{"id":31,"date":"2013-01-23T14:39:00","date_gmt":"2013-01-23T06:39:00","guid":{"rendered":"http:\/\/www.pufengdu.org\/srv\/blog\/?p=31"},"modified":"2014-12-02T17:46:21","modified_gmt":"2014-12-02T09:46:21","slug":"%e9%82%a3%e4%ba%9b%e4%bd%a0%e9%9c%80%e8%a6%81%e8%ae%b0%e5%be%97%e9%87%8a%e6%94%be%e5%86%85%e5%ad%98%e7%9a%84%e5%ba%93%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.pufengdu.org\/blog\/?p=31","title":{"rendered":"\u90a3\u4e9b\u4f60\u9700\u8981\u8bb0\u5f97\u91ca\u653e\u5185\u5b58\u7684\u5e93\u51fd\u6570"},"content":{"rendered":"

\u8fd1\u65e5\u4e00\u76f4\u7528C\u8bed\u8a00\u5199\u4ee3\u7801\uff0c\u4eca\u5929\u63a5\u8fd1\u5b8c\u5de5\uff0c\u7528mtrace\u627e\u4e86\u4e0b\u5185\u5b58\u6cc4\u6f0f\u3002\u53d1\u73b0\u4e86\u51e0\u4ef6\u503c\u5f97\u8bb0\u5f55\u7684\u4e8b\u60c5\uff1a<\/p>\n

1. fopen()\u4ea7\u751f\u7684FILE*\u5b9e\u9645\u6307\u5411\u7684\u662f\u4e00\u4e2aFILE\u7ed3\u6784\u4f53\uff0c\u8fd9\u4e2a\u7ed3\u6784\u4f53\u5728fopen\u91cc\u9762\u662f\u901a\u8fc7malloc\u751f\u6210\u51fa\u6765\u7684\uff0c\u6240\u4ee5\uff0c\u662f\u5e94\u8be5\u91ca\u653e\u6389\u7684\u3002\u91ca\u653e\u7684\u65b9\u6cd5\u4e0d\u662f\u8c03\u7528free\uff0c\u800c\u662f\u8c03\u7528fclose().\u5c31\u662f\u8bf4\u5982\u679c\u4f60\u5148\u5728\u67d0\u4e2a\u5730\u65b9\u5199\u4e86<\/p>\n

\r\nFILE *fp=fopen(\"XXXXXX\",\"r\");\r\n<\/pre>\n
\u90a3\u4e48\u4e00\u5b9a\u5f97\u5728\u67d0\u4e2a\u53e6\u5916\u7684\u5730\u65b9\u505a\u4e0b\u9762\u7684\u4e8b\u60c5<\/p>\n
\r\nfclose(fp);\r\nfp=NULL;\r\n<\/pre>\n
\u4e0d\u505a\u5c31\u4f1a\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n
2. GNU libc \u6709\u4e2a\u6269\u5c55\u5e93\u51fd\u6570\u53ebgetline()\u7684\uff0c\u7528\u6765\u4ece\u6587\u672c\u6587\u4ef6\u91cc\u9762\u9010\u884c\u8bfb\u53d6\u6587\u672c\u5f88\u65b9\u4fbf\u3002\u4f46\u662f\u8fd9\u4e2a\u51fd\u6570\u6bcf\u6b21\u542f\u52a8\u7684\u65f6\u5019\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a\u8bfb\u53d6\u7f13\u51b2\u533a\uff0c\u5373\u4fbf\u8bfb\u53d6\u5931\u8d25\uff0c\u8fd9\u4e2a\u7f13\u51b2\u533a\u4e5f\u4f1a\u751f\u6210\uff0c\u5e76\u4e14\u8fd9\u4e2a\u7f13\u51b2\u533a\u7684\u6307\u9488\u4f1a\u88ab\u53c2\u6570 char **lineptr\u6240\u6307\u5411\u7684\u6307\u9488\u8fd4\u56de\u3002\u6240\u4ee5\uff0c\u5982\u679c\u4f60\u662f\u7528\u8fd9\u4e2a\u73a9\u610f\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\uff0c\u5e76\u4e14\u662f\u7528\u8fd4\u56de\u503c\u662f\u5426>=0\u6765\u5224\u65ad\u6587\u4ef6\u662f\u5426\u8bfb\u53d6\u5b8c\u6210\uff0c\u90a3\u4e48\u4e00\u5b9a\u5f97\u8bb0\u5f97\u91ca\u653e\u6389\u6bcf\u6b21\u8bfb\u53d6\u7684\u8fd9\u4e2a\u7f13\u51b2\u533a\uff0c\u7279\u522b\u662f\u8bfb\u5230\u6587\u4ef6\u7ed3\u675f\uff0c\u8fd4\u56de\u8bfb\u53d6\u957f\u5ea6\u4e3a-1\u7684\u65f6\u5019\uff0c\u90a3\u4e2a\u7f13\u51b2\u533a\u6307\u9488\u4e5f\u5f97free\u6389\u3002\u5177\u4f53\u6765\u8bf4\u5c31\u662f\u8fd9\u4e48\u4e2a\u6837\u5b50\uff0c\u7279\u522b\u6ce8\u610f\u5176\u4e2d\u91cd\u8981\u7684\u90a3\u51e0\u884c\u3002<\/p>\n
\r\nwhile(......)\r\n{\r\n    char *tmpLine = NULL;\r\n    size_t tmpLength = 0;\r\n    size_t tmpXL = getline(&tmpLine,&tmpLength,fp);\r\n    \/*Important code!*\/\r\n    if ((int)tmpXL == -1)\r\n    {\r\n        free(tmpLine);\r\n        tmpLine = NULL;\r\n        break;\r\n    }\r\n    \/*Important code complete.*\/\r\n}\r\n<\/pre>\n
3. strdup()\uff0c\u8fd9\u4e2a\u51fd\u6570\u590d\u5236\u51fa\u6765\u7684\u5b57\u7b26\u4e32\uff0c\u5f53\u7136\u5f97\u81ea\u5df1\u624b\u52a8\u91ca\u653e\u6389\uff0c\u5426\u5219\u5c31\u4f1a\u5185\u5b58\u6cc4\u6f0f\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8fd1\u65e5\u4e00\u76f4\u7528C\u8bed\u8a00\u5199\u4ee3\u7801\uff0c\u4eca\u5929\u63a5\u8fd1\u5b8c\u5de5\uff0c\u7528mtrace\u627e\u4e86\u4e0b\u5185\u5b58\u6cc4\u6f0f\u3002\u53d1\u73b0\u4e86\u51e0\u4ef6\u503c … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/31"}],"collection":[{"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=31"}],"version-history":[{"count":2,"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/31\/revisions"}],"predecessor-version":[{"id":188,"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/31\/revisions\/188"}],"wp:attachment":[{"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pufengdu.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}