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1 /* uprf.c - "unsigned" lexical prefix */
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2 #ifndef lint
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12
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3 static char ident[] = "@(#)$Id: uprf.c,v 1.1.1.1 2005/04/18 14:46:06 kono Exp $";
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0
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4 #endif /* lint */
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5
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6 #define TO_LOWER 040
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7 #define NO_MASK 000
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8 #include <ctype.h>
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9
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10 uprf (c1, c2)
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11 register char *c1,
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12 *c2;
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13 {
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14 register int c,
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15 mask;
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16
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17 if (c1 == 0 || c2 == 0)
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18 return(0); /* XXX */
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19
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20 while (c = *c2++)
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21 {
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22 #ifdef LOCALE
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23 c &= 0xff;
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24 mask = *c1 & 0xff;
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25 c = (isalpha(c) && isupper(c)) ? tolower(c) : c;
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26 mask = (isalpha(mask) && isupper(mask)) ? tolower(mask) : mask;
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27 if (c != mask)
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28 #else
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29 mask = (isalpha(c) && isalpha(*c1)) ? TO_LOWER : NO_MASK;
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30 if ((c | mask) != (*c1 | mask))
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31 #endif
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32 return 0;
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33 else
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34 c1++;
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35 }
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36 return 1;
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37 }
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