libc-top-half/musl/src/string/strcasestr.c


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#define _GNU_SOURCE
#include <string.h>

char *strcasestr(const char *h, const char *n)
{
	size_t l = strlen(n);
	for (; *h; h++) if (!strncasecmp(h, n, l)) return (char *)h;
	return 0;
}