allow grep -Pz

* NEWS: Document grep -P improvements.
* src/search.c (Pcompile): Remove restriction on grep -Pz.
* tests/pcre-z: New.
* tests/Makefile.am (TESTS): Add pcre-z.

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/pcre-z b/tests/pcre-z
new file mode 100755
index 00000000..17d9f955
--- /dev/null
+++ b/tests/pcre-z
@@ -0,0 +1,25 @@
+#!/bin/sh
+# Test Perl regex with NUL-separated input
+: ${srcdir=.}
+. "$srcdir/init.sh"; path_prepend_ ../src
+
+echo a | grep -P a >/dev/null 2>err || skip_ 'PCRE not available.'
+compare err /dev/null || fail_ 'PCRE available, but stderr not empty.'
+
+REGEX=a
+
+printf "%s\n0" abc def ghi aaa gah | tr 0 \\0 > in
+
+grep -z "$REGEX" in > exp 2>err || fail_ 'Cannot do BRE (grep -z) match.'
+compare err /dev/null || fail_ 'stderr not empty on grep -z.'
+
+# Sanity check the output
+test `grep -cz "$REGEX" in` 2>err = 3 || fail_ 'Incorrect BRE (grep -cz) match.'
+compare err /dev/null || fail_ 'stderr not empty on grep -cz.'
+
+fail=0
+grep -Pz "$REGEX" in > out 2>err || fail=1
+compare out exp || fail=1
+compare err /dev/null || fail=1
+
+Exit $fail