CStruct with bitfields about cyber HOT 4 OPEN

You've set up bindLib correctly, but you called hts_open with 1 arg instead of 2. Since Cyber currently has function overloading by number of params, it say's it's missing a symbol. I'll make the error message more descriptive.

Oh, wow. Thanks for noticing this. Indeed it's working now.

from cyber.

This hasn't been implemented yet but I did check that it's possible with libtcc. It would look something like this in Cyber:

import os 'os'

lib = os.bindLib('./libfoo.so', [
    os.CFunc{ sym: 'getBitStruct', args: [#uint], ret: bitStruct }
    os.CStruct{ fields: [os.CuintBits(1), os.CuintBits(31)], type: bitStruct }
])

object bitStruct:
  flag number
  other number

s = lib.getBitStruct(22)
print s.flag
print s.other

from cyber.

I see. Thanks for the response.
For that example, I also don't mind bitshifting myself. I do have a related question. I was just trying out wrapping htslib. The first function is hts_open with this signature:

htsFile *hts_open(const char *fn, const char *mode);

where htsFile is:

typedef struct htsFile {
    uint32_t is_bin:1, is_write:1, is_be:1, is_cram:1, is_bgzf:1, dummy:27;
    int64_t lineno;
    kstring_t line;
    char *fn, *fn_aux;
    union {
        BGZF *bgzf;
        struct cram_fd *cram;
        struct hFILE *hfile;
    } fp;
    void *state;  // format specific state information
    htsFormat format;
    hts_idx_t *idx;
    const char *fnidx;
    struct sam_hdr_t *bam_header;
    struct hts_filter_t *filter;
} htsFile;

so I'd prefer not to specify that in cyber. In fact it can be completely opaque.
I tried this:

import os 'os'

hts = os.bindLib('libhts.so', [
    os.CFunc{ sym: 'hts_open', args: [#charPtrZ, #charPtrZ], ret: #ptr}
])
print hts

h = hts.hts_open("../htslib/test/range.bam")
print h

but I see:

BindLib53175d61490b23df
panic: Missing method symbol `hts_open` from receiver of type `BindLib53175d61490b23df`.

/home/brentp/src/cyber/bam.cy:8:5 main:
h = hts.hts_open("../htslib/test/range.bam")
    ^

Is there a way to do this without writing a separate shared lib containing a wrapper function that returns a void *?

from cyber.

You've set up bindLib correctly, but you called hts_open with 1 arg instead of 2. Since Cyber currently has function overloading by number of params, it say's it's missing a symbol. I'll make the error message more descriptive.

Is there a way to do this without writing a separate shared lib containing a wrapper function that returns a void *

That's the intended purpose of #ptr, I think it will be renamed to #voidPtr in the near future.

from cyber.