string-copy! - copy from a string into another string
(import (scheme base)) ;R7RS
(string-copy! to at from)
(string-copy! to at from start)
(string-copy! to at from start end)
Copies the characters of the string
to the string
The order in which characters are copied is unspecified, except that
if the source and destination overlap, copying takes place as if the
source is first copied into a temporary string and then into the
destination. This can be achieved without allocating storage by making
sure to copy in the correct direction in such circumstances.
Returns an unspecified value.
(define a "12345")
(define b (string-copy "abcde"))
(string-copy! b 1 a 0 2)
b => "a12de"
This procedure is unique to R7RS.
It is an error if
is less than zero or greater than the length
It is also an error if
(- (string-length to) at)
is less than
(- end start).
It is also an error if the wrong number arguments was passed or an
argument was outside its domain.
Implementations may signal an error, extend the procedure's
domain of definition to include such arguments,
or fail catastrophically.
This procedure first appeared in R7RS. In R2RS there were the
that had the same effect.
This page is part of the
It includes materials from the RnRS documents.
More information can be found at
Markup created by unroff 1.0sc, March 04, 2023.