sprintf使用中的段错误
我正在尝试从数据包有效负载中读取其用户代理。
我正在数据包有效负载中搜索“User-Agent”，然后从那时起复制“User-Agent”出现和之后第一次出现“\n”之间的尽可能多的字符。这是我的代码：
sprintf(
stat,"%.*s\0",
strstr(strstr(p->data, "User-Agent:"),"\n") - strstr(p->data, "User-Agent:"),
strstr(p->data, "User-Agent: ")
);
问题是，对于很多数据包，这会导致段错误。我对这种愚蠢的写法感到抱歉；如果您知道更好的书写方式（或格式），请告诉我。
I am trying to read from a packet payload just its User agent.
I am searching for "User-Agent" in packet payload and and from then on copying as many chars as there are between the occurrence of "User-Agent" and the first occurrence of '\n' right after that. Here's my code:
sprintf(
stat,"%.*s\0",
strstr(strstr(p->data, "User-Agent:"),"\n") - strstr(p->data, "User-Agent:"),
strstr(p->data, "User-Agent: ")
);
The trouble is that for a LOT of packets, this is causing seg fault. I am sorry for this silly way to write it; if you know a better way to write (or format), please tell me.
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为什么要编写如此复杂的代码？指针关节炎可能会指向会产生段错误的东西。考虑重构代码。
Why are you writing code that is so complex? The pointer arthritic could end end pointing to something that will give a seg fault. Consider refactoring the code.