TODO.md

@@ -18,7 +18,7 @@
 
 ## File formats, encodings and standards
 
-- [x] migrate to pcre2, as pcre is obsolete
+- [ ] migrate to pcre2, as pcre is obsolete
 - [ ] use a more modern hash function than MD5
 - [ ] MIME support
 - [ ] support for GnuPG

configure.ac

@@ -34,35 +34,34 @@ AC_HEADER_DIRENT
 
 # Checks for libraries.
 
-# Check for PCRE2 library
-AC_ARG_WITH(pcre2, [  --without-pcre2          Compile without Perl regexp support],,
+# Check for PCRE library
+AC_ARG_WITH(pcre, [  --without-pcre          Compile without Perl regexp support],,
 [
-	AC_PATH_PROG(PCRE2_CONFIG, pcre2-config)
+	AC_PATH_PROG(PCRE_CONFIG, pcre-config)
 
-	if test "$PCRE2_CONFIG"; then
-	   CFLAGS="$CFLAGS `$PCRE2_CONFIG --cflags`"
-	   LIBS="$LIBS `$PCRE2_CONFIG --libs32`"
+	if test "$PCRE_CONFIG"; then
+	   CFLAGS="$CFLAGS `$PCRE_CONFIG --cflags`"
+	   LIBS="$LIBS `$PCRE_CONFIG --libs`"
 
 	   AC_LINK_IFELSE(
 	   [
-#define PCRE2_CODE_UNIT_WIDTH 32
-#include <pcre2.h>
+#include <pcre.h>
 
 int main ()
 {
   return 0;
 }
 	   ],
-	   AC_DEFINE(HAVE_LIBPCRE2),
+	   AC_DEFINE(HAVE_LIBPCRE),
 	   [
-		AC_MSG_NOTICE(found pcre2-config but could not compile test program.)
-		AC_MSG_FAILURE(is PCRE2 properly installed?)
+		AC_MSG_NOTICE(found pcre-config but could not compile test program.)
+		AC_MSG_FAILURE(is PCRE properly installed?)
 	   ]
 )
 	else
-	   AC_MSG_NOTICE(pcre2-config not found)
-	   AC_MSG_NOTICE(trying to find PCRE2 anyway)
-	   AC_CHECK_LIB(pcre2, main)
+	   AC_MSG_NOTICE(pcre-config not found)
+	   AC_MSG_NOTICE(trying to find PCRE anyway)
+	   AC_CHECK_LIB(pcre, main)
 	fi
 ]
 )

src/config.h.in

@@ -25,8 +25,8 @@
 /* Define to 1 if you have the `garfield' library (-lgarfield). */
 #undef HAVE_LIBGARFIELD
 
-/* Define to 1 if you have the `pcre2' library (-lpcre2). */
-#undef HAVE_LIBPCRE2
+/* Define to 1 if you have the `pcre' library (-lpcre). */
+#undef HAVE_LIBPCRE
 
 /* Define to 1 if you have the `z' library (-lz). */
 #undef HAVE_LIBZ

src/info.c

@@ -74,9 +74,9 @@ version (void)
 /*
   fprintf (stdout, "HAVE_LIBLOCKFILE ");
 */
-#ifdef HAVE_LIBPCRE2
-  print_wrap ("HAVE_LIBPCRE2");
-#endif /* HAVE_LIBPCRE2 */
+#ifdef HAVE_LIBPCRE
+  print_wrap ("HAVE_LIBPCRE");
+#endif /* HAVE_LIBPCRE */
 #ifdef HAVE_LIBZ
   print_wrap ("HAVE_LIBZ");
 #endif /* HAVE_LIBZ */
@@ -128,10 +128,10 @@ help (void)
            "Matching criteria:\n\n"
            "  -E,  --extended-regexp\tPATTERN is an extended regular expression\n"
            "  -G,  --basic-regexp\t\tPATTERN is a basic regular expression\n");
-#ifdef HAVE_LIBPCRE2
+#ifdef HAVE_LIBPCRE
   fprintf (stdout,
            "  -P,  --perl-regexp\t\tPATTERN is a Perl regular expression\n");
-#endif /* HAVE_LIBPCRE2 */
+#endif /* HAVE_LIBPCRE */
   fprintf (stdout,
            "  -e,  --regexp=PATTERN\t\tUse PATTERN as a regular expression\n"
            "  -i,  --ignore-case\t\tIgnore case distinctions\n"

src/main.c

@@ -99,11 +99,11 @@ main (int argc, char **argv)
 
   if (config.haveregex)
     {
-#ifdef HAVE_LIBPCRE2
+#ifdef HAVE_LIBPCRE
       if (config.regextype == REGEX_PERL)
         pcre_init ();
       else
-#endif /* HAVE_LIBPCRE2 */
+#endif /* HAVE_LIBPCRE */
         regex_init ();
     }
   else

src/mboxgrep.h

@@ -120,7 +120,7 @@ typedef struct
   char hostname[HOST_NAME_SIZE];
   char *boxname, *outboxname, *pipecmd, *tmpfilename, *regex_s;
 
-  void *pcre_pattern, *posix_pattern, *match_data;
+  void *pcre_pattern, *pcre_hints, *posix_pattern;
   int res1, res2;
 
   action_t action;

src/misc.c

@@ -373,7 +373,7 @@ set_option_regextype (regextype_t regextype)
       exit (2);
     }
 
-#ifndef HAVE_LIBPCRE2
+#ifndef HAVE_LIBPCRE
   if (regextype == REGEX_PERL);
     {
       fprintf (stderr,
@@ -381,6 +381,6 @@ set_option_regextype (regextype_t regextype)
               APPNAME);
       exit (2);
     }
-#endif /* HAVE_LIBPCRE2 */
+#endif /* HAVE_LIBPCRE */
   config.regextype = regextype;
 }

src/re.c

@@ -21,58 +21,52 @@
 #include <stdio.h>
 #include <string.h>
 #include <regex.h>
-#ifdef HAVE_LIBPCRE2
-#  define PCRE2_CODE_UNIT_WIDTH 32
-#  include <pcre2.h>
-#endif /* HAVE_LIBPCRE2 */
+#ifdef HAVE_LIBPCRE
+#  include <pcre.h>
+#endif /* HAVE_LIBPCRE */
 #include "mboxgrep.h"
 #include "message.h"
 #include "wrap.h"               /* xcalloc() et cetera */
 
-#ifdef HAVE_LIBPCRE2
+#ifdef HAVE_LIBPCRE
 void
 pcre_init (void)
 {
-  int errornumber;
-  PCRE2_SIZE erroroffset;
+  int errptr;
+  const char *error;
 
   config.pcre_pattern =
-    (pcre2_code *) pcre2_compile ((PCRE2_SPTR) config.regex_s, (PCRE2_SIZE) strlen (config.regex_s),
-                                  (config.ignorecase ? PCRE2_CASELESS : 0),
-                                  &errornumber, &erroroffset, NULL);
+    (pcre *) pcre_compile (config.regex_s,
+                           (config.ignorecase ? PCRE_CASELESS : 0),
+                           &error, &errptr, NULL);
   if (config.pcre_pattern == NULL)
     {
       if (config.merr)
-        {
-          PCRE2_UCHAR buffer[256];
-
-          pcre2_get_error_message (errornumber, buffer, sizeof(buffer));
-          fprintf (stderr, "%s: PCRE2 compilation failed at offset %d: %s\n",
-              APPNAME, (int) erroroffset, (char *) buffer);
-        }
+        fprintf (stderr, "%s: %s: %s\n", APPNAME, config.regex_s, error);
       exit (2);
     }
-
-  config.match_data =
-    (pcre2_match_data* ) pcre2_match_data_create_from_pattern (config.pcre_pattern, NULL);
 }
 
 void
 pcre_match (message_t * msg)
 {
+  int of[BUFSIZ];
+
   if (config.headers)
     config.res1 =
-      pcre2_match ((pcre2_code *) config.pcre_pattern,
-                   (PCRE2_SPTR) msg->headers, (int) strlen (msg->headers), 0, 0, config.match_data, NULL);
+      pcre_exec ((pcre *) config.pcre_pattern,
+                 (pcre_extra *) config.pcre_hints,
+                 msg->headers, (int) strlen (msg->headers), 0, 0, of, BUFSIZ);
   if (config.body)
     config.res2 =
-      pcre2_match ((pcre2_code *) config.pcre_pattern,
-                   (PCRE2_SPTR) msg->body, (int) strlen (msg->body), 0, 0, config.match_data, NULL);
+      pcre_exec ((pcre *) config.pcre_pattern,
+                 (pcre_extra *) config.pcre_hints,
+                 msg->body, (int) strlen (msg->body), 0, 0, of, BUFSIZ);
 
   config.res1 = config.res1 ^ 1;
   config.res2 = config.res2 ^ 1;
 }
-#endif /* HAVE_LIBPCRE2 */
+#endif /* HAVE_LIBPCRE */
 
 void
 regex_init (void)

src/re.h

@@ -19,9 +19,9 @@
 
 #include "mboxgrep.h"
 
-#ifdef HAVE_LIBPCRE2
+#ifdef HAVE_LIBPCRE
 void pcre_init (void);
 void pcre_match (message_t * msg);
-#endif /* HAVE_LIBPCRE2 */
+#endif /* HAVE_LIBPCRE */
 void regex_init (void);
 void regex_match (message_t * msg);

src/scan.c

@@ -146,11 +146,11 @@ scan_mailbox (char path[])
       if (msg->from == NULL)
         msg->from = (char *) xstrdup ("nobody");
 
-#ifdef HAVE_LIBPCRE2
+#ifdef HAVE_LIBPCRE
       if (config.regextype == REGEX_PERL)
         pcre_match (msg);
       else
-#endif /* HAVE_LIBPCRE2 */
+#endif /* HAVE_LIBPCRE */
         regex_match (msg);
 
       if (config.dedup)