Synopsis

#include <pcre2.h>

int pcre2_config(uint32_t what, void *where);

Description

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:

what

A code specifying what information is required

where

Points to where to put the information

If where 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.

If where 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 all other codes it must point to a uint32_t integer variable. The available codes are:

PCRE2_CONFIG_BSR

Indicates what \R matches by default: PCRE2_BSR_UNICODE PCRE2_BSR_ANYCRLF

PCRE2_CONFIG_COMPILED_WIDTHS

Which of 8/16/32 support was compiled

PCRE2_CONFIG_DEPTHLIMIT

Default backtracking depth limit

PCRE2_CONFIG_EFFECTIVE_LINKSIZE

How many bytes are used for link size

PCRE2_CONFIG_HEAPLIMIT

Default heap memory limit

PCRE2_CONFIG_JIT

Availability of just-in-time compiler support (1=yes 0=no)

PCRE2_CONFIG_JITTARGET

Information (a string) about the target architecture for the JIT compiler

PCRE2_CONFIG_LINKSIZE

Configured internal link size (2, 3, 4)

PCRE2_CONFIG_MATCHLIMIT

Default internal resource limit

PCRE2_CONFIG_NEVER_BACKSLASH_C

Whether or not \C is disabled

PCRE2_CONFIG_NEWLINE

Code for the default newline sequence: PCRE2_NEWLINE_CR PCRE2_NEWLINE_LF PCRE2_NEWLINE_CRLF PCRE2_NEWLINE_ANY PCRE2_NEWLINE_ANYCRLF PCRE2_NEWLINE_NUL

PCRE2_CONFIG_PARENSLIMIT

Default parentheses nesting limit

PCRE2_CONFIG_RECURSIONLIMIT

Obsolete: use PCRE2_CONFIG_DEPTHLIMIT

PCRE2_CONFIG_STACKRECURSE

Obsolete: always returns 0

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)

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.

There is a complete description of the PCRE2 native API in the pcre2api page and a description of the POSIX API in the pcre2posix page.