From 4e2ea4ccc948e867ec3781ce2eaeca491c6b9912 Mon Sep 17 00:00:00 2001
From: Nils Schimmelmann <nschimme@gmail.com>
Date: Mon, 20 May 2019 23:58:11 -0700
Subject: Allow the regular expression engine to be replaced with PCRE POSIX


diff --git a/cmd2.c b/cmd2.c
index 81275b6..2d8ab53 100644
--- a/cmd2.c
+++ b/cmd2.c
@@ -26,7 +26,9 @@
 #include <unistd.h>
 #include <errno.h>
 
-#ifdef USE_REGEXP
+#ifdef USE_PCREPOSIX
+# include <pcreposix.h>
+#elif defined(USE_REGEXP)
 # include <regex.h>
 #endif
 
diff --git a/configure.ac b/configure.ac
index a6b3fcd..bc51bdd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,6 +13,16 @@ AC_ARG_ENABLE(vt100,
 AS_IF([ test "${enable_vt100}" = yes ],
       [ AC_DEFINE(USE_VT100) ])
 
+AC_ARG_ENABLE(pcreposix,
+	AC_HELP_STRING([--enable-pcreposix],
+			[Use PCRE POSIX library for regular expressions [[default=no]]]),
+        ,
+        [enable_pcreposix="no"]
+)
+AS_IF([ test "${enable_pcreposix}" = yes ],
+      [ AC_DEFINE(USE_PCREPOSIX) ])
+
+
 AC_ARG_ENABLE(sort,
 	AC_HELP_STRING([--enable-sort],
 			[Sort aliases and actions [[default=no]]]),
@@ -99,6 +109,12 @@ AC_CHECK_HEADERS([stdlib.h unistd.h])
 AC_CHECK_HEADER([locale.h],
     [AC_CHECK_FUNC([putwc],[AC_DEFINE(USE_LOCALE)])])
 
+if test "x${enable_pcreposix}" == "xyes"; then
+    AC_CHECK_HEADER([pcreposix.h],
+        [AC_CHECK_FUNC([regcomp], [AC_CHECK_LIB(pcreposix,regcomp)])],
+        [AC_MSG_ERROR([*** pcreposix libraries not found])], [])
+fi
+
 AC_ARG_WITH([plugindir],
             AC_HELP_STRING([--with-plugindir=DIR],
                            [Plugin installation directory [[default=LIBDIR/powwow]]])],
@@ -128,6 +144,7 @@ Data directory:     $(eval eval eval echo "${datadir}/${PACKAGE}")
 Plugin directory:   $(eval eval eval echo "${plugindir}")
 
 enable-vt100:       ${enable_vt100}
+enable-pcreposix:   ${enable_pcreposix}
 enable-sort:        ${enable_sort}
 enable-noshell:     ${enable_noshell}
 enable-ansibug:     ${enable_ansibug}
diff --git a/list.c b/list.c
index e38021f..1bb0a65 100644
--- a/list.c
+++ b/list.c
@@ -18,7 +18,9 @@
 #include <sys/types.h>
 #include <sys/time.h>
 
-#ifdef USE_REGEXP
+#ifdef USE_PCREPOSIX
+# include <pcreposix.h>
+#elif defined(USE_REGEXP)
 # include <regex.h>
 #endif
 
diff --git a/main.c b/main.c
index 4da7606..e92d2ea 100644
--- a/main.c
+++ b/main.c
@@ -75,7 +75,9 @@
 extern int errno;
 extern int select();
 
-#ifdef USE_REGEXP
+#ifdef USE_PCREPOSIX
+# include <pcreposix.h>
+#elif defined(USE_REGEXP)
 # include <regex.h>
 #endif
 
@@ -437,6 +439,9 @@ void printver(void)
 #else
 	       " no regexp,"
 #endif
+#ifdef USE_PCREPOSIX
+	       " pcreposix,"
+#endif
 #ifdef USE_LOCALE
 	       " locale,"
 #endif
-- 
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