From: Pádraig Brady <P@draigBrady.com>
Date: Tue, 24 Mar 2026 16:35:00 +0000 (+0000)
Subject: cut: optimize -f with -d longer than lines
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7a124eb5852d07e355798e339450d71c695d729f;p=thirdparty%2Fcoreutils.git

cut: optimize -f with -d longer than lines

$ time src/cut.before -f1 -dç sl.in >/dev/null
real	0m0.157s

$ time src/cut.after -f1 -dç sl.in >/dev/null
real	0m0.084s
---

diff --git a/src/cut.c b/src/cut.c
index 3024941577..e3e8d49923 100644
--- a/src/cut.c
+++ b/src/cut.c
@@ -567,6 +567,9 @@ ATTRIBUTE_PURE
 static char *
 find_bytesearch_field_delim (char *buf, size_t len)
 {
+  if (len < delim_length)
+    return NULL;
+
 #if ! __GLIBC__  /* Only S390 has optimized memmem on glibc-2.42  */
   return memmem (buf, len, delim_bytes, delim_length);
 #else