[VOL-1349] EPON ONU adapter (package B)
Change-Id: I609ba349c429bc7e87c74b66bb1121841f9caef6
diff --git a/vendor/github.com/pkg/errors/stack.go b/vendor/github.com/pkg/errors/stack.go
new file mode 100644
index 0000000..2874a04
--- /dev/null
+++ b/vendor/github.com/pkg/errors/stack.go
@@ -0,0 +1,147 @@
+package errors
+
+import (
+ "fmt"
+ "io"
+ "path"
+ "runtime"
+ "strings"
+)
+
+// Frame represents a program counter inside a stack frame.
+type Frame uintptr
+
+// pc returns the program counter for this frame;
+// multiple frames may have the same PC value.
+func (f Frame) pc() uintptr { return uintptr(f) - 1 }
+
+// file returns the full path to the file that contains the
+// function for this Frame's pc.
+func (f Frame) file() string {
+ fn := runtime.FuncForPC(f.pc())
+ if fn == nil {
+ return "unknown"
+ }
+ file, _ := fn.FileLine(f.pc())
+ return file
+}
+
+// line returns the line number of source code of the
+// function for this Frame's pc.
+func (f Frame) line() int {
+ fn := runtime.FuncForPC(f.pc())
+ if fn == nil {
+ return 0
+ }
+ _, line := fn.FileLine(f.pc())
+ return line
+}
+
+// Format formats the frame according to the fmt.Formatter interface.
+//
+// %s source file
+// %d source line
+// %n function name
+// %v equivalent to %s:%d
+//
+// Format accepts flags that alter the printing of some verbs, as follows:
+//
+// %+s function name and path of source file relative to the compile time
+// GOPATH separated by \n\t (<funcname>\n\t<path>)
+// %+v equivalent to %+s:%d
+func (f Frame) Format(s fmt.State, verb rune) {
+ switch verb {
+ case 's':
+ switch {
+ case s.Flag('+'):
+ pc := f.pc()
+ fn := runtime.FuncForPC(pc)
+ if fn == nil {
+ io.WriteString(s, "unknown")
+ } else {
+ file, _ := fn.FileLine(pc)
+ fmt.Fprintf(s, "%s\n\t%s", fn.Name(), file)
+ }
+ default:
+ io.WriteString(s, path.Base(f.file()))
+ }
+ case 'd':
+ fmt.Fprintf(s, "%d", f.line())
+ case 'n':
+ name := runtime.FuncForPC(f.pc()).Name()
+ io.WriteString(s, funcname(name))
+ case 'v':
+ f.Format(s, 's')
+ io.WriteString(s, ":")
+ f.Format(s, 'd')
+ }
+}
+
+// StackTrace is stack of Frames from innermost (newest) to outermost (oldest).
+type StackTrace []Frame
+
+// Format formats the stack of Frames according to the fmt.Formatter interface.
+//
+// %s lists source files for each Frame in the stack
+// %v lists the source file and line number for each Frame in the stack
+//
+// Format accepts flags that alter the printing of some verbs, as follows:
+//
+// %+v Prints filename, function, and line number for each Frame in the stack.
+func (st StackTrace) Format(s fmt.State, verb rune) {
+ switch verb {
+ case 'v':
+ switch {
+ case s.Flag('+'):
+ for _, f := range st {
+ fmt.Fprintf(s, "\n%+v", f)
+ }
+ case s.Flag('#'):
+ fmt.Fprintf(s, "%#v", []Frame(st))
+ default:
+ fmt.Fprintf(s, "%v", []Frame(st))
+ }
+ case 's':
+ fmt.Fprintf(s, "%s", []Frame(st))
+ }
+}
+
+// stack represents a stack of program counters.
+type stack []uintptr
+
+func (s *stack) Format(st fmt.State, verb rune) {
+ switch verb {
+ case 'v':
+ switch {
+ case st.Flag('+'):
+ for _, pc := range *s {
+ f := Frame(pc)
+ fmt.Fprintf(st, "\n%+v", f)
+ }
+ }
+ }
+}
+
+func (s *stack) StackTrace() StackTrace {
+ f := make([]Frame, len(*s))
+ for i := 0; i < len(f); i++ {
+ f[i] = Frame((*s)[i])
+ }
+ return f
+}
+
+func callers() *stack {
+ const depth = 32
+ var pcs [depth]uintptr
+ n := runtime.Callers(3, pcs[:])
+ var st stack = pcs[0:n]
+ return &st
+}
+
+// funcname removes the path prefix component of a function's name reported by func.Name().
+func funcname(name string) string {
+ i := strings.LastIndex(name, "/")
+ name = name[i+1:]
+ i = strings.Index(name, ".")
+ return name[i+1:]
+}