On Sun, Jun 05, 2022 at 14:42:55 -0500, Oskari Pirhonen wrote: > On Sat, Jun 04, 2022 at 16:46:33 -0400, Ionen Wolkens wrote: > > +# Where possible, it is also good to consider if using patches is more > > +# suitable to ensure adequate changes. These functions are also unsafe > > +# for binary files containing null bytes (erepl() will remove them). > > Some way to test for NULL in the file before reading might be useful. > Possibly die if found? Although right now I can't think of a super > elegant and/or efficient way to do so without writing a simple external > helper. >
I came up with _an_ idea. It feels kinda hacky, goes against my previous
statement wrt running sed on binary files, but it seems to work based on
some quick tests:
[ /tmp ]
oskari@dj3ntoo λ null_free() {
> [[ $(sed -ne '/\x00/{p;q}' "$1" | wc -c) -eq 0 ]]
> }
[ /tmp ]
oskari@dj3ntoo λ for f in test*.dat; do
> echo "${f}:"
> hd $f
> null_free $f || echo "has null"
> done
test1.dat:
00000000 61 62 0a 63 64 00 65 66 |ab.cd.ef|
00000008
has null
test2.dat:
00000000 67 68 0a 69 6a 0a 6b 6c |gh.ij.kl|
00000008
test3.dat:
00000000 00 0a 31 32 0a 33 34 |..12.34|
00000007
has null
test4.dat:
00000000 61 61 00 61 61 0a 62 62 00 62 62 0a 63 63 00 63
|aa.aa.bb.bb.cc.c|
00000010 63 |c|
00000011
has null
- Oskari
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