vrepl: add support for Home and End keys (#16116)

vlib/builtin/utf8.c.v

@@ -57,30 +57,3 @@ pub fn string_from_wide2(_wstr &u16, len int) string {
 		return ''
 	}
 }
-
-// Reads an utf8 character from standard input
-pub fn utf8_getchar() int {
-	c := C.getchar()
-	len := utf8_len(u8(~c))
-	if c < 0 {
-		return 0
-	} else if len == 0 {
-		return c
-	} else if len == 1 {
-		return -1
-	} else {
-		mut uc := c & ((1 << (7 - len)) - 1)
-		for i := 0; i + 1 < len; i++ {
-			c2 := C.getchar()
-			if c2 != -1 && (c2 >> 6) == 2 {
-				uc <<= 6
-				uc |= (c2 & 63)
-			} else if c2 == -1 {
-				return 0
-			} else {
-				return -1
-			}
-		}
-		return uc
-	}
-}

vlib/builtin/utf8.v

@@ -124,29 +124,6 @@ pub fn (_bytes []u8) utf8_to_utf32() ?rune {
 	return res
 }
 
-// Calculate length to read from the first byte
-fn utf8_len(c u8) int {
-	mut b := 0
-	mut x := c
-	if (x & 240) != 0 {
-		// 0xF0
-		x >>= 4
-	} else {
-		b += 4
-	}
-	if (x & 12) != 0 {
-		// 0x0C
-		x >>= 2
-	} else {
-		b += 2
-	}
-	if (x & 2) == 0 {
-		// 0x02
-		b++
-	}
-	return b
-}
-
 // Calculate string length for formatting, i.e. number of "characters"
 // This is simplified implementation. if you need specification compliant width,
 // use utf8.east_asian.display_width.