cpython / Include / pyctype.h

#ifndef PYCTYPE_H
#define PYCTYPE_H

#define PY_CTF_LOWER  0x01
#define PY_CTF_UPPER  0x02
#define PY_CTF_DIGIT  0x04
#define PY_CTF_SPACE  0x08
#define PY_CTF_XDIGIT 0x10

extern const unsigned int _Py_ctype_table[256];

#define Py_ISLOWER(c)  (_Py_ctype_table[Py_CHARMASK(c)] & PY_CTF_LOWER)
#define Py_ISUPPER(c)  (_Py_ctype_table[Py_CHARMASK(c)] & PY_CTF_UPPER)
#define Py_ISALPHA(c)  (_Py_ctype_table[Py_CHARMASK(c)] & PY_CTF_ALPHA)
#define Py_ISDIGIT(c)  (_Py_ctype_table[Py_CHARMASK(c)] & PY_CTF_DIGIT)
#define Py_ISXDIGIT(c) (_Py_ctype_table[Py_CHARMASK(c)] & PY_CTF_XDIGIT)
#define Py_ISALNUM(c)  (_Py_ctype_table[Py_CHARMASK(c)] & PY_CTF_ALNUM)
#define Py_ISSPACE(c)  (_Py_ctype_table[Py_CHARMASK(c)] & PY_CTF_SPACE)

extern const unsigned char _Py_ctype_tolower[256];
extern const unsigned char _Py_ctype_toupper[256];

#define Py_TOLOWER(c) (_Py_ctype_tolower[Py_CHARMASK(c)])
#define Py_TOUPPER(c) (_Py_ctype_toupper[Py_CHARMASK(c)])

#endif /* !PYCTYPE_H */
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