c++ - 根据 C 标准，fprintf、fputs...在 Windows 上的功能是否合法？

Question

我想知道:为什么用标准库写入文件会将您的 \n 转换为 \r\n？它是根据 C99 的标准行为还是 MS 添加的“commidity”？如果它是标准的，按照旧的 Apple 约定 (\r)，将 "toto\n" 写入文件 write "toto\r"?当前的行为是为了让您可以读取 UNIX 文件但 UNIX 无法读取您的文件吗？(我喜欢阴谋论)

Answer 1

1. why does writing in a file with the standard lib converts your \n into \r\n?

   是为了让代码更便携；您可以在您的程序中使用 \n 并让它在 UNIX、Windows、Mac 和(据说)其他任何东西上运行。

2. Is it standard behaviour according C99 or a "commidity" added by MS?

   是的，这是标准的。

3. If it is standard, with the old Apple convention (\r), would writing "toto\n" to a file write "toto\r"?

   是的，需要翻译行尾字符。

4. Is the current behaviour here so that you could read UNIX file but UNIXes could not read yours?

   不，没有阴谋。

来自 C11 规范，§7.21.2 流，¶2:

… Characters may have to be added, altered, or deleted on input and output to conform to differing conventions for representing text in the host environment. Thus, there need not be a one-to-one correspondence between the characters in a stream and those in the external representation. …

如果您不希望出现这种情况，请将您的文件作为二进制流而不是文本流打开。