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Minor optimization to control character check.

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This commit is contained in:
John McNamara 2020-09-07 10:56:00 +01:00
parent 9e8bc95b45
commit 2ee0b0356c
1 changed files with 2 additions and 1 deletions
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3
src/xmlwriter.c
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@ -234,7 +234,8 @@ uint8_t
lxw_has_control_characters(const char *string)
{
while (string) {
if (*string < 0x20 && *string != 0x0A && *string != 0x09)
/* 0xE0 == 0b11100000 masks values > 0x19 == 0b00011111. */
if (!(*string & 0xE0) && *string != 0x0A && *string != 0x09)
return LXW_TRUE;
string++;