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diff --git a/doc/groff.html.node/Differences-from-AT_0026T-ms.html b/doc/groff.html.node/Differences-from-AT_0026T-ms.html new file mode 100644 index 0000000..6d45741 --- /dev/null +++ b/doc/groff.html.node/Differences-from-AT_0026T-ms.html @@ -0,0 +1,171 @@ +<!DOCTYPE html> +<html> +<!-- Created by GNU Texinfo 7.0.3, https://www.gnu.org/software/texinfo/ --> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> +<!-- This manual documents GNU troff version 1.23.0. + +Copyright © 1994-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with no +Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A +copy of the license is included in the section entitled "GNU Free +Documentation License". --> +<title>Differences from AT&T ms (The GNU Troff Manual)</title> + +<meta name="description" content="Differences from AT&T ms (The GNU Troff Manual)"> +<meta name="keywords" content="Differences from AT&T ms (The GNU Troff Manual)"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta name="viewport" content="width=device-width,initial-scale=1"> + +<link href="index.html" rel="start" title="Top"> +<link href="Request-Index.html" rel="index" title="Request Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="ms.html" rel="up" title="ms"> +<link href="ms-Naming-Conventions.html" rel="next" title="ms Naming Conventions"> +<link href="ms-Page-Layout.html" rel="prev" title="ms Page Layout"> +<style type="text/css"> +<!-- +a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em} +span.r {font-family: initial; font-weight: normal; font-style: normal} +span:hover a.copiable-link {visibility: visible} +strong.def-name {font-family: monospace; font-weight: bold; font-size: larger} +ul.mark-bullet {list-style-type: disc} +--> +</style> + + +</head> + +<body lang="en"> +<div class="subsection-level-extent" id="Differences-from-AT_0026T-ms"> +<div class="nav-panel"> +<p> +Next: <a href="ms-Naming-Conventions.html" accesskey="n" rel="next">Naming Conventions</a>, Previous: <a href="ms-Page-Layout.html" accesskey="p" rel="prev">Page layout</a>, Up: <a href="ms.html" accesskey="u" rel="up"><samp class="file">ms</samp></a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Request-Index.html" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<h4 class="subsection" id="Differences-from-AT_0026T-ms-1">4.6.7 Differences from <abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp></h4> +<a class="index-entry-id" id="index-ms-macros_002c-groff-differences-from-AT_0026T"></a> +<a class="index-entry-id" id="index-AT_0026T-ms_002c-macro-package-differences"></a> + +<p>The <code class="code">groff</code> <samp class="file">ms</samp> macros are an independent reimplementation, +using no <abbr class="acronym">AT&T</abbr> code. Since they take advantage of the extended +features of <code class="code">groff</code>, they cannot be used with <abbr class="acronym">AT&T</abbr> +<code class="code">troff</code>. <code class="code">groff</code> <samp class="file">ms</samp> supports features described above +as Berkeley and Tenth Edition Research Unix extensions, and adds several +of its own. +</p> +<ul class="itemize mark-bullet"> +<li>The internals of <code class="code">groff</code> <samp class="file">ms</samp> differ from the internals of +<abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp>. Documents that depend upon implementation +details of <abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp> may not format properly with +<code class="code">groff</code> <samp class="file">ms</samp>. Such details include macros whose function was +not documented in the <abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp> +manual.<a class="footnote" id="DOCF14" href="groff.html_fot.html#FOOT14"><sup>14</sup></a> + +</li><li>The error-handling policy of <code class="code">groff</code> <samp class="file">ms</samp> is to detect and +report errors, rather than to ignore them silently. + +</li><li>Tenth Edition Research Unix supported <code class="code">P1</code>/<code class="code">P2</code> macros to bracket code +examples; <code class="code">groff</code> <samp class="file">ms</samp> does not. + +</li><li><code class="code">groff</code> <samp class="file">ms</samp> does not work in GNU <code class="code">troff</code>’s +<abbr class="acronym">AT&T</abbr> compatibility mode. If loaded when that mode is enabled, +it aborts processing with a diagnostic message. + +</li><li>Multiple line spacing is not supported. Use a larger vertical spacing +instead. + +</li><li><code class="code">groff</code> <samp class="file">ms</samp> uses the same header and footer defaults in both +<code class="code">nroff</code> and <code class="code">troff</code> modes as <abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp> does in +<code class="code">troff</code> mode; <abbr class="acronym">AT&T</abbr>’s default in <code class="code">nroff</code> mode is to +put the date, in U.S. traditional format (e.g., “January 1, 2021”), +in the center footer (the <code class="code">CF</code> string). + +</li><li>Many <code class="code">groff</code> <samp class="file">ms</samp> macros, including those for paragraphs, +headings, and displays, cause a reset of paragraph rendering parameters, +and may change the indentation; they do so not by incrementing or +decrementing it, but by setting it absolutely. This can cause problems +for documents that define additional macros of their own that try to +manipulate indentation. Use the <samp class="file">ms</samp> <code class="code">RS</code> and <code class="code">RE</code> +macros instead of the <code class="code">in</code> request. + +</li><li><a class="index-entry-id" id="index-fractional-type-sizes-in-ms-macros"></a> +<a class="index-entry-id" id="index-ms-macros_002c-fractional-type-sizes-in"></a> +<abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp> interpreted the values of the registers +<code class="code">PS</code> and <code class="code">VS</code> in points, and did not support the use of +scaling units with them. <code class="code">groff</code> <samp class="file">ms</samp> interprets values of +the registers <code class="code">PS</code>, <code class="code">VS</code>, <code class="code">FPS</code>, and <code class="code">FVS</code> equal to +or larger than 1,000 (one thousand) as decimal fractions multiplied +by 1,000.<a class="footnote" id="DOCF15" href="groff.html_fot.html#FOOT15"><sup>15</sup></a> This threshold makes use of a +scaling unit with these parameters practical for high-resolution +devices while preserving backward compatibility. It also permits +expression of non-integral type sizes. For example, ‘<samp class="samp">groff +-rPS=10.5p</samp>’ at the shell prompt is equivalent to placing ‘<samp class="samp">.nr PS +10.5p</samp>’ at the beginning of the document. + +</li><li><abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp>’s <code class="code">AU</code> macro supported arguments used with +some document types; <code class="code">groff</code> <samp class="file">ms</samp> does not. + +</li><li>Right-aligned displays are available. The <abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp> +manual observes that “it is tempting to assume that ‘<samp class="samp">.DS R</samp>’ will +right adjust lines, but it doesn’t work”. In <code class="code">groff</code> <samp class="file">ms</samp>, +it does. + +</li><li>To make <code class="code">groff</code> <samp class="file">ms</samp> use the default page offset (which also +specifies the left margin), the <code class="code">PO</code> register must stay undefined +until the first <samp class="file">ms</samp> macro is called. + +<p>This implies that ‘<samp class="samp">\n[PO]</samp>’ should not be used early in the +document, unless it is changed also: accessing an undefined register +automatically defines it. +</p> +</li><li><code class="code">groff</code> <samp class="file">ms</samp> supports the <code class="code">PN</code> register, but it is not +necessary; you can access the page number via the usual <code class="code">%</code> +register and invoke the <code class="code">af</code> request to assign a different format +to it if desired.<a class="footnote" id="DOCF16" href="groff.html_fot.html#FOOT16"><sup>16</sup></a> + +</li><li>The <abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp> manual documents registers <code class="code">CW</code> and +<code class="code">GW</code> as setting the default column width and “intercolumn gap”, +respectively, and which applied when <code class="code">MC</code> was called with fewer +than two arguments. <code class="code">groff</code> <samp class="file">ms</samp> instead treats <code class="code">MC</code> +without arguments as synonymous with <code class="code">2C</code>; there is thus no +occasion for a default column width register. Further, the <code class="code">MINGW</code> +register and the second argument to <code class="code">MC</code> specify a <em class="emph">minimum</em> +space between columns, not the fixed gutter width of <abbr class="acronym">AT&T</abbr> +<samp class="file">ms</samp>. + +</li><li>The <abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp> manual did not document the <code class="code">QI</code> +register; Berkeley and <code class="code">groff</code> <samp class="file">ms</samp> do. +</li></ul> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_005cn_005bGS_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[GS]</code></strong><a class="copiable-link" href='#index-_005cn_005bGS_005d'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-GS-_005bms_005d"></a> +<p>The register <code class="code">GS</code> is set to 1 by the <code class="code">groff</code> <samp class="file">ms</samp> +macros, but is not used by the <abbr class="acronym">AT&T</abbr> <samp class="file">ms</samp> package. +Documents that need to determine whether they are being formatted with +<code class="code">groff</code> <samp class="file">ms</samp> or another implementation should test this +register. +</p></dd></dl> + + + +<ul class="mini-toc"> +<li><a href="Missing-Unix-Version-7-ms-Macros.html" accesskey="1">Unix Version 7 <samp class="file">ms</samp> macros not implemented by <code class="code">groff</code> <samp class="file">ms</samp></a></li> +</ul> +</div> +<hr> +<div class="nav-panel"> +<p> +Next: <a href="ms-Naming-Conventions.html">Naming Conventions</a>, Previous: <a href="ms-Page-Layout.html">Page layout</a>, Up: <a href="ms.html"><samp class="file">ms</samp></a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Request-Index.html" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |