property.3   [plain text]


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.\" $FreeBSD: src/lib/libutil/property.3,v 1.18 2005/01/20 09:17:07 ru Exp $
.\" "
.Dd October 7, 1998
.Os
.Dt PROPERTIES 3
.Sh NAME
.Nm properties_read ,
.Nm propery_find ,
.Nm properties_free
.Nd "functions to allow creating simple property lists from ASCII file data"
.Sh LIBRARY
.Lb libutil
.Sh SYNOPSIS
.In sys/types.h
.In libutil.h
.Ft properties
.Fn properties_read "int fd"
.Ft char *
.Fn property_find "properties list" "const char *name"
.Ft void
.Fn properties_free "properties list"
.Sh DESCRIPTION
.Bd -literal
typedef struct _properties {
	struct _properties *next;
	char *name;
	char *value;
} *properties;
.Ed
.Pp
The function
.Fn properties_read
reads
.Fa name = value
pairs from the file descriptor passed in
.Fa fd
and returns the head of a new property list, assuming that the
file's contents have been parsed properly, or NULL in case
of error.
.Pp
The
.Fn property_find
function returns the associated value string for the property named
.Fa name
if found, otherwise NULL.
The value returned may be up to
.Dv PROPERTY_MAX_VALUE
bytes in length.
.Pp
The
.Fn properties_free
function is used to free the structure returned by
.Fn properties_read
when it is no longer needed.
.Sh FILE FORMAT
Each property in the file is assumed to have the format of
.Fa name = value
where
.Fa name
is an alphanumeric string (and any punctuation not including the `=' character)
and
.Fa value
is an arbitary string of text terminated by a newline character.
If newlines
are desired, the entire value should be enclosed in { } (curly-bracket)
characters.
Any line beginning with a # or ; character is assumed to
be a comment and will be ignored.
.Sh SEE ALSO
.Xr auth_getval 3
.Sh AUTHORS
.An Jordan Hubbard
.Sh BUGS
Simplistic.