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The most portable solution in the world

The portable god will be very happy with us today.

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -273,7 +273,8 @@

 		++s;

 	for (u = 0; isxdigit(c = *s++); u = u*base + val) {

-		val = (isdigit(c)) ? c - '0' :  10 + toupper(c) - 'A';

+		static char letters[] = "0123456789ABCDEF";

+		val = strchr(letters, c) - letters;

 	repeat:

 		if (u <= max/base && u*base <= max - val)

 			continue;