From 7c5c967fca7c873414b1eed56d662dc4118123dd Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 6 May 2026 18:12:01 +0900
Subject: pathname: Define has_separator? instead of SEPARATOR_PAT

---
 depend              |  2 ++
 pathname.c          | 32 ++++++++++++++++++++++++++++++++
 pathname_builtin.rb |  8 ++++----
 3 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/depend b/depend
index 33249a03be..7faf59f5a4 100644
--- a/depend
+++ b/depend
@@ -11146,6 +11146,7 @@ pathname.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 pathname.$(OBJEXT): $(top_srcdir)/internal/file.h
 pathname.$(OBJEXT): $(top_srcdir)/internal/serial.h
 pathname.$(OBJEXT): $(top_srcdir)/internal/static_assert.h
+pathname.$(OBJEXT): $(top_srcdir)/internal/string.h
 pathname.$(OBJEXT): $(top_srcdir)/internal/vm.h
 pathname.$(OBJEXT): $(top_srcdir)/internal/warnings.h
 pathname.$(OBJEXT): {$(VPATH)}assert.h
@@ -11162,6 +11163,7 @@ pathname.$(OBJEXT): {$(VPATH)}backward/2/stdarg.h
 pathname.$(OBJEXT): {$(VPATH)}builtin.h
 pathname.$(OBJEXT): {$(VPATH)}config.h
 pathname.$(OBJEXT): {$(VPATH)}defines.h
+pathname.$(OBJEXT): {$(VPATH)}encindex.h
 pathname.$(OBJEXT): {$(VPATH)}encoding.h
 pathname.$(OBJEXT): {$(VPATH)}intern.h
 pathname.$(OBJEXT): {$(VPATH)}internal.h
diff --git a/pathname.c b/pathname.c
index e8959bb976..72930ff473 100644
--- a/pathname.c
+++ b/pathname.c
@@ -1,6 +1,7 @@
 #include "ruby.h"
 #include "internal.h"
 #include "internal/file.h"
+#include "internal/string.h"
 #include "internal/vm.h"
 
 #if defined __CYGWIN__ || defined DOSISH
@@ -17,6 +18,14 @@ static VALUE rb_cPathname;
 static ID id_at_path;
 static ID id_sub;
 
+static VALUE
+check_strpath(VALUE path)
+{
+    Check_Type(path, T_STRING);
+    rb_get_path_check_no_convert(path);
+    return path;
+}
+
 static VALUE
 get_strpath(VALUE obj)
 {
@@ -156,6 +165,27 @@ path_absolute_p(VALUE self)
     return RBOOL(isdirsep(ptr[0]));
 }
 
+/* :nodoc: */
+static VALUE
+has_separator_p(VALUE self, VALUE path)
+{
+    const char *ptr = RSTRING_PTR(check_strpath(path));
+    const char *end = RSTRING_END(path);
+    if (alt_separator) {
+        rb_encoding *enc = rb_enc_get(path);
+        bool mb = !rb_str_enc_fastpath(path);
+        while (ptr < end) {
+            if (isdirsep(*ptr)) return Qtrue;
+            ptr += (mb ? rb_enc_mbclen(ptr, end, enc) : 1);
+        }
+    }
+    else {
+        /* assume '/' will never be trailing bytes */
+        if (memchr(ptr, '/', end - ptr)) return Qtrue;
+    }
+    return Qfalse;
+}
+
 #include "pathname_builtin.rbinc"
 
 static void init_ids(void);
@@ -180,6 +210,8 @@ InitVM_pathname(void)
     rb_define_method(rb_cPathname, "root?", path_root_p, 0);
     rb_define_method(rb_cPathname, "absolute?", path_absolute_p, 0);
 
+    rb_define_private_method(rb_cPathname, "has_separator?", has_separator_p, 1);
+
     rb_provide("pathname.so");
 }
 
diff --git a/pathname_builtin.rb b/pathname_builtin.rb
index a38e28de8a..5bab73ea49 100644
--- a/pathname_builtin.rb
+++ b/pathname_builtin.rb
@@ -383,7 +383,7 @@ class Pathname
   def prepend_prefix(prefix, relpath) # :nodoc:
     if relpath.empty?
       File.dirname(prefix)
-    elsif SEPARATOR_PAT.match?(prefix)
+    elsif has_separator?(prefix)
       prefix = File.dirname(prefix)
       prefix = File.join(prefix, "") if File.basename(prefix + 'a') != 'a'
       prefix + relpath
@@ -524,7 +524,7 @@ class Pathname
       end
     end
     pre.tr!(File::ALT_SEPARATOR, File::SEPARATOR) if File::ALT_SEPARATOR
-    if SEPARATOR_PAT.match?(File.basename(pre))
+    if has_separator?(File.basename(pre))
       names.shift while names[0] == '..'
     end
     self.class.new(prepend_prefix(pre, File.join(*names)))
@@ -573,7 +573,7 @@ class Pathname
       names.unshift base if base != '.'
     end
     pre.tr!(File::ALT_SEPARATOR, File::SEPARATOR) if File::ALT_SEPARATOR
-    if SEPARATOR_PAT.match?(File.basename(pre))
+    if has_separator?(File.basename(pre))
       names.shift while names[0] == '..'
     end
     if names.empty?
@@ -800,7 +800,7 @@ class Pathname
       basename_list2.shift
     end
     r1 = chop_basename(prefix1)
-    if !r1 && (r1 = SEPARATOR_PAT.match?(File.basename(prefix1)))
+    if !r1 && (r1 = has_separator?(File.basename(prefix1)))
       while !basename_list2.empty? && basename_list2.first == '..'
         index_list2.shift
         basename_list2.shift
-- 
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