https://git.ruby-lang.org/ruby.git/commit/?id=c29c2afafe

From c29c2afafe5bc550090959af24e7fbedd8e002e9 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 23 Oct 2021 12:21:50 +0900
Subject: Refactor setup_narg and extract finish_narg

---
 io.c | 59 +++++++++++++++++++++++++++--------------------------------
 1 file changed, 27 insertions(+), 32 deletions(-)

diff --git a/io.c b/io.c
index da97102b56b..dc883f36b43 100644
--- a/io.c
+++ b/io.c
@@ -10092,7 +10092,7 @@ typedef int fcntl_arg_t; https://github.com/ruby/ruby/blob/trunk/io.c#L10092
 #endif
 
 static long
-fcntl_narg_len(int cmd)
+fcntl_narg_len(ioctl_req_t cmd)
 {
     long len;
 
@@ -10212,19 +10212,21 @@ fcntl_narg_len(int cmd) https://github.com/ruby/ruby/blob/trunk/io.c#L10212
 }
 #else /* HAVE_FCNTL */
 static long
-fcntl_narg_len(int cmd)
+fcntl_narg_len(ioctl_req_t cmd)
 {
     return 0;
 }
 #endif /* HAVE_FCNTL */
 
+#define NARG_SENTINEL 17
+
 static long
-setup_narg(ioctl_req_t cmd, VALUE *argp, int io_p)
+setup_narg(ioctl_req_t cmd, VALUE *argp, long (*narg_len)(ioctl_req_t))
 {
     long narg = 0;
     VALUE arg = *argp;
 
-    if (NIL_P(arg) || arg == Qfalse) {
+    if (!RTEST(arg)) {
 	narg = 0;
     }
     else if (FIXNUM_P(arg)) {
@@ -10244,10 +10246,7 @@ setup_narg(ioctl_req_t cmd, VALUE *argp, int io_p) https://github.com/ruby/ruby/blob/trunk/io.c#L10246
 	    long len, slen;
 
 	    *argp = arg = tmp;
-	    if (io_p)
-		len = ioctl_narg_len(cmd);
-	    else
-		len = fcntl_narg_len((int)cmd);
+	    len = narg_len(cmd);
 	    rb_str_modify(arg);
 
 	    slen = RSTRING_LEN(arg);
@@ -10259,7 +10258,7 @@ setup_narg(ioctl_req_t cmd, VALUE *argp, int io_p) https://github.com/ruby/ruby/blob/trunk/io.c#L10258
 	    }
 	    /* a little sanity check here */
 	    ptr = RSTRING_PTR(arg);
-	    ptr[slen - 1] = 17;
+	    ptr[slen - 1] = NARG_SENTINEL;
 	    narg = (long)(SIGNED_VALUE)ptr;
 	}
     }
@@ -10267,24 +10266,15 @@ setup_narg(ioctl_req_t cmd, VALUE *argp, int io_p) https://github.com/ruby/ruby/blob/trunk/io.c#L10266
     return narg;
 }
 
-#ifdef HAVE_IOCTL
 static VALUE
-rb_ioctl(VALUE io, VALUE req, VALUE arg)
+finish_narg(int retval, VALUE arg, const rb_io_t *fptr)
 {
-    ioctl_req_t cmd = NUM2IOCTLREQ(req);
-    rb_io_t *fptr;
-    long narg;
-    int retval;
-
-    narg = setup_narg(cmd, &arg, 1);
-    GetOpenFile(io, fptr);
-    retval = do_ioctl(fptr->fd, cmd, narg);
     if (retval < 0) rb_sys_fail_path(fptr->pathv);
     if (RB_TYPE_P(arg, T_STRING)) {
 	char *ptr;
 	long slen;
 	RSTRING_GETMEM(arg, ptr, slen);
-	if (ptr[slen-1] != 17)
+	if (ptr[slen-1] != NARG_SENTINEL)
 	    rb_raise(rb_eArgError, "return value overflowed string");
 	ptr[slen-1] = '\0';
     }
@@ -10292,6 +10282,21 @@ rb_ioctl(VALUE io, VALUE req, VALUE arg) https://github.com/ruby/ruby/blob/trunk/io.c#L10282
     return INT2NUM(retval);
 }
 
+#ifdef HAVE_IOCTL
+static VALUE
+rb_ioctl(VALUE io, VALUE req, VALUE arg)
+{
+    ioctl_req_t cmd = NUM2IOCTLREQ(req);
+    rb_io_t *fptr;
+    long narg;
+    int retval;
+
+    narg = setup_narg(cmd, &arg, ioctl_narg_len);
+    GetOpenFile(io, fptr);
+    retval = do_ioctl(fptr->fd, cmd, narg);
+    return finish_narg(retval, arg, fptr);
+}
+
 /*
  *  call-seq:
  *     ios.ioctl(integer_cmd, arg)    -> integer
@@ -10369,20 +10374,10 @@ rb_fcntl(VALUE io, VALUE req, VALUE arg) https://github.com/ruby/ruby/blob/trunk/io.c#L10374
     long narg;
     int retval;
 
-    narg = setup_narg(cmd, &arg, 0);
+    narg = setup_narg(cmd, &arg, fcntl_narg_len);
     GetOpenFile(io, fptr);
     retval = do_fcntl(fptr->fd, cmd, narg);
-    if (retval < 0) rb_sys_fail_path(fptr->pathv);
-    if (RB_TYPE_P(arg, T_STRING)) {
-	char *ptr;
-	long slen;
-	RSTRING_GETMEM(arg, ptr, slen);
-	if (ptr[slen-1] != 17)
-	    rb_raise(rb_eArgError, "return value overflowed string");
-	ptr[slen-1] = '\0';
-    }
-
-    return INT2NUM(retval);
+    return finish_narg(retval, arg, fptr);
 }
 
 /*
-- 
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