NetBSD/gnu/dist/libio/dbz/case.h

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extern int cistrncmp();
extern char *rfc822ize();
extern char casemap[];
/* must call cistrncmp before invoking TOLOW... */
#define TOLOW(c) (casemap[(c)+128]) /* see case.c for why 128 */
/* ...but the use of it in CISTREQN is safe without the preliminary call (!) */
/* CISTREQN is an optimised case-insensitive strncmp(a,b,n)==0; n > 0 */
#define CISTREQN(a, b, n) \
(TOLOW((a)[0]) == TOLOW((b)[0]) && cistrncmp(a, b, n) == 0)