[Bug libc/19432] iconv rejects redundant escape sequences in IBM900, IBM903, IBM905, IBM907, and IBM909

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https://sourceware.org/bugzilla/show_bug.cgi?id=19432

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=692de4b3960dc90bdcfb871513ee4d81d314cf69

commit 692de4b3960dc90bdcfb871513ee4d81d314cf69
Author: Martin Sebor <msebor@redhat.com>
Date:   Fri Jan 15 11:25:13 2016 -0700

    Have iconv accept redundant escape sequences in IBM900, IBM903, IBM905,
    IBM907, and IBM909.

    Patch for bug #17197 changes the encoder to avoid generating redundant
    shift sequences.  However, those sequences may already be present in
    data encododed by prior versions of the encoder.  This change modifies
    the decoder to also avoid rejecting redundant shift sequences.

            [BZ #19432]
            * iconvdata/Makefile: Add bug-iconv11.
            * iconvdata/bug-iconv11.c: New test.
            * iconvdata/ibm930.c: Do not reject redundant shift sequences.
            * iconvdata/ibm933.c: Same.
            * iconvdata/ibm935.c: Same.
            * iconvdata/ibm937.c: Same.
            * iconvdata/ibm939.c: Same.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog               |   11 +++++
 iconvdata/Makefile      |    2 +-
 iconvdata/bug-iconv11.c |  114 +++++++++++++++++++++++++++++++++++++++++++++++
 iconvdata/ibm930.c      |   14 +-----
 iconvdata/ibm933.c      |   14 +-----
 iconvdata/ibm935.c      |   14 +-----
 iconvdata/ibm937.c      |   14 +-----
 iconvdata/ibm939.c      |   14 +-----
 8 files changed, 136 insertions(+), 61 deletions(-)
 create mode 100644 iconvdata/bug-iconv11.c

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