38 lines
701 B
Go
38 lines
701 B
Go
package builtins
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import (
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"monkey/internal/object"
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"monkey/internal/typing"
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"syscall"
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)
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// Seek ...
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func Seek(args ...object.Object) object.Object {
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if err := typing.Check(
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"seek", args,
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typing.RangeOfArgs(1, 3),
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typing.WithTypes(object.IntegerType, object.IntegerType, object.IntegerType),
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); err != nil {
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return newError(err.Error())
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}
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var (
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fd int
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whence = 0
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)
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fd = int(args[0].(*object.Integer).Value)
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offset := args[1].(*object.Integer).Value
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if len(args) == 3 {
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whence = int(args[2].(*object.Integer).Value)
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}
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offset, err := syscall.Seek(fd, offset, whence)
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if err != nil {
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return newError("IOError: %s", err)
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}
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return &object.Integer{Value: offset}
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}
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