diff options
Diffstat (limited to 'findutils')
| -rw-r--r-- | findutils/grep.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/findutils/grep.c b/findutils/grep.c index b8ad1bf8f..a7bc4ca9e 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 } } } |