cut: don't print empty lines with '-s' option

A command like 'cut -f1 -s' would print empty lines even though
they don't contain a delimiter.

Add a test to avoid this.

Based on a submission to the upstream mailing list:

   http://lists.busybox.net/pipermail/busybox/2024-July/090834.html

Adds 32 bytes in 32-bit build, saves 32 in 64-bit.

(GitHub issue #459)

1 files changed, 5 insertions, 0 deletions

diff --git a/coreutils/cut.c b/coreutils/cut.c
index d129f9b9d..067e69b12 100644
--- a/coreutils/cut.c
+++ b/coreutils/cut.c
@@ -152,6 +152,11 @@ static void cut_file(FILE *file, const char *delim, const char *odelim,
                         unsigned uu = 0, start = 0, end = 0, out = 0;
                         int dcount = 0;
 
+#if ENABLE_PLATFORM_MINGW32
+                        /* An empty line can't contain a delimiter */
+                        if (linelen == 0 && (option_mask32 & CUT_OPT_SUPPRESS_FLGS))
+                                goto next_line;
+#endif
                         /* Loop through bytes, finding next delimiter */
                         for (;;) {
                                 /* End of current range? */