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cmd/cgo: could we add a C.CBytes function? #14838

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jbardin opened this issue Mar 16, 2016 · 4 comments
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cmd/cgo: could we add a C.CBytes function? #14838

jbardin opened this issue Mar 16, 2016 · 4 comments
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@jbardin
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jbardin commented Mar 16, 2016

Would it be possible to add func C.Cbytes([]byte) unsafe.Pointer to the cgo package?

I have copied the C.CString function, minus the added 0 byte a couple times, and this seems like it could be a useful addition. Granted it's only 3 lines to do the malloc and copy, but this would also serve as documentation for users needing to copy data into C.
@ianlancetaylor ianlancetaylor added this to the Unplanned milestone Mar 16, 2016
@ianlancetaylor
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Want to send in a CL?

@jbardin
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jbardin commented Mar 16, 2016

Sure, though I'm not quite as sure what to do with the cPrologGccgo. Should I use __go_open_array? Something like this:

void *_cgoPREFIX_Cfunc_CBytes(struct __go_open_array b) {
    char *p = malloc(b.__count);
    memmove(p, b.__data, b.__count);
    return p;
}

@ianlancetaylor
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Yes.

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CL https://golang.org/cl/20762 mentions this issue.

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