| <html lang="en"> |
| <head> |
| <title>Status of an Obstack - The GNU C Library</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="The GNU C Library"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Obstacks.html#Obstacks" title="Obstacks"> |
| <link rel="prev" href="Extra-Fast-Growing.html#Extra-Fast-Growing" title="Extra Fast Growing"> |
| <link rel="next" href="Obstacks-Data-Alignment.html#Obstacks-Data-Alignment" title="Obstacks Data Alignment"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| This file documents the GNU C library. |
| |
| This is Edition 0.12, last updated 2007-10-27, |
| of `The GNU C Library Reference Manual', for version |
| 2.8 (Sourcery G++ Lite 2011.03-41). |
| |
| Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, |
| 2003, 2007, 2008, 2010 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 the |
| Invariant Sections being ``Free Software Needs Free Documentation'' |
| and ``GNU Lesser General Public License'', the Front-Cover texts being |
| ``A GNU Manual'', and with the Back-Cover Texts as in (a) below. A |
| copy of the license is included in the section entitled "GNU Free |
| Documentation License". |
| |
| (a) The FSF's Back-Cover Text is: ``You have the freedom to |
| copy and modify this GNU manual. Buying copies from the FSF |
| supports it in developing GNU and promoting software freedom.''--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Status-of-an-Obstack"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Obstacks-Data-Alignment.html#Obstacks-Data-Alignment">Obstacks Data Alignment</a>, |
| Previous: <a rel="previous" accesskey="p" href="Extra-Fast-Growing.html#Extra-Fast-Growing">Extra Fast Growing</a>, |
| Up: <a rel="up" accesskey="u" href="Obstacks.html#Obstacks">Obstacks</a> |
| <hr> |
| </div> |
| |
| <h5 class="subsubsection">3.2.4.8 Status of an Obstack</h5> |
| |
| <p><a name="index-obstack-status-331"></a><a name="index-status-of-obstack-332"></a> |
| Here are functions that provide information on the current status of |
| allocation in an obstack. You can use them to learn about an object while |
| still growing it. |
| |
| <!-- obstack.h --> |
| <!-- GNU --> |
| <div class="defun"> |
| — Function: void * <b>obstack_base</b> (<var>struct obstack *obstack-ptr</var>)<var><a name="index-obstack_005fbase-333"></a></var><br> |
| <blockquote><p>This function returns the tentative address of the beginning of the |
| currently growing object in <var>obstack-ptr</var>. If you finish the object |
| immediately, it will have that address. If you make it larger first, it |
| may outgrow the current chunk—then its address will change! |
| |
| <p>If no object is growing, this value says where the next object you |
| allocate will start (once again assuming it fits in the current |
| chunk). |
| </p></blockquote></div> |
| |
| <!-- obstack.h --> |
| <!-- GNU --> |
| <div class="defun"> |
| — Function: void * <b>obstack_next_free</b> (<var>struct obstack *obstack-ptr</var>)<var><a name="index-obstack_005fnext_005ffree-334"></a></var><br> |
| <blockquote><p>This function returns the address of the first free byte in the current |
| chunk of obstack <var>obstack-ptr</var>. This is the end of the currently |
| growing object. If no object is growing, <code>obstack_next_free</code> |
| returns the same value as <code>obstack_base</code>. |
| </p></blockquote></div> |
| |
| <!-- obstack.h --> |
| <!-- GNU --> |
| <div class="defun"> |
| — Function: int <b>obstack_object_size</b> (<var>struct obstack *obstack-ptr</var>)<var><a name="index-obstack_005fobject_005fsize-335"></a></var><br> |
| <blockquote><p>This function returns the size in bytes of the currently growing object. |
| This is equivalent to |
| |
| <pre class="smallexample"> obstack_next_free (<var>obstack-ptr</var>) - obstack_base (<var>obstack-ptr</var>) |
| </pre> |
| </blockquote></div> |
| |
| </body></html> |
| |
