Implement compile-time nested parentheses limit, specified at build time.

git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1389 2f5784b3-3f2a-0410-8824-cb99058d5e15

3 files changed, 17 insertions, 6 deletions

diff --git a/doc/pcre_config.3 b/doc/pcre_config.3
index 5a6e6be..8900416 100644
--- a/doc/pcre_config.3
+++ b/doc/pcre_config.3
@@ -1,4 +1,4 @@
-.TH PCRE_CONFIG 3 "24 June 2012" "PCRE 8.30"
+.TH PCRE_CONFIG 3 "05 November 2013" "PCRE 8.34"
 .SH NAME
 PCRE - Perl-compatible regular expressions
 .SH SYNOPSIS
@@ -33,6 +33,7 @@ point to an unsigned long integer. The available codes are:
                               target architecture for the JIT compiler,
                               or NULL if there is no JIT support
   PCRE_CONFIG_LINK_SIZE     Internal link size: 2, 3, or 4
+  PCRE_CONFIG_PARENS_LIMIT  Parentheses nesting limit 
   PCRE_CONFIG_MATCH_LIMIT   Internal resource limit
   PCRE_CONFIG_MATCH_LIMIT_RECURSION
                             Internal recursion depth limit
diff --git a/doc/pcreapi.3 b/doc/pcreapi.3
index 7138d1d..ed71b77 100644
--- a/doc/pcreapi.3
+++ b/doc/pcreapi.3
@@ -1,4 +1,4 @@
-.TH PCREAPI 3 "08 October 2013" "PCRE 8.34"
+.TH PCREAPI 3 "05 November 2013" "PCRE 8.34"
 .SH NAME
 PCRE - Perl-compatible regular expressions
 .sp
@@ -460,6 +460,13 @@ the
 .\"
 documentation.
 .sp
+  PCRE_CONFIG_PARENS_LIMIT
+.sp
+The output is a long integer that gives the maximum depth of nesting of 
+parentheses (of any kind) in a pattern. This limit is imposed to cap the amount 
+of system stack used when a pattern is compiled. It is specified when PCRE is
+built; the default is 250.
+.sp
   PCRE_CONFIG_MATCH_LIMIT
 .sp
 The output is a long integer that gives the default limit for the number of
@@ -2870,6 +2877,6 @@ Cambridge CB2 3QH, England.
 .rs
 .sp
 .nf
-Last updated: 08 October 2013
+Last updated: 05 November 2013
 Copyright (c) 1997-2013 University of Cambridge.
 .fi
diff --git a/doc/pcrelimits.3 b/doc/pcrelimits.3
index 1541a27..423d6a2 100644
--- a/doc/pcrelimits.3
+++ b/doc/pcrelimits.3
@@ -1,4 +1,4 @@
-.TH PCRELIMITS 3 "15 August 2013" "PCRE 8.34"
+.TH PCRELIMITS 3 "05 November 2013" "PCRE 8.34"
 .SH NAME
 PCRE - Perl-compatible regular expressions
 .SH "SIZE AND OTHER LIMITATIONS"
@@ -24,7 +24,10 @@ However, the speed of execution is slower.
 All values in repeating quantifiers must be less than 65536.
 .P
 There is no limit to the number of parenthesized subpatterns, but there can be
-no more than 65535 capturing subpatterns.
+no more than 65535 capturing subpatterns. There is, however, a limit to the
+depth of nesting of parenthesized subpatterns of all kinds. This is imposed in
+order to limit the amount of system stack used at compile time. The limit can
+be specified when PCRE is built; the default is 250.
 .P
 There is a limit to the number of forward references to subsequent subpatterns
 of around 200,000. Repeated forward references with fixed upper limits, for
@@ -63,6 +66,6 @@ Cambridge CB2 3QH, England.
 .rs
 .sp
 .nf
-Last updated: 15 August 2013
+Last updated: 05 November 2013
 Copyright (c) 1997-2013 University of Cambridge.
 .fi