diff options
Diffstat (limited to 'ctype/ctype.h')
| -rw-r--r-- | ctype/ctype.h | 57 |
1 files changed, 34 insertions, 23 deletions
diff --git a/ctype/ctype.h b/ctype/ctype.h index 9c97831585..f568ff45a8 100644 --- a/ctype/ctype.h +++ b/ctype/ctype.h @@ -27,39 +27,50 @@ Cambridge, MA 02139, USA. */ __BEGIN_DECLS -/* These are all the characteristics of characters. All the - interdependencies (such as that an alphabetic is an uppercase or a - lowercase) are here. If there get to be more than - (sizeof (unsigned short int) * CHAR_BIT) distinct characteristics, - many things must be changed that use `unsigned short int's. */ +/* These are all the characteristics of characters. + If there get to be more than 16 distinct characteristics, + many things must be changed that use `unsigned short int's. + + The characteristics are stored always in network byte order (big + endian). We define the bit value interpretations here dependent on the + machine's byte order. */ + +#include <endian.h> +#if __BYTE_ORDER == __BIG_ENDIAN +#define _ISbit(bit) (1 << bit) +#else /* __BYTE_ORDER == __LITTLE_ENDIAN */ +#define _ISbit(bit) ((1 << bit) << (bit < 8 ? 8 : -8)) +#endif + enum { - _ISupper = 1 << 0, /* UPPERCASE. */ - _ISlower = 1 << 1, /* lowercase. */ - _ISalpha = 1 << 2, /* Alphabetic. */ - _ISdigit = 1 << 3, /* Numeric. */ - _ISxdigit = 1 << 4, /* Hexadecimal numeric. */ - _ISspace = 1 << 5, /* Whitespace. */ - _ISprint = 1 << 6, /* Printing. */ - _ISgraph = 1 << 7, /* Graphical. */ - _ISblank = 1 << 8, /* Blank (usually SPC and TAB). */ - _IScntrl = 1 << 9, /* Control character. */ - _ISpunct = 1 << 10, /* Punctuation. */ + _ISupper = _ISbit (0), /* UPPERCASE. */ + _ISlower = _ISbit (1), /* lowercase. */ + _ISalpha = _ISbit (2), /* Alphabetic. */ + _ISdigit = _ISbit (3), /* Numeric. */ + _ISxdigit = _ISbit (4), /* Hexadecimal numeric. */ + _ISspace = _ISbit (5), /* Whitespace. */ + _ISprint = _ISbit (6), /* Printing. */ + _ISgraph = _ISbit (7), /* Graphical. */ + _ISblank = _ISbit (8), /* Blank (usually SPC and TAB). */ + _IScntrl = _ISbit (9), /* Control character. */ + _ISpunct = _ISbit (10), /* Punctuation. */ /* The following are defined in POSIX.2 as being combinations of the classes above. */ _ISalnum = _ISalpha | _ISdigit /* Alphanumeric. */ }; -/* These are defined in localeinfo.c. +/* These are defined in ctype-info.c. The declarations here must match those in localeinfo.h. - These point to the second element ([1]) of arrays of size (UCHAR_MAX + 1). - EOF is -1, so [EOF] is the first element of the original array. - ANSI requires that the ctype functions work for `unsigned char' values - and for EOF. The case conversion arrays are of `short int's rather than - `unsigned char's because tolower (EOF) must be EOF, which doesn't fit - into an `unsigned char'. */ + These point into arrays of 384, so they can be indexed by any `unsigned + char' value [0,255]; by EOF (-1); or by any `signed char' value + [-128,-1). ANSI requires that the ctype functions work for `unsigned + char' values and for EOF; we also support negative `signed char' values + for broken old programs. The case conversion arrays are of `short int's + rather than `unsigned char's because tolower (EOF) must be EOF, which + doesn't fit into an `unsigned char'. */ extern __const unsigned short int *__ctype_b; /* Characteristics. */ extern __const short int *__ctype_tolower; /* Case conversions. */ extern __const short int *__ctype_toupper; /* Case conversions. */ |