grep: improve PCRE2 version output

* src/grep.c: No need to include pcre2.h.
(main) [HAVE_LIBPCRE]: Call Pprint_version instead of
doing it ourselves.
* src/pcresearch.c (Pprint_version): New function.
It also checks belatedly for buffer overflow, and
says "grep -P uses PCRE2" instead of "Built with PCRE".
* tests/version-pcre: Adjust test to match.

1 files changed, 1 insertions, 9 deletions

diff --git a/src/grep.c b/src/grep.c
index bd776e8b..491dd028 100644
--- a/src/grep.c
+++ b/src/grep.c
@@ -29,11 +29,6 @@
 #include <stdio.h>
 #include "system.h"
 
-#if HAVE_LIBPCRE
-# define PCRE2_CODE_UNIT_WIDTH 8
-# include <pcre2.h>
-#endif
-
 #include "argmatch.h"
 #include "c-ctype.h"
 #include "c-stack.h"
@@ -2836,10 +2831,7 @@ main (int argc, char **argv)
       puts (_("Written by Mike Haertel and others; see\n"
               "<https://git.savannah.gnu.org/cgit/grep.git/tree/AUTHORS>."));
 #if HAVE_LIBPCRE
-      unsigned char buf[128];
-      (void) pcre2_config (PCRE2_CONFIG_VERSION, buf);
-      fputs (_("\nBuilt with PCRE "), stdout);
-      puts ((char *) buf);
+      Pprint_version ();
 #endif
       return EXIT_SUCCESS;
     }