Missing strtod

[samoht]

val float_of_string (and the corresponding Scanf function) uses strod (see the relevant OCaml code). However It seems that we do not support it.

[MagnusS]

This currently also means that calls to float_of_string will compile, but crash the unikernel at runtime.

[dbuenzli]

FWIW the algorithms of this paper look interesting. A self-contained BSD3 implementation by the author is available here.

[talex5]

Interesting. A small self-contained implementation of this would be very welcome. Are there any issues with using C++ code in mirage-xen? I guess it will need some support libraries.

[hhugo]

related : http://caml.inria.fr/mantis/view.php?id=6701
(strtod is locale dependent)

[yomimono]

This came up again from a user via cohttp: https://github.com/mirage/ocaml-cohttp/blob/master/lib/accept_parser.mly#L45 .

[timbertson]

I've also hit this with yojson, parsing any JSON data containing a float.

[dbuenzli]

New issue with a reference to a new paper http://caml.inria.fr/mantis/view.php?id=7218

[dbuenzli]

As follow up to the call. The code I'm using in libc-ocaml is this one. It is what used to be used e.g. in V8 before they switched to grisu, here's the removal commit.

[dbuenzli]

Note also that there is a change log here it may be a good idea to mention which version was picked up.

[ansiwen]

same problem here in cohttp in combiation with webmachine: https://bpaste.net/show/607e55d45508

so, will this be fixed? what can we do about it? I need a solution, but I'm not sure how it's going to be fixed. I could help.

[talex5]

@ansiwen Thanks for the offer! Someone needs to pick a suitable-licensed, self-contained, not-too-messy C implementation and copy it into mirage-platform here: https://github.com/mirage/mirage-platform/tree/master/xen-posix/src (next to fmt_fp.c, which does the other direction).