Bugfix: sed s command couldn't skip initial match.

2 files changed, 2 insertions, 1 deletions

diff --git a/tests/sed.test b/tests/sed.test
index c3928e58..fd3b2057 100755
--- a/tests/sed.test
+++ b/tests/sed.test
@@ -115,6 +115,7 @@ testing 'empty match after nonempty match' "sed -e 's/a*/c/g'" 'cbcncgc' \
 testing 'empty match' "sed -e 's/[^ac]*/A/g'" 'AaAcA' '' 'abcde'
 testing 's///#comment' "sed -e 's/TWO/four/i#comment'" "one\nfour\nthree" \
 	"" "one\ntwo\nthree"
+testing 's///num off end' 'sed -e s/e//2' 'e\n' '' 'e\n'
 
 testing 'N flushes pending a and advances match counter' \
 	"sed -e 'a woo' -e 'N;\$p'" 'woo\none\ntwo\none\ntwo' "" 'one\ntwo'
diff --git a/toys/posix/sed.c b/toys/posix/sed.c
index 9bd05034..d5a4a833 100644
--- a/toys/posix/sed.c
+++ b/toys/posix/sed.c
@@ -443,7 +443,7 @@ static void sed_line(char **pline, long plen)
         // If we're replacing only a specific match, skip if this isn't it
         off = command->sflags>>4;
         if (off && off != ++count) {
-          memcpy(l2+l2used, rline, match[0].rm_eo);
+          if (l2) memcpy(l2+l2used, rline, match[0].rm_eo);
           l2used += match[0].rm_eo;
           rline += match[0].rm_eo;