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Diffstat (limited to 'findutils/grep.c')
-rw-r--r--findutils/grep.c28
1 files changed, 25 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
}
}
}