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Honor sys.int_max_str_digits in native json.loads by Federicorao · Pull Request #8087 · RustPython/RustPython · GitHub

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Honor sys.int_max_str_digits in native json.loads #8087

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Honor sys.int_max_str_digits in native json.loads #8087

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16679d3
Honor int_max_str_digits in native JSON scanner
Federicorao Jun 12, 2026
2707f54
Fix JSON int limit CI failures
Federicorao Jun 18, 2026
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12 changes: 8 additions & 4 deletions crates/stdlib/src/json.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,12 +9,11 @@ mod _json {
builtins::{PyBaseExceptionRef, PyStrRef, PyType},
convert::ToPyResult,
function::{IntoFuncArgs, OptionalArg},
protocol::PyIterReturn,
protocol::{handle_bytes_to_int_err, PyIterReturn},
types::{Callable, Constructor},
};
use core::str::FromStr;
use malachite_bigint::BigInt;
use rustpython_common::wtf8::Wtf8Buf;
use rustpython_common::{int::bytes_to_int, wtf8::Wtf8Buf};
use std::collections::HashMap;

/// Skip JSON whitespace characters (space, tab, newline, carriage return).
Expand Down Expand Up @@ -243,7 +242,12 @@ mod _json {
} else if let Some(ref parse_int) = self.parse_int {
parse_int.call((buf,), vm)
} else {
Ok(vm.new_pyobj(BigInt::from_str(buf).unwrap()))
bytes_to_int(buf.as_bytes(), 10, vm.state.int_max_str_digits.load())
.map(|value| vm.new_pyobj(value))
.map_err(|e| {
let obj = vm.ctx.new_str(buf);
handle_bytes_to_int_err(e, obj.as_object(), vm)
})
};
Some((ret, buf.len()))
}
Expand Down
13 changes: 13 additions & 0 deletions extra_tests/snippets/stdlib_json.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import json
import sys
from io import BytesIO, StringIO

from testutils import assert_raises
Expand Down Expand Up @@ -261,3 +262,15 @@ def assert_no_native_stack_overflow(func):
assert e.pos == 5, f"expected pos=5, got {e.pos}"
else:
raise AssertionError("expected JSONDecodeError")

# Test that json.loads honors sys.int_max_str_digits
_min_limit = sys.int_info.str_digits_check_threshold
_orig_limit = sys.get_int_max_str_digits()
try:
sys.set_int_max_str_digits(_min_limit)
with assert_raises(ValueError):
json.loads("1" * (_min_limit + 1))
assert json.loads("1" * _min_limit) == int("1" * _min_limit)
assert json.loads('42') == 42
finally:
sys.set_int_max_str_digits(_orig_limit)
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