{"id":104919,"date":"2026-09-13T12:41:12","date_gmt":"2026-09-13T04:41:12","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/104919.html"},"modified":"2026-09-13T12:41:12","modified_gmt":"2026-09-13T04:41:12","slug":"%e6%9c%89%e7%ac%a6%e5%8f%b7%e6%97%a0%e7%ac%a6%e5%8f%b7%e6%af%94%e5%a4%a7%e5%b0%8f%e5%bc%82%e5%b8%b8%ef%bc%9a%e6%b7%b7%e6%af%94%e8%a7%a6%e5%8f%91%e9%9a%90%e5%bc%8f%e8%bd%ac%e6%97%a0%e7%ac%a6%e5%8f%b7","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/104919.html","title":{"rendered":"\u6709\u7b26\u53f7\u65e0\u7b26\u53f7\u6bd4\u5927\u5c0f\u5f02\u5e38\uff1a\u6df7\u6bd4\u89e6\u53d1\u9690\u5f0f\u8f6c\u65e0\u7b26\u53f7\uff0c\u7edf\u4e00\u7c7b\u578b\u518d\u6bd4\u8f83"},"content":{"rendered":"

\u6709\u7b26\u53f7\u65e0\u7b26\u53f7\u6bd4\u5927\u5c0f\u5f02\u5e38：\u6df7\u6bd4\u89e6\u53d1\u9690\u5f0f\u8f6c\u65e0\u7b26\u53f7，\u7edf\u4e00\u7c7b\u578b\u518d\u6bd4\u8f83<\/h2>\n

\u6458\u8981：C \u8bed\u8a00\u4e2d，\u6709\u7b26\u53f7\u6570\u4e0e\u65e0\u7b26\u53f7\u6570\u6df7\u5408\u6bd4\u8f83\u65f6，\u6709\u7b26\u53f7\u6570\u4f1a\u88ab\u9690\u5f0f\u8f6c\u6362\u4e3a\u65e0\u7b26\u53f7\u6570，\u5bfc\u81f4\u8d1f\u6570（\u5982 -1）\u53d8\u6210\u8d85\u5927\u6b63\u6570（0xFFFFFFFF），\u6bd4\u8f83\u7ed3\u679c\u5b8c\u5168\u53cd\u76f4\u89c9，\u8d1f\u6570\u88ab\u5f53\u4f5c\u5927\u6b63\u6570\u653e\u884c，\u5f15\u53d1\u8d8a\u754c\u8bbf\u95ee\u7b49\u9690\u60a3\u3002\u672c\u6587\u901a\u8fc7\u771f\u5b9e\u7ffb\u8f66\u73b0\u573a\u3001C \u7684\u5bfb\u5e38\u7b97\u672f\u8f6c\u6362\u539f\u7406\u3001\u9519\u8bef\u4ee3\u7801\u5256\u6790，\u7ed9\u51fa\u300c\u5148\u5224\u8d1f + \u7edf\u4e00\u7c7b\u578b\u518d\u6bd4\u8f83\u300d\u7684\u6b63\u786e\u89e3\u6cd5，\u5e76\u914d\u5957 -Wsign-compare \u7f16\u8bd1\u8b66\u544a\u4e0e\u6700\u4f73\u5b9e\u8df5\u6e05\u5355，\u5e2e\u4f60\u5f7b\u5e95\u907f\u5f00\u6df7\u6bd4\u9677\u9631\u3002<\/p>\n

\u4e00\u3001\u5f00\u7bc7：\u4e00\u4e2a\u771f\u5b9e\u7ffb\u8f66\u73b0\u573a<\/h3>\n

\u4e00\u6bb5\u4ee3\u7801\u6bd4\u8f83\u4e24\u4e2a\u957f\u5ea6：int len = read_len(); \u548c uint32_t max = 256;，\u5224\u65ad if (len < max) \u672c\u610f"\u957f\u5ea6\u4e3a\u8d1f\u6216\u8d85 max \u90fd\u62d2\u7edd"\u3002\u4f46\u53d1\u73b0：\u5f53 len \u4e3a\u8d1f\u6570（\u5982 -1 \u8868\u793a\u8bfb\u9519）\u65f6，if (len < max) \u5c45\u7136\u4e3a false，\u8d1f\u6570\u88ab\u653e\u8fdb\u4e86\u540e\u7eed\u5904\u7406 \u2192 \u8d8a\u754c\u8bbf\u95ee\u3002<\/p>\n

\u539f\u56e0：C \u8bed\u8a00\u91cc\u6709\u7b26\u53f7\u4e0e\u65e0\u7b26\u53f7\u6bd4\u8f83，\u6709\u7b26\u53f7\u6570\u4f1a\u88ab\u9690\u5f0f\u8f6c\u6362\u6210\u65e0\u7b26\u53f7\u3002-1 \u53d8\u6210 0xFFFFFFFF（\u8d85\u5927\u6b63\u6570），\u8fdc\u5927\u4e8e max=256 \u2192 len < max \u4e3a false \u2192 \u6f0f\u68c0\u8d1f\u6570\u3002<\/p>\n

\u6839\u56e0\u4e00\u53e5\u8bdd：C \u4e2d"\u6709\u7b26\u53f7 vs \u65e0\u7b26\u53f7"\u6df7\u5408\u6bd4\u8f83\/\u8fd0\u7b97\u65f6，\u6709\u7b26\u53f7\u6570\u4f1a\u9690\u5f0f\u63d0\u5347\u4e3a\u65e0\u7b26\u53f7（C \u7684"\u5bfb\u5e38\u7b97\u672f\u8f6c\u6362"\u89c4\u5219）\u3002\u8d1f\u6570\u53d8\u8d85\u5927\u6b63\u6570，\u6bd4\u8f83\u7ed3\u679c\u5b8c\u5168\u53cd\u76f4\u89c9\u3002\u89e3\u6cd5：\u7edf\u4e00\u7c7b\u578b\u518d\u6bd4\u8f83\u2014\u2014\u8981\u4e48\u90fd\u8f6c\u6709\u7b26\u53f7（\u4e14\u5148\u5224\u975e\u8d1f），\u8981\u4e48\u90fd\u7528\u65e0\u7b26\u53f7\u5e76\u5bf9\u8d1f\u6570\u5355\u72ec\u5904\u7406，\u675c\u7edd\u9690\u5f0f\u6df7\u6bd4\u3002<\/p>\n

\u9002\u7528\u8bfb\u8005：\u5199 if (a < b) \u5176\u4e2d a \u662f int\u3001b \u662f uint32，\u51fa\u73b0"\u8d1f\u6570\u6bd4\u8f83\u53cd\u5e38"\u7684\u540c\u5b66\u3002
\n\u8bfb\u5b8c\u4f60\u80fd\u505a：\u8bc6\u522b\u6709\u7b26\u53f7\/\u65e0\u7b26\u53f7\u6df7\u6bd4\u9677\u9631，\u7edf\u4e00\u7c7b\u578b\u6216\u62c6\u5206\u5224\u65ad，\u907f\u514d\u8d1f\u6570\u88ab\u5f53\u5927\u6b63\u6570\u653e\u8fc7\u3002<\/p>\n

\u4e8c\u3001\u5148\u641e\u61c2：C \u7684\u5bfb\u5e38\u7b97\u672f\u8f6c\u6362（\u8ba4\u77e5）<\/h3>\n

2.1 \u6df7\u6bd4\u65f6\u53d1\u751f\u4ec0\u4e48<\/h4>\n

\u5f53\u8868\u8fbe\u5f0f\u91cc\u540c\u65f6\u6709\u7b26\u53f7\u548c\u65e0\u7b26\u53f7\u64cd\u4f5c\u6570（\u4e14\u65e0\u7b26\u53f7\u7c7b\u578b"\u79e9"\u4e0d\u4f4e\u4e8e\u6709\u7b26\u53f7），\u6709\u7b26\u53f7\u64cd\u4f5c\u6570\u88ab\u8f6c\u6362\u6210\u65e0\u7b26\u53f7\u3002\u4e8e\u662f int -1 \u5728\u6bd4\u8f83\u65f6\u53d8\u6210 unsigned 0xFFFFFFFF，\u6bd4\u4efb\u4f55\u6b63\u5e38\u6b63\u6570\u90fd\u5927\u3002<\/p>\n

2.2 \u4e3a\u4ec0\u4e48\u5371\u9669<\/h4>\n

\u5f88\u591a\u4e1a\u52a1\u903b\u8f91\u7528\u8d1f\u6570\u8868\u793a"\u9519\u8bef\u7801"（\u5982 -1）\u3002\u4e00\u65e6\u548c\u65e0\u7b26\u53f7\u6bd4\u8f83，\u8d1f\u6570\u53d8\u8d85\u5927\u6b63\u6570 \u2192 \u672c\u8be5\u62e6\u622a\u7684\u975e\u6cd5\u503c\u88ab\u653e\u884c \u2192 \u8d8a\u754c\/\u5d29\u6e83\u3002<\/p>\n\n\u6bd4\u8f83\u7ed3\u679c<\/tr>\n\n\n\n
int -1 < uint 256（\u6df7\u6bd4）<\/td>\nfalse（\u9519）<\/td>\n<\/tr>\n
(int)-1 < (int)256（\u540c\u53f7）<\/td>\ntrue（\u5bf9）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

#mermaid-svg-MVGSSTJFd7Ml8qqb{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-MVGSSTJFd7Ml8qqb .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-MVGSSTJFd7Ml8qqb .error-icon{fill:#552222;}#mermaid-svg-MVGSSTJFd7Ml8qqb .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-MVGSSTJFd7Ml8qqb .marker{fill:#333333;stroke:#333333;}#mermaid-svg-MVGSSTJFd7Ml8qqb .marker.cross{stroke:#333333;}#mermaid-svg-MVGSSTJFd7Ml8qqb svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-MVGSSTJFd7Ml8qqb p{margin:0;}#mermaid-svg-MVGSSTJFd7Ml8qqb .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-MVGSSTJFd7Ml8qqb .cluster-label text{fill:#333;}#mermaid-svg-MVGSSTJFd7Ml8qqb .cluster-label span{color:#333;}#mermaid-svg-MVGSSTJFd7Ml8qqb .cluster-label span p{background-color:transparent;}#mermaid-svg-MVGSSTJFd7Ml8qqb .label text,#mermaid-svg-MVGSSTJFd7Ml8qqb span{fill:#333;color:#333;}#mermaid-svg-MVGSSTJFd7Ml8qqb .node rect,#mermaid-svg-MVGSSTJFd7Ml8qqb .node circle,#mermaid-svg-MVGSSTJFd7Ml8qqb .node ellipse,#mermaid-svg-MVGSSTJFd7Ml8qqb .node polygon,#mermaid-svg-MVGSSTJFd7Ml8qqb .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-MVGSSTJFd7Ml8qqb .rough-node .label text,#mermaid-svg-MVGSSTJFd7Ml8qqb .node .label text,#mermaid-svg-MVGSSTJFd7Ml8qqb .image-shape .label,#mermaid-svg-MVGSSTJFd7Ml8qqb .icon-shape .label{text-anchor:middle;}#mermaid-svg-MVGSSTJFd7Ml8qqb .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-MVGSSTJFd7Ml8qqb .rough-node .label,#mermaid-svg-MVGSSTJFd7Ml8qqb .node .label,#mermaid-svg-MVGSSTJFd7Ml8qqb .image-shape .label,#mermaid-svg-MVGSSTJFd7Ml8qqb .icon-shape .label{text-align:center;}#mermaid-svg-MVGSSTJFd7Ml8qqb .node.clickable{cursor:pointer;}#mermaid-svg-MVGSSTJFd7Ml8qqb .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-MVGSSTJFd7Ml8qqb .arrowheadPath{fill:#333333;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-MVGSSTJFd7Ml8qqb .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-MVGSSTJFd7Ml8qqb .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-MVGSSTJFd7Ml8qqb .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-MVGSSTJFd7Ml8qqb .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-MVGSSTJFd7Ml8qqb .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-MVGSSTJFd7Ml8qqb .cluster text{fill:#333;}#mermaid-svg-MVGSSTJFd7Ml8qqb .cluster span{color:#333;}#mermaid-svg-MVGSSTJFd7Ml8qqb div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-MVGSSTJFd7Ml8qqb .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-MVGSSTJFd7Ml8qqb rect.text{fill:none;stroke-width:0;}#mermaid-svg-MVGSSTJFd7Ml8qqb .icon-shape,#mermaid-svg-MVGSSTJFd7Ml8qqb .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-MVGSSTJFd7Ml8qqb .icon-shape p,#mermaid-svg-MVGSSTJFd7Ml8qqb .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-MVGSSTJFd7Ml8qqb .icon-shape rect,#mermaid-svg-MVGSSTJFd7Ml8qqb .image-shape rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-MVGSSTJFd7Ml8qqb .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-MVGSSTJFd7Ml8qqb .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-MVGSSTJFd7Ml8qqb :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/span><\/p>\n

\u6df7\u6bd4 \u9690\u8f6c\u65e0\u7b26\u53f7<\/p>\n

<\/span><\/p>\n

\u90fd\u8f6c\u6709\u7b26\u53f7<\/p>\n

<\/span><\/p>\n

int a \u4e0e uint b \u6bd4<\/p>\n

<\/span><\/p>\n

\u7c7b\u578b\u7edf\u4e00?<\/p>\n

<\/span><\/p>\n

a\u8d1f\u6570\u53d8\u8d85\u5927 \u6bd4\u8f83\u53cd<\/p>\n

<\/span><\/p>\n

\u6b63\u5e38<\/p>\n

<\/span><\/p>\n

\u56fe 1：\u6709\u7b26\u53f7\u65e0\u7b26\u53f7\u6df7\u6bd4（\u5982\u56fe 1 \u6240\u793a，\u9690\u8f6c\u65e0\u7b26\u53f7\u81f4\u8d1f\u6570\u53d8\u8d85\u5927）\u3002<\/p>\n

[\u6ce8\u610f] \u8f6c\u6362\u89c4\u5219\u8fd8\u548c\u7c7b\u578b\u5bbd\u5ea6\u6709\u5173（\u5982 int \u4e0e unsigned int \u540c\u5bbd\u5219\u8f6c\u65e0\u7b26\u53f7；int \u4e0e unsigned long long \u4e5f\u8f6c\u65e0\u7b26\u53f7）\u3002\u7f16\u8bd1\u5668\u5e38\u5f00 -Wsign-compare \u8b66\u544a，\u52a1\u5fc5\u6253\u5f00\u3002<\/p>\n

\u4e09\u3001\u4e3a\u4ec0\u4e48\u53cd\u5e38（\u539f\u7406 + \u771f\u5b9e\u9519\u8bef\u4ee3\u7801）<\/h3>\n

3.1 \u9519\u8bef\u7248<\/h4>\n

\/\/ \u274c \u9519：int \u4e0e uint \u6df7\u6bd4<\/span>
\nint<\/span> len =<\/span> read_len<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u8bfb\u9519\u8fd4\u56de -1<\/span>
\nuint32_t<\/span> max =<\/span> 256<\/span>;<\/span>
\nif<\/span> (<\/span>len <<\/span> max)<\/span> {<\/span> \/\/ len=-1 \u88ab\u8f6c\u65e0\u7b26\u53f7=0xFFFFFFFF > 256 \u2192 false<\/span>
\n process<\/span>(<\/span>len)<\/span>;<\/span> \/\/ \u8d1f\u6570\u88ab\u653e\u884c！\u8d8a\u754c<\/span>
\n}<\/span><\/p>\n

\u9519：\u2460len=-1；\u2461\u4e0e uint32_t max \u6bd4\u8f83，\u9690\u8f6c\u65e0\u7b26\u53f7 0xFFFFFFFF；\u24620xFFFFFFFF < 256 \u4e3a false \u2192 \u8d1f\u6570\u6f0f\u68c0；\u2463process(-1) \u8d8a\u754c\u8bbf\u95ee\u3002<\/p>\n

[\u5751] \u94c1\u5f8b：\u6709\u7b26\u53f7\u65e0\u7b26\u53f7\u6df7\u6bd4，\u8d1f\u6570\u53d8\u8d85\u5927\u6b63\u6570\u3002\u6bd4\u8f83\u524d\u7edf\u4e00\u7c7b\u578b，\u8d1f\u6570\u5148\u5355\u72ec\u5224\u3002<\/p>\n

3.2 \u4e3a\u4ec0\u4e48"\u770b\u4f3c\u6b63\u5e38"<\/h4>\n

\u53ea\u6709 len \u4e3a\u8d1f\u624d\u66b4\u9732；\u6b63\u5e38\u6b63\u6570\u533a\u95f4\u6bd4\u8f83\u7ed3\u679c"\u6070\u597d\u5bf9"，\u63a9\u76d6\u4e86\u9690\u60a3 \u2192 \u5076\u53d1（\u8bfb\u9519\u65f6\u624d\u5d29）\u3002<\/p>\n

\u4e0b\u9762\u662f\u9519\u8bef\u4ee3\u7801\u7684\u6267\u884c\u6d41\u7a0b，\u53ef\u4ee5\u770b\u5230\u8d1f\u6570\u5982\u4f55\u88ab\u9690\u5f0f\u8f6c\u6362\u540e\u6f0f\u68c0：<\/p>\n

#mermaid-svg-6aTbkZzrQ6NhVP47{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-6aTbkZzrQ6NhVP47 .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-6aTbkZzrQ6NhVP47 .error-icon{fill:#552222;}#mermaid-svg-6aTbkZzrQ6NhVP47 .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-6aTbkZzrQ6NhVP47 .marker{fill:#333333;stroke:#333333;}#mermaid-svg-6aTbkZzrQ6NhVP47 .marker.cross{stroke:#333333;}#mermaid-svg-6aTbkZzrQ6NhVP47 svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-6aTbkZzrQ6NhVP47 p{margin:0;}#mermaid-svg-6aTbkZzrQ6NhVP47 .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-6aTbkZzrQ6NhVP47 .cluster-label text{fill:#333;}#mermaid-svg-6aTbkZzrQ6NhVP47 .cluster-label span{color:#333;}#mermaid-svg-6aTbkZzrQ6NhVP47 .cluster-label span p{background-color:transparent;}#mermaid-svg-6aTbkZzrQ6NhVP47 .label text,#mermaid-svg-6aTbkZzrQ6NhVP47 span{fill:#333;color:#333;}#mermaid-svg-6aTbkZzrQ6NhVP47 .node rect,#mermaid-svg-6aTbkZzrQ6NhVP47 .node circle,#mermaid-svg-6aTbkZzrQ6NhVP47 .node ellipse,#mermaid-svg-6aTbkZzrQ6NhVP47 .node polygon,#mermaid-svg-6aTbkZzrQ6NhVP47 .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-6aTbkZzrQ6NhVP47 .rough-node .label text,#mermaid-svg-6aTbkZzrQ6NhVP47 .node .label text,#mermaid-svg-6aTbkZzrQ6NhVP47 .image-shape .label,#mermaid-svg-6aTbkZzrQ6NhVP47 .icon-shape .label{text-anchor:middle;}#mermaid-svg-6aTbkZzrQ6NhVP47 .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-6aTbkZzrQ6NhVP47 .rough-node .label,#mermaid-svg-6aTbkZzrQ6NhVP47 .node .label,#mermaid-svg-6aTbkZzrQ6NhVP47 .image-shape .label,#mermaid-svg-6aTbkZzrQ6NhVP47 .icon-shape .label{text-align:center;}#mermaid-svg-6aTbkZzrQ6NhVP47 .node.clickable{cursor:pointer;}#mermaid-svg-6aTbkZzrQ6NhVP47 .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-6aTbkZzrQ6NhVP47 .arrowheadPath{fill:#333333;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-6aTbkZzrQ6NhVP47 .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-6aTbkZzrQ6NhVP47 .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-6aTbkZzrQ6NhVP47 .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-6aTbkZzrQ6NhVP47 .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-6aTbkZzrQ6NhVP47 .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-6aTbkZzrQ6NhVP47 .cluster text{fill:#333;}#mermaid-svg-6aTbkZzrQ6NhVP47 .cluster span{color:#333;}#mermaid-svg-6aTbkZzrQ6NhVP47 div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-6aTbkZzrQ6NhVP47 .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-6aTbkZzrQ6NhVP47 rect.text{fill:none;stroke-width:0;}#mermaid-svg-6aTbkZzrQ6NhVP47 .icon-shape,#mermaid-svg-6aTbkZzrQ6NhVP47 .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-6aTbkZzrQ6NhVP47 .icon-shape p,#mermaid-svg-6aTbkZzrQ6NhVP47 .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-6aTbkZzrQ6NhVP47 .icon-shape rect,#mermaid-svg-6aTbkZzrQ6NhVP47 .image-shape rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-6aTbkZzrQ6NhVP47 .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-6aTbkZzrQ6NhVP47 .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-6aTbkZzrQ6NhVP47 :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/span><\/p>\n

\u662f（\u5982 -1）<\/p>\n

<\/span><\/span><\/p>\n

false（\u9519）<\/p>\n

<\/span><\/span><\/p>\n

\u5426（\u6b63\u6570）<\/p>\n

<\/span><\/p>\n

int len = read_len()<\/p>\n

<\/span><\/p>\n

len < 0 ?<\/p>\n

<\/span><\/p>\n

len \u9690\u5f0f\u8f6c unsigned 0xFFFFFFFF<\/p>\n

<\/span><\/p>\n

0xFFFFFFFF < 256 ?<\/p>\n

<\/span><\/p>\n

\u8d1f\u6570\u88ab\u653e\u884c<\/p>\n

<\/span><\/p>\n

process(-1) \u8d8a\u754c\u8bbf\u95ee<\/p>\n

<\/span><\/p>\n

\u6b63\u5e38\u6bd4\u8f83<\/p>\n

<\/span><\/p>\n

\u56fe 2：\u9519\u8bef\u7248\u6267\u884c\u6d41\u7a0b（\u8d1f\u6570\u7ecf\u9690\u5f0f\u8f6c\u65e0\u7b26\u53f7\u540e\u6f0f\u68c0）\u3002<\/p>\n

\u56db\u3001\u6b63\u786e\u89e3\u6cd5：\u7edf\u4e00\u7c7b\u578b + \u5148\u5224\u8d1f（\u5b8c\u6574\u843d\u5730）<\/h3>\n

4.1 \u65b9\u6848\u5bf9\u6bd4<\/h4>\n\n\u65b9\u6848\u8d1f\u6570\u5b89\u5168\u8bf4\u660e<\/tr>\n\n\n\n
\u6df7\u6bd4<\/td>\n\u6f0f\u8d1f<\/td>\n\u9519<\/td>\n<\/tr>\n
\u5148\u5224\u8d1f+\u540c\u53f7\u6bd4<\/td>\n\u5b89\u5168<\/td>\n\u6b63\u89e3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4.2 \u914d\u7f6e（\u7167\u7740\u70b9）<\/h4>\n

\u5f00\u7f16\u8bd1\u8b66\u544a -Wsign-compare（GCC），\u6df7\u6bd4\u4f1a\u88ab\u8b66\u544a\u3002<\/p>\n

4.3 \u5b8c\u6574\u4ee3\u7801<\/h4>\n

\/\/ \u2705 \u6b63\u786e：\u5148\u5224\u8d1f，\u518d\u7528\u540c\u53f7\u6bd4\u8f83<\/span>
\nint<\/span> len =<\/span> read_len<\/span>(<\/span>)<\/span>;<\/span> \/\/ -1 \u8868\u793a\u9519<\/span>
\nif<\/span> (<\/span>len <<\/span> 0<\/span>)<\/span> {<\/span> handle_error<\/span>(<\/span>)<\/span>;<\/span> return<\/span>;<\/span> }<\/span> \/\/ \u8d1f\u6570\u5355\u72ec\u62e6<\/span>
\nif<\/span> (<\/span>(<\/span>uint32_t<\/span>)<\/span>len <<\/span> max)<\/span> {<\/span> \/\/ \u90fd\u65e0\u7b26\u53f7，\u8bed\u4e49\u6e05\u6670<\/span>
\n process<\/span>(<\/span>(<\/span>uint32_t<\/span>)<\/span>len)<\/span>;<\/span>
\n}<\/span>
\n\/\/ \u6216\u90fd\u7528\u6709\u7b26\u53f7（max \u4e0d\u8d85\u8fc7 INT_MAX \u65f6）<\/span>
\nif<\/span> (<\/span>len >=<\/span> 0<\/span> &&<\/span> len <<\/span> (<\/span>int<\/span>)<\/span>max)<\/span> {<\/span> process<\/span>(<\/span>len)<\/span>;<\/span> }<\/span><\/p>\n

[\u5751] \u4e24\u4e2a\u7ffb\u8f66\u70b9\u6536\u597d：<\/p>\n

  • int \u4e0e uint \u76f4\u63a5\u6bd4\u8f83\u2014\u2014\u8d1f\u6570\u6f0f\u68c0\u6839\u56e0；\u7edf\u4e00\u7c7b\u578b\/\u5148\u5224\u8d1f\u3002<\/li>\n
  • \u5ffd\u7565 -Wsign-compare \u8b66\u544a\u2014\u2014\u9690\u60a3\u6f5c\u4f0f；\u5f00\u8b66\u544a\u5e76\u4fee\u6389\u6240\u6709\u6df7\u6bd4\u3002<\/li>\n

    4.4 \u6539\u5b8c\u5bf9\u6bd4<\/h4>\n\n\u6307\u6807\u6539\u524d\u6539\u540e<\/tr>\n\n\n\n
    len=-1 \u6bd4\u8f83<\/td>\n\u653e\u884c（\u9519）<\/td>\n\u62e6\u622a<\/td>\n<\/tr>\n
    \u8d1f\u6570\u8d8a\u754c<\/td>\n\u6709<\/td>\n\u65e0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u4e0b\u9762\u662f\u6b63\u786e\u89e3\u6cd5\u7684\u5224\u65ad\u6d41\u7a0b，\u5148\u5224\u8d1f\u518d\u7edf\u4e00\u7c7b\u578b\u6bd4\u8f83：<\/p>\n

    #mermaid-svg-MI7IcgBIQDLNtFIx{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-MI7IcgBIQDLNtFIx .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-MI7IcgBIQDLNtFIx .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-MI7IcgBIQDLNtFIx .error-icon{fill:#552222;}#mermaid-svg-MI7IcgBIQDLNtFIx .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-MI7IcgBIQDLNtFIx .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-MI7IcgBIQDLNtFIx .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-MI7IcgBIQDLNtFIx .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-MI7IcgBIQDLNtFIx .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-MI7IcgBIQDLNtFIx .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-MI7IcgBIQDLNtFIx .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-MI7IcgBIQDLNtFIx .marker{fill:#333333;stroke:#333333;}#mermaid-svg-MI7IcgBIQDLNtFIx .marker.cross{stroke:#333333;}#mermaid-svg-MI7IcgBIQDLNtFIx svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-MI7IcgBIQDLNtFIx p{margin:0;}#mermaid-svg-MI7IcgBIQDLNtFIx .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-MI7IcgBIQDLNtFIx .cluster-label text{fill:#333;}#mermaid-svg-MI7IcgBIQDLNtFIx .cluster-label span{color:#333;}#mermaid-svg-MI7IcgBIQDLNtFIx .cluster-label span p{background-color:transparent;}#mermaid-svg-MI7IcgBIQDLNtFIx .label text,#mermaid-svg-MI7IcgBIQDLNtFIx span{fill:#333;color:#333;}#mermaid-svg-MI7IcgBIQDLNtFIx .node rect,#mermaid-svg-MI7IcgBIQDLNtFIx .node circle,#mermaid-svg-MI7IcgBIQDLNtFIx .node ellipse,#mermaid-svg-MI7IcgBIQDLNtFIx .node polygon,#mermaid-svg-MI7IcgBIQDLNtFIx .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-MI7IcgBIQDLNtFIx .rough-node .label text,#mermaid-svg-MI7IcgBIQDLNtFIx .node .label text,#mermaid-svg-MI7IcgBIQDLNtFIx .image-shape .label,#mermaid-svg-MI7IcgBIQDLNtFIx .icon-shape .label{text-anchor:middle;}#mermaid-svg-MI7IcgBIQDLNtFIx .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-MI7IcgBIQDLNtFIx .rough-node .label,#mermaid-svg-MI7IcgBIQDLNtFIx .node .label,#mermaid-svg-MI7IcgBIQDLNtFIx .image-shape .label,#mermaid-svg-MI7IcgBIQDLNtFIx .icon-shape .label{text-align:center;}#mermaid-svg-MI7IcgBIQDLNtFIx .node.clickable{cursor:pointer;}#mermaid-svg-MI7IcgBIQDLNtFIx .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-MI7IcgBIQDLNtFIx .arrowheadPath{fill:#333333;}#mermaid-svg-MI7IcgBIQDLNtFIx .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-MI7IcgBIQDLNtFIx .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-MI7IcgBIQDLNtFIx .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-MI7IcgBIQDLNtFIx .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-MI7IcgBIQDLNtFIx .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-MI7IcgBIQDLNtFIx .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-MI7IcgBIQDLNtFIx .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-MI7IcgBIQDLNtFIx .cluster text{fill:#333;}#mermaid-svg-MI7IcgBIQDLNtFIx .cluster span{color:#333;}#mermaid-svg-MI7IcgBIQDLNtFIx div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-MI7IcgBIQDLNtFIx .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-MI7IcgBIQDLNtFIx rect.text{fill:none;stroke-width:0;}#mermaid-svg-MI7IcgBIQDLNtFIx .icon-shape,#mermaid-svg-MI7IcgBIQDLNtFIx .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-MI7IcgBIQDLNtFIx .icon-shape p,#mermaid-svg-MI7IcgBIQDLNtFIx .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-MI7IcgBIQDLNtFIx .icon-shape rect,#mermaid-svg-MI7IcgBIQDLNtFIx .image-shape rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-MI7IcgBIQDLNtFIx .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-MI7IcgBIQDLNtFIx .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-MI7IcgBIQDLNtFIx :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/span><\/p>\n

    \u662f<\/p>\n

    <\/span><\/p>\n

    \u5426<\/p>\n

    <\/span><\/p>\n

    \u662f<\/p>\n

    <\/span><\/p>\n

    \u5426<\/p>\n

    <\/span><\/p>\n

    int len = read_len()<\/p>\n

    <\/span><\/p>\n

    len < 0 ?<\/p>\n

    <\/span><\/p>\n

    handle_error() \u62e6\u622a<\/p>\n

    <\/span><\/p>\n

    (uint32_t)len < max ?<\/p>\n

    <\/span><\/p>\n

    process(len) \u5b89\u5168\u5904\u7406<\/p>\n

    <\/span><\/p>\n

    \u8d85\u9650\u62d2\u7edd<\/p>\n

    <\/span><\/p>\n

    \u56fe 3：\u6b63\u786e\u7248\u6267\u884c\u6d41\u7a0b（\u5148\u5224\u8d1f，\u518d\u7edf\u4e00\u7c7b\u578b\u6bd4\u8f83）\u3002<\/p>\n

    \u4e94\u3001\u6536\u5c3e<\/h3>\n

    \u8981\u70b9\u590d\u76d8<\/p>\n

  • \u6709\u7b26\u53f7\u65e0\u7b26\u53f7\u6df7\u6bd4，\u8d1f\u6570\u9690\u8f6c\u65e0\u7b26\u53f7\u53d8\u8d85\u5927，\u6bd4\u8f83\u53cd\u76f4\u89c9\u3002<\/li>\n
  • \u6bd4\u8f83\u524d\u7edf\u4e00\u7c7b\u578b，\u8d1f\u6570\u5148\u5355\u72ec\u5224，\u522b\u6df7\u6bd4\u3002<\/li>\n
  • \u5f00 -Wsign-compare \u63d0\u524d\u6293\u6df7\u6bd4\u3002<\/li>\n

    \u6700\u4f73\u5b9e\u8df5\u6e05\u5355<\/p>\n

      \n
    • \u6bd4\u8f83\u524d\u786e\u4fdd\u4e24\u4fa7\u540c\u7b26\u53f7\u7c7b\u578b；\u8d1f\u6570\u8bed\u4e49\u5148\u5355\u72ec\u5904\u7406\u3002<\/li>\n
    • \u957f\u5ea6\/\u7d22\u5f15\u7528 size_t\/\u65e0\u7b26\u53f7\u65f6，\u8d1f\u6570\u9519\u8bef\u7801\u6539\u7528\u5355\u72ec\u6807\u5fd7\u6216\u4e0d\u540c\u53d8\u91cf\u3002<\/li>\n
    • \u5f00 -Wsign-compare -Wconversion \u8b66\u544a\u5e76\u6e05\u96f6\u3002<\/li>\n
    • \u6570\u7ec4\u7d22\u5f15\u7528\u65e0\u7b26\u53f7，\u4f46\u8bfb\u5165\u503c\u5148\u5728\u6709\u7b26\u53f7\u57df\u5224\u8303\u56f4\u518d\u8f6c\u3002<\/li>\n
    • \u4ee3\u7801\u5ba1\u67e5\u91cd\u70b9\u67e5 if (int_x < uint_y) \u5f62\u5f0f\u3002<\/li>\n<\/ul>\n

      \u8fdb\u9636\u5ef6\u4f38：C23 \u6709 _BitInt\/\u66f4\u4e25\u683c\u7c7b\u578b；\u9759\u6001\u5206\u6790（PC-lint\u3001Cppcheck）\u80fd\u6293\u6df7\u6bd4\u3002\u5927\u578b\u9879\u76ee\u7edf\u4e00"\u7d22\u5f15\u7528 size_t\u3001\u9519\u8bef\u7528\u8d1f\u7801\u5206\u53d8\u91cf"\u7684\u7f16\u7801\u89c4\u8303\u3002<\/p>\n

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