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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2010-08-23 02:39:47 +0200
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2010-08-23 02:39:47 +0200
commit3d8b96d58d74d775e34de8d19a03db5380eb8f2c (patch)
treec836d8788edcc5af94d8782857f70d9aca5b18a1 /findutils
parentb276e418351612341e31da6385edbc3c91d2f6e8 (diff)
downloadbusybox-3d8b96d58d74d775e34de8d19a03db5380eb8f2c.tar.gz
busybox-3d8b96d58d74d775e34de8d19a03db5380eb8f2c.tar.bz2
grep: fix -o match with empty string (suggested by Colin Watson <cjwatson@ubuntu.com>)
function old new delta grep_file 1216 1251 +35 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'findutils')
-rw-r--r--findutils/grep.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/findutils/grep.c b/findutils/grep.c
index 688ea6ab2..024f27609 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -461,15 +461,19 @@ static int grep_file(FILE *file)
if (found)
print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
} else while (1) {
+ unsigned start = gl->matched_range.rm_so;
unsigned end = gl->matched_range.rm_eo;
+ unsigned len = end - start;
char old = line[end];
line[end] = '\0';
- print_line(line + gl->matched_range.rm_so,
- end - gl->matched_range.rm_so,
- linenum, ':');
+ /* Empty match is not printed: try "echo test | grep -o ''" */
+ if (len != 0)
+ print_line(line + start, len, linenum, ':');
if (old == '\0')
break;
line[end] = old;
+ if (len == 0)
+ end++;
#if !ENABLE_EXTRA_COMPAT
if (regexec(&gl->compiled_regex, line + end,
1, &gl->matched_range, REG_NOTBOL) != 0)