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Refer to the ASCII character 000 by its proper name, `NUL', and not

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`NULL' (which should only be used in reference to null pointers).  Also
fix a cross-reference.
This commit is contained in:
Garrett Wollman 1996-07-25 18:31:08 +00:00
parent 7f7e1b67ff
commit 94b2b83ad5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=17286
1 changed files with 12 additions and 11 deletions
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23
lib/libc/gen/vis.3
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@ -29,9 +29,10 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)vis.3 8.1 (Berkeley) 6/9/93
.\" From: @(#)vis.3 8.1 (Berkeley) 6/9/93
.\" $Id$
.\"
.Dd June 9, 1993
.Dd July 25, 1996
.Dt VIS 3
.Os
.Sh NAME
@ -59,11 +60,11 @@ needs no encoding, it is copied in unaltered. The string is
null terminated, and a pointer to the end of the string is
returned. The maximum length of any encoding is four
characters (not including the trailing
.Dv NULL ) ;
.Dv NUL ) ;
thus, when
encoding a set of characters into a buffer, the size of the buffer should
be four times the number of characters encoded, plus one for the trailing
.Dv NULL .
.Dv NUL .
The flag parameter is used for altering the default range of
characters considered for encoding and for altering the visual
representation.
@ -88,7 +89,7 @@ function encodes characters from
.Fa src
up to the
first
.Dv NULL .
.Dv NUL .
The
.Fn strvisx
function encodes exactly
@ -97,9 +98,9 @@ characters from
.Fa src
(this
is useful for encoding a block of data that may contain
.Dv NULL Ns 's).
.Dv NUL Ns 's).
Both forms
.Dv NULL
.Dv NUL
terminate
.Fa dst .
The size of
@ -108,11 +109,11 @@ must be four times the number
of characters encoded from
.Fa src
(plus one for the
.Dv NULL ) .
.Dv NUL ) .
Both
forms return the number of characters in dst (not including
the trailing
.Dv NULL ) .
.Dv NUL ) .
.Pp
The encoding is a unique, invertible representation comprised entirely of
graphic characters; it can be decoded back into the original form using
@ -226,7 +227,7 @@ The following sequences are used to represent the indicated characters:
.Pp
When using this format, the nextc parameter is looked at to determine
if a
.Dv NULL
.Dv NUL
character can be encoded as
.Ql \e0
instead of
@ -256,8 +257,8 @@ With this flag set, the encoding is
ambiguous and non-invertible.
.Sh SEE ALSO
.Xr unvis 1 ,
.Xr strunvis 3 ,
.Xr unvis 3
.Xr strunvis 3
.Sh HISTORY
These functions first appeared in 4.4BSD.