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236 lines
5.4 KiB
Groff
236 lines
5.4 KiB
Groff
.\" $Id: mchars_alloc.3,v 1.2 2014/10/26 18:07:28 schwarze Exp $
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.\"
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.\" Copyright (c) 2014 Ingo Schwarze <schwarze@openbsd.org>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd $Mdocdate: October 26 2014 $
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.Dt MCHARS_ALLOC 3
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.Os
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.Sh NAME
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.Nm mchars_alloc ,
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.Nm mchars_free ,
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.Nm mchars_num2char ,
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.Nm mchars_num2uc ,
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.Nm mchars_spec2cp ,
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.Nm mchars_spec2str
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.Nd character table for mandoc
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.Sh LIBRARY
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.Lb libmandoc
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.Sh SYNOPSIS
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.In sys/types.h
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.In mandoc.h
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.Ft "struct mchars *"
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.Fn mchars_alloc "void"
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.Ft void
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.Fo mchars_free
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.Fa "struct mchars *table"
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.Fc
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.Ft char
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.Fo mchars_num2char
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.Fa "const char *decimal"
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.Fa "size_t sz"
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.Fc
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.Ft int
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.Fo mchars_num2uc
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.Fa "const char *hexadecimal"
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.Fa "size_t sz"
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.Fc
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.Ft int
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.Fo mchars_spec2cp
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.Fa "const struct mchars *table"
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.Fa "const char *name"
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.Fa "size_t sz"
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.Fc
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.Ft "const char *"
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.Fo mchars_spec2str
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.Fa "const struct mchars *table"
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.Fa "const char *name"
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.Fa "size_t sz"
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.Fa "size_t *rsz"
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.Fc
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.Ft "const char *"
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.Fn mchars_uc2str "int codepoint"
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.Sh DESCRIPTION
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These functions translate Unicode character numbers and
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.Xr roff 7
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character names into glyphs.
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See
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.Xr mandoc_char 7
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for a list of
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.Xr roff 7
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special characters.
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These functions are intended for external use by programs formatting
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.Xr mdoc 7
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and
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.Xr man 7
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pages for output, for example the
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.Xr mandoc 1
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output formatter modules and
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.Xr makewhatis 8 .
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The
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.Fa decimal ,
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.Fa hexadecimal ,
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.Fa name ,
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and
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.Fa size
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input arguments are usually obtained from the
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.Xr mandoc_escape 3
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parser function.
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.Pp
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The function
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.Fn mchars_num2char
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converts a
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.Fa decimal
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string representation of a character number consisting of
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.Fa sz
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digits into a printable ASCII character.
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If the input string is non-numeric or does not represent a printable
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ASCII character, the NUL character
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.Pq Sq \e0
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is returned.
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For example, the
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.Xr mandoc 1
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.Fl Tascii ,
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.Fl Tutf8 ,
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and
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.Fl Thtml
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output modules use this function to render
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.Xr roff 7
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.Ic \eN
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escape sequences.
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.Pp
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The function
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.Fn mchars_num2uc
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converts a
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.Fa hexadecimal
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string representation of a Unicode codepoint consisting of
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.Fa sz
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digits into an integer representation.
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If the input string is non-numeric or represents an ASCII character,
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the NUL character
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.Pq Sq \e0
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is returned.
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For example, the
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.Xr mandoc 1
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.Fl Tutf8
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and
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.Fl Thtml
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output modules use this function to render
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.Xr roff 7
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.Ic \e[u Ns Ar XXXX Ns Ic \&]
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and
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.Ic \eC\(aqu Ns Ar XXXX Ns Ic \(aq
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escape sequences.
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.Pp
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The function
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.Fn mchars_alloc
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allocates an opaque
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.Vt "struct mchars *"
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table object for subsequent use by the following two lookup functions.
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When no longer needed, this object can be destroyed with
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.Fn mchars_free .
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.Pp
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The function
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.Fn mchars_spec2cp
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looks up a
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.Xr roff 7
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special character
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.Fa name
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consisting of
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.Fa sz
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characters in the
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.Fa table
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and returns the corresponding Unicode codepoint.
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If the
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.Ar name
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is not recognized, \-1 is returned.
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For example, the
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.Xr mandoc 1
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.Fl Tutf8
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and
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.Fl Thtml
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output modules use this function to render
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.Xr roff 7
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.Ic \e[ Ns Ar name Ns Ic \&]
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and
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.Ic \eC\(aq Ns Ar name Ns Ic \(aq
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escape sequences.
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.Pp
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The function
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.Fn mchars_spec2str
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looks up a
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.Xr roff 7
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special character
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.Fa name
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consisting of
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.Fa sz
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characters in the
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.Fa table
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and returns an ASCII string representation.
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The length of the representation is returned in
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.Fa rsz .
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In many cases, the meaning of such ASCII representations
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is not quite obvious, so using
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.Xr roff 7
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special characters in documents intended for ASCII rendering
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is usually a bad idea.
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If the
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.Ar name
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is not recognized,
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.Dv NULL
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is returned.
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For example,
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.Xr makewhatis 8
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and the
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.Xr mandoc 1
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.Fl Tascii
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output module use this function to render
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.Xr roff 7
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.Ic \e[ Ns Ar name Ns Ic \&]
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and
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.Ic \eC\(aq Ns Ar name Ns Ic \(aq
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escape sequences.
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.Pp
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The function
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.Fn mchars_uc2str
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performs a reverse lookup of the Unicode
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.Fa codepoint
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and returns an ASCII string representation, or the string
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.Qq <?>
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if none is available.
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.Sh FILES
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These funtions are implemented in the file
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.Pa chars.c .
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.Sh SEE ALSO
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.Xr mandoc 1 ,
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.Xr mandoc_escape 3 ,
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.Xr mandoc_char 7 ,
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.Xr roff 7
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.Sh HISTORY
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These functions and their predecessors have been available since the
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following mandoc versions:
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.Bl -column "mchars_num2char()" "1.11.3" "chars_num2char()" "1.10.10"
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.It Sy function Ta since Ta Sy predecessor Ta since
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.It Fn mchars_alloc Ta 1.11.3 Ta Fn ascii2htab Ta 1.5.3
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.It Fn mchars_free Ta 1.11.2 Ta Fn asciifree Ta 1.6.0
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.It Fn mchars_num2char Ta 1.11.2 Ta Fn chars_num2char Ta 1.10.10
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.It Fn mchars_num2uc Ta 1.11.3 Ta \(em Ta \(em
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.It Fn mchars_spec2cp Ta 1.11.2 Ta Fn chars_spec2cp Ta 1.10.5
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.It Fn mchars_spec2str Ta 1.11.2 Ta Fn a2ascii Ta 1.5.3
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.It Fn mchars_uc2str Ta 1.13.2 Ta \(em Ta \(em
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.El
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.Sh AUTHORS
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.An Kristaps Dzonsons Aq Mt kristaps@bsd.lv
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.An Ingo Schwarze Aq Mt schwarze@openbsd.org
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