Function appendUnicodeEscape

json_fuzz_test.go:500–506

appendUnicodeEscape appends a `\uXXXX` escape sequence for the given code point to buf. Does NOT validate cp — callers use it for both valid BMP code points and for lone/invalid surrogates (which the parser must reject cleanly). cp must fit in 20 bits (the BMP range); higher bits are masked.

(buf *[]byte, cp int)

// code points and for lone/invalid surrogates (which the parser must reject
// cleanly). cp must fit in 20 bits (the BMP range); higher bits are masked.
func appendUnicodeEscape(buf *[]byte, cp int) {
	*buf = append(*buf, '\\', 'u',
		hexChars[(cp>>12)&0xF],
		hexChars[(cp>>8)&0xF],
		hexChars[(cp>>4)&0xF],
		hexChars[cp&0xF])
}

// =============================================================================
// JSON-aware mutation operators