Defined in header <stdlib.h>
Defined in header <ctype.h>
Defined in header <wctype.h>
Defined in header <string.h>
Defined in header <inttypes.h>
A null-terminated multibyte string (NTMBS), or "multibyte string", is a sequence of nonzero bytes followed by a byte with value zero (the terminating null character).
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