如何确定 ANSI 终端的大小? [英] How do I determine size of ANSI terminal?

问题描述

标准输入和输出连接到一个终端，该终端实现了 ANSI 转义序列，但维度未知.

Standard input and output are connected to a terminal that implements ANSI escape sequences, but is of unknown dimensions.

我需要知道终端有多大，以便于在其上绘制全屏文本 UI.我如何获得尺寸?

I need to know how big the terminal so to facilitate drawing a full-screen text UI on it. How can I get the size?

正确的大小没有加载到环境变量中.我不能使用 TIOCGETS；调用将返回成功但值不正确——内核也不知道大小.

The correct size is not loaded into environment variables. I cannot use TIOCGETS; the the call would return success but the values are not correct -- the kernel doesn't know the size either.

搜索 stackoverflow 有很多答案，但它们都取决于操作系统以一种或另一种方式提供答案；但这一次不是真的.

There are lots and lots of answers searching stackoverflow, but they all depend on the OS providing the answer one way or anther; but this time that is not true.

我能找到的最好的线索是返回当前光标位置的 DSR 命令；但没有移动到底部/右侧命令.

The best clue I can find is the DSR command which returns the current cursor position; but there's no move to bottom/right command.

推荐答案

resize 程序通过将光标移动到一个非常大的列和行来做到这一点；终端尽可能地移动，例如，

The resize program does this by moving the cursor to a very large column and row; the terminal moves as far as it can, e.g.,

CUP 999 999

然后resize询问光标在哪里:

DSR 6

终端回复实际光标位置(即光标位置报告CPR)，从中resize知道终端的大小:光标在下方-右上角.

The terminal replies with the actual cursor position (i.e., the cursor position report CPR), from which resize knows the terminal's size: the cursor is on the lower-right corner.

这一切都使用标准 (ECMA-48/VT100) 转义序列.在 XTerm Control Sequences(应该适用于您的ANSI"终端)>

That's all done using standard (ECMA-48 / VT100) escape sequences. In XTerm Control Sequences (which should apply to your "ANSI" terminal)

CSI Ps n  Device Status Report (DSR).
            Ps = 6  -> Report Cursor Position (CPR) [row;column].
          Result is CSI r ; c R

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