grep: Add missing unistd.h and limits.h includes

Both binary.c and file.c currently pull in unistd.h via zlib's zconf.h.
binary.c uses SEEK_SET and file.c a bunch of things like close(), isatty(),
l

grep: Add missing unistd.h and limits.h includes

Both binary.c and file.c currently pull in unistd.h via zlib's zconf.h.
binary.c uses SEEK_SET and file.c a bunch of things like close(), isatty(),
lseek(). In addition file.c needs limits.h for PATH_MAX.

ok deraadt

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zlib functions take a gzFile not gzFile * (gzFile is already a pointer).
From Josh Rickmar.

simple prototype repairs

Switch binary file detection from !(isprint() || isspace()) to checking
for embedded NULs. Matches GNU and FreeBSD grep, and avoids problems with
e.g. latin1-encoded files being treated as binary in

Switch binary file detection from !(isprint() || isspace()) to checking
for embedded NULs. Matches GNU and FreeBSD grep, and avoids problems with
e.g. latin1-encoded files being treated as binary in the UTF-8 locale once
grep calls setlocale() (which it does not, yet).
OK millert@ tedu@

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Do not include mmap support with -DSMALL.

ok millert

- use size_t where appropriate.
- check for <= 0 in gzread; it returns -1 on error.
From christos@netbsd; ok millert@

Due to a braindead zlib, the test for seekability of a gzstream using
gzseek(f, 0L, SEEK_CUR) does not work as expected. Instead test the
underlying stream and remember that. This repairs echo foo |

Due to a braindead zlib, the test for seekability of a gzstream using
gzseek(f, 0L, SEEK_CUR) does not work as expected. Instead test the
underlying stream and remember that. This repairs echo foo | gzip | zgrep foo.
Problem spotted by Han Boetes in PR 4089; ok millert@

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cast offset value correctly for gzseek

Don't fseek() on stdin if it is a terminal. It does not fail, but
what's more more important, it does not work either.

ok millert@ tedu@

Treat ^H as non-binary. OK hshoexer@, brad@ and deraadt@

fix zgrep failure when the uncompressed file begins with a newline
also, search from the beginning if a stream or compressed file is
identified as 'binary'.
ok millert@, reported by tedu@, tested by

fix zgrep failure when the uncompressed file begins with a newline
also, search from the beginning if a stream or compressed file is
identified as 'binary'.
ok millert@, reported by tedu@, tested by jose@

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make this test look for spaces as well, to match other cases
ok fgs@ ok deraadt@

extend ascii test for more accuracy. ok deraadt@ pb@

o remove useless cast to int from gzread() call
o maxPatternLen should be size_t since that's what it is compared against
o remove useless casts of NULL to various pointer types

backwards args to gzseek

better detetection/handling of binary files.
make -a do the right thing, doc and implement -U, -I.
add --help and --mmap for compatibility.
some other minor fixes.

some from NetBSD. ok deraadt@

proper $OpenBSD$

-DNOZ flag to be used by install media for removing z*grep support, if
needed. (and knf)

correct fseek() parameters

freegrep 0.16