[3.14] Remove dead stores to 'size' in UTF-8 decoder (unicodeobject.c) (GH-140637) (#140658)

miss-islington · ashm-dev · web-flow · commit 97c59f9d61f2 · 2025-10-27T09:21:43.000Z
Remove dead stores to 'size' in UTF-8 decoder (unicodeobject.c) (GH-140637) (cherry picked from commit 7d70a14) Co-authored-by: Shamil <ashm.tech@proton.me>
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
@@ -5497,7 +5497,6 @@ unicode_decode_utf8(const char *s, Py_ssize_t size,
     if (maxchr <= 255) {
         memcpy(PyUnicode_1BYTE_DATA(u), s, pos);
         s += pos;
-        size -= pos;
         writer.pos = pos;
     }
 
@@ -5545,7 +5544,6 @@ unicode_decode_utf8_writer(_PyUnicodeWriter *writer,
             return 0;
         }
         s += decoded;
-        size -= decoded;
     }
 
     return unicode_decode_utf8_impl(writer, starts, s, end,

Original file line number	Diff line number	Diff line change
`@@ -5497,7 +5497,6 @@ unicode_decode_utf8(const char *s, Py_ssize_t size,`
`5497`	`5497`	`if (maxchr <= 255) {`
`5498`	`5498`	`memcpy(PyUnicode_1BYTE_DATA(u), s, pos);`
`5499`	`5499`	`s += pos;`
`5500`		`- size -= pos;`
`5501`	`5500`	`writer.pos = pos;`
`5502`	`5501`	`}`
`5503`	`5502`
`@@ -5545,7 +5544,6 @@ unicode_decode_utf8_writer(_PyUnicodeWriter *writer,`
`5545`	`5544`	`return 0;`
`5546`	`5545`	`}`
`5547`	`5546`	`s += decoded;`
`5548`		`- size -= decoded;`
`5549`	`5547`	`}`
`5550`	`5548`
`5551`	`5549`	`return unicode_decode_utf8_impl(writer, starts, s, end,`