[Bug gdb/15678] Typing "enable count" crashes gdb

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=15678

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Simon Marchi <simark@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b9d6130764916fac3d9bcfde2d672053a0ef3316

commit b9d6130764916fac3d9bcfde2d672053a0ef3316
Author: Simon Marchi <simon.marchi@ericsson.com>
Date:   Mon Feb 2 14:57:31 2015 -0500

    "enable count" user input error handling (PR gdb/15678)

    Typing "enable count" by itself crashes GDB. Also, if you omit the
    breakpoint number/range, the error message is not very clear:

    (gdb) enable count 2
    warning: bad breakpoint number at or near ''
    (gdb) enable count
    Segmentation fault (core dumped)

    With this patch, the error messages are slightly more helpful:

    (gdb) enable count 2
    Argument required (one or more breakpoint numbers).
    (gdb) enable count
    Argument required (hit count).

    gdb/ChangeLog:

        PR gdb/15678
        * breakpoint.c (map_breakpoint_numbers): Check for empty args
        string.
        (enable_count_command): Check args for NULL value.

    gdb/testsuite/ChangeLog:

        PR gdb/15678
        * gdb.base/ena-dis-br.exp: Test "enable count" for bad user input.

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