Description of problem:

MAXLINE of ksh is not long enough

Version-Release number of selected component (if applicable):

ksh-20120801-28.el6.x86_64.rpm

[ENV]
# ksh
# echo $LANG
en_US.utf8

How reproducible:

Every time.

Steps to Reproduce:

In RHEL6.7 ksh, in the command line, when the LANG is utf-8, it seems that I can only input 1019 char(nearly to 1024).

In the following example, I have input "1234567890" by 101 times, but
continuely I can only input one "123456789" after that.

=========[example]==================================
# ksh
#
12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
===========================================

Actual results:

In RHEL6.7 ksh, in the command line, it seems that I can only input 1019
char(nearly to 1024).

Expected results:

Make it more such as 2048 or 4096 when using utf-8


Additional info:

After digging the src code, the *MAXLINE* is defined as following:

==================
src/cmd/ksh93/include/edit.h
：
63 #define MAXLINE 1024            /* longest edit line permitted */
：
==================

After make the MAXLINE more such as 2048, then re-compile a new rpm and install it on rhel6, then I can input more char in ksh cmd-line with utf-8.