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 <h3 class="section">31.10 Utility Program Capacity Limits</h3>

 <p>The POSIX.2 standard specifies certain system limits that you can access
 through <code>sysconf</code> that apply to utility behavior rather than the
 behavior of the library or the operating system.

    <p>The GNU C library defines macros for these limits, and <code>sysconf</code>
 returns values for them if you ask; but these values convey no
 meaningful information.  They are simply the smallest values that
 POSIX.2 permits.

 <!-- limits.h -->
 <!-- POSIX.2 -->
 <div class="defun">
 &mdash; Macro: int <b>BC_BASE_MAX</b><var><a name="index-BC_005fBASE_005fMAX-3667"></a></var><br>
 <blockquote><p>The largest value of <code>obase</code> that the <code>bc</code> utility is
 guaranteed to support.
 </p></blockquote></div>

 <!-- limits.h -->
 <!-- POSIX.2 -->
 <div class="defun">
 &mdash; Macro: int <b>BC_DIM_MAX</b><var><a name="index-BC_005fDIM_005fMAX-3668"></a></var><br>
 <blockquote><p>The largest number of elements in one array that the <code>bc</code> utility
 is guaranteed to support.
 </p></blockquote></div>

 <!-- limits.h -->
 <!-- POSIX.2 -->
 <div class="defun">
 &mdash; Macro: int <b>BC_SCALE_MAX</b><var><a name="index-BC_005fSCALE_005fMAX-3669"></a></var><br>
 <blockquote><p>The largest value of <code>scale</code> that the <code>bc</code> utility is
 guaranteed to support.
 </p></blockquote></div>

 <!-- limits.h -->
 <!-- POSIX.2 -->
 <div class="defun">
 &mdash; Macro: int <b>BC_STRING_MAX</b><var><a name="index-BC_005fSTRING_005fMAX-3670"></a></var><br>
 <blockquote><p>The largest number of characters in one string constant that the
 <code>bc</code> utility is guaranteed to support.
 </p></blockquote></div>

 <!-- limits.h -->
 <!-- POSIX.2 -->
 <div class="defun">
 &mdash; Macro: int <b>COLL_WEIGHTS_MAX</b><var><a name="index-COLL_005fWEIGHTS_005fMAX-3671"></a></var><br>
 <blockquote><p>The largest number of weights that can necessarily be used in defining
 the collating sequence for a locale.
 </p></blockquote></div>

 <!-- limits.h -->
 <!-- POSIX.2 -->
 <div class="defun">
 &mdash; Macro: int <b>EXPR_NEST_MAX</b><var><a name="index-EXPR_005fNEST_005fMAX-3672"></a></var><br>
 <blockquote><p>The maximum number of expressions that can be nested within parenthesis
 by the <code>expr</code> utility.
 </p></blockquote></div>

 <!-- limits.h -->
 <!-- POSIX.2 -->
 <div class="defun">
 &mdash; Macro: int <b>LINE_MAX</b><var><a name="index-LINE_005fMAX-3673"></a></var><br>
 <blockquote><p>The largest text line that the text-oriented POSIX.2 utilities can
 support.  (If you are using the GNU versions of these utilities, then
 there is no actual limit except that imposed by the available virtual
 memory, but there is no way that the library can tell you this.)
 </p></blockquote></div>

 <!-- limits.h -->
 <!-- POSIX.2 -->
 <div class="defun">
 &mdash; Macro: int <b>EQUIV_CLASS_MAX</b><var><a name="index-EQUIV_005fCLASS_005fMAX-3674"></a></var><br>
 <blockquote><p>The maximum number of weights that can be assigned to an entry of the
 <code>LC_COLLATE</code> category &lsquo;<samp><span class="samp">order</span></samp>&rsquo; keyword in a locale definition.
 The GNU C library does not presently support locale definitions.
 </p></blockquote></div>

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	Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002,
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	Invariant Sections being ``Free Software Needs Free Documentation''
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	Next: <a rel="next" accesskey="n" href="Utility-Minimums.html#Utility-Minimums">Utility Minimums</a>,
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	<hr>
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	<h3 class="section">31.10 Utility Program Capacity Limits</h3>

	<p>The POSIX.2 standard specifies certain system limits that you can access
	through <code>sysconf</code> that apply to utility behavior rather than the
	behavior of the library or the operating system.

	<p>The GNU C library defines macros for these limits, and <code>sysconf</code>
	returns values for them if you ask; but these values convey no
	meaningful information. They are simply the smallest values that
	POSIX.2 permits.

	<!-- limits.h -->
	<!-- POSIX.2 -->
	<div class="defun">
	— Macro: int <b>BC_BASE_MAX</b><var><a name="index-BC_005fBASE_005fMAX-3667"></a></var><br>
	<blockquote><p>The largest value of <code>obase</code> that the <code>bc</code> utility is
	guaranteed to support.
	</p></blockquote></div>

	<!-- limits.h -->
	<!-- POSIX.2 -->
	<div class="defun">
	— Macro: int <b>BC_DIM_MAX</b><var><a name="index-BC_005fDIM_005fMAX-3668"></a></var><br>
	<blockquote><p>The largest number of elements in one array that the <code>bc</code> utility
	is guaranteed to support.
	</p></blockquote></div>

	<!-- limits.h -->
	<!-- POSIX.2 -->
	<div class="defun">
	— Macro: int <b>BC_SCALE_MAX</b><var><a name="index-BC_005fSCALE_005fMAX-3669"></a></var><br>
	<blockquote><p>The largest value of <code>scale</code> that the <code>bc</code> utility is
	guaranteed to support.
	</p></blockquote></div>

	<!-- limits.h -->
	<!-- POSIX.2 -->
	<div class="defun">
	— Macro: int <b>BC_STRING_MAX</b><var><a name="index-BC_005fSTRING_005fMAX-3670"></a></var><br>
	<blockquote><p>The largest number of characters in one string constant that the
	<code>bc</code> utility is guaranteed to support.
	</p></blockquote></div>

	<!-- limits.h -->
	<!-- POSIX.2 -->
	<div class="defun">
	— Macro: int <b>COLL_WEIGHTS_MAX</b><var><a name="index-COLL_005fWEIGHTS_005fMAX-3671"></a></var><br>
	<blockquote><p>The largest number of weights that can necessarily be used in defining
	the collating sequence for a locale.
	</p></blockquote></div>

	<!-- limits.h -->
	<!-- POSIX.2 -->
	<div class="defun">
	— Macro: int <b>EXPR_NEST_MAX</b><var><a name="index-EXPR_005fNEST_005fMAX-3672"></a></var><br>
	<blockquote><p>The maximum number of expressions that can be nested within parenthesis
	by the <code>expr</code> utility.
	</p></blockquote></div>

	<!-- limits.h -->
	<!-- POSIX.2 -->
	<div class="defun">
	— Macro: int <b>LINE_MAX</b><var><a name="index-LINE_005fMAX-3673"></a></var><br>
	<blockquote><p>The largest text line that the text-oriented POSIX.2 utilities can
	support. (If you are using the GNU versions of these utilities, then
	there is no actual limit except that imposed by the available virtual
	memory, but there is no way that the library can tell you this.)
	</p></blockquote></div>

	<!-- limits.h -->
	<!-- POSIX.2 -->
	<div class="defun">
	— Macro: int <b>EQUIV_CLASS_MAX</b><var><a name="index-EQUIV_005fCLASS_005fMAX-3674"></a></var><br>
	<blockquote><p>The maximum number of weights that can be assigned to an entry of the
	<code>LC_COLLATE</code> category ‘<samp><span class="samp">order</span></samp>’ keyword in a locale definition.
	The GNU C library does not presently support locale definitions.
	</p></blockquote></div>

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