Error on isalnum / toupper / tolower

[bornbygoogle]

Trace result.log :

ft_isalnum: [FAILED] [fail]: your isalnum just doesn't work, REALLY ?! Test code: int i;

    i = -1;
    while (i < 530)
    {
            if (!!ft_isalnum(i) != !!((*__ctype_b_loc ())[(int) ((i))] & (unsigned shortint) _ISalnum))
                    exit(TEST_FAILED);
            i++;
    }
    exit(TEST_SUCCESS);

Diffs:

ft_isascii: [OK] ft_isprint: [OK] ft_toupper: [FAILED] [fail]: your toupper just doesn't work, REALLY ?! Test code: int i;

    i = -100;
    while (i < 530)
    {
            if (ft_toupper(i) != (__extension__ ({ int __res; if (sizeof (i) > 1) { if (__builtin_constant_p (i)) { int __c = (i); __res = __c < -128 || __c > 255 ? __c : (*__ctype_toupper_loc ())[__c]; } else __res = toupper (i); } else __res = (*__ctype_toupper_loc ())[(int) (i)]; __res; })))
            {
                            ;
                    exit(TEST_FAILED);
            }
            i++;
    }
    exit(TEST_SUCCESS);

Diffs: toupper: |156| ft_toupper: |-100| param: (-100)

ft_tolower: [FAILED] [fail]: your tolower just doesn't work, REALLY ?! Test code: int i;

    i = -100;
    while (i < 530)
    {
            if (ft_tolower(i) != (__extension__ ({ int __res; if (sizeof (i) > 1) { if (__builtin_constant_p (i)) { int __c = (i); __res = __c < -128 || __c > 255 ? __c : (*__ctype_tolower_loc ())[__c]; } else __res = tolower (i); } else __res = (*__ctype_tolower_loc ())[(int) (i)]; __res; })))
            {
                            ;
                    exit(TEST_FAILED);
            }
            i++;
    }
    exit(TEST_SUCCESS);

Diffs: tolower: |156| ft_tolower: |-68| param: (-100)

Mais pourtant, mon code est sure :

par exemple : fonction tolower

int ft_tolower(int c) { return ((c >= 'A' && c <= 'Z') ? (c) : (c + 32)); }

C'est possible de vérifier et confirmer si l'erreur est normale ?

Merci. Cordialement.