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45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
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/* isa.h -- isletter, islower, isupper, flipcase */
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#ifndef __ISA_H__
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#define __ISA_H__
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#define NATIONL 0 /* if 1, interpret [,],\,{,},| as characters P.K. */
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#ifdef islower
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#undef islower
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#endif
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#ifdef isupper
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#undef isupper
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#endif
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#if NATIONL
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#define LASTUL ']'
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#define LASTLL '}'
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#else
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#define LASTUL 'Z'
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#define LASTLL 'z'
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#endif
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#define isletter(c) __isxletter((0xFF & (c)))
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#define islower(c) isxlower((0xFF & (c)))
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#define isupper(c) isxupper((0xFF & (c)))
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#define __isxletter(c) (('a' <= c && LASTLL >= c) || ('A' <= c && LASTUL >= c) || (192<=c /* && c<=255 */))
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#define isxlower(c) (('a' <= c && LASTLL >= c) || (224 <= c && 252 >= c))
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#define isxupper(c) (('A' <= c && LASTUL >= c) || (192 <= c && 220 >= c))
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/* DIFCASE represents the integer difference between upper and lower
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case letters. It is an xor-able value, which is fortunate, since the
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relative positions of upper to lower case letters is the opposite of
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ascii in ebcdic.
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*/
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#define DIFCASE 0x20 /* ASCII 'a' - 'A' */
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#define flipcase( c) ((c) ^ DIFCASE) /* Toggle the case of a letter. */
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#endif /* __ISA_H__ */
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/* end of isa.h */
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