Module Name: src
Committed By: perry
Date: Fri May 1 17:27:01 UTC 2009
Modified Files:
src/lib/libc: shlib_version
src/lib/libc/string: Makefile.inc strcpy.3 string.3 strlen.3 wmemchr.3
Added Files:
src/lib/libc/string: stpcpy.c stpncpy.c strnlen.c
Log Message:
Add versions of stpcpy(3), stpncpy(3), strnlen(3), all from FreeBSD.
These are defined in the latest POSIX
Also make related updates to documentation, mostly from FreeBSD,
though I cleaned a few other things up along the way.
Bump shlib_version.
We are still missing strcoll_l, strerror_l, strsignal, strxfrm_l to be
POSIX conformant.
To generate a diff of this commit:
cvs rdiff -u -r1.210 -r1.211 src/lib/libc/shlib_version
cvs rdiff -u -r1.70 -r1.71 src/lib/libc/string/Makefile.inc
cvs rdiff -u -r0 -r1.1 src/lib/libc/string/stpcpy.c \
src/lib/libc/string/stpncpy.c src/lib/libc/string/strnlen.c
cvs rdiff -u -r1.17 -r1.18 src/lib/libc/string/strcpy.3
cvs rdiff -u -r1.15 -r1.16 src/lib/libc/string/string.3
cvs rdiff -u -r1.8 -r1.9 src/lib/libc/string/strlen.3
cvs rdiff -u -r1.12 -r1.13 src/lib/libc/string/wmemchr.3
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/lib/libc/shlib_version
diff -u src/lib/libc/shlib_version:1.210 src/lib/libc/shlib_version:1.211
--- src/lib/libc/shlib_version:1.210 Sun Apr 12 17:07:16 2009
+++ src/lib/libc/shlib_version Fri May 1 17:27:01 2009
@@ -1,4 +1,4 @@
-# $NetBSD: shlib_version,v 1.210 2009/04/12 17:07:16 christos Exp $
+# $NetBSD: shlib_version,v 1.211 2009/05/01 17:27:01 perry Exp $
# Remember to update distrib/sets/lists/base/shl.* when changing
#
# things we wish to do on next major version bump:
@@ -35,4 +35,4 @@
# it's insufficient bitwidth to implement all ctype class.
# see isblank's comment in ctype.h.
major=12
-minor=166
+minor=167
Index: src/lib/libc/string/Makefile.inc
diff -u src/lib/libc/string/Makefile.inc:1.70 src/lib/libc/string/Makefile.inc:1.71
--- src/lib/libc/string/Makefile.inc:1.70 Fri Apr 10 23:13:38 2009
+++ src/lib/libc/string/Makefile.inc Fri May 1 17:27:01 2009
@@ -1,11 +1,13 @@
# from: @(#)Makefile.inc 8.1 (Berkeley) 6/4/93
-# $NetBSD: Makefile.inc,v 1.70 2009/04/10 23:13:38 christos Exp $
+# $NetBSD: Makefile.inc,v 1.71 2009/05/01 17:27:01 perry Exp $
# string sources
.PATH: ${ARCHDIR}/string ${.CURDIR}/string
-SRCS+= bm.c strcasecmp.c strncasecmp.c strcasestr.c strcoll.c strdup.c \
- strerror.c strlcat.c strlcpy.c strmode.c strsignal.c strtok.c \
+SRCS+= bm.c stpcpy.c stpncpy.c \
+ strcasecmp.c strncasecmp.c strcasestr.c strcoll.c strdup.c \
+ strerror.c strlcat.c strlcpy.c strnlen.c \
+ strmode.c strsignal.c strtok.c \
strtok_r.c strxfrm.c __strsignal.c strerror_r.c strndup.c \
stresep.c memrchr.c
@@ -66,8 +68,9 @@
MLINKS+=strcasecmp.3 strncasecmp.3
MLINKS+=strcat.3 strncat.3
MLINKS+=strcmp.3 strncmp.3
-MLINKS+=strcpy.3 strncpy.3
+MLINKS+=strcpy.3 strncpy.3 strcpy.3 stpcpy.3 strcpy.3 stpncpy.3
MLINKS+=strlcpy.3 strlcat.3
+MLINKS+=strlen.3 strnlen.3
MLINKS+=strstr.3 strcasestr.3
MLINKS+=memchr.3 memrchr.3
MLINKS+=strtok.3 strtok_r.3
Index: src/lib/libc/string/strcpy.3
diff -u src/lib/libc/string/strcpy.3:1.17 src/lib/libc/string/strcpy.3:1.18
--- src/lib/libc/string/strcpy.3:1.17 Mon Oct 16 08:48:45 2006
+++ src/lib/libc/string/strcpy.3 Fri May 1 17:27:01 2009
@@ -30,12 +30,14 @@
.\" SUCH DAMAGE.
.\"
.\" from: @(#)strcpy.3 8.1 (Berkeley) 6/4/93
-.\" $NetBSD: strcpy.3,v 1.17 2006/10/16 08:48:45 wiz Exp $
+.\" $NetBSD: strcpy.3,v 1.18 2009/05/01 17:27:01 perry Exp $
.\"
-.Dd May 6, 2002
+.Dd May 1, 2009
.Dt STRCPY 3
.Os
.Sh NAME
+.Nm stpcpy ,
+.Nm stpncpy ,
.Nm strcpy ,
.Nm strncpy
.Nd copy strings
@@ -44,14 +46,18 @@
.Sh SYNOPSIS
.In string.h
.Ft char *
+.Fn stpcpy "char * restrict dst" "const char * restrict src"
+.Ft char *
+.Fn stpncpy "char * restrict dst" "const char * restrict src" "size_t len"
+.Ft char *
.Fn strcpy "char * restrict dst" "const char * restrict src"
.Ft char *
.Fn strncpy "char * restrict dst" "const char * restrict src" "size_t len"
.Sh DESCRIPTION
The
-.Fn strcpy
+.Fn stpcpy
and
-.Fn strncpy
+.Fn strcpy
functions
copy the string
.Fa src
@@ -62,26 +68,30 @@
character).
.Pp
The
+.Fn stpncpy
+and
.Fn strncpy
-function copies not more than
+functions copy at most
.Fa len
-characters into
-.Fa dst ,
-appending
-.Ql \e0
-characters if
+characters from
+.Fa src
+into
+.Fa dst .
+If
.Fa src
is less than
.Fa len
-characters long, and
-.Em not
-terminating
+characters long,
+the remainder of
+.Fa dst
+is filled with
+.Ql \e0
+characters.
+Otherwise,
.Fa dst
-if
-.Fa src
is
-.Fa len
-or more characters long.
+.Em not
+terminated.
.Sh RETURN VALUES
The
.Fn strcpy
@@ -90,64 +100,105 @@
functions
return
.Fa dst .
+The
+.Fn stpcpy
+and
+.Fn stpncpy
+functions return a pointer to the terminating
+.Ql \e0
+character of
+.Fa dst .
+If
+.Fn stpncpy
+does not terminate
+.Fa dst
+with a
+.Dv NUL
+character, it instead returns a pointer to
+.Li dst[len]
+(which does not necessarily refer to a valid memory location.)
.Sh EXAMPLES
The following sets
-.Dq Li chararray
+.Va chararray
to
-.Dq Li abc\e0\e0\e0 .
+.Dq Li abc\e0\e0\e0 :
.Bd -literal -offset indent
-(void)strncpy(chararray, "abc", 6);
+char chararray[6];
+
+(void)strncpy(chararray, "abc", sizeof(chararray));
.Ed
.Pp
The following sets
-.Dq Li chararray
+.Va chararray
to
-.Dq Li abcdef
-and does
+.Dq Li abcdef :
+.Bd -literal -offset indent
+char chararray[6];
+
+(void)strncpy(chararray, "abcdefgh", sizeof(chararray));
+.Ed
+.Pp
+Note that it does
.Em not
-nul-terminate
+.Tn NUL
+terminate
.Va chararray
-because the source string is \*[Gt]= the length parameter.
+because the length of the source string is greater than or equal
+to the length parameter.
.Fn strncpy
.Em only
-nul-terminates the destination string when the length of the source
+.Tn NUL
+terminates
+the destination string when the length of the source
string is less than the length parameter.
-.Bd -literal -offset indent
-(void)strncpy(chararray, "abcdefgh", 6);
-.Ed
.Pp
The following copies as many characters from
.Va input
to
.Va buf
-as will fit and nul-terminates the result.
+as will fit and
+.Tn NUL
+terminates the result.
Because
.Fn strncpy
does
.Em not
-guarantee to nul-terminate the string itself, we must do this by hand.
+guarantee to
+.Tn NUL
+terminate the string itself, this must be done explicitly.
.Bd -literal -offset indent
-char buf[BUFSIZ];
+char buf[1024];
(void)strncpy(buf, input, sizeof(buf) - 1);
buf[sizeof(buf) - 1] = '\e0';
.Ed
.Pp
-Note that
-.Xr strlcpy 3
-is a better choice for this kind of operation.
-The equivalent using
-.Xr strlcpy 3
-is simply:
+This could be better and more simply achieved using
+.Xr strlcpy 3 ,
+as shown in the following example:
.Bd -literal -offset indent
(void)strlcpy(buf, input, sizeof(buf));
.Ed
+.Pp
+Note that because
+.Xr strlcpy 3
+is not defined in any standards, it should
+only be used when portability is not a concern.
+.Sh SECURITY CONSIDERATIONS
+The
+.Fn strcpy
+and
+.Fn stpcpy
+functions are easily misused in a manner which enables malicious users
+to arbitrarily change a running program's functionality through a
+buffer overflow attack.
.Sh SEE ALSO
.Xr bcopy 3 ,
.Xr memccpy 3 ,
.Xr memcpy 3 ,
.Xr memmove 3 ,
-.Xr strlcpy 3
+.Xr strlcpy 3 ,
+.Xr wcscpy 3
.Sh STANDARDS
The
.Fn strcpy
@@ -156,3 +207,16 @@
functions
conform to
.St -isoC-99 .
+The
+.Fn stpcpy
+and
+.Fn stpncpy
+functions conform to
+.St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn stpcpy
+and
+.Fn stpncpy
+functions first appeared in
+.Nx 6.0 .
Index: src/lib/libc/string/string.3
diff -u src/lib/libc/string/string.3:1.15 src/lib/libc/string/string.3:1.16
--- src/lib/libc/string/string.3:1.15 Sat Feb 17 09:32:58 2007
+++ src/lib/libc/string/string.3 Fri May 1 17:27:01 2009
@@ -28,12 +28,14 @@
.\" SUCH DAMAGE.
.\"
.\" from: @(#)string.3 8.2 (Berkeley) 12/11/93
-.\" $NetBSD: string.3,v 1.15 2007/02/17 09:32:58 wiz Exp $
+.\" $NetBSD: string.3,v 1.16 2009/05/01 17:27:01 perry Exp $
.\"
-.Dd February 17, 2007
+.Dd May 1, 2009
.Dt STRING 3
.Os
.Sh NAME
+.Nm stpcpy ,
+.Nm stpncpy ,
.Nm strcat ,
.Nm strlcat ,
.Nm strncat ,
@@ -41,6 +43,8 @@
.Nm strrchr ,
.Nm strcmp ,
.Nm strncmp ,
+.Nm strcasecmp ,
+.Nm strncasecmp ,
.Nm strcoll ,
.Nm strcpy ,
.Nm strlcpy ,
@@ -48,6 +52,7 @@
.Nm strerror ,
.Nm strerror_r ,
.Nm strlen ,
+.Nm strnlen ,
.Nm strpbrk ,
.Nm strsep ,
.Nm stresep ,
@@ -66,6 +71,10 @@
.Sh SYNOPSIS
.In string.h
.Ft char *
+.Fn stpcpy "char *dst" "const char *src"
+.Ft char *
+.Fn stpncpy "char *dst" "const char *src" "size_t count"
+.Ft char *
.Fn strcat "char *s" "const char * append"
.Ft size_t
.Fn strlcat "char *dst" "const char *src" "size_t size"
@@ -80,6 +89,10 @@
.Ft int
.Fn strncmp "const char *s1" "const char *s2" "size_t count"
.Ft int
+.Fn strcasecmp "const char *s1" "const char *s2"
+.Ft int
+.Fn strncasecmp "const char *s1" "const char *s2" "size_t count"
+.Ft int
.Fn strcoll "const char *s1" "const char *s2"
.Ft char *
.Fn strcpy "char *dst" "const char *src"
@@ -93,6 +106,8 @@
.Fn strerror_r "int errnum" "char *strerrbuf" "size_t buflen"
.Ft size_t
.Fn strlen "const char *s"
+.Ft size_t
+.Fn strnlen "const char *s" "size_t count"
.Ft char *
.Fn strpbrk "const char *s" "const char *charset"
.Ft char *
Index: src/lib/libc/string/strlen.3
diff -u src/lib/libc/string/strlen.3:1.8 src/lib/libc/string/strlen.3:1.9
--- src/lib/libc/string/strlen.3:1.8 Thu Aug 7 16:43:51 2003
+++ src/lib/libc/string/strlen.3 Fri May 1 17:27:01 2009
@@ -30,13 +30,14 @@
.\" SUCH DAMAGE.
.\"
.\" from: @(#)strlen.3 8.1 (Berkeley) 6/4/93
-.\" $NetBSD: strlen.3,v 1.8 2003/08/07 16:43:51 agc Exp $
+.\" $NetBSD: strlen.3,v 1.9 2009/05/01 17:27:01 perry Exp $
.\"
-.Dd June 4, 1993
+.Dd May 1, 2009
.Dt STRLEN 3
.Os
.Sh NAME
-.Nm strlen
+.Nm strlen ,
+.Nm strnlen
.Nd find length of string
.Sh LIBRARY
.Lb libc
@@ -44,12 +45,23 @@
.In string.h
.Ft size_t
.Fn strlen "const char *s"
+.Ft size_t
+.Fn strnlen "const char *s" "size_t maxlen"
.Sh DESCRIPTION
The
.Fn strlen
function
computes the length of the string
.Fa s .
+.Pp
+The
+.Fn strnlen
+function attempts to compute the length of
+.Fa s ,
+but never scans beyond the first
+.Fa maxlen
+bytes of
+.Fa s .
.Sh RETURN VALUES
The
.Fn strlen
@@ -59,11 +71,25 @@
terminating
.Dv NUL
character.
+.Pp
+The
+.Fn strnlen
+function returns either the same result as
+.Fn strlen
+or
+.Fa maxlen ,
+whichever is smaller.
.Sh SEE ALSO
-.Xr string 3
+.Xr string 3 ,
+.Xr wcslen 3 ,
+.Xr wcswidth 3
.Sh STANDARDS
The
.Fn strlen
function
conforms to
-.St -ansiC .
+.St -isoC .
+The
+.Fn strnlen
+function conforms to
+.St -p1003.1-2008 .
Index: src/lib/libc/string/wmemchr.3
diff -u src/lib/libc/string/wmemchr.3:1.12 src/lib/libc/string/wmemchr.3:1.13
--- src/lib/libc/string/wmemchr.3:1.12 Sat Oct 14 07:52:15 2006
+++ src/lib/libc/string/wmemchr.3 Fri May 1 17:27:01 2009
@@ -1,4 +1,4 @@
-.\" $NetBSD: wmemchr.3,v 1.12 2006/10/14 07:52:15 wiz Exp $
+.\" $NetBSD: wmemchr.3,v 1.13 2009/05/01 17:27:01 perry Exp $
.\"
.\" Copyright (c) 1990, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@@ -33,7 +33,7 @@
.\"
.\" from: @(#)strcpy.3 8.1 (Berkeley) 6/4/93
.\"
-.Dd October 13, 2006
+.Dd May 1, 2009
.Dt WMEMCHR 3
.Os
.Sh NAME
@@ -126,17 +126,23 @@
.Xr memcpy 3 ,
.Xr memmove 3 ,
.Xr memset 3 ,
+.Xr stpcpy 3 ,
+.Xr stpncpy 3 ,
+.Xr strcasecmp 3 ,
.Xr strcat 3 ,
.Xr strchr 3 ,
.Xr strcmp 3 ,
.Xr strcpy 3 ,
.Xr strcspn 3 ,
+.Xr strdup 3 ,
.Xr strlcat 3 ,
.Xr strlcpy 3 ,
.Xr strlen 3 ,
+.Xr strnlen 3 ,
.Xr strncat 3 ,
.Xr strncmp 3 ,
.Xr strncpy 3 ,
+.Xr strnlen 3 ,
.Xr strpbrk 3 ,
.Xr strrchr 3 ,
.Xr strspn 3 ,
Added files:
Index: src/lib/libc/string/stpcpy.c
diff -u /dev/null src/lib/libc/string/stpcpy.c:1.1
--- /dev/null Fri May 1 17:27:01 2009
+++ src/lib/libc/string/stpcpy.c Fri May 1 17:27:01 2009
@@ -0,0 +1,52 @@
+/* $NetBSD: stpcpy.c,v 1.1 2009/05/01 17:27:01 perry Exp $ */
+
+/*
+ * Copyright (c) 1999
+ * David E. O'Brien
+ * Copyright (c) 1988, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)strcpy.c 8.1 (Berkeley) 6/4/93";
+#else
+__RCSID("$NetBSD: stpcpy.c,v 1.1 2009/05/01 17:27:01 perry Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+/* FreeBSD: src/lib/libc/string/stpcpy.c,v 1.2 2009/02/28 06:05:37 das Exp */
+
+#include <string.h>
+
+char *
+stpcpy(char * __restrict to, const char * __restrict from)
+{
+
+ for (; (*to = *from); ++from, ++to);
+ return(to);
+}
Index: src/lib/libc/string/stpncpy.c
diff -u /dev/null src/lib/libc/string/stpncpy.c:1.1
--- /dev/null Fri May 1 17:27:01 2009
+++ src/lib/libc/string/stpncpy.c Fri May 1 17:27:01 2009
@@ -0,0 +1,50 @@
+/* $NetBSD: stpncpy.c,v 1.1 2009/05/01 17:27:01 perry Exp $ */
+
+/*-
+ * Copyright (c) 2009 David Schultz <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: stpncpy.c,v 1.1 2009/05/01 17:27:01 perry Exp $");
+#endif /* LIBC_SCCS and not lint */
+/* FreeBSD: src/lib/libc/string/stpncpy.c,v 1.1 2009/02/28 06:00:58 das Exp */
+
+#include <string.h>
+
+char *
+stpncpy(char * __restrict dst, const char * __restrict src, size_t n)
+{
+
+ for (; n--; dst++, src++) {
+ if (!(*dst = *src)) {
+ char *ret = dst;
+ while (n--)
+ *++dst = '\0';
+ return (ret);
+ }
+ }
+ return (dst);
+}
Index: src/lib/libc/string/strnlen.c
diff -u /dev/null src/lib/libc/string/strnlen.c:1.1
--- /dev/null Fri May 1 17:27:01 2009
+++ src/lib/libc/string/strnlen.c Fri May 1 17:27:01 2009
@@ -0,0 +1,47 @@
+/* $NetBSD: strnlen.c,v 1.1 2009/05/01 17:27:01 perry Exp $ */
+
+/*-
+ * Copyright (c) 2009 David Schultz <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: strnlen.c,v 1.1 2009/05/01 17:27:01 perry Exp $");
+#endif /* LIBC_SCCS and not lint */
+/* FreeBSD: src/lib/libc/string/strnlen.c,v 1.1 2009/02/28 06:00:58 das Exp */
+
+#include <string.h>
+
+size_t
+strnlen(const char *s, size_t maxlen)
+{
+ size_t len;
+
+ for (len = 0; len < maxlen; len++, s++) {
+ if (!*s)
+ break;
+ }
+ return (len);
+}
