[bug-gnu-libiconv] iconv should be able to handle input files that are also output files

[David D Lowe]

The following command is buggy:

iconv -f cp1251 -t utf8 filename -o filename

iconv does not recognise when the input file and the destination files are the same, writing to the file before it can read it all in. There are workarounds for this, but IMO iconv should behave in a safe manner when the filenames are identical.