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py/parsenum: Fix parsing LLONG_MIN in longlong configuration.

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Re-organize `mp_parse_num_integer()` (for longlong) slightly so that the
most negative 64-bit integer can be parsed.

Fixes issue #17932.

Signed-off-by: Jeff Epler <jepler@gmail.com>
This commit is contained in:
Jeff Epler 2025-08-15 08:47:39 -05:00 committed by Damien George
parent f4f7fbf3dc
commit 1671977ca4
3 changed files with 15 additions and 4 deletions
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2
py/objint.c
View file

@ -247,7 +247,7 @@ char *mp_obj_int_formatted(char **buf, size_t *buf_size, size_t *fmt_size, mp_co
char sign = '\0';
if (num < 0) {
num = -num;
num = -(fmt_uint_t)num;
sign = '-';
}

9
py/parsenum.c
View file

@ -64,7 +64,7 @@ typedef mp_int_t parsed_int_t;
typedef unsigned long long parsed_int_t;
#define PARSED_INT_MUL_OVERFLOW mp_mul_ull_overflow
#define PARSED_INT_FITS(I) ((I) <= (unsigned long long)LLONG_MAX)
#define PARSED_INT_FITS(I) ((I) <= (unsigned long long)LLONG_MAX + 1)
#endif
mp_obj_t mp_parse_num_integer(const char *restrict str_, size_t len, int base, mp_lexer_t *lex) {
@ -135,8 +135,11 @@ mp_obj_t mp_parse_num_integer(const char *restrict str_, size_t len, int base, m
have_ret_val:
#else
// The PARSED_INT_FITS check above ensures parsed_val won't overflow signed long long
long long signed_val = parsed_val;
if (neg) {
long long signed_val = -parsed_val;
if (!neg) {
if (signed_val == LLONG_MIN) {
goto overflow;
}
signed_val = -signed_val;
}
ret_val = mp_obj_new_int_from_ll(signed_val); // Could be large or small int

8
tests/basics/int_64_basics.py
View file

@ -151,3 +151,11 @@ try:
print((1 << 48) << -6)
except ValueError as e:
print(e)
# Test that the most extreme 64 bit integer values all parse with int()
print(int("-9223372036854775807"))
print(int("-9223372036854775808"))
print(int("9223372036854775807"))
# Test that the most negative 64 bit integer can be formed via arithmetic
print(-9223372036854775807-1)