1 files changed, 135 insertions, 0 deletions
diff --git a/src/cmd/cgo/util.go b/src/cmd/cgo/util.go
new file mode 100644
index 0000000..00d931b
--- /dev/null
+++ b/src/cmd/cgo/util.go
@@ -0,0 +1,135 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"go/token"
+	exec "internal/execabs"
+	"io/ioutil"
+	"os"
+)
+
+// run runs the command argv, feeding in stdin on standard input.
+// It returns the output to standard output and standard error.
+// ok indicates whether the command exited successfully.
+func run(stdin []byte, argv []string) (stdout, stderr []byte, ok bool) {
+	if i := find(argv, "-xc"); i >= 0 && argv[len(argv)-1] == "-" {
+		// Some compilers have trouble with standard input.
+		// Others have trouble with -xc.
+		// Avoid both problems by writing a file with a .c extension.
+		f, err := ioutil.TempFile("", "cgo-gcc-input-")
+		if err != nil {
+			fatalf("%s", err)
+		}
+		name := f.Name()
+		f.Close()
+		if err := ioutil.WriteFile(name+".c", stdin, 0666); err != nil {
+			os.Remove(name)
+			fatalf("%s", err)
+		}
+		defer os.Remove(name)
+		defer os.Remove(name + ".c")
+
+		// Build new argument list without -xc and trailing -.
+		new := append(argv[:i:i], argv[i+1:len(argv)-1]...)
+
+		// Since we are going to write the file to a temporary directory,
+		// we will need to add -I . explicitly to the command line:
+		// any #include "foo" before would have looked in the current
+		// directory as the directory "holding" standard input, but now
+		// the temporary directory holds the input.
+		// We've also run into compilers that reject "-I." but allow "-I", ".",
+		// so be sure to use two arguments.
+		// This matters mainly for people invoking cgo -godefs by hand.
+		new = append(new, "-I", ".")
+
+		// Finish argument list with path to C file.
+		new = append(new, name+".c")
+
+		argv = new
+		stdin = nil
+	}
+
+	p := exec.Command(argv[0], argv[1:]...)
+	p.Stdin = bytes.NewReader(stdin)
+	var bout, berr bytes.Buffer
+	p.Stdout = &bout
+	p.Stderr = &berr
+	// Disable escape codes in clang error messages.
+	p.Env = append(os.Environ(), "TERM=dumb")
+	err := p.Run()
+	if _, ok := err.(*exec.ExitError); err != nil && !ok {
+		fatalf("exec %s: %s", argv[0], err)
+	}
+	ok = p.ProcessState.Success()
+	stdout, stderr = bout.Bytes(), berr.Bytes()
+	return
+}
+
+func find(argv []string, target string) int {
+	for i, arg := range argv {
+		if arg == target {
+			return i
+		}
+	}
+	return -1
+}
+
+func lineno(pos token.Pos) string {
+	return fset.Position(pos).String()
+}
+
+// Die with an error message.
+func fatalf(msg string, args ...interface{}) {
+	// If we've already printed other errors, they might have
+	// caused the fatal condition. Assume they're enough.
+	if nerrors == 0 {
+		fmt.Fprintf(os.Stderr, "cgo: "+msg+"\n", args...)
+	}
+	os.Exit(2)
+}
+
+var nerrors int
+
+func error_(pos token.Pos, msg string, args ...interface{}) {
+	nerrors++
+	if pos.IsValid() {
+		fmt.Fprintf(os.Stderr, "%s: ", fset.Position(pos).String())
+	} else {
+		fmt.Fprintf(os.Stderr, "cgo: ")
+	}
+	fmt.Fprintf(os.Stderr, msg, args...)
+	fmt.Fprintf(os.Stderr, "\n")
+}
+
+// isName reports whether s is a valid C identifier
+func isName(s string) bool {
+	for i, v := range s {
+		if v != '_' && (v < 'A' || v > 'Z') && (v < 'a' || v > 'z') && (v < '0' || v > '9') {
+			return false
+		}
+		if i == 0 && '0' <= v && v <= '9' {
+			return false
+		}
+	}
+	return s != ""
+}
+
+func creat(name string) *os.File {
+	f, err := os.Create(name)
+	if err != nil {
+		fatalf("%s", err)
+	}
+	return f
+}
+
+func slashToUnderscore(c rune) rune {
+	if c == '/' || c == '\\' || c == ':' {
+		c = '_'
+	}
+	return c
+}