add examples

src/lib/libc/string/strchr.3

@@ -33,14 +33,14 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$OpenBSD: strchr.3,v 1.3 1997/12/29 22:31:50 deraadt Exp $
+.\"	$OpenBSD: strchr.3,v 1.4 1999/06/04 17:26:26 aaron Exp $
 .\"
 .Dd June 29, 1991
 .Dt STRCHR 3
 .Os
 .Sh NAME
 .Nm strchr
-.Nd locate character in string
+.Nd locate first occurence of a character in a string
 .Sh SYNOPSIS
 .Fd #include <string.h>
 .Ft char *
@@ -48,13 +48,11 @@
 .Sh DESCRIPTION
 The
 .Fn strchr
-function locates the first occurrence of
-.Ar c
-in the string pointed to by
-.Ar s .
-The terminating
-.Dv NUL
-character is considered part of the string.
+function locates the first occurrence of the character
+.Fa c
+in the string
+.Fa s .
+The terminating NUL character is considered part of the string.
 If
 .Fa c
 is
@@ -63,11 +61,23 @@ is
 locates the terminating
 .Ql \e0 .
 .Sh RETURN VALUES
-The function
+The
 .Fn strchr
-returns a pointer to the located character, or
+function returns a pointer to the located character or
 .Dv NULL
 if the character does not appear in the string.
+.Sh EXAMPLES
+After the following call to
+.Fn strchr ,
+.Va p
+will point to the string
+.Qq oobar :
+.Bd -literal -offset indent
+char *p;
+char *s = "foobar";
+
+p = strchr(s, 'o');
+.Ed
 .Sh SEE ALSO
 .Xr index 3 ,
 .Xr memchr 3 ,

src/lib/libc/string/strrchr.3

@@ -33,14 +33,14 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$OpenBSD: strrchr.3,v 1.2 1996/08/19 08:34:23 tholo Exp $
+.\"	$OpenBSD: strrchr.3,v 1.3 1999/06/04 17:26:27 aaron Exp $
 .\"
 .Dd June 29, 1991
 .Dt STRRCHR 3
 .Os
 .Sh NAME
 .Nm strrchr
-.Nd locate character in string
+.Nd locate last occurence of a character in a string
 .Sh SYNOPSIS
 .Fd #include <string.h>
 .Ft char *
@@ -48,12 +48,11 @@
 .Sh DESCRIPTION
 The
 .Fn strrchr
-function
-locates the last occurrence of
+function locates the last occurrence of the character
 .Fa c
-(converted to a char)
 in the string
 .Fa s .
+The terminating NUL character is considered part of the string.
 If
 .Fa c
 is
@@ -64,13 +63,21 @@ locates the terminating
 .Sh RETURN VALUES
 The
 .Fn strrchr
-function
-returns a pointer to the character,
-or a null
-pointer if
-.Fa c
-does not occur anywhere in
-.Fa s .
+function returns a pointer to the located character or
+.Dv NULL
+if the character does not appear in the string.
+.Sh EXAMPLES
+After the following call to
+.Fn strrchr ,
+.Va p
+will point to the string
+.Qq obar :
+.Bd -literal -offset indent
+char *p;
+char *s = "foobar";
+
+p = strrchr(s, 'o');
+.Ed
 .Sh SEE ALSO
 .Xr index 3 ,
 .Xr memchr 3 ,