Use strnstr implementation from FreeBSD if not provided by OS

(cherry picked from commit 5f07fe8cbb)

config.h.in

@@ -429,6 +429,9 @@
 /* Define to 1 if you have the `strlcpy' function. */
 #undef HAVE_STRLCPY
 
+/* Define to 1 if you have the `strnstr' function. */
+#undef HAVE_STRNSTR
+
 /* Define to 1 if you have the `sysconf' function. */
 #undef HAVE_SYSCONF
 

configure

@@ -19633,7 +19633,7 @@ fi
 #
 # Check for some other useful functions that are not ever-present.
 #
-for ac_func in strlcpy strlcat
+for ac_func in strlcpy strlcat strnstr
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"

configure.ac

@@ -1701,7 +1701,7 @@ AS_IF([test "$enable_tcp_fastopen" = "yes"],
 #
 # Check for some other useful functions that are not ever-present.
 #
-AC_CHECK_FUNCS([strlcpy strlcat])
+AC_CHECK_FUNCS([strlcpy strlcat strnstr])
 
 AC_SUBST(READLINE_LIB)
 

lib/isc/include/isc/string.h

@@ -32,6 +32,11 @@ size_t
 strlcat(char *dst, const char *src, size_t size);
 #endif /* if !defined(HAVE_STRLCAT) */
 
+#if !defined(HAVE_STRNSTR)
+char *
+strnstr(const char *s, const char *find, size_t slen);
+#endif /* if !defined(HAVE_STRNSTR) */
+
 int
 isc_string_strerror_r(int errnum, char *buf, size_t buflen);
 

lib/isc/string.c

@@ -12,9 +12,15 @@
  */
 
 /*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -48,6 +54,7 @@
 #include <string.h>
 
 #include <isc/string.h> /* IWYU pragma: keep */
+#include <isc/util.h>
 
 #if !defined(HAVE_STRLCPY)
 size_t
@@ -109,6 +116,29 @@ strlcat(char *dst, const char *src, size_t size) {
 }
 #endif /* !defined(HAVE_STRLCAT) */
 
+#if !defined(HAVE_STRNSTR)
+char *
+strnstr(const char *s, const char *find, size_t slen) {
+	char c, sc, *r;
+	size_t len;
+
+	if ((c = *find++) != '\0') {
+		len = strlen(find);
+		do {
+			do {
+				if (slen-- < 1 || (sc = *s++) == '\0')
+					return (NULL);
+			} while (sc != c);
+			if (len > slen)
+				return (NULL);
+		} while (strncmp(s, find, len) != 0);
+		s--;
+	}
+	DE_CONST(s, r);
+	return (r);
+}
+#endif
+
 int
 isc_string_strerror_r(int errnum, char *buf, size_t buflen) {
 #if defined(_WIN32) || defined(_WIN64)

lib/isc/win32/libisc.def.in

@@ -778,6 +778,7 @@ pkcs_C_VerifyUpdate
 @END PKCS11
 strlcat
 strlcpy
+strnstr
 syslog
 
 @IF NOLONGER