gotosocial/vendor/github.com/twitchyliquid64/golang-asm/objabi/path.go
2023-02-25 12:12:40 +00:00

42 lines
1.1 KiB
Go

// Copyright 2017 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 objabi
import "strings"
// PathToPrefix converts raw string to the prefix that will be used in the
// symbol table. All control characters, space, '%' and '"', as well as
// non-7-bit clean bytes turn into %xx. The period needs escaping only in the
// last segment of the path, and it makes for happier users if we escape that as
// little as possible.
func PathToPrefix(s string) string {
slash := strings.LastIndex(s, "/")
// check for chars that need escaping
n := 0
for r := 0; r < len(s); r++ {
if c := s[r]; c <= ' ' || (c == '.' && r > slash) || c == '%' || c == '"' || c >= 0x7F {
n++
}
}
// quick exit
if n == 0 {
return s
}
// escape
const hex = "0123456789abcdef"
p := make([]byte, 0, len(s)+2*n)
for r := 0; r < len(s); r++ {
if c := s[r]; c <= ' ' || (c == '.' && r > slash) || c == '%' || c == '"' || c >= 0x7F {
p = append(p, '%', hex[c>>4], hex[c&0xF])
} else {
p = append(p, c)
}
}
return string(p)
}