1 /* Copyright (c) 2002 Red Hat Incorporated.
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions are met:
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10 Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
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15 or promote products derived from this software without specific
16 prior written permission.
18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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20 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 ARE DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
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23 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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32 <<iswalpha>>---alphabetic wide character test
39 int iswalpha(wint_t <[c]>);
47 <<iswalpha>> is a function which classifies wide-character values that
51 <<iswalpha>> returns non-zero if <[c]> is an alphabetic wide character.
56 No supporting OS subroutines are required.
66 #include "utf8alpha.h"
67 #endif /* _MB_CAPABLE */
70 _DEFUN(iswalpha,(c), wint_t c)
73 if (__lc_ctype[0] == 'C' && __lc_ctype[1] == '\0')
79 else if (!strcmp (__lc_ctype, "C-JIS"))
81 c = __jp2uc (c, JP_JIS);
84 else if (!strcmp (__lc_ctype, "C-SJIS"))
86 c = __jp2uc (c, JP_SJIS);
89 else if (!strcmp (__lc_ctype, "C-EUCJP"))
91 c = __jp2uc (c, JP_EUCJP);
94 else if (!strcmp (__lc_ctype, "C-UTF-8"))
101 unsigned const char *table;
107 /* for some large sections, all characters are alphabetic so handle them here */
108 if ((x >= 0x34 && x <= 0x4c) ||
109 (x >= 0x4e && x <= 0x9e) ||
110 (x >= 0xac && x <= 0xd6) ||
111 (x >= 0x200 && x <= 0x2a5))
314 /* we have narrowed down to a section of 256 characters to check */
315 /* now check if c matches the alphabetic wide-chars within that section */
316 ptr = (unsigned char *)table;
317 ctmp = (unsigned char)c;
318 while (ptr < table + size)
324 /* otherwise c > *ptr */
325 /* look for 0x0 as next element which indicates a range */
329 /* we have a range..see if c falls within range */
339 #endif /* _MB_CAPABLE */
341 return (c < (wint_t)0x100 ? isalpha (c) : 0);