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Avoid undefined behavior when char is signed.
diff -ur xpdfopen-0.86.orig/sendx.c xpdfopen-0.86/sendx.c
--- xpdfopen-0.86.orig/sendx.c 2012-01-28 01:39:39.000000000 +0100
+++ xpdfopen-0.86/sendx.c 2014-06-18 08:13:50.000000000 +0200
@@ -229,7 +229,7 @@
*/
if (ks < 256)
{
- event.state = isupper((char)ks);
+ event.state = isupper((unsigned char)ks);
switch (ks)
{
case 0x08:
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