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List:       busybox-cvs
Subject:    [Bug 11436] New: ash ${var/X/$c} skips replacement bytes
From:       bugzilla () busybox ! net
Date:       2018-10-25 17:33:17
Message-ID: bug-11436-161 () https ! bugs ! busybox ! net/
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https://bugs.busybox.net/show_bug.cgi?id=11436

            Bug ID: 11436
           Summary: ash ${var/X/$c} skips replacement bytes
           Product: Busybox
           Version: 1.29.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned@busybox.net
          Reporter: Andreas.Klauer@metamorpher.de
                CC: busybox-cvs@busybox.net
  Target Milestone: ---

busybox:

    ~ $ var=fooXbar
    ~ $ echo ${var/X/$(printf "\x33\x88\x33\x88")}
    foo33bar
    ~ $ echo ${var/X/$(printf "\x33\x88\x33\x88")} | hexdump -C
    00000000  66 6f 6f 33 33 62 61 72  0a                       |foo33bar.|
    00000009

why is 0x88 skipped?

these bytes appear in some UTF-8 characters.

using
https://busybox.net/downloads/binaries/1.28.1-defconfig-multiarch/busybox-x86_64
it even segfaults

    ~ $ x=x
    ~ $ echo ${x/x/裁}
    Segmentation fault

but in my local version it just removes a byte

    $ echo ${x/x/裁}
    è �

as a workaround, I no longer use ${/} to replace characters.

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