54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
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// 12 december 2015
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package ui
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import (
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"unsafe"
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)
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// #include <stdlib.h>
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// // TODO remove when switching to Go 1.7
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// #include <string.h>
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import "C"
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// TODO move this to C.CBytes() when switching to Go 1.7
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// We want Go itself to complain when we're out of memory.
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// The allocators in cgo *should* do this, but there isn't a
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// C.CMalloc(). There *is* a C.CBytes(), however, for transferring
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// binary blobs from Go to C. If we pass this an arbitrary slice
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// of the desired length, we get our C.CMalloc(). Using a slice
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// that's always initialized to zero gives us the ZeroMemory()
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// for free.
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var uimallocBytes = make([]byte, 1024) // 1024 bytes first
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//export uimalloc
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func uimalloc(n C.size_t) unsafe.Pointer {
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if n > C.size_t(len(uimallocBytes)) {
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// TODO round n up to a multiple of a power of 2?
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// for instance 0x1234 bytes -> 0x1800 bytes
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uimallocBytes = make([]byte, n)
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}
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p := C.malloc(n)
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if p == nil {
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panic("out of memory in uimalloc()")
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}
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C.memset(p, 0, n)
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return p
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}
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func freestr(str *C.char) {
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C.free(unsafe.Pointer(str))
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}
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func tobool(b C.int) bool {
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return b != 0
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}
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func frombool(b bool) C.int {
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if b {
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return 1
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}
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return 0
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}
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