A test and fix for the sed 'n' command

2 files changed, 20 insertions, 0 deletions

diff --git a/editors/sed.c b/editors/sed.c
index 00ed20892..8c77a0ffc 100644
--- a/editors/sed.c
+++ b/editors/sed.c
@@ -985,11 +985,19 @@ static void process_file(FILE * file)
                                         next_line = NULL;
                                         break;
                                 case 'n':       /* Read next line from input */
+                                        if (!be_quiet) {
+                                                puts(pattern_space);
+                                        }
                                         if (next_line) {
                                                 free(pattern_space);
                                                 pattern_space = next_line;
                                                 next_line = bb_get_chomped_line_from_file(file);
                                                 linenum++;
+                                        } else {
+                                                /* Jump to end of script and exist */
+                                                deleted = 1;
+                                                free(next_line);
+                                                next_line = NULL;
                                         }
                                         break;
                                 case 'N':       /* Append the next line to the current line */
diff --git a/testsuite/sed/sed-next-line b/testsuite/sed/sed-next-line
new file mode 100644
index 000000000..38fe20cf2
--- /dev/null
+++ b/testsuite/sed/sed-next-line
@@ -0,0 +1,12 @@
+busybox sed 'n;p'>output <<EOF
+a
+b
+c
+EOF
+cmp -s output - <<EOF
+a
+b
+b
+c
+c
+EOF