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| author | Gray Wolf | 2020-04-29 15:49:17 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2020-04-29 16:01:42 +0200 |
| commit | c3295d233b6a7d924814eec9a5c5999a876daf9e (patch) | |
| tree | 2281617cafa2ec0e9def7bf0ee5da3280e724c77 | |
| parent | 1c462d47a0bc92f9f57af223456df53169acf3fe (diff) | |
| download | busybox-c3295d233b6a7d924814eec9a5c5999a876daf9e.zip busybox-c3295d233b6a7d924814eec9a5c5999a876daf9e.tar.gz | |
grep: Fix -f FILE when FILE is empty and -x provided
Grep currently special-cased empty pattern file to be the same as
pattern file with one empty line (empty pattern). That does mirror how
GNU grep behaves, except when -x is provided. In that case .* pattern
needs to be used instead.
Signed-off-by: Gray Wolf <wolf@wolfsden.cz>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | findutils/grep.c | 5 | ||||
| -rwxr-xr-x | testsuite/grep.tests | 6 |
2 files changed, 9 insertions, 2 deletions
diff --git a/findutils/grep.c b/findutils/grep.c index 5b8644c..84a6f7b 100644 --- a/findutils/grep.c +++ b/findutils/grep.c @@ -762,8 +762,9 @@ int grep_main(int argc UNUSED_PARAM, char **argv) if (option_mask32 & OPT_f) { load_regexes_from_file(fopt); if (!pattern_head) { /* -f EMPTY_FILE? */ - /* GNU grep treats it as "nothing matches" */ - llist_add_to(&pattern_head, new_grep_list_data((char*) "", 0)); + /* GNU grep treats it as "nothing matches" except when -x */ + const char *data = (option_mask32 & OPT_x) ? ".*" : ""; + llist_add_to(&pattern_head, new_grep_list_data((char*)data, 0)); invert_search ^= 1; } } diff --git a/testsuite/grep.tests b/testsuite/grep.tests index 26f8e69..9c1f354 100755 --- a/testsuite/grep.tests +++ b/testsuite/grep.tests @@ -129,6 +129,12 @@ testing "grep -v -f EMPTY_FILE" \ "" \ "test\n" +testing "grep -vxf EMPTY_FILE" \ + "grep -vxf input" \ + "test\n" \ + "" \ + "test\n" + testing "grep -Fw matches only words" \ "grep -Fw foo input" \ "" \ |