The branch main has been updated by wulf:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=bc861033357ef2d2eeaf5d85d70bb4b638961b2d

commit bc861033357ef2d2eeaf5d85d70bb4b638961b2d
Author:     Vladimir Kondratyev <w...@freebsd.org>
AuthorDate: 2020-10-06 14:50:52 +0000
Commit:     Vladimir Kondratyev <w...@freebsd.org>
CommitDate: 2021-01-07 23:18:42 +0000

    libkern/strcasestr.c: Drop xlocale support and connect to build.
    
    Reviewed by:    markj, hselasky
    Differential revision:  https://reviews.freebsd.org/D27866
---
 sys/conf/files           |  1 +
 sys/libkern/strcasestr.c | 22 ++++++++--------------
 sys/sys/libkern.h        |  1 +
 3 files changed, 10 insertions(+), 14 deletions(-)

diff --git a/sys/conf/files b/sys/conf/files
index 0258fca24836..7cfb32560af6 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -4058,6 +4058,7 @@ libkern/qsort_r.c         standard
 libkern/random.c               standard
 libkern/scanc.c                        standard
 libkern/strcasecmp.c           standard
+libkern/strcasestr.c           standard
 libkern/strcat.c               standard
 libkern/strchr.c               standard
 libkern/strchrnul.c            optional gdb
diff --git a/sys/libkern/strcasestr.c b/sys/libkern/strcasestr.c
index b70c2195a94e..c0418cfaeb3d 100644
--- a/sys/libkern/strcasestr.c
+++ b/sys/libkern/strcasestr.c
@@ -40,35 +40,29 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include <ctype.h>
-#include <string.h>
-#include "xlocale_private.h"
+#include <sys/param.h>
+#include <sys/ctype.h>
+#include <sys/libkern.h>
 
 /*
  * Find the first occurrence of find in s, ignore case.
  */
 char *
-strcasestr_l(const char *s, const char *find, locale_t locale)
+strcasestr(const char *s, const char *find)
 {
        char c, sc;
        size_t len;
-       FIX_LOCALE(locale);
 
        if ((c = *find++) != 0) {
-               c = tolower_l((unsigned char)c, locale);
+               c = tolower((unsigned char)c);
                len = strlen(find);
                do {
                        do {
                                if ((sc = *s++) == 0)
                                        return (NULL);
-                       } while ((char)tolower_l((unsigned char)sc, locale) != 
c);
-               } while (strncasecmp_l(s, find, len, locale) != 0);
+                       } while ((char)tolower((unsigned char)sc) != c);
+               } while (strncasecmp(s, find, len) != 0);
                s--;
        }
-       return ((char *)s);
-}
-char *
-strcasestr(const char *s, const char *find)
-{
-       return strcasestr_l(s, find, __get_locale());
+       return (__DECONST(char *, s));
 }
diff --git a/sys/sys/libkern.h b/sys/sys/libkern.h
index 7385df139297..3874ef9ec4bd 100644
--- a/sys/sys/libkern.h
+++ b/sys/sys/libkern.h
@@ -168,6 +168,7 @@ void         qsort_r(void *base, size_t nmemb, size_t size, 
void *thunk,
 u_long  random(void);
 int     scanc(u_int, const u_char *, const u_char *, int);
 int     strcasecmp(const char *, const char *);
+char   *strcasestr(const char *, const char *);
 char   *strcat(char * __restrict, const char * __restrict);
 char   *strchr(const char *, int);
 char   *strchrnul(const char *, int);
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