1<html> 2<head> 3<title>pcre2_set_compile_recursion_guard specification</title> 4</head> 5<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB"> 6<h1>pcre2_set_compile_recursion_guard man page</h1> 7<p> 8Return to the <a href="index.html">PCRE2 index page</a>. 9</p> 10<p> 11This page is part of the PCRE2 HTML documentation. It was generated 12automatically from the original man page. If there is any nonsense in it, 13please consult the man page, in case the conversion went wrong. 14<br> 15<br><b> 16SYNOPSIS 17</b><br> 18<P> 19<b>#include <pcre2.h></b> 20</P> 21<P> 22<b>int pcre2_set_compile_recursion_guard(pcre2_compile_context *<i>ccontext</i>,</b> 23<b> int (*<i>guard_function</i>)(uint32_t, void *), void *<i>user_data</i>);</b> 24</P> 25<br><b> 26DESCRIPTION 27</b><br> 28<P> 29This function defines, within a compile context, a function that is called 30whenever <b>pcre2_compile()</b> starts to compile a parenthesized part of a 31pattern. The first argument to the function gives the current depth of 32parenthesis nesting, and the second is user data that is supplied when the 33function is set up. The callout function should return zero if all is well, or 34non-zero to force an error. This feature is provided so that applications can 35check the available system stack space, in order to avoid running out. The 36result of <b>pcre2_set_compile_recursion_guard()</b> is always zero. 37</P> 38<P> 39There is a complete description of the PCRE2 native API in the 40<a href="pcre2api.html"><b>pcre2api</b></a> 41page and a description of the POSIX API in the 42<a href="pcre2posix.html"><b>pcre2posix</b></a> 43page. 44<p> 45Return to the <a href="index.html">PCRE2 index page</a>. 46</p> 47