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godoc: fix potential index out-of-bounds error

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R=golang-dev, bradfitz, dsymonds
CC=golang-dev
https://golang.org/cl/5683072
This commit is contained in:
Robert Griesemer 2012-02-21 22:50:00 -08:00
parent c2cd0d09c2
commit d74680ea1c
1 changed files with 5 additions and 3 deletions
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8
src/cmd/godoc/mapping.go
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@ -139,14 +139,16 @@ func (m *Mapping) Fprint(w io.Writer) {
}
}
const sep = string(filepath.Separator)
// splitFirst splits a path at the first path separator and returns
// the path's head (the top-most directory specified by the path) and
// its tail (the rest of the path). If there is no path separator,
// splitFirst returns path as head, and the the empty string as tail.
// splitFirst returns path as head, and the empty string as tail.
// Specifically, splitFirst("foo") == splitFirst("foo/").
//
func splitFirst(path string) (head, tail string) {
if i := strings.Index(path, string(filepath.Separator)); i > 0 {
if i := strings.Index(path, sep); i > 0 {
// 0 < i < len(path)
return path[0:i], path[i+1:]
}
@ -179,7 +181,7 @@ func (m *Mapping) ToAbsolute(spath string) string {
func (m *Mapping) ToRelative(fpath string) string {
for _, e := range m.list {
// if fpath has prefix e.path, the next character must be a separator (was issue 3096)
if strings.HasPrefix(fpath, e.path) && fpath[len(e.path)] == filepath.Separator {
if strings.HasPrefix(fpath, e.path+sep) {
spath := filepath.ToSlash(fpath)
// /absolute/prefix/foo -> prefix/foo
return path.Join(e.prefix, spath[len(e.path):]) // Join will remove a trailing '/'