Declaration:
size_t strxfrm(char *str1,
const char *str2, size_t
n);
Transforms the string str2 and places the result into
str1. It copies at most n characters into str1
including the null terminating character. The transformation
occurs such that strcmp applied to two
separate converted strings returns the same value as
strcoll applied to the same two strings. If
overlapping occurs, the result is undefined.
Returns the length of the transformed string (not including
the null character).
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