1 files changed, 40 insertions, 21 deletions

diff --git a/src/lib/libc/string/strdup.3 b/src/lib/libc/string/strdup.3
index 925cbf3d46..59b77f7a16 100644
--- a/src/lib/libc/string/strdup.3
+++ b/src/lib/libc/string/strdup.3
@@ -1,5 +1,7 @@
-.\" Copyright (c) 1990, 1991 The Regents of the University of California.
-.\" All rights reserved.
+.\" $OpenBSD: strdup.3,v 1.12 2003/06/02 20:18:38 millert Exp $
+.\"
+.\" Copyright (c) 1990, 1991, 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
@@ -9,11 +11,7 @@
 .\" 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. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"     This product includes software developed by the University of
-.\"     California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
+.\" 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.
 .\"
@@ -29,10 +27,9 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"     from: @(#)strdup.3      5.3 (Berkeley) 4/19/91
-.\"     $Id: strdup.3,v 1.1.1.1 1995/10/18 08:42:22 deraadt Exp $
+.\"     @(#)strdup.3    8.1 (Berkeley) 6/9/93
 .\"
-.Dd April 19, 1991
+.Dd June 9, 1993
 .Dt STRDUP 3
 .Os
 .Sh NAME
@@ -41,25 +38,47 @@
 .Sh SYNOPSIS
 .Fd #include <string.h>
 .Ft char *
-.Fn strdup "const char *str"
+.Fn strdup "const char *s"
 .Sh DESCRIPTION
 The
 .Fn strdup
-function
-allocates sufficient memory for a copy
-of the string
-.Fa str ,
+function allocates sufficient memory for a copy of the string
+.Fa s ,
 does the copy, and returns a pointer to it.
-The pointer may subsequently be used as an
-argument to the function
+The pointer may subsequently be used as an argument to the function
 .Xr free 3 .
+.Pp
+If insufficient memory is available,
+.Dv NULL
+is returned.
+.Sh EXAMPLES
+The following will point
+.Va p
+to an allocated area of memory containing the null-terminated string
+.Qq foobar :
+.Bd -literal -offset indent
+char *p;
+
+if ((p = strdup("foobar")) == NULL) {
+        fprintf(stderr, "Out of memory.\en");
+        exit(1);
+}
+.Ed
+.Sh ERRORS
+The
+.Fn strdup
+function may fail and set the external variable
+.Va errno
+for any of the errors specified for the library function
+.Xr malloc 3 .
 .Sh SEE ALSO
 .Xr free 3 ,
 .Xr malloc 3 ,
-.Xt strcpy 3 ,
-.Xt strlen 3
+.Xr strcpy 3 ,
+.Xr strlcpy 3 ,
+.Xr strlen 3
 .Sh HISTORY
 The
 .Fn strdup
-function
-.Ud .
+function first appeared in
+.Bx 4.4 .