Sprinkle <sys/featuretest.h> where _*_SOURCE macros are consulted.

Otherwise, the feature tests might come out wrong. For example,
header files that check for _NETBSD_SOURCE won't get the default w

Sprinkle <sys/featuretest.h> where _*_SOURCE macros are consulted.

Otherwise, the feature tests might come out wrong. For example,
header files that check for _NETBSD_SOURCE won't get the default when
no other _*_SOURCE macros are defined; header files that check for
_POSIX_C_SOURCE might miss _XOPEN_SOURCE, which is supposed to imply
a corresponding _POSIX_C_SOURCE.

PR lib/58752: various header files test _*_SOURCE macros but don't
include sys/featuretest.h

show more ...

- Replace REG_ENOSYS (unused) with REG_ILLSEQ.
- Add REG_GNU

rename to regnsub

add reg{,a}sub

compat code reorg

de-__P -- the hack is long since useless. Discussed with christos,
matt, kleink, others. Approved by christos.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22270, verified by myself.

Sprinkle some restrict.

Uhm - we can't expose __LIBC12_SOURCE__ to the public - it causes side
effects in the function renaming mess.

regoff_t is used like size_t within the code, it should be defined
so instead of off_t. This makes some casts unnecessary.
We can't change the definition now due to binary compatibility, so
prepare f

regoff_t is used like size_t within the code, it should be defined
so instead of off_t. This makes some casts unnecessary.
We can't change the definition now due to binary compatibility, so
prepare for the next libc major version.

show more ...

For completeness, add REG_ENOSYS.

merge lite-2

Include <sys/types.h>

POSIX.2 requires programs to include <sys/types.h> before including
<regex.h>. XPG4.2 makes <sys/types.h> optional for all headers.

new RCS ID format.

update from latest regex package i could find...

Update to Henry's alpha3.2 release.

Enable Henry Spencer's POSIX.2 compatible regular expression routines.
Disable is earlier V8-style routines.