Initial project import

tools/v/vlib/strconv/format_mem.js.v

@@ -0,0 +1,100 @@
+module strconv
+
+import strings
+
+pub fn format_str_sb(s string, p BF_param, mut sb strings.Builder) {
+	if p.len0 <= 0 {
+		sb.write_string(s)
+		return
+	}
+
+	dif := p.len0 - utf8_str_visible_length(s)
+
+	if dif <= 0 {
+		sb.write_string(s)
+		return
+	}
+
+	if p.align == .right {
+		for i1 := 0; i1 < dif; i1++ {
+			sb.write_u8(p.pad_ch)
+		}
+	}
+
+	sb.write_string(s)
+
+	if p.align == .left {
+		for i1 := 0; i1 < dif; i1++ {
+			sb.write_u8(p.pad_ch)
+		}
+	}
+}
+
+// digit pairs in reverse order
+const digit_pairs = '00102030405060708090011121314151617181910212223242526272829203132333435363738393041424344454647484940515253545556575859506162636465666768696071727374757677787970818283848586878889809192939495969798999'
+
+// format_dec_sb format a u64
+@[direct_array_access]
+pub fn format_dec_sb(d u64, p BF_param, mut res strings.Builder) {
+	mut n_char := dec_digits(d)
+	sign_len := if !p.positive || p.sign_flag { 1 } else { 0 }
+	number_len := sign_len + n_char
+	dif := p.len0 - number_len
+	mut sign_written := false
+
+	if p.align == .right {
+		if p.pad_ch == `0` {
+			if p.positive {
+				if p.sign_flag {
+					res.write_u8(`+`)
+					sign_written = true
+				}
+			} else {
+				res.write_u8(`-`)
+				sign_written = true
+			}
+		}
+		// write the pad chars
+		for i1 := 0; i1 < dif; i1++ {
+			res.write_u8(p.pad_ch)
+		}
+	}
+
+	if !sign_written {
+		// no pad char, write the sign before the number
+		if p.positive {
+			if p.sign_flag {
+				res.write_u8(`+`)
+			}
+		} else {
+			res.write_u8(`-`)
+		}
+	}
+
+	// Legacy version
+	// max u64 18446744073709551615 => 20 byte
+	mut buf := [32]u8{}
+	mut i := 20
+	mut d1 := d
+	for i >= (21 - n_char) {
+		buf[i] = u8(d1 % 10) + `0`
+
+		d1 = d1 / 10
+		i--
+	}
+
+	for _ in 0 .. n_char {
+		i++
+		res.write_u8(buf[i])
+	}
+	i++
+
+	//===========================================
+
+	if p.align == .left {
+		for i1 := 0; i1 < dif; i1++ {
+			res.write_u8(p.pad_ch)
+		}
+	}
+	return
+}