From 6987ec45b18924e9dcbf1439fe92a2ab7c7fc8bd Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 8 May 2023 16:21:15 +0900
Subject: [ruby/stringio] Drop support for ruby 2.6 or earlier
 (https://github.com/ruby/stringio/pull/47)

`rb_io_extract_modeenc` has been exported since ruby 2.7.
---
 ext/stringio/extconf.rb       |  1 -
 ext/stringio/stringio.c       | 80 -------------------------------------------
 ext/stringio/stringio.gemspec |  3 +-
 3 files changed, 1 insertion(+), 83 deletions(-)

diff --git a/ext/stringio/extconf.rb b/ext/stringio/extconf.rb
index a933159766..ad8650dce2 100644
--- a/ext/stringio/extconf.rb
+++ b/ext/stringio/extconf.rb
@@ -1,4 +1,3 @@
 # frozen_string_literal: false
 require 'mkmf'
-have_func("rb_io_extract_modeenc", "ruby/io.h")
 create_makefile('stringio')
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 99a19ead0d..e69afc31f1 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -32,86 +32,6 @@
 # define rb_class_new_instance_kw(argc, argv, klass, kw_splat) rb_class_new_instance(argc, argv, klass)
 #endif
 
-#ifndef HAVE_RB_IO_EXTRACT_MODEENC
-#define rb_io_extract_modeenc strio_extract_modeenc
-static void
-strio_extract_modeenc(VALUE *vmode_p, VALUE *vperm_p, VALUE opthash,
-		      int *oflags_p, int *fmode_p, struct rb_io_enc_t *convconfig_p)
-{
-    VALUE mode = *vmode_p;
-    VALUE intmode;
-    int fmode;
-    int has_enc = 0, has_vmode = 0;
-
-    convconfig_p->enc = convconfig_p->enc2 = 0;
-
-  vmode_handle:
-    if (NIL_P(mode)) {
-	fmode = FMODE_READABLE;
-    }
-    else if (!NIL_P(intmode = rb_check_to_integer(mode, "to_int"))) {
-	int flags = NUM2INT(intmode);
-	fmode = rb_io_oflags_fmode(flags);
-    }
-    else {
-	const char *m = StringValueCStr(mode), *n, *e;
-	fmode = rb_io_modestr_fmode(m);
-	n = strchr(m, ':');
-	if (n) {
-	    long len;
-	    char encname[ENCODING_MAXNAMELEN+1];
-	    has_enc = 1;
-	    if (fmode & FMODE_SETENC_BY_BOM) {
-		n = strchr(n, '|');
-	    }
-	    e = strchr(++n, ':');
-	    len = e ? e - n : (long)strlen(n);
-	    if (len > 0 && len <= ENCODING_MAXNAMELEN) {
-		rb_encoding *enc;
-		if (e) {
-		    memcpy(encname, n, len);
-		    encname[len] = '\0';
-		    n = encname;
-		}
-		enc = rb_enc_find(n);
-		if (e)
-		    convconfig_p->enc2 = enc;
-		else
-		    convconfig_p->enc = enc;
-	    }
-	    if (e && (len = strlen(++e)) > 0 && len <= ENCODING_MAXNAMELEN) {
-		convconfig_p->enc = rb_enc_find(e);
-	    }
-	}
-    }
-
-    if (!NIL_P(opthash)) {
-	rb_encoding *extenc = 0, *intenc = 0;
-	VALUE v;
-	if (!has_vmode) {
-	    ID id_mode;
-	    CONST_ID(id_mode, "mode");
-	    v = rb_hash_aref(opthash, ID2SYM(id_mode));
-	    if (!NIL_P(v)) {
-		if (!NIL_P(mode)) {
-		    rb_raise(rb_eArgError, "mode specified twice");
-		}
-		has_vmode = 1;
-		mode = v;
-		goto vmode_handle;
-	    }
-	}
-
-	if (rb_io_extract_encoding_option(opthash, &extenc, &intenc, &fmode)) {
-	    if (has_enc) {
-		rb_raise(rb_eArgError, "encoding specified twice");
-	    }
-	}
-    }
-    *fmode_p = fmode;
-}
-#endif
-
 struct StringIO {
     VALUE string;
     rb_encoding *enc;
diff --git a/ext/stringio/stringio.gemspec b/ext/stringio/stringio.gemspec
index 1015d261f5..7d320b3e78 100644
--- a/ext/stringio/stringio.gemspec
+++ b/ext/stringio/stringio.gemspec
@@ -14,7 +14,6 @@ Gem::Specification.new do |s|
   s.name = "stringio"
   s.version = source_version
 
-  s.required_rubygems_version = Gem::Requirement.new(">= 2.6")
   s.require_paths = ["lib"]
   s.authors = ["Nobu Nakada", "Charles Oliver Nutter"]
   s.description = "Pseudo `IO` class from/to `String`."
@@ -30,7 +29,7 @@ Gem::Specification.new do |s|
   end
   s.homepage = "https://github.com/ruby/stringio"
   s.licenses = ["Ruby", "BSD-2-Clause"]
-  s.required_ruby_version = ">= 2.5"
+  s.required_ruby_version = ">= 2.7"
   s.summary = "Pseudo IO on String"
 
   # s.cert_chain  = %w[certs/nobu.pem]
-- 
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