是否可以使用fgets或gets_s正确读取空字符? [英] Is it possible to read null characters correctly using fgets or gets_s?

问题描述

假设我想从stdin中读取内容，并让用户输入包含空字符的字符串.使用像fgets或gets_s这样的字符串输入函数可以做到这一点吗?还是我必须使用例如fgetc或fread?

Suppose I want to read from stdin, and let the user input strings that contain null characters. Is this possible with string-input functions like fgets or gets_s? Or do I have to use e.g. fgetc or fread?

有人此处想要这样做.

推荐答案

是否可以使用fgets或gets_s正确读取空字符?

Is it possible to read null characters correctly using fgets or gets_s?

正如其他一些答案所示，答案显然是是的-几乎没有".同样，可以使用螺丝刀锤打钉子.同样，可以用C编写(相当于)BASIC或FORTRAN代码.

As some of the other answers show, the answer is apparently "Yes -- just barely." Similarly, it is possible to hammer in nails using a screwdriver. Similarly, it is possible to write (what amounts to) BASIC or FORTRAN code in C.

但是这些都不是一个好主意.使用正确的工具完成工作.如果要打钉子，请使用锤子.如果要编写BASIC或FORTRAN，请使用BASIC解释器或FORTRAN编译器.而且，如果您想读取可能包含空字符的二进制数据，请使用fread(或者可能是getc).不要使用fgets，因为它的接口从未设计用于此任务.

But none of these things is remotely a good idea. Use the right tool for the job. If you want to drive nails, use a hammer. If you want to write BASIC or FORTRAN, use a BASIC interpreter or a FORTRAN compiler. And if you want to read binary data that might contain null characters, use fread (or maybe getc). Don't use fgets, because its interface was never designed for this task.

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