bf764fc982
dpv(3): dialog progress view library dpv(1): stream data from stdin or multiple paths with dialog progress view figpar(3): configuration file parsing library Reviews: D714 Reviewed by: jelischer, shurd Discussed at: MeetBSD California 2014 Vendor/Dev Summit Discussed on: -current MFC after: 21 days X-MFC-to: stable/10 stable/9
252 lines
7.5 KiB
Groff
252 lines
7.5 KiB
Groff
.\" Copyright (c) 2013-2014 Devin Teske <dteske@FreeBSD.org>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 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.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd Oct 24, 2014
|
|
.Dt FIGPAR 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm figpar ,
|
|
.Nm parse_config ,
|
|
.Nm get_config_option
|
|
.Nd configuration file parsing library
|
|
.Sh LIBRARY
|
|
.Lb libfigpar
|
|
.Sh SYNOPSIS
|
|
.In figpar.h
|
|
.Ft int
|
|
.Fo parse_config
|
|
.Fa "struct fp_config options[], const char *path"
|
|
.Fa "int \*[lp]*unknown\*[rp]\*[lp]struct fp_config *option, uint32_t line"
|
|
.Fa "char *directive, char *value\*[rp], uint8_t processing_options"
|
|
.Fc
|
|
.Ft "struct fp_config *"
|
|
.Fo get_config_option
|
|
.Fa "struct fp_config options[], const char *directive"
|
|
.Fc
|
|
.In string_m.h
|
|
.Ft int
|
|
.Fo replaceall
|
|
.Fa "char *source, const char *find, const char *replace"
|
|
.Fc
|
|
.Ft unsigned int
|
|
.Fo strcount
|
|
.Fa "const char *source, const char *find"
|
|
.Fc
|
|
.Ft void
|
|
.Fo strexpand
|
|
.Fa "char *source"
|
|
.Fc
|
|
.Ft void
|
|
.Fo strexpandnl
|
|
.Fa "char *source"
|
|
.Fc
|
|
.Ft void
|
|
.Fo strtolower
|
|
.Fa "char *source"
|
|
.Fc
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
library provides a light-weight, portable framework for parsing configuration
|
|
files.
|
|
The library uses
|
|
.Xr open 2 ,
|
|
.Xr read 2 ,
|
|
and
|
|
.Xr lseek 2
|
|
within the file pointed to by
|
|
.Fa path
|
|
to find directives and values which are then made available to the application.
|
|
.Pp
|
|
Due to the fact that configuration files may have basic syntax differences,
|
|
the library does not attempt to impose any structure on the data but instead
|
|
provides raw data to a set of callback functions.
|
|
These callback functions can in-turn initiate abort through their return value,
|
|
allowing custom syntax validation during parsing.
|
|
.Pp
|
|
Configuration directives, types, and callback functions are provided through
|
|
data structures defined in
|
|
.In figpar.h :
|
|
.Bd -literal -offset indent
|
|
struct fp_config {
|
|
enum fp_cfgtype type; /* value type */
|
|
const char *directive; /* keyword */
|
|
union fp_cfgvalue value; /* value */
|
|
|
|
/* Pointer to function used when directive is found */
|
|
int (*action)(struct fp_config *option, uint32_t line,
|
|
char *directive, char *value);
|
|
};
|
|
|
|
enum fp_cfgtype {
|
|
FP_TYPE_NONE = 0x0000, /* for directives with no value */
|
|
FP_TYPE_BOOL = 0x0001, /* boolean */
|
|
FP_TYPE_INT = 0x0002, /* signed 32 bit integer */
|
|
FP_TYPE_UINT = 0x0004, /* unsigned 32 bit integer */
|
|
FP_TYPE_STR = 0x0008, /* string pointer */
|
|
FP_TYPE_STRARRAY = 0x0010, /* string array pointer */
|
|
FP_TYPE_DATA1 = 0x0020, /* void data type-1 (whatever) */
|
|
FP_TYPE_DATA2 = 0x0040, /* void data type-2 (whatever) */
|
|
FP_TYPE_DATA3 = 0x0080, /* void data type-3 (whatever) */
|
|
FP_TYPE_RESERVED1 = 0x0100, /* reserved data type-1 (future) */
|
|
FP_TYPE_RESERVED2 = 0x0200, /* reserved data type-2 (future) */
|
|
FP_TYPE_RESERVED3 = 0x0400, /* reserved data type-3 (future) */
|
|
};
|
|
|
|
union fp_cfgvalue {
|
|
void *data; /* Pointer to NUL-terminated string */
|
|
char *str; /* Pointer to NUL-terminated string */
|
|
char **strarray; /* Pointer to an array of strings */
|
|
int32_t num; /* Signed 32-bit integer value */
|
|
uint32_t u_num; /* Unsigned 32-bit integer value */
|
|
uint32_t boolean:1; /* Boolean integer value (0 or 1) */
|
|
};
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Fa processing_options
|
|
argument to
|
|
.Fn parse_config
|
|
is a mask of bit fields which indicate various
|
|
processing options.
|
|
The possible flags are as follows:
|
|
.Bl -tag -width FP_BREAK_ON_SEMICOLON
|
|
.It Dv FP_BREAK_ON_EQUALS
|
|
An equals sign
|
|
.Pq Ql Li =
|
|
is normally considered part of the directive.
|
|
This flag enables terminating the directive at the equals sign.
|
|
Also makes equals sign optional and transient.
|
|
.It Dv FP_BREAK_ON_SEMICOLON
|
|
A semicolon
|
|
.Pq Ql Li \;
|
|
is normally considered part of the value.
|
|
This flag enables terminating the value at the semicolon.
|
|
Also allows multiple statements on a single line separated by semicolon.
|
|
.It Dv FP_CASE_SENSITIVE
|
|
Normally directives are matched case insensitively using
|
|
.Xr fnmatch 3 .
|
|
This flag enables directive matching to be case sensitive.
|
|
.It Dv FP_REQUIRE_EQUALS
|
|
If a directive is not followed by an equals, processing is aborted.
|
|
.It Dv FP_STRICT_EQUALS
|
|
Equals must be part of the directive to be considered a delimiter between
|
|
directive and value.
|
|
.El
|
|
.Pp
|
|
The
|
|
.Fa options
|
|
struct array pointer can be NULL and every directive will invoke the
|
|
.Fn unknown
|
|
function argument.
|
|
.Pp
|
|
The directive for each fp_config item in the
|
|
.Fn parse_config
|
|
options argument is matched against each parsed directive using
|
|
.Xr fnmatch 3
|
|
until a match is found.
|
|
If a match is found, the
|
|
.Fn action
|
|
function for that fp_config directive is invoked with the line number,
|
|
directive, and value.
|
|
Otherwise if no match, the
|
|
.Fn unknown
|
|
function is invoked
|
|
.Pq with the same arguments .
|
|
.Pp
|
|
If either
|
|
.Fa action
|
|
or
|
|
.Fa unknown
|
|
return non-zero,
|
|
.Fn parse_config
|
|
aborts reading the file and returns the error value to its caller.
|
|
.Pp
|
|
.Fn get_config_option
|
|
traverses the options-array and returns the option that matches via
|
|
.Xr strcmp 3 ,
|
|
or if no match a pointer to a static dummy struct is returned
|
|
.Pq whose values are all zero or NULL .
|
|
.Pp
|
|
The use of
|
|
.Fa "struct fp_config"
|
|
is entirely optional as-is the use of
|
|
.Fa "enum fp_cfgtype"
|
|
or
|
|
.Fa "union fp_cfgvalue" .
|
|
For example, you could choose to pass a NULL pointer to
|
|
.Fn parse_config
|
|
for the first argument and then provide a simple
|
|
.Fa unknown
|
|
function based on
|
|
.Xr queue 3
|
|
that populates a singly-linked list of your own struct containing the
|
|
.Fa directive
|
|
and
|
|
.Fa value .
|
|
.Pp
|
|
In addition, the following miscellaneous string manipulation routines are
|
|
provided by
|
|
.In string_m.h :
|
|
.Bl -tag -width strexpandnl()
|
|
.It Fn replaceall
|
|
Replace all occurrences of
|
|
.Fa find
|
|
in
|
|
.Fa source
|
|
with
|
|
.Fa replace .
|
|
.It Fn strcount
|
|
Count the number of occurrences of one string that appear in the
|
|
.Fa source
|
|
string.
|
|
Return value is the total count.
|
|
An example use would be if you need to know how large a block of memory needs
|
|
to be for a
|
|
.Fn replaceall
|
|
series.
|
|
.It Fn strexpand
|
|
Expand escape sequences in a buffer pointed to by
|
|
.Fa source .
|
|
.It Fn strexpandnl
|
|
Expand only the escaped newlines in a buffer pointed to by
|
|
.Fa source .
|
|
.It Fn strtolower
|
|
Convert a string to lower case.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr queue 3
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
library first appeared in
|
|
.Fx 11.0 .
|
|
.Sh AUTHORS
|
|
.An Devin Teske Aq dteske@FreeBSD.org
|
|
.Sh BUGS
|
|
This is the first implementation of the library,
|
|
and the interface may be subject to refinement.
|