Remove taint-tracking on single bytes and runes

Author: gagliardetto

ql/src/semmle/go/frameworks/stdlib/Strconv.qll

@@ -56,18 +56,6 @@ module Strconv {
       hasQualifiedName("strconv", "Quote") and
       (inp.isParameter(0) and outp.isResult())
       or
-      // signature: func QuoteRune(r rune) string
-      hasQualifiedName("strconv", "QuoteRune") and
-      (inp.isParameter(0) and outp.isResult())
-      or
-      // signature: func QuoteRuneToASCII(r rune) string
-      hasQualifiedName("strconv", "QuoteRuneToASCII") and
-      (inp.isParameter(0) and outp.isResult())
-      or
-      // signature: func QuoteRuneToGraphic(r rune) string
-      hasQualifiedName("strconv", "QuoteRuneToGraphic") and
-      (inp.isParameter(0) and outp.isResult())
-      or
       // signature: func QuoteToASCII(s string) string
       hasQualifiedName("strconv", "QuoteToASCII") and
       (inp.isParameter(0) and outp.isResult())
@@ -82,7 +70,7 @@ module Strconv {
       or
       // signature: func UnquoteChar(s string, quote byte) (value rune, multibyte bool, tail string, err error)
       hasQualifiedName("strconv", "UnquoteChar") and
-      (inp.isParameter(0) and outp.isResult([0, 2]))
+      (inp.isParameter(0) and outp.isResult(2))
     }
 
     override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {

ql/src/semmle/go/frameworks/stdlib/Strings.qll

@@ -150,10 +150,6 @@ module Strings {
       this.hasQualifiedName("strings", "Builder", "Write") and
       (inp.isParameter(0) and outp.isReceiver())
       or
-      // signature: func (*Builder).WriteByte(c byte) error
-      this.hasQualifiedName("strings", "Builder", "WriteByte") and
-      (inp.isParameter(0) and outp.isReceiver())
-      or
       // signature: func (*Builder).WriteString(s string) (int, error)
       this.hasQualifiedName("strings", "Builder", "WriteString") and
       (inp.isParameter(0) and outp.isReceiver())
@@ -166,14 +162,6 @@ module Strings {
       this.hasQualifiedName("strings", "Reader", "ReadAt") and
       (inp.isReceiver() and outp.isParameter(0))
       or
-      // signature: func (*Reader).ReadByte() (byte, error)
-      this.hasQualifiedName("strings", "Reader", "ReadByte") and
-      (inp.isReceiver() and outp.isResult(0))
-      or
-      // signature: func (*Reader).ReadRune() (ch rune, size int, err error)
-      this.hasQualifiedName("strings", "Reader", "ReadRune") and
-      (inp.isReceiver() and outp.isResult(0))
-      or
       // signature: func (*Reader).Reset(s string)
       this.hasQualifiedName("strings", "Reader", "Reset") and
       (inp.isParameter(0) and outp.isReceiver())