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-.\"	$Id: roff.3,v 1.10 2011/01/01 16:18:39 kristaps Exp $
-.\"
-.\" Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: January 1 2011 $
-.Dt ROFF 3
-.Os
-.Sh NAME
-.Nm roff ,
-.Nm roff_alloc ,
-.Nm roff_endparse ,
-.Nm roff_free ,
-.Nm roff_parseln ,
-.Nm roff_reset ,
-.Nm roff_span
-.Nd roff macro compiler library
-.Sh SYNOPSIS
-.In mandoc.h
-.In roff.h
-.Ft "struct roff *"
-.Fo roff_alloc
-.Fa "struct regset *regs"
-.Fa "void *data"
-.Fa "mandocmsg msgs"
-.Fc
-.Ft void
-.Fn roff_endparse "struct roff *roff"
-.Ft void
-.Fn roff_free "struct roff *roff"
-.Ft "enum rofferr"
-.Fo roff_parseln
-.Fa "struct roff *roff"
-.Fa "int line"
-.Fa "char **bufp"
-.Fa "size_t *bufsz"
-.Fa "int pos"
-.Fa "int *offs"
-.Fc
-.Ft void
-.Fn roff_reset "struct roff *roff"
-.Ft "const struct tbl_span *"
-.Fn roff_span "const struct roff *roff"
-.Sh DESCRIPTION
-The
-.Nm
-library processes lines of
-.Xr roff 7
-input.
-.Pp
-In general, applications initiate a parsing sequence with
-.Fn roff_alloc ,
-parse each line in a document with
-.Fn roff_parseln ,
-close the parsing session with
-.Fn roff_endparse ,
-and finally free all allocated memory with
-.Fn roff_free .
-The
-.Fn roff_reset
-function may be used in order to reset the parser for another input
-sequence.
-.Pp
-The
-.Fn roff_parseln
-function should be invoked before passing a line into the
-.Xr mdoc 3
-or
-.Xr man 3
-libraries.
-.Pp
-See the
-.Sx EXAMPLES
-section for a full example.
-.Sh REFERENCE
-This section further defines the
-.Sx Types
-and
-.Sx Functions
-available to programmers.
-.Ss Types
-Functions (see
-.Sx Functions )
-may use the following types:
-.Bl -ohang
-.It Vt "enum rofferr"
-Instructions for further processing to the caller of
-.Fn roff_parseln .
-.It Vt struct roff
-An opaque type defined in
-.Pa roff.c .
-Its values are only used privately within the library.
-.It Vt mandocmsg
-A function callback type defined in
-.Pa mandoc.h .
-.El
-.Ss Functions
-Function descriptions follow:
-.Bl -ohang
-.It Fn roff_alloc
-Allocates a parsing structure.
-The
-.Fa data
-pointer is passed to
-.Fa msgs .
-Returns NULL on failure.
-If non-NULL, the pointer must be freed with
-.Fn roff_free .
-.It Fn roff_reset
-Reset the parser for another parse routine.
-After its use,
-.Fn roff_parseln
-behaves as if invoked for the first time.
-.It Fn roff_free
-Free all resources of a parser.
-The pointer is no longer valid after invocation.
-.It Fn roff_parseln
-Parse a nil-terminated line of input.
-The character array
-.Fa bufp
-may be modified or reallocated within this function.
-In the latter case,
-.Fa bufsz
-will be modified accordingly.
-The
-.Fa offs
-pointer will be modified if the line start during subsequent processing
-of the line is not at the zeroth index.
-This line should not contain the trailing newline.
-Returns 0 on failure, 1 on success.
-.It Fn roff_endparse
-Signals that the parse is complete.
-.It Fn roff_span
-If
-.Fn roff_parseln
-returned
-.Va ROFF_TBL ,
-return the last parsed table row.
-Returns NULL otherwise.
-.El
-.Sh EXAMPLES
-See
-.Pa main.c
-in the source distribution for an example of usage.
-.Sh SEE ALSO
-.Xr mandoc 1 ,
-.Xr man 3 ,
-.Xr mdoc 3 ,
-.Xr roff 7
-.Sh AUTHORS
-The
-.Nm
-library was written by
-.An Kristaps Dzonsons Aq kristaps@bsd.lv .
-.Sh BUGS
-The implementation of user-defined strings needs improvement:
-.Bl -dash
-.It
-String values are taken literally and are not interpreted.
-.It
-Parsing of quoted strings is incomplete.
-.It
-The stings are stored internally using a singly linked list,
-which is fine for small numbers of strings,
-but ineffient when handling many strings.
-.El