uisspace
Tells if a character is whitespace.
Description
Returns nonzero if `c' is whitespace, that is, carriage return, newline,
form feed, tab, vertical tab, or space. Example:
for (counter = 0; counter < ustrlen(text_string); counter++) {
if (uisspace(ugetat(text_string, counter)))
usetat(text_string, counter, '_');
}
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