"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/946\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=946"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=946"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=946"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}