grep: don't bail out on first mismatch if '-w' option is set

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 20 insertions, 8 deletions

diff --git a/findutils/grep.c b/findutils/grep.c
index 70f3516a5..b808ad92b 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -373,6 +373,8 @@ static int grep_file(FILE *file)
  opt_f_not_found: ;
                                 }
                         } else {
+                                char *match_at;
+
                                 if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
                                         gl->flg_mem_alocated_compiled |= COMPILED;
 #if !ENABLE_EXTRA_COMPAT
@@ -388,32 +390,36 @@ static int grep_file(FILE *file)
                                 gl->matched_range.rm_so = 0;
                                 gl->matched_range.rm_eo = 0;
 #endif
+                                match_at = line;
+ opt_w_again:
                                 if (
 #if !ENABLE_EXTRA_COMPAT
-                                        regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0
+                                        regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, 0) == 0
 #else
-                                        re_search(&gl->compiled_regex, line, line_len,
+                                        re_search(&gl->compiled_regex, match_at, line_len,
                                                         /*start:*/ 0, /*range:*/ line_len,
                                                         &gl->matched_range) >= 0
 #endif
                                 ) {
                                         if (option_mask32 & OPT_x) {
                                                 found = (gl->matched_range.rm_so == 0
-                                                         && line[gl->matched_range.rm_eo] == '\0');
+                                                         && match_at[gl->matched_range.rm_eo] == '\0');
                                         } else
                                         if (!(option_mask32 & OPT_w)) {
                                                 found = 1;
                                         } else {
                                                 char c = ' ';
                                                 if (gl->matched_range.rm_so)
-                                                        c = line[gl->matched_range.rm_so - 1];
+                                                        c = match_at[gl->matched_range.rm_so - 1];
                                                 if (!isalnum(c) && c != '_') {
-                                                        c = line[gl->matched_range.rm_eo];
-                                                        if (!c || (!isalnum(c) && c != '_'))
+                                                        c = match_at[gl->matched_range.rm_eo];
+                                                        if (!c || (!isalnum(c) && c != '_')) {
                                                                 found = 1;
+                                                        } else {
+                                                                match_at += gl->matched_range.rm_eo;
+                                                                goto opt_w_again;
+                                                        }
                                                 }
-//BUG: "echo foop foo | grep -w foo" should match, but doesn't:
-//we bail out on first "mismatch" because it's not a word.
                                         }
                                 }
                         }
diff --git a/testsuite/grep.tests b/testsuite/grep.tests
index 4781f2284..5696fa7e1 100755
--- a/testsuite/grep.tests
+++ b/testsuite/grep.tests
@@ -127,6 +127,12 @@ testing "grep -Fw doesn't stop on 1st mismatch" \
         "foop foo\n" \
         ""
 
+testing "grep -w doesn't stop on 1st mismatch" \
+        "grep -w foo input" \
+        "foop foo\n" \
+        "foop foo\n" \
+        ""
+
 # testing "test name" "commands" "expected result" "file input" "stdin"
 #   file input will be file called "input"
 #   test can create a file "actual" instead of writing to stdout