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// SPDX-License-Identifier: Unlicense OR MIT
// +build darwin,ios
package log
/*
#cgo CFLAGS: -Werror -fmodules -fobjc-arc -x objective-c
__attribute__ ((visibility ("hidden"))) void nslog(char *str);
*/
import "C"
import (
"bufio"
"io"
"log"
"unsafe"
_ "gioui.org/app/internal/cocoainit"
)
func init() {
// macOS Console already includes timestamps.
log.SetFlags(log.Flags() &^ log.LstdFlags)
log.SetOutput(newNSLogWriter())
}
func newNSLogWriter() io.Writer {
r, w := io.Pipe()
go func() {
// 1024 is an arbitrary truncation limit, taken from Android's
// log buffer size.
lineBuf := bufio.NewReaderSize(r, 1024)
// The buffer to pass to C, including the terminating '\0'.
buf := make([]byte, lineBuf.Size()+1)
cbuf := (*C.char)(unsafe.Pointer(&buf[0]))
for {
line, _, err := lineBuf.ReadLine()
if err != nil {
break
}
copy(buf, line)
buf[len(line)] = 0
C.nslog(cbuf)
}
}()
return w
}
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