EDIT: Older versions of editline were quite simple. Here's one with just two C files and a header, a total of about 1500 lines of code. We've been using it for years.
Most systems have readline installed, so I don't see that as being too much of an issue.
Secondly, I don't think there's any drop-in replacement for the GNU Readline library. You're going to have to stick with it. :(
Edit 5/11/2016: This answer is outdated, and any edit I'd make would be borrowing almost completely from the other, more correct answers. Summary: see linenoise and editline for modern readline alternatives.
BusyBox contains command line editing code similar to readline, but much smaller and simpler, with full support for UTF-8. It would probably be easy to make it into an independent library.
The editline library is yet another alternative. From the README:
The editline library was created by Simmule Turner and Rich Salz back in 1992. At the time they chose to distribute the code under a "C News-like" copyright, see the file LICENSE for details.
[...]
This version of the editline library is a fork off the Minix3 sources. Other know versions, often based off of the original comp.sources.unix posting are:
我也同意 Dan Loewenherz 的观点，readline 图书馆分布广泛。例如，大多数 Linux 发行版都附带了 bash 和 readline。大多数 python 发行版还附带 readline。如果您的项目需要类似 readline 的库，那么最好使用 GNU readline 库，因为它是一个流行的选择，并且用户可能已经将其安装在操作系统上。
editline(libedit) doesn't support multi-byte characters yet.
I also agree with Dan Loewenherz, the readline library is wide spread. For example, most linux distribution ships bash with readline. Most python distribution also ships with readline. If your project needs a readline-like library, it's a good idea to use GNU readline library since it's a popular choice and users may have it installed on the OS already.
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编辑行。它有 BSD 风格的许可证。
编辑： 旧版本的 editline 非常简单。这是一个只有两个 C 文件和一个标头，总共约1500行代码。我们已经使用它很多年了。
Editline. It has a BSD-style license.
EDIT: Older versions of editline were quite simple. Here's one with just two C files and a header, a total of about 1500 lines of code. We've been using it for years.
我找到了一个。 Redis 的 antirez 提出了 linenoise，这是一个更简单的替代方案。
I found one. antirez of Redis fame has come up with linenoise, a much simpler alternative.
大多数系统都安装了 readline，所以我不认为这是一个太大的问题。
其次，我不认为 GNU Readline 库有任何直接替代品。你必须坚持下去。 :(
编辑 5/11/2016：这个答案已经过时了，我所做的任何编辑几乎完全借用其他更正确的答案。摘要：参见 linenoise 和 editline 用于现代阅读行替代方案。
Most systems have readline installed, so I don't see that as being too much of an issue.
Secondly, I don't think there's any drop-in replacement for the GNU Readline library. You're going to have to stick with it. :(
Edit 5/11/2016: This answer is outdated, and any edit I'd make would be borrowing almost completely from the other, more correct answers. Summary: see linenoise and editline for modern readline alternatives.
BusyBox 包含类似于 readline 的命令行编辑代码，但更小、更简单，完全支持 UTF-8。将其变成一个独立的库可能很容易。
BusyBox contains command line editing code similar to readline, but much smaller and simpler, with full support for UTF-8. It would probably be easy to make it into an independent library.
editline 库是另一种选择。来自 自述文件：
[...]
The editline library is yet another alternative. From the README:
[...]
editline(libedit) 尚不支持多字节字符。
我也同意 Dan Loewenherz 的观点，readline 图书馆分布广泛。例如，大多数 Linux 发行版都附带了 bash 和 readline。大多数 python 发行版还附带 readline。如果您的项目需要类似 readline 的库，那么最好使用 GNU readline 库，因为它是一个流行的选择，并且用户可能已经将其安装在操作系统上。
editline(libedit) doesn't support multi-byte characters yet.
I also agree with Dan Loewenherz, the readline library is wide spread. For example, most linux distribution ships bash with readline. Most python distribution also ships with readline. If your project needs a readline-like library, it's a good idea to use GNU readline library since it's a popular choice and users may have it installed on the OS already.