3 files changed, 53 insertions, 3 deletions

diff --git a/src/lib/libc/string/Makefile.inc b/src/lib/libc/string/Makefile.inc
index e7b81d0c43..3cd172287b 100644
--- a/src/lib/libc/string/Makefile.inc
+++ b/src/lib/libc/string/Makefile.inc
@@ -1,10 +1,10 @@
-#       $OpenBSD: Makefile.inc,v 1.10 2001/09/05 16:27:01 mickey Exp $
+#       $OpenBSD: Makefile.inc,v 1.11 2002/11/21 20:45:05 marc Exp $
 
 # string sources
 .PATH: ${LIBCSRCDIR}/arch/${MACHINE_ARCH}/string ${LIBCSRCDIR}/string
 
 SRCS+=  bm.c memccpy.c strcasecmp.c strcoll.c strdup.c strerror.c \
-        strlcat.c strmode.c strsignal.c strtok.c strxfrm.c \
+        strerror_r.c strlcat.c strmode.c strsignal.c strtok.c strxfrm.c \
         __strerror.c __strsignal.c
 
 # machine-dependent net sources
diff --git a/src/lib/libc/string/strerror.3 b/src/lib/libc/string/strerror.3
index 11bacd313e..05cb7e9d9c 100644
--- a/src/lib/libc/string/strerror.3
+++ b/src/lib/libc/string/strerror.3
@@ -33,7 +33,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"     $OpenBSD: strerror.3,v 1.4 2000/10/23 19:14:41 aaron Exp $
+.\"     $OpenBSD: strerror.3,v 1.5 2002/11/21 20:45:05 marc Exp $
 .\"
 .Dd June 29, 1991
 .Dt STRERROR 3
@@ -45,6 +45,8 @@
 .Fd #include <string.h>
 .Ft char *
 .Fn strerror "int errnum"
+.Ft int
+.Fn strerror_r "int errnum" "char *strerrbuf" "size_t buflen"
 .Sh DESCRIPTION
 The
 .Fn strerror
@@ -58,6 +60,20 @@ characters, including the trailing NUL.
 The array pointed to is not to be modified by the program, but may be
 overwritten by subsequent calls to
 .Fn strerror .
+.Pp
+.Fn strerror_r
+is a thread safe version of
+.Fn strerror
+that places the error message in the given buffer
+.Fa strerrbuf .
+If the error message is larger then
+.Fa buflen
+the message will be truncated to fit within buflen and
+.Er ERANGE
+is returned.
+.Fn strerror_r
+returns zero upon successful completion.
+An error number is returned, otherwise.
 .Sh SEE ALSO
 .Xr intro 2 ,
 .Xr perror 3 ,
@@ -67,3 +83,7 @@ The
 .Fn strerror
 function conforms to
 .St -ansiC .
+The
+.Fn strerror_r
+function conforms to
+.St -p1003.1 .
diff --git a/src/lib/libc/string/strerror_r.c b/src/lib/libc/string/strerror_r.c
new file mode 100644
index 0000000000..aab6db5303
--- /dev/null
+++ b/src/lib/libc/string/strerror_r.c
@@ -0,0 +1,30 @@
+/* $OpenBSD: strerror_r.c,v 1.1 2002/11/21 20:45:05 marc Exp $ */
+/* Public Domain <marc@snafu.org> */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char *rcsid = "$OpenBSD: strerror_r.c,v 1.1 2002/11/21 20:45:05 marc Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <errno.h>
+#include <limits.h>
+#include <string.h>
+
+extern char *__strerror(int, char *);
+
+int
+strerror_r(int errnum, char *strerrbuf, size_t buflen)
+{
+        int save_errno;
+        int ret_errno;
+        char buf[NL_TEXTMAX];
+
+        save_errno = errno;
+        errno = 0;
+        __strerror(errnum, buf);
+        if (strlcpy(strerrbuf, buf, buflen) >= buflen)
+                errno = ERANGE;
+        ret_errno = errno;
+        errno = save_errno;
+
+        return (ret_errno);
+}