设置 FILE* 是否等于 stdout 可移植? [英] Is setting a FILE* equal to stdout portable?

问题描述

我有一个函数需要能够写入标准输出或文件，这取决于用户想要什么.虽然它默认为标准输出.为此，我正在执行以下操作(减去错误检查等):

I've got a function that needs to be able to write to either stdout, or to a file, depending on what the user wants. It defaults to standard out though. To accomplish this, I'm doing the following (minus error checking etc):

FILE* out;
if (writeToFile) { /*Code to open file*/; }

else
    out = stdout;

// ...rest of the function goes here

if (out != stdout)
    fclose(out);

这当然可以解决问题，但我不知道它的便携性如何.如果不是，和/或还有其他问题，我应该如何处理?

This certainly does the trick, but I have no idea how portable it is. And if it's not, and/or there's another problem with it, how should I go about this?

推荐答案

是的，它是可移植的，而且很好，前提是你不要搞乱 *stdout 的低级实现(例如通过在 Posix 上调用 close(fileno(stdout)) 或使用 dup).

Yes, it's portable and it's fine, provided you don't also mess with the low-level implementation of *stdout (e.g. by calling close(fileno(stdout)) on Posix or using dup).

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