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XBEL: Fix us-ascii charset lookup.
Previously, print_xml_entities did look up the charset, but did not save the result anywhere and just used 0, leading to further lookups in subsequent calls. It worked by accident though, because the codepage index of us-ascii currently is 0.
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@ -183,9 +183,9 @@ print_xml_entities(struct secure_save_info *ssi, const unsigned char *str)
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|| (x) == '{' || (x) == '%' \
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|| (x) == '+')
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static int cp = 0;
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static int cp = -1;
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if (!cp) get_cp_index("us-ascii");
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if (cp == -1) cp = get_cp_index("us-ascii");
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for (; *str; str++) {
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if (accept_char(*str))
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