these problems:
1) gzip -vt just prints the contents of a .Z file
2) gzip -vt will print OK even if the .gz file is corrupt
3) gzip -vt prints nothing with a .bz2 file
4) gzip can loop endlessly with a corrupt .bz2 file
all the install media used the 'SMALL' variant, but this is not the case.
Redo the percentage print code to reduce the size to less than the old version.
Fix another fd leakage (didn't call fclose() if ferror() returned non-zero.
Change some maybe_warn() to maybe_warnx() in places I'm sure errno is undefined.
Call mayber_warn() earlier in other paths so that errno might still be valid.
Make the SMALL and NO_BZIP/COMPRESS_SUPPORT options all compile with WARNS=3.
- fix any decompression on corrupted gzip files. PR#25508
- ask to overwrite files if we have a tty, rather than failing the
operation. PR#25509.
- clean up maybe_err()/maybe_warn(): use maybe_err() only for fatal
errors. maybe_warn() is for processing errors. this allows
"gzip -d file1.gz file2.gz" to decompress file2.gz even if file1.gz
is corrupted, etc.
- change the internal compressor/decompressor API to return "-1" on
failure, not 0. this allows for 0-sized files to be decompressed
correctly.
anymore, use the low-level inflate()/deflate() directly. this
allows support file-type detection on stdin; now can decompress
.Z and .bz2 files fed to stdin (fixes PR#25192) additionally it
makes -v work with stdin or stdout (fixes PR#25215.)
(with these changes, we no longer need gzopenfull(3) in libz.)
thanks to martin@ for the code gzip.c:gz_uncompress() is based on.
mrg