Unable to provide long (1024/4096+ character) inputs to the OCaml toplevel #5678
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Comment author: @diml This is not a limitation of OCaml but a limitation of the terminal. The standard toplevel does not implement line edition, so the buffered input of the terminal is used, and this one has a limited capacity. You can observe the same behavior with the command "cat" for example. In order to write long lines in the toplevel you have to launch it with a program like ledit or rlwrap, or you can also use utop. |
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Original bug ID: 5678
Reporter: antalsz
Assigned to: @diml
Status: closed (set by @xavierleroy on 2015-12-11T18:07:12Z)
Resolution: not a bug
Priority: normal
Severity: minor
Version: 3.12.1
Category: ~DO NOT USE (was: OCaml general)
Bug description
When using the OCaml toplevel, it will not accept more than 1024/4096 characters of input at a time. A line of input containing 1023/4095 characters can be followed by a return; a line of input containing 1024/4096 characters just beeps when any additional keys (letters, return, etc.) are pressed. Importantly, this only happens if OCaml is running interactively. Piping input in or reading input from a file does not cause any problems.
I've tested this on Mac OS X 10.6.7 and 10.7.4, with 3.12.1 from Homebrew (and 4.00.0+beta2 on the 10.6.7 system), I get this with 1024 characters every time. I believe the limit is 4096 characters on Linux systems, but I have not been able to check this directly (I have confirmed it second-hand).
Steps to reproduce
Generate a 1023/4095 character string, e.g. by running
perl -e 'print ((" " x 1020) . "1;;")'orperl -e 'print ((" " x 4092) . "1;;")'; copy and paste this into the top level; and try to continue typing.The text was updated successfully, but these errors were encountered: