#include <string.h> size_t strxfrm(char *s1, const char *s2, size_t max);
This copies characters from s2 to s1, which must be able to
hold max characters. Each character is transformed according to
the locale such that strcmp(s1b, s2b) is just like
strcoll(s1, s2) where s1b and s2b are the
transforms of s1 and s2.
The actual number of bytes required to transform s2, including the
NULL.
ANSI, POSIX
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