[Bug gdb/21656] New: Missing last character when target-charset set to CP1255

["bgkweb at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21656

            Bug ID: 21656
           Summary: Missing last character when target-charset set to
                    CP1255
           Product: gdb
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: bgkweb at gmail dot com
  Target Milestone: ---

When the target charset is set to CP1255, strings are most of the time missing
their last character.

Reproduction steps:

$ gdb
GNU gdb (GDB) 8.0
This GDB was configured as "x86_64-pc-linux-gnu".
(gdb) show host-charset 
The host character set is "auto; currently UTF-8".
(gdb) set target-charset CP1255
(gdb) print "שתכננו"
$1 = "שתכננ"
(gdb) 

Notice how the last "ו" from the input string is missing. (Hebrew is a right to
left language, the last character is on the left in a browser)

This is most likely due to the fact that CP1255 is a stateful encoding in iconv
and the iconv conversion state is not flushed.

man 3 iconv explains iconv must be called a second time with inbuf = NULL to
flush the conversion state to the output buffer. See also #1124.

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