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authorDenys Vlasenko <vda.linux@googlemail.com>2014-01-07 13:57:42 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2014-01-07 13:59:30 (GMT)
commitcd55f2d9332489432ba2b3093903949c6c2e3e33 (patch)
tree448769abf7fbdd41af7f74d75ecad91c5714b89e
parent432fbd7a1a71ab5a91a8cfab57fad74fda9389bb (diff)
downloadbusybox-cd55f2d9332489432ba2b3093903949c6c2e3e33.tar.gz
busybox-cd55f2d9332489432ba2b3093903949c6c2e3e33.tar.bz2
grep: fix two bugs with -w
Unfortunately, with !EXTRA_COMPAT, "grep -w ^str" still erroneously matches "strstr". function old new delta grep_file 1499 1510 +11 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--findutils/grep.c28
-rwxr-xr-xtestsuite/grep.tests12
2 files changed, 37 insertions, 3 deletions
diff --git a/findutils/grep.c b/findutils/grep.c
index b8ad1bf..a7bc4ca 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -373,6 +373,9 @@ static int grep_file(FILE *file)
opt_f_not_found: ;
}
} else {
+#if ENABLE_EXTRA_COMPAT
+ unsigned start_pos;
+#endif
char *match_at;
if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
@@ -389,15 +392,18 @@ static int grep_file(FILE *file)
#if !ENABLE_EXTRA_COMPAT
gl->matched_range.rm_so = 0;
gl->matched_range.rm_eo = 0;
+#else
+ start_pos = 0;
#endif
match_at = line;
opt_w_again:
+//bb_error_msg("'%s' start_pos:%d line_len:%d", match_at, start_pos, line_len);
if (
#if !ENABLE_EXTRA_COMPAT
regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, 0) == 0
#else
re_search(&gl->compiled_regex, match_at, line_len,
- /*start:*/ 0, /*range:*/ line_len,
+ start_pos, /*range:*/ line_len,
&gl->matched_range) >= 0
#endif
) {
@@ -416,8 +422,24 @@ static int grep_file(FILE *file)
if (!c || (!isalnum(c) && c != '_')) {
found = 1;
} else {
- match_at += gl->matched_range.rm_eo;
- goto opt_w_again;
+ /*
+ * Why check gl->matched_range.rm_eo?
+ * Zero-length match makes -w skip the line:
+ * "echo foo | grep ^" prints "foo",
+ * "echo foo | grep -w ^" prints nothing.
+ * Without such check, we can loop forever.
+ */
+#if !ENABLE_EXTRA_COMPAT
+ if (gl->matched_range.rm_eo != 0) {
+ match_at += gl->matched_range.rm_eo;
+ goto opt_w_again;
+ }
+#else
+ if (gl->matched_range.rm_eo > start_pos) {
+ start_pos = gl->matched_range.rm_eo;
+ goto opt_w_again;
+ }
+#endif
}
}
}
diff --git a/testsuite/grep.tests b/testsuite/grep.tests
index 64d99a9..412efff 100755
--- a/testsuite/grep.tests
+++ b/testsuite/grep.tests
@@ -147,6 +147,18 @@ testing "grep -w doesn't stop on 1st mismatch" \
"foop foo\n" \
""
+testing "grep -w ^str doesn't match str not at the beginning" \
+ "grep -w ^str input" \
+ "" \
+ "strstr\n" \
+ ""
+
+testing "grep -w ^ doesn't hang" \
+ "grep -w ^ input" \
+ "" \
+ "anything\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