[PATCH v3] memmem.3: Add list of known systems where this is available

[Andrew Clayton <andrew@digital-domain.net>]

While looking at which systems provide memmem(3) I have been able to
discern the following:

  musl libc since v0.9.7 (2012)
  bionic since Android 9 (2018)

  FreeBSD since 6.0 (2005)
  OpenBSD since 5.4 (2013)
  NetBSD
  macOS
  Illumos

For macOS and Illumos I checked the memmem(3) man page on those systems.
For the rest there are links below to on-line man pages or commit logs.

Where I could determine what version memmem(3) was introduced, I've
noted that in the man page.

Link: <http://git.musl-libc.org/cgit/musl/commit/src/string/memmem.c?id=c86f2974e2acd330be2d587173dd4dd56db82e22>
Link: <https://android.googlesource.com/platform/bionic/+/android-9.0.0_r3/libc/bionic/memmem.cpp>
Link: <https://www.freebsd.org/cgi/man.cgi?query=memmem&sektion=3&format=html>
Link: <https://man.openbsd.org/memmem.3>
Link: <https://anonhg.netbsd.org/src/diff/96a37d536271/common/lib/libc/string/memmem.c>
Suggested-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
---

 v3:
  - Split the platform list on ':' and ';'

 v2:
  - Remove references to bionic and macOS from the man page
  - Convert & to and
  - Use Oxford comma
  - Add dates where known to the commit message
  - Use present tense for the subject line

 man3/memmem.3 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/man3/memmem.3 b/man3/memmem.3
index 134dffab0..4a4a885fc 100644
--- a/man3/memmem.3
+++ b/man3/memmem.3
@@ -58,7 +58,10 @@ T}	Thread safety	MT-Safe
 .sp 1
 .SH STANDARDS
 This function is not specified in POSIX.1,
-but is present on a number of other systems.
+but is present on a number of other systems,
+including:
+musl libc 0.9.7;
+FreeBSD 6.0, OpenBSD 5.4, NetBSD, and Illumos.
 .SH BUGS
 .\" This function was broken in Linux libraries up to and including libc 5.0.9;
 .\" there the
-- 
2.38.1