Welcome to the CHICKEN Scheme pasting service

(import scheme
        (chicken base)
        (chicken blob)
        (chicken foreign)
        (chicken file posix)
        srfi-4)

(foreign-declare "#include <unistd.h>")

(define lowrite
    (foreign-lambda
     ssize_t "write" int c-pointer size_t))

(define (test x n)
    (let ((s (lowrite fileno/stdout x n)))
        (print "\n" s)))

(let* ((s "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq")
       (b (string->blob s))
       (v (blob->u8vector b)))
    (test (location s) (string-length s))
    (test (location b) (u8vector-length v))
    (test (location v) (u8vector-length v)))

;; OUTPUT
;; abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq
;; 56
;; abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq
;; 56
;; abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq
;; 56

;; VALGRIND
;; ==1841369== 
;; ==1841369== HEAP SUMMARY:
;; ==1841369==     in use at exit: 1,224,072 bytes in 3,620 blocks
;; ==1841369==   total heap usage: 3,631 allocs, 11 frees, 1,231,446 bytes allocated
;; ==1841369== 
;; ==1841369== LEAK SUMMARY:
;; ==1841369==    definitely lost: 0 bytes in 0 blocks
;; ==1841369==    indirectly lost: 0 bytes in 0 blocks
;; ==1841369==      possibly lost: 0 bytes in 0 blocks
;; ==1841369==    still reachable: 1,224,072 bytes in 3,620 blocks
;; ==1841369==         suppressed: 0 bytes in 0 blocks
;; ==1841369== Rerun with --leak-check=full to see details of leaked memory
;; ==1841369== 
;; ==1841369== For lists of detected and suppressed errors, rerun with: -s
;; ==1841369== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)