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authorRoland McGrath <roland@gnu.org>1995-03-06 19:57:00 +0000
committerRoland McGrath <roland@gnu.org>1995-03-06 19:57:00 +0000
commit286351153566acc7dcc82834d90e0b8d87dff8be (patch)
treebb5531f838010159e5db6aa57f931eb9b5e167d9 /ctype
parent797fa6204a2f642a84c379033e182863c39bdcef (diff)
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Mon Mar 6 12:34:56 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>cvs/make-3-72-9cvs/make-3-72-11cvs/make-3-72-10
* ctype/ctype.h (_ISbit): New macro, defined dependent on byte order. (_IS* enum): Use _ISbit to produce values.
Diffstat (limited to 'ctype')
-rw-r--r--ctype/ctype.h57
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. */