45 lines
804 B
Go
45 lines
804 B
Go
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package main
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import (
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"flag"
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"fmt"
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"os"
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)
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func fileExists(p string) (bool, error) {
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_, err := os.Stat(p)
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if err == nil { return true, nil }
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if os.IsNotExist(err) { return false, nil }
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return false, err
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}
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func setIn() {
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args := flag.Args()
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if len(args) == 0 {
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fmt.Fprintf(os.Stderr, "no input file\n")
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os.Exit(1)
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} else if len(args) > 1 {
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fmt.Fprintf(os.Stderr, "too many input files (%d), needed 1\n", len(args))
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os.Exit(2)
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}
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in = args[0]
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exists, err := fileExists(in)
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if err != nil {
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fmt.Fprintf(os.Stderr, "could not open file\n\t%s", err.Error())
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os.Exit(3)
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} else if !exists {
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fmt.Fprintf(os.Stderr, "%q does not exist\n", in)
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os.Exit(4)
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}
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}
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func setOut(o string) {
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if o == "" {
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out = "out.rom"
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} else {
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out = o
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}
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}
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