NetBSD/lib/libc/gen/stringlist.3

.\"	$NetBSD: stringlist.3,v 1.8 2002/02/07 07:00:17 ross Exp $
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.Dd November 28, 1999
.Os
.Dt STRINGLIST 3
.Sh NAME
.Nm stringlist ,
.Nm sl_init ,
.Nm sl_add ,
.Nm sl_free ,
.Nm sl_find
.Nd stringlist manipulation functions
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.Fd #include \*[Lt]stringlist.h\*[Gt]
.Ft StringList *
.Fn sl_init
.Ft int
.Fn sl_add "StringList *sl" "char *item"
.Ft void
.Fn sl_free "StringList *sl" "int freeall"
.Ft char *
.Fn sl_find "StringList *sl" "char *item"
.Sh DESCRIPTION
The
.Nm
functions manipulate stringlists, which are lists of
strings that extend automatically if necessary.
.Pp
The
.Ar StringList
structure has the following definition:
.Bd -literal -offset indent
typedef struct _stringlist {
	char	**sl_str;
	size_t	  sl_max;
	size_t	  sl_cur;
} StringList;
.Ed
.Pp
.Bl -tag -width "sl_str" -offset indent
.It Ar sl_str
a pointer to the base of the array containing the list.
.It Ar sl_max
the size of
.Ar sl_str .
.It Ar sl_cur
the offset in
.Ar sl_str
of the current element.
.El
.Pp
The following stringlist manipulation functions are available:
.Bl -tag -width "sl_init()"
.It Fn sl_init
Create a stringlist.
Returns a pointer to a
.Ar StringList ,
or
.Dv NULL
in case of failure.
.It Fn sl_free
Releases memory occupied by
.Ar sl
and the
.Ar sl-\*[Gt]sl_str
array.
If
.Ar freeall
is non-zero, then each of the items within
.Ar sl-\*[Gt]sl_str
is released as well.
.It Fn sl_add
Add
.Ar item
to
.Ar sl-\*[Gt]sl_str
at
.Ar sl-\*[Gt]sl_cur ,
extending the size of
.Ar sl-\*[Gt]sl_str .
Returns zero upon success, -1 upon failure.
.It Fn sl_find
Find
.Ar item
in
.Ar sl ,
returning NULL if it's not found.
.El
.Sh SEE ALSO
.Xr free 3 ,
.Xr malloc 3
.Sh HISTORY
The
.Nm
functions appeared in
.Nx 1.3 .