{"id":850,"date":"2010-07-25T20:50:46","date_gmt":"2010-07-26T02:50:46","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=850"},"modified":"2010-07-31T21:37:40","modified_gmt":"2010-08-01T03:37:40","slug":"%e5%ae%9e%e7%8e%b0cp%e5%91%bd%e4%bb%a4","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/850","title":{"rendered":"\u5b9e\u73b0cp\u547d\u4ee4\u2013\u4ece\u4e3b\u51fd\u6570\u5f00\u59cb"},"content":{"rendered":"

\u4eca\u5929\u9648\u8001\u5e08\u5bf9\u6211\u4eec\u4ee5\u540eLinux\u7684\u5b66\u4e60\u505a\u4e86\u4e9b\u6307\u5bfc\uff0c\u4e00\u9488\u89c1\u8840\u7684\u6307\u51fa\u6211\u4eec\u5b66\u4e60\u4e2d\u7ecf\u5e38\u4f1a\u9047\u5230\u7684\u95ee\u9898\u3002\u6211\u5927\u6982\u8bb0\u4e86\u4e00\u4e0b\uff1a<\/p>\n

1.\u4ece\u6709\u9700\u6c42\u505a\u8d77\uff0c\u4e0d\u8981\u76f2\u76ee\u770b\u4e66\u3002<\/p>\n

2.\u6709\u8ba1\u5212\uff0c\u6709\u6b65\u9aa4\u7684\u5b66\u4e60\u3002<\/p>\n

3.\u4e3b\u52a8\u5b66\u4e60\uff0c\u5b66\u4f1a\u5206\u4eab\u3002<\/p>\n

\u6682\u4e0d\u8bf4\u5176\u4ed6\uff0c\u6211\u89c9\u5f97\u7b2c1\u6761\u5728\u6211\u4eec\u5b66\u4e60\u8fc7\u7a0b\u4e2d\u5f88\u503c\u5f97\u6ce8\u610f\u3002\u524d\u6bb5\u65f6\u95f4\u505a\u4e86my_ls.c\u548cmy_shell.c\u3002\u867d\u7136\u90fd\u8c03\u8bd5\u6210\u529f\uff0c\u4f46\u8fd8\u662f\u6781\u5927\u7684\u53c2\u8003\u4e86\u300alinuxC\u7f16\u7a0b\u5b9e\u6218\u300b\u8fd9\u672c\u4e66\u3002\u56e0\u4e3a\u6587\u4ef6\u7cfb\u7edf\u5728linux\u4e2d\u5360\u636e\u7740\u91cd\u8981\u5730\u4f4d\uff0c\u6240\u4ee5\u8fd8\u662f\u5f97\u591a\u901a\u8fc7\u5b9e\u8df5\u6765\u7406\u89e3\u8fd9\u90e8\u5206\u7684\u5185\u5bb9\uff0c\u4e0d\u59a8\u5927\u5bb6\u548c\u6211\u4e00\u8d77\u505amy_cp\uff0c\u7ec3\u4e60\u4e00\u4e0b\u6587\u4ef6\u64cd\u4f5c\u8fd9\u90e8\u5206\u7684\u7cfb\u7edf\u8c03\u7528\u51fd\u6570\u3002<\/p>\n

\u65e2\u7136\u6211\u4eec\u8981\u5b9e\u73b0cp\u547d\u4ee4\uff0c\u5fc5\u987b\u5f97\u4e86\u89e3cp\u547d\u4ee4\u7684\u57fa\u672c\u4f7f\u7528\u65b9\u6cd5\u3002\u8fd9\u65b9\u9762\u7684\u8d44\u6599\u7f51\u4e0a\u5f88\u591a\uff0c\u5e76\u4e14\u53ef\u4ee5\u53c2\u8003man\u624b\u518c\u81ea\u5df1\u8bd5\u8bd5\uff0c\u5728\u6b64\u6211\u4e0d\u518d\u8be6\u7ec6\u8bf4\u660e\u3002my_cp\u5c06\u8981\u5b9e\u73b0\u4ee5\u4e0b\u57fa\u672c\u7684\u529f\u80fd\uff1a<\/p>\n

1.\u5c06\u4e00\u4e2a\u6587\u4ef6\u62f7\u8d1d\u5230\u6307\u5b9a\u8def\u5f84\u3002\uff08\u76ee\u7684\u6587\u4ef6\u53ef\u5b58\u5728\u4e5f\u53ef\u4e0d\u5b58\u5728\uff09\u3002\u8fd9\u662fmy_cp\u4e2d\u6700\u57fa\u672c\u7684\u529f\u80fd\uff0c\u4e8b\u5b9e\u4e0a2\uff0c3\uff0c4\u529f\u80fd\u6700\u7ec8\u90fd\u4f1a\u88ab\u5206\u89e3\u6210\u6b64\u529f\u80fd\u3002<\/p>\n

2.\u5c06\u4e00\u4e2a\u76ee\u5f55\u62f7\u8d1d\u5230\u6307\u5b9a\u76ee\u5f55\u4e0b\uff0c\u6b64\u65f6\u5fc5\u987b\u52a0-R\u6216-r\u9009\u9879\u3002<\/p>\n

3.\u5c06\u591a\u4e2a\u76ee\u5f55\u62f7\u8d1d\u5230\u6307\u5b9a\u76ee\u5f55\u4e0b\uff0c\u6b64\u65f6\u5fc5\u987b\u52a0-R\u6216-r\u9009\u9879\u3002<\/p>\n

4.\u5c06\u591a\u4e2a\u6587\u4ef6\u62f7\u8d1d\u5230\u6307\u5b9a\u76ee\u5f55\u4e0b\u3002\u8fd9\u91cc\u7684\u6e90\u6587\u4ef6\u5373\u5305\u542b\u76ee\u5f55\u6587\u4ef6\u4e5f\u5305\u542b\u666e\u901a\u6587\u4ef6\u3002<\/p>\n

\u4e2a\u4eba\u5efa\u8bae\uff0c\u6700\u597d\u591a\u5728\u7ec8\u7aef\u8bd5\u8bd5\u4ee5\u4e0a\u5404\u79cd\u60c5\u51b5\uff0c\u91cd\u70b9\u770b\u4e00\u770bcp\u547d\u4ee4\u662f\u5982\u4f55\u5904\u7406\u975e\u6cd5\u547d\u4ee4\u7684\uff0c\u8fd9\u5bf9\u6211\u4eec\u4e0b\u9762\u7684\u7f16\u7a0b\u6709\u5e2e\u52a9\u3002<\/p>\n

\u8bf7\u6ce8\u610f\uff0c\u539f\u6587\u4ef6\u4e2d\u5982\u679c\u5b58\u5728\u76ee\u5f55\u6587\u4ef6\uff0c\u5e76\u4e14\u8f93\u5165\u7684\u547d\u4ee4\u884c\u53c2\u6570\u672a\u52a0-r\u6216-R\u9009\u9879\uff0c\u5219\u4f1a\u81ea\u52a8\u5ffd\u7565\u6b64\u6e90\u76ee\u5f55\u6587\u4ef6\uff0c\u800c\u5176\u4ed6\u6587\u4ef6\u7684\u62f7\u8d1d\u4e0d\u53d7\u5f71\u54cd\u3002\u5982\uff1a<\/p>\n

gues@huangwei-desktop:~\/code\/shell_command$ ls\r\nls  ls1  my_cp  my_cp1  my_cp.c  my_ls.c  my_shell.c  newls.c  t.c  tdir  test  tfile.c  ttfile.c\r\ngues@huangwei-desktop:~\/code\/shell_command$ cp my_shell.c tdir\/ test\/\r\ncp: \u7565\u8fc7\u76ee\u5f55\"tdir\/\"\r\ngues@huangwei-desktop:~\/code\/shell_command$ ls test\/\r\nmy_shell.c<\/pre>\n
\u5982\u679c\u4f60\u5b8c\u6210\u4e86my_ls\u6216\u8005my_shell\uff0c\u4f60\u4e00\u5b9a\u4f1a\u77e5\u9053\uff0c\u8fd9\u7c7b\u5b9e\u73b0\u7cfb\u7edf\u547d\u4ee4\u7684\u7a0b\u5e8f\u5728main\u51fd\u6570\u4e2d\u9996\u5148\u4f1a\u5bf9\u547d\u4ee4\u884c\u53c2\u6570\u8fdb\u884c\u89e3\u6790\uff0c\u5224\u65ad\u5176\u5408\u6cd5\u6027\uff0c\u7136\u540e\u518d\u6839\u636e\u7528\u6237\u7684\u8f93\u5165\uff08\u662f\u5426\u5305\u542b\u67d0\u9009\u9879\u6216\u8005\u53c2\u6570\u4e2a\u6570\u7b49\uff09\u6765\u201c\u5f15\u5bfc\u201d\u7a0b\u5e8f\u8fdb\u5165\u5176\u4ed6\u5b50\u51fd\u6570\uff0c\u4ee5\u4fbf\u5b8c\u6210\u76f8\u5e94\u529f\u80fd\u3002\u60f3\u60f3my_ls\u7a0b\u5e8f\uff0c\u96be\u9053\u4e0d\u662f\u8fd9\u6837\u5417\uff1f<\/p>\n
\u597d\u4e86\uff0c\u6211\u4eec\u5f00\u59cb\u5427\uff01<\/p>\n
\u9996\u5148\u8fdb\u5165\u4e3b\u51fd\u6570\u3002\u7531\u4e8e\u672c\u7a0b\u5e8f\u53ea\u652f\u6301-r\u6216\u8005-R\u9009\u9879\uff0c\u56e0\u6b64\u5982\u679c\u7528\u6237\u8f93\u5165\u9009\u9879\uff0c\u6211\u4eec\u6765\u5224\u65ad\u662f\u5426\u5408\u6cd5\u3002\u5982\u679c\u5408\u6cd5\u8ba9\u5176\u6807\u5fd7param_r\u4e3a\u771f\u3002\u7531\u4e8e-r\u6216-R\u9009\u9879\u4f4d\u7f6e\u4e0d\u4e00\u5b9a\u9650\u5236\u5728cp\u547d\u4ee4\u4e4b\u540e\uff08\u4e8b\u5b9e\u4e0a\u653e\u5728\u547d\u4ee4\u884c\u53c2\u6570\u672b\u5c3e\u4e5f\u53ef\u4ee5\uff09\uff0c\u6240\u4ee5\u7528index_r\u6765\u4fdd\u5b58\u5176\u4e0b\u6807\u3002\u5b9e\u73b0\u4ee3\u7801\u5982\u4e0b\uff1a\uff08\u56e0\u4e3a\u63d2\u4ef6\u539f\u56e0\uff0c\u4e0b\u9762\u7684\u4ee3\u7801\u5728\u51fa\u73b0<\u6216>\u7b26\u53f7\u7684\u540e\u9762\u5747\u52a0\u5165\u4e86 \\ <\/strong>\uff09<\/p>\n
\tchar dest_path[PATH_MAX+1];\r\n\tchar src_path[256][PATH_MAX+1];\r\n\tint i,k,num,src_num,index_r;\r\n\tstruct stat buf;\r\n\r\n\t\/\/check the legality of the options,only -r or -R\r\n\tfor(i=1;i<\\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_r=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
\u63a5\u4e0b\u6765\u8ba1\u7b97\u547d\u4ee4\u884c\u53c2\u6570\u4e2d\u53c2\u6570\u7684\u4e2a\u6570num\u4ee5\u53ca\u6e90\u6587\u4ef6\u7684\u4e2a\u6570src_num\uff0c\u8fd9\u4e24\u4e2a\u53d8\u91cf\u5907\u7528\u3002\u5982\u679cnum\u5c0f\u4e8e2\uff0c\u80af\u5b9a\u4e0d\u5408\u6cd5\u3002\u4e0a\u8ff0\u8981\u6c42\u90fd\u5408\u6cd5\u540e\uff0c\u63d0\u53d6\u76ee\u6807\u6587\u4ef6\u7684\u8def\u5f84\uff0c\u4e0a\u9762\u5df2\u7ecf\u8bf4\u8fc7\u56e0\u4e3aR\u548cr\u9009\u9879\u540e\u53ef\u4ee5\u51fa\u73b0\u5728\u53c2\u6570\u672b\u5c3e\uff0c\u56e0\u6b64\u5f97\u591a\u52a0\u4e00\u6b21\u5224\u65ad\uff0c\u5e76\u4e0d\u80fd\u76f4\u63a5\u8ba4\u4e3aargv[argc-1]\u5c31\u662f\u76ee\u6807\u6587\u4ef6\u8def\u5f84\u3002<\/p>\n
if(param_r)\r\n\t{\r\n\t\tnum=argc-1-1;\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<\\2)\r\n\t{\r\n\t\tprintf(\"my_cp: [option] (source) (dest)\\n\");\r\n\t\texit(1);\r\n\t}\r\n\t\/\/extract the dest path\r\n\tif(index_r!=argc-1)\r\n\t{\r\n\t\tstrcpy(dest_path,argv[argc-1]);\r\n\t}\r\n\telse\r\n\t{\r\n\t\tstrcpy(dest_path,argv[argc-2]);\r\n\t}<\/pre>\n
\u63a5\u4e0b\u6765\u63d0\u53d6\u6e90\u6587\u4ef6\u7684\u8def\u5f84\uff0c\u7531\u4e8e\u6e90\u6587\u4ef6\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u56e0\u6b64\u6211\u4eec\u7528\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\u6765\u5b58\u50a8\u6e90\u6587\u4ef6\u8def\u5f84\u3002<\/p>\n
\t\/\/extract the src path\r\n\tk=0;\r\n\tfor(i=1;i<\\argc-1;i++)\r\n\t{\r\n\t\tif(i==index_r&&param_r)\r\n\t\t\tcontinue;\r\n\t\telse\r\n\t\t{\r\n\t\t\tstrcpy(src_path[k++],argv[i]);\r\n\t\t}\r\n\t}<\/pre>\n
\u4ee5\u4e0a\u5de5\u4f5c\u90fd\u505a\u597d\u540e\uff0c\u6211\u4eec\u53ef\u4ee5”\u5206\u6d41\u201c\u4e86\uff0c\u5373\u6839\u636e\u4e0d\u540c\u8981\u6c42\u8fdb\u5165\u4e0d\u540c\u7684\u5b50\u51fd\u6570\u3002\u6211\u7684\u201c\u5206\u6d41\u201d\u539f\u5219\u662f\u6839\u636e\u6e90\u6587\u4ef6\u6570src_num\u3002\u5f53\u5176\u5927\u4e8e1\u65f6\uff0c\u8bf4\u660e\u6e90\u6587\u4ef6\u662f\u591a\u4e2a\u3002\u9996\u5148\u5224\u65ad\u6b64\u76ee\u7684\u6587\u4ef6\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u5b58\u5728\u90a3\u4e48\u63a5\u7740\u5224\u65ad\u5b83\u662f\u5426\u4e3a\u4e00\u4e2a\u76ee\u5f55\u6587\u4ef6\uff0c\u56e0\u4e3a\u591a\u4e2a\u6e90\u6587\u4ef6\u4e0d\u53ef\u80fd\u62f7\u8d1d\u5230\u4e00\u4e2a\u975e\u76ee\u5f55\u6587\u4ef6\u5f53\u4e2d\u3002
\n\u786e\u5b9a\u4e86\u76ee\u7684\u6587\u4ef6\u662f\u4e00\u4e2a\u76ee\u5f55\u540e\uff0c\u6211\u4eec\u8981\u5c06\u8fd9\u4e2a\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u6587\u4ef6\u4f9d\u6b21\u8c03\u7528\u5b50\u51fd\u6570\u8fdb\u884c\u201c\u5206\u6d41\u201d\u3002
\n\u8fd9\u91cc\u6709\u4e24\u4e2a\u91cd\u8981\u7684\u5b50\u51fd\u6570\uff0ccp_single\u51fd\u6570\u9488\u5bf9\u8fd9\u6837\u7684\u60c5\u51b5\uff1a\u5c06\u5355\u4e2a\u6587\u4ef6\u62f7\u8d1d\u5230\u53e6\u4e00\u6587\u4ef6\u3002\uff08\u529f\u80fd1\uff09\u3002cp_directory\u51fd\u6570\u9488\u5bf9\u8fd9\u6837\u7684\u60c5\u51b5\uff1a\u5c06\u5355\u4e2a\u6587\u4ef6\u5939\u62f7\u8d1d\u5230\u6307\u5b9a\u76ee\u5f55\uff08\u529f\u80fd2\uff09\u3002\u8fdb\u5165\u8fd9\u4e24\u4e2a\u5b50\u51fd\u6570\u7684\u4f9d\u636e\u5c31\u662f\uff0c\u5982\u679c\u6e90\u6587\u4ef6\u662f\u4e00\u4e2a\u6587\u4ef6\u8fdb\u5165\u524d\u8005\uff0c\u6e90\u6587\u4ef6\u662f\u76ee\u5f55\u8fdb\u5165\u540e\u8005\u3002\u800c\u6211\u4eec\u7528for\u5faa\u73af\u5c06\u4e0a\u8ff0\u4e24\u51fd\u6570\u6709\u6548\u7684\u7ed3\u5408\u8d77\u6765\uff0c\u5c31\u53ef\u4ee5\u5b9e\u73b0\u4e0a\u8ff0\u529f\u80fd\u76843\uff0c4\u3002<\/p>\n
\tif(src_num>\\1)\r\n\t{\r\n\t\tif(stat(dest_path,&buf)==-1)\r\n\t\t{\r\n\t\t\tprintf(\"my_cp: \\\"%s\\\" is not a directory.\\n\",dest_path);\r\n\t\t\texit(1);\r\n\t\t}\r\n\t\t\/\/the dest path is valid\r\n\t\tif(S_ISDIR(buf.st_mode))\r\n\t\t{\r\n\t\t\tstrcpy(temp_dest_path,dest_path);\r\n\t\t\t\/\/the dest path is directory\r\n\t\t\tfor(i=0;i<\\src_num;i++)\r\n\t\t\t{\r\n\t\t\t\tif(stat(src_path[i],&buf)==-1)\r\n\t\t\t\t{\r\n\t\t\t\t\tprintf(\"my_cp: can't get file status of \\\"%s\\\" : no this file or directory.\\n\",src_path[i]);\r\n\t\t\t\t\tcontinue;\r\n\t\t\t\t}\r\n\t\t\t\t\/\/the src_path exist\r\n\t\t\t\tif(!S_ISDIR(buf.st_mode))\r\n\t\t\t\t{\r\n\t\t\t\t\tcp_single(src_path[i],dest_path);\r\n\t\t\t\t}\r\n\t\t\t\telse if(param_r)\r\n\t\t\t\t{\r\n\t\t\t\t\tcp_directory(src_path[i],dest_path);\r\n\r\n\t\t\t\t}\r\n\t\t\t\telse\r\n\t\t\t\t{\r\n\t\t\t\t\tprintf(\"my_cp: skip the directory: \\\"%s\\\".\\n\",src_path[i]);\r\n\t\t\t\t}\r\n\t\t\t\tstrcpy(dest_path,temp_dest_path);\r\n\r\n\t\t\t}\r\n\r\n\t\t}\r\n\t\telse\r\n\t\t{\r\n\t\t\tprintf(\"my_cp: \\\"%s\\\" is not a directory.\\n\",dest_path);\r\n\t\t\texit(1);\r\n\t\t}\r\n\t}\r\n\telse\r\n\t{\r\n\t\t\/\/The code here be omited\r\n\t}<\/pre>\n
\u6211\u4eec\u63a5\u4e0b\u6765\u4e3b\u8981\u6765\u770b\u6e90\u6587\u4ef6\u6570\u76ee\u4e3a1\u7684\u60c5\u51b5\u3002\u5176\u5b9e\u8fd9\u5c5e\u4e8ecp\u547d\u4ee4\u6700\u57fa\u672c\u7684\u529f\u80fd\uff0ccp_directory\u51fd\u6570\u4e5f\u4f1a\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u3002
\n\u6e90\u6587\u4ef6\u5b58\u5728\u7684\u65f6\u5019\uff0c\u5982\u679c\u6e90\u6587\u4ef6\u662f\u4e00\u4e2a\u76ee\u5f55\u5e76\u4e14\u6709r\u6216R\u9009\u9879\uff0c\u90a3\u4e48\u8fdb\u5165cp_directory\u51fd\u6570\uff08\u81f3\u4e8e\u76ee\u6807\u6587\u4ef6\u662f\u5426\u4e3a\u76ee\u5f55\uff0c\u8fdb\u5165\u6b64\u51fd\u6570\u53ef\u4ee5\u5224\u65ad\uff09\u3002\u5982\u679c\u6e90\u6587\u4ef6\u4e0d\u662f\u76ee\u5f55\u6587\u4ef6\uff0c\u90a3\u4e48\u8fdb\u5165cp_single\u51fd\u6570\u5373\u53ef\u3002<\/p>\n
\tif(src_num>\\1)\r\n\t{\r\n\t\t\/\/The code here be omited\r\n\t}\r\n\telse\r\n\t{\r\n\t\t\/\/only one src path\r\n\t\tif(stat(src_path[0],&buf)==-1)\r\n\t\t{\r\n\t\t\tprintf(\"my_cp: can't get file status of \\\"%s\\\" : no this file or directory.\\n\",src_path[0]);\r\n\t\t\texit(1);\r\n\t\t}\r\n\t\tif(S_ISDIR(buf.st_mode))\r\n\t\t{\r\n\t\t\tif(param_r)\r\n\t\t\t{\r\n\t\t\t\tcp_directory(src_path[0],dest_path);\r\n\t\t\t\texit(0);\r\n\t\t\t}\r\n\t\t\telse\r\n\t\t\t{\r\n\t\t\t\tprintf(\"my_cp: skip the directory: \\\"%s\\\".\\n\",src_path[0]);\r\n\t\t\t\texit(1);\r\n\t\t\t}\r\n\t\t}\r\n\t\telse\r\n                {\r\n\t\t\tcp_single(src_path[0],dest_path);\r\n\t\t}\r\n\t}<\/pre>\n
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