all: use strings.IndexByte instead of Index where possible

R=golang-dev, khr
CC=golang-dev
https://golang.org/cl/12486043

src/pkg/crypto/x509/pem_decrypt.go

@@ -115,7 +115,7 @@ func DecryptPEMBlock(b *pem.Block, password []byte) ([]byte, error) {
 		return nil, errors.New("x509: no DEK-Info header in block")
 	}
 
-	idx := strings.Index(dek, ",")
+	idx := strings.IndexByte(dek, ',')
 	if idx == -1 {
 		return nil, errors.New("x509: malformed DEK-Info header")
 	}

src/pkg/debug/gosym/symtab.go

@@ -40,7 +40,7 @@ func (s *Sym) Static() bool { return s.Type >= 'a' }
 // PackageName returns the package part of the symbol name,
 // or the empty string if there is none.
 func (s *Sym) PackageName() string {
-	if i := strings.Index(s.Name, "."); i != -1 {
+	if i := strings.IndexByte(s.Name, '.'); i != -1 {
 		return s.Name[0:i]
 	}
 	return ""
@@ -49,7 +49,7 @@ func (s *Sym) PackageName() string {
 // ReceiverName returns the receiver type name of this symbol,
 // or the empty string if there is none.
 func (s *Sym) ReceiverName() string {
-	l := strings.Index(s.Name, ".")
+	l := strings.IndexByte(s.Name, '.')
 	r := strings.LastIndex(s.Name, ".")
 	if l == -1 || r == -1 || l == r {
 		return ""

src/pkg/encoding/json/tags.go

@@ -15,7 +15,7 @@ type tagOptions string
 // parseTag splits a struct field's json tag into its name and
 // comma-separated options.
 func parseTag(tag string) (string, tagOptions) {
-	if idx := strings.Index(tag, ","); idx != -1 {
+	if idx := strings.IndexByte(tag, ','); idx != -1 {
 		return tag[:idx], tagOptions(tag[idx+1:])
 	}
 	return tag, tagOptions("")
@@ -31,7 +31,7 @@ func (o tagOptions) Contains(optionName string) bool {
 	s := string(o)
 	for s != "" {
 		var next string
-		i := strings.Index(s, ",")
+		i := strings.IndexByte(s, ',')
 		if i >= 0 {
 			s, next = s[:i], s[i+1:]
 		}

src/pkg/encoding/xml/typeinfo.go

@@ -113,7 +113,7 @@ func structFieldInfo(typ reflect.Type, f *reflect.StructField) (*fieldInfo, erro
 
 	// Split the tag from the xml namespace if necessary.
 	tag := f.Tag.Get("xml")
-	if i := strings.Index(tag, " "); i >= 0 {
+	if i := strings.IndexByte(tag, ' '); i >= 0 {
 		finfo.xmlns, tag = tag[:i], tag[i+1:]
 	}
 

src/pkg/encoding/xml/xml.go

@@ -1026,7 +1026,7 @@ func (d *Decoder) nsname() (name Name, ok bool) {
 	if !ok {
 		return
 	}
-	i := strings.Index(s, ":")
+	i := strings.IndexByte(s, ':')
 	if i < 0 {
 		name.Local = s
 	} else {

src/pkg/go/build/build.go

@@ -877,7 +877,7 @@ func (ctxt *Context) saveCgo(filename string, di *Package, cg *ast.CommentGroup)
 
 		// Split at colon.
 		line = strings.TrimSpace(line[4:])
-		i := strings.Index(line, ":")
+		i := strings.IndexByte(line, ':')
 		if i < 0 {
 			return fmt.Errorf("%s: invalid #cgo line: %s", filename, orig)
 		}
@@ -1022,7 +1022,7 @@ func (ctxt *Context) match(name string) bool {
 	if name == "" {
 		return false
 	}
-	if i := strings.Index(name, ","); i >= 0 {
+	if i := strings.IndexByte(name, ','); i >= 0 {
 		// comma-separated list
 		return ctxt.match(name[:i]) && ctxt.match(name[i+1:])
 	}
@@ -1076,7 +1076,7 @@ func (ctxt *Context) match(name string) bool {
 //     name_$(GOOS)_$(GOARCH)_test.*
 //
 func (ctxt *Context) goodOSArchFile(name string) bool {
-	if dot := strings.Index(name, "."); dot != -1 {
+	if dot := strings.IndexByte(name, '.'); dot != -1 {
 		name = name[:dot]
 	}
 	l := strings.Split(name, "_")

src/pkg/go/printer/printer.go

@@ -474,7 +474,7 @@ func stripCommonPrefix(lines []string) {
 	 * Check for vertical "line of stars" and correct prefix accordingly.
 	 */
 	lineOfStars := false
-	if i := strings.Index(prefix, "*"); i >= 0 {
+	if i := strings.IndexByte(prefix, '*'); i >= 0 {
 		// Line of stars present.
 		if i > 0 && prefix[i-1] == ' ' {
 			i-- // remove trailing blank from prefix so stars remain aligned

src/pkg/math/big/rat.go

@@ -429,7 +429,7 @@ func (z *Rat) SetString(s string) (*Rat, bool) {
 	}
 
 	// check for a quotient
-	sep := strings.Index(s, "/")
+	sep := strings.IndexByte(s, '/')
 	if sep >= 0 {
 		if _, ok := z.a.SetString(s[0:sep], 10); !ok {
 			return nil, false
@@ -443,7 +443,7 @@ func (z *Rat) SetString(s string) (*Rat, bool) {
 	}
 
 	// check for a decimal point
-	sep = strings.Index(s, ".")
+	sep = strings.IndexByte(s, '.')
 	// check for an exponent
 	e := strings.IndexAny(s, "eE")
 	var exp Int

src/pkg/mime/mediatype.go

@@ -18,7 +18,7 @@ import (
 // When any of the arguments result in a standard violation then
 // FormatMediaType returns the empty string.
 func FormatMediaType(t string, param map[string]string) string {
-	slash := strings.Index(t, "/")
+	slash := strings.IndexByte(t, '/')
 	if slash == -1 {
 		return ""
 	}
@@ -91,7 +91,7 @@ func checkMediaTypeDisposition(s string) error {
 // The returned map, params, maps from the lowercase
 // attribute to the attribute value with its case preserved.
 func ParseMediaType(v string) (mediatype string, params map[string]string, err error) {
-	i := strings.Index(v, ";")
+	i := strings.IndexByte(v, ';')
 	if i == -1 {
 		i = len(v)
 	}
@@ -127,7 +127,7 @@ func ParseMediaType(v string) (mediatype string, params map[string]string, err e
 		}
 
 		pmap := params
-		if idx := strings.Index(key, "*"); idx != -1 {
+		if idx := strings.IndexByte(key, '*'); idx != -1 {
 			baseName := key[:idx]
 			if continuation == nil {
 				continuation = make(map[string]map[string]string)

src/pkg/net/http/cgi/child.go

@@ -40,7 +40,7 @@ func Request() (*http.Request, error) {
 func envMap(env []string) map[string]string {
 	m := make(map[string]string)
 	for _, kv := range env {
-		if idx := strings.Index(kv, "="); idx != -1 {
+		if idx := strings.IndexByte(kv, '='); idx != -1 {
 			m[kv[:idx]] = kv[idx+1:]
 		}
 	}

src/pkg/net/http/cookie.go

@@ -47,7 +47,7 @@ func readSetCookies(h Header) []*Cookie {
 			continue
 		}
 		parts[0] = strings.TrimSpace(parts[0])
-		j := strings.Index(parts[0], "=")
+		j := strings.IndexByte(parts[0], '=')
 		if j < 0 {
 			continue
 		}
@@ -71,7 +71,7 @@ func readSetCookies(h Header) []*Cookie {
 			}
 
 			attr, val := parts[i], ""
-			if j := strings.Index(attr, "="); j >= 0 {
+			if j := strings.IndexByte(attr, '='); j >= 0 {
 				attr, val = attr[:j], attr[j+1:]
 			}
 			lowerAttr := strings.ToLower(attr)
@@ -188,7 +188,7 @@ func readCookies(h Header, filter string) []*Cookie {
 				continue
 			}
 			name, val := parts[i], ""
-			if j := strings.Index(name, "="); j >= 0 {
+			if j := strings.IndexByte(name, '='); j >= 0 {
 				name, val = name[:j], name[j+1:]
 			}
 			if !isCookieNameValid(name) {

src/pkg/net/http/fs.go

@@ -467,7 +467,7 @@ func parseRange(s string, size int64) ([]httpRange, error) {
 		if ra == "" {
 			continue
 		}
-		i := strings.Index(ra, "-")
+		i := strings.IndexByte(ra, '-')
 		if i < 0 {
 			return nil, errors.New("invalid range")
 		}

src/pkg/net/http/request.go

@@ -408,7 +408,7 @@ func ParseHTTPVersion(vers string) (major, minor int, ok bool) {
 	if !strings.HasPrefix(vers, "HTTP/") {
 		return 0, 0, false
 	}
-	dot := strings.Index(vers, ".")
+	dot := strings.IndexByte(vers, '.')
 	if dot < 0 {
 		return 0, 0, false
 	}
@@ -473,8 +473,8 @@ func (r *Request) SetBasicAuth(username, password string) {
 
 // parseRequestLine parses "GET /foo HTTP/1.1" into its three parts.
 func parseRequestLine(line string) (method, requestURI, proto string, ok bool) {
-	s1 := strings.Index(line, " ")
-	s2 := strings.Index(line[s1+1:], " ")
+	s1 := strings.IndexByte(line, ' ')
+	s2 := strings.IndexByte(line[s1+1:], ' ')
 	if s1 < 0 || s2 < 0 {
 		return
 	}

src/pkg/net/http/server.go

@@ -1262,7 +1262,7 @@ func Redirect(w ResponseWriter, r *Request, urlStr string, code int) {
 			}
 
 			var query string
-			if i := strings.Index(urlStr, "?"); i != -1 {
+			if i := strings.IndexByte(urlStr, '?'); i != -1 {
 				urlStr, query = urlStr[:i], urlStr[i:]
 			}
 
@@ -1494,7 +1494,7 @@ func (mux *ServeMux) Handle(pattern string, handler Handler) {
 		if pattern[0] != '/' {
 			// In pattern, at least the last character is a '/', so
 			// strings.Index can't be -1.
-			path = pattern[strings.Index(pattern, "/"):]
+			path = pattern[strings.IndexByte(pattern, '/'):]
 		}
 		mux.m[pattern[0:n-1]] = muxEntry{h: RedirectHandler(path, StatusMovedPermanently), pattern: pattern}
 	}

src/pkg/net/url/url.go

@@ -421,7 +421,7 @@ func parseAuthority(authority string) (user *Userinfo, host string, err error) {
 		return
 	}
 	userinfo, host := authority[:i], authority[i+1:]
-	if strings.Index(userinfo, ":") < 0 {
+	if strings.IndexByte(userinfo, ':') < 0 {
 		if userinfo, err = unescape(userinfo, encodeUserPassword); err != nil {
 			return
 		}
@@ -536,7 +536,7 @@ func parseQuery(m Values, query string) (err error) {
 			continue
 		}
 		value := ""
-		if i := strings.Index(key, "="); i >= 0 {
+		if i := strings.IndexByte(key, '='); i >= 0 {
 			key, value = key[:i], key[i+1:]
 		}
 		key, err1 := QueryUnescape(key)

src/pkg/os/os_test.go

@@ -890,7 +890,7 @@ func TestHostname(t *testing.T) {
 	}
 	want := run(t, []string{"/bin/hostname"})
 	if hostname != want {
-		i := strings.Index(hostname, ".")
+		i := strings.IndexByte(hostname, '.')
 		if i < 0 || hostname[0:i] != want {
 			t.Errorf("Hostname() = %q, want %q", hostname, want)
 		}

src/pkg/os/user/lookup_unix.go

@@ -105,7 +105,7 @@ func lookupUnix(uid int, username string, lookupByName bool) (*User, error) {
 	// say: "It is expected to be a comma separated list of
 	// personal data where the first item is the full name of the
 	// user."
-	if i := strings.Index(u.Name, ","); i >= 0 {
+	if i := strings.IndexByte(u.Name, ','); i >= 0 {
 		u.Name = u.Name[:i]
 	}
 	return u, nil

src/pkg/path/match.go

@@ -43,7 +43,7 @@ Pattern:
 		star, chunk, pattern = scanChunk(pattern)
 		if star && chunk == "" {
 			// Trailing * matches rest of string unless it has a /.
-			return strings.Index(name, "/") < 0, nil
+			return strings.IndexByte(name, '/') < 0, nil
 		}
 		// Look for match at current position.
 		t, ok, err := matchChunk(chunk, name)

src/pkg/regexp/exec_test.go

@@ -293,7 +293,7 @@ func parseResult(t *testing.T, file string, lineno int, res string) []int {
 				out[n] = -1
 				out[n+1] = -1
 			} else {
-				k := strings.Index(pair, "-")
+				k := strings.IndexByte(pair, '-')
 				if k < 0 {
 					t.Fatalf("%s:%d: invalid pair %s", file, lineno, pair)
 				}
@@ -456,7 +456,7 @@ Reading:
 				continue Reading
 			}
 		case ':':
-			i := strings.Index(flag[1:], ":")
+			i := strings.IndexByte(flag[1:], ':')
 			if i < 0 {
 				t.Logf("skip: %s", line)
 				continue Reading

src/pkg/regexp/regexp.go

@@ -429,7 +429,7 @@ func Match(pattern string, b []byte) (matched bool, err error) {
 // in Expand, so for instance $1 represents the text of the first submatch.
 func (re *Regexp) ReplaceAllString(src, repl string) string {
 	n := 2
-	if strings.Index(repl, "$") >= 0 {
+	if strings.IndexByte(repl, '$') >= 0 {
 		n = 2 * (re.numSubexp + 1)
 	}
 	b := re.replaceAll(nil, src, n, func(dst []byte, match []int) []byte {
@@ -753,7 +753,7 @@ func (re *Regexp) ExpandString(dst []byte, template string, src string, match []
 
 func (re *Regexp) expand(dst []byte, template string, bsrc []byte, src string, match []int) []byte {
 	for len(template) > 0 {
-		i := strings.Index(template, "$")
+		i := strings.IndexByte(template, '$')
 		if i < 0 {
 			break
 		}

src/pkg/unicode/maketables.go

@@ -616,7 +616,7 @@ func verifyRange(name string, inCategory Op, table *unicode.RangeTable) {
 }
 
 func parseScript(line string, scripts map[string][]Script) {
-	comment := strings.Index(line, "#")
+	comment := strings.IndexByte(line, '#')
 	if comment >= 0 {
 		line = line[0:comment]
 	}