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Source file src/bytes/bytes_generic.go

Documentation: bytes

  // Copyright 2015 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.
  
  // +build !amd64,!s390x
  
  package bytes
  
  // TODO: implements short string optimization on non amd64 platforms
  // and get rid of bytes_amd64.go
  
  // Index returns the index of the first instance of sep in s, or -1 if sep is not present in s.
  func Index(s, sep []byte) int {
  	n := len(sep)
  	if n == 0 {
  		return 0
  	}
  	if n > len(s) {
  		return -1
  	}
  	c := sep[0]
  	if n == 1 {
  		return IndexByte(s, c)
  	}
  	i := 0
  	t := s[:len(s)-n+1]
  	for i < len(t) {
  		if t[i] != c {
  			o := IndexByte(t[i:], c)
  			if o < 0 {
  				break
  			}
  			i += o
  		}
  		if Equal(s[i:i+n], sep) {
  			return i
  		}
  		i++
  	}
  	return -1
  }
  
  // Count counts the number of non-overlapping instances of sep in s.
  // If sep is an empty slice, Count returns 1 + the number of Unicode code points in s.
  func Count(s, sep []byte) int {
  	return countGeneric(s, sep)
  }
  

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