"The routines memccpy, memchr, memcmp, memcpy, memset, strchr, strcspn,
strpbrk, strrchr, strspn, and strtok have been added for compatibility
with System V."
Bug Fixes and Changes in 4.3BSD, SMM
https://bitsavers.org/pdf/usenix/Usenix_BSD_Manuals/4.3_1st_printing_198611/

https://www.tuhs.org/cgi-bin/utree.pl?file=4.3BSD/usr/src/lib/libc/compat-sys5

Index: lib/libc/string/memccpy.3
===================================================================
RCS file: /cvs/src/lib/libc/string/memccpy.3,v
diff -u -p -r1.13 memccpy.3
--- lib/libc/string/memccpy.3	11 Sep 2022 06:38:11 -0000	1.13
+++ lib/libc/string/memccpy.3	11 Dec 2024 01:49:57 -0000
@@ -78,4 +78,4 @@ The
 function first appeared in
 .At V
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/memchr.3
===================================================================
RCS file: /cvs/src/lib/libc/string/memchr.3,v
diff -u -p -r1.13 memchr.3
--- lib/libc/string/memchr.3	11 Sep 2022 06:38:11 -0000	1.13
+++ lib/libc/string/memchr.3	11 Dec 2024 01:51:16 -0000
@@ -99,4 +99,4 @@ The
 function first appeared in
 .At V
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/memcmp.3
===================================================================
RCS file: /cvs/src/lib/libc/string/memcmp.3,v
diff -u -p -r1.10 memcmp.3
--- lib/libc/string/memcmp.3	11 Sep 2022 06:38:11 -0000	1.10
+++ lib/libc/string/memcmp.3	11 Dec 2024 01:51:45 -0000
@@ -83,4 +83,4 @@ The
 function first appeared in
 .At V
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/memcpy.3
===================================================================
RCS file: /cvs/src/lib/libc/string/memcpy.3,v
diff -u -p -r1.10 memcpy.3
--- lib/libc/string/memcpy.3	5 Jun 2013 03:39:23 -0000	1.10
+++ lib/libc/string/memcpy.3	11 Dec 2024 01:52:12 -0000
@@ -76,4 +76,4 @@ The
 function first appeared in
 .At V
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/memset.3
===================================================================
RCS file: /cvs/src/lib/libc/string/memset.3,v
diff -u -p -r1.9 memset.3
--- lib/libc/string/memset.3	11 Sep 2022 06:38:11 -0000	1.9
+++ lib/libc/string/memset.3	11 Dec 2024 01:52:41 -0000
@@ -72,4 +72,4 @@ The
 function first appeared in
 .At V
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/strchr.3
===================================================================
RCS file: /cvs/src/lib/libc/string/strchr.3,v
diff -u -p -r1.13 strchr.3
--- lib/libc/string/strchr.3	1 Oct 2018 06:37:37 -0000	1.13
+++ lib/libc/string/strchr.3	11 Dec 2024 01:53:10 -0000
@@ -113,4 +113,4 @@ The
 function first appeared in
 .At III
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/strcspn.3
===================================================================
RCS file: /cvs/src/lib/libc/string/strcspn.3,v
diff -u -p -r1.11 strcspn.3
--- lib/libc/string/strcspn.3	5 Jun 2013 03:39:23 -0000	1.11
+++ lib/libc/string/strcspn.3	11 Dec 2024 01:53:27 -0000
@@ -105,4 +105,4 @@ The
 function first appeared in
 .At III
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/strpbrk.3
===================================================================
RCS file: /cvs/src/lib/libc/string/strpbrk.3,v
diff -u -p -r1.10 strpbrk.3
--- lib/libc/string/strpbrk.3	5 Jun 2013 03:39:23 -0000	1.10
+++ lib/libc/string/strpbrk.3	11 Dec 2024 01:53:47 -0000
@@ -77,4 +77,4 @@ The
 function first appeared in
 .At III
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/strrchr.3
===================================================================
RCS file: /cvs/src/lib/libc/string/strrchr.3,v
diff -u -p -r1.12 strrchr.3
--- lib/libc/string/strrchr.3	1 Oct 2018 06:37:37 -0000	1.12
+++ lib/libc/string/strrchr.3	11 Dec 2024 01:54:09 -0000
@@ -115,4 +115,4 @@ The
 function first appeared in
 .At III
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/strspn.3
===================================================================
RCS file: /cvs/src/lib/libc/string/strspn.3,v
diff -u -p -r1.11 strspn.3
--- lib/libc/string/strspn.3	5 Jun 2013 03:39:23 -0000	1.11
+++ lib/libc/string/strspn.3	11 Dec 2024 01:54:29 -0000
@@ -89,4 +89,4 @@ The
 function first appeared in
 .At III
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
Index: lib/libc/string/strtok.3
===================================================================
RCS file: /cvs/src/lib/libc/string/strtok.3,v
diff -u -p -r1.23 strtok.3
--- lib/libc/string/strtok.3	2 Sep 2017 13:56:44 -0000	1.23
+++ lib/libc/string/strtok.3	11 Dec 2024 01:54:52 -0000
@@ -149,7 +149,7 @@ The
 function first appeared in
 .At III
 and was reimplemented for
-.Bx 4.3 Tahoe .
+.Bx 4.3 .
 The
 .Fn strtok_r
 function first appeared in