.TH PCRE2_CONFIG 3 "20 April 2014" "PCRE2 10.0"
.SH NAME
PCRE2 - Perl-compatible regular expressions (revised API)
.SH SYNOPSIS
.rs
.sp
.B #include <pcre2.h>
.PP
.SM
.B int pcre2_config(uint32_t \fIwhat\fP, void *\fIwhere\fP);
.
.SH DESCRIPTION
.rs
.sp
This function makes it possible for a client program to find out which optional
features are available in the version of the PCRE2 library it is using. The
arguments are as follows:
.sp
  \fIwhat\fP     A code specifying what information is required
  \fIwhere\fP    Points to where to put the information
.sp
If \fIwhere\fP is NULL, the function returns the amount of memory needed for
the requested information. When the information is a string, the value is in
code units; for other types of data it is in bytes.
.P
If \fBwhere\fP is not NULL, for PCRE2_CONFIG_JITTARGET,
PCRE2_CONFIG_UNICODE_VERSION, and PCRE2_CONFIG_VERSION it must point to a
buffer that is large enough to hold the string. For PCRE2_CONFIG_MATCHLIMIT,
PCRE2_CONFIG_PARENSLIMIT, and PCRE2_CONFIG_RECURSIONLIMIT it must point to an
unsigned long int variable, and for all other codes to an int variable. The
available codes are:
.sp
  PCRE2_CONFIG_BSR             Indicates what \eR matches by default:
                                 0    all Unicode line endings
                                 1    CR, LF, or CRLF only
  PCRE2_CONFIG_JIT             Availability of just-in-time compiler
                                support (1=yes 0=no)
  PCRE2_CONFIG_JITTARGET       Information about the target archi-
                                 tecture for the JIT compiler
  PCRE2_CONFIG_LINKSIZE        Configured internal link size (2, 3, 4)
  PCRE2_CONFIG_MATCHLIMIT      Default internal resource limit
  PCRE2_CONFIG_NEWLINE         Code for the default newline sequence:
                                 1    for CR
                                 2    for LF
                                 3    for CRLF
                                 4    for ANY
                                 5    for ANYCRLF
  PCRE2_CONFIG_PARENSLIMIT     Default parentheses nesting limit
  PCRE2_CONFIG_RECURSIONLIMIT  Internal recursion depth limit
  PCRE2_CONFIG_STACKRECURSE    Recursion implementation (1=stack
                                 0=heap)
  PCRE2_CONFIG_UNICODE         Availability of Unicode support (1=yes
                                 0=no)
  PCRE2_CONFIG_UNICODE_VERSION The Unicode version (a string)
  PCRE2_CONFIG_VERSION         The PCRE2 version (a string)
.sp
The function yields a non-negative value on success or the negative value
PCRE2_ERROR_BADOPTION otherwise. This is also the result for the
PCRE2_CONFIG_JITTARGET code if JIT support is not available. When a string is
requested, the function returns the number of code units used, including the
terminating zero.
.P
There is a complete description of the PCRE2 native API in the
.\" HREF
\fBpcre2api\fP
.\"
page and a description of the POSIX API in the
.\" HREF
\fBpcre2posix\fP
.\"
page.