[Bug 13881] New: xxd -p -r fails with input longer than 30 bytes

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13881

            Bug ID: 13881
           Summary: xxd -p -r fails with input longer than 30 bytes
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: hudson at trmm.net
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

version: 21fbee2e87ddf7b47bb501b6529b63ac2b3af0bd (git checkout 2021-06-29)

xxd -p -r discards input longer than 30 bytes when the characters are all on
one line:

% echo "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f" \
| ./busybox xxd -p -r | xxd -g1
00000000: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f  ................
00000010: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d        ..............


% echo "000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f" \
| ./busybox xxd -p -r | xxd -g1
00000000: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f  ................
00000010: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d        ..............

Splitting the values onto separate lines works:

% echo "000102030405060708090a0b0c0d0e0f
101112131415161718191a1b1c1d1e1f" \
| ./busybox xxd -p -r | xxd -g1
00000000: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f  ................
00000010: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f  ................

Using the system xxd produces the expected result regardless of whitespace:

% echo "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f" \
| /usr/bin/xxd -p -r | xxd -g1
00000000: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f  ................
00000010: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f  ................

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