1 files changed, 205 insertions, 0 deletions
diff --git a/v_windows/v/vlib/builtin/float.c.v b/v_windows/v/vlib/builtin/float.c.v
new file mode 100644
index 0000000..99fe8b8
--- /dev/null
+++ b/v_windows/v/vlib/builtin/float.c.v
@@ -0,0 +1,205 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
+module builtin
+
+import strconv
+
+#include <float.h>
+/*
+-----------------------------------
+----- f64 to string functions -----
+*/
+// str return a `f64` as `string` in suitable notation.
+[inline]
+pub fn (x f64) str() string {
+	unsafe {
+		f := strconv.Float64u{
+			f: x
+		}
+		if f.u == strconv.double_minus_zero {
+			return '-0'
+		}
+		if f.u == strconv.double_plus_zero {
+			return '0'
+		}
+	}
+	abs_x := f64_abs(x)
+	if abs_x >= 0.0001 && abs_x < 1.0e6 {
+		return strconv.f64_to_str_l(x)
+	} else {
+		return strconv.ftoa_64(x)
+	}
+}
+
+// strg return a `f64` as `string` in "g" printf format
+[inline]
+pub fn (x f64) strg() string {
+	if x == 0 {
+		return '0'
+	}
+	abs_x := f64_abs(x)
+	if abs_x >= 0.0001 && abs_x < 1.0e6 {
+		return strconv.f64_to_str_l_no_dot(x)
+	} else {
+		return strconv.ftoa_64(x)
+	}
+}
+
+// str returns the value of the `float_literal` as a `string`.
+[inline]
+pub fn (d float_literal) str() string {
+	return f64(d).str()
+}
+
+// strsci returns the `f64` as a `string` in scientific notation with `digit_num` decimals displayed, max 17 digits.
+// Example: assert f64(1.234).strsci(3) == '1.234e+00'
+[inline]
+pub fn (x f64) strsci(digit_num int) string {
+	mut n_digit := digit_num
+	if n_digit < 1 {
+		n_digit = 1
+	} else if n_digit > 17 {
+		n_digit = 17
+	}
+	return strconv.f64_to_str(x, n_digit)
+}
+
+// strlong returns a decimal notation of the `f64` as a `string`.
+// Example: assert f64(1.23456).strlong() == '1.23456'
+[inline]
+pub fn (x f64) strlong() string {
+	return strconv.f64_to_str_l(x)
+}
+
+/*
+-----------------------------------
+----- f32 to string functions -----
+*/
+// str returns a `f32` as `string` in suitable notation.
+[inline]
+pub fn (x f32) str() string {
+	unsafe {
+		f := strconv.Float32u{
+			f: x
+		}
+		if f.u == strconv.single_minus_zero {
+			return '-0'
+		}
+		if f.u == strconv.single_plus_zero {
+			return '0'
+		}
+	}
+	abs_x := f32_abs(x)
+	if abs_x >= 0.0001 && abs_x < 1.0e6 {
+		return strconv.f32_to_str_l(x)
+	} else {
+		return strconv.ftoa_32(x)
+	}
+}
+
+// strg return a `f32` as `string` in "g" printf format
+[inline]
+pub fn (x f32) strg() string {
+	if x == 0 {
+		return '0'
+	}
+	abs_x := f32_abs(x)
+	if abs_x >= 0.0001 && abs_x < 1.0e6 {
+		return strconv.f32_to_str_l_no_dot(x)
+	} else {
+		return strconv.ftoa_32(x)
+	}
+}
+
+// strsci returns the `f32` as a `string` in scientific notation with `digit_num` deciamals displayed, max 8 digits.
+// Example: assert f32(1.234).strsci(3) == '1.234e+00'
+[inline]
+pub fn (x f32) strsci(digit_num int) string {
+	mut n_digit := digit_num
+	if n_digit < 1 {
+		n_digit = 1
+	} else if n_digit > 8 {
+		n_digit = 8
+	}
+	return strconv.f32_to_str(x, n_digit)
+}
+
+// strlong returns a decimal notation of the `f32` as a `string`.
+[inline]
+pub fn (x f32) strlong() string {
+	return strconv.f32_to_str_l(x)
+}
+
+/*
+-----------------------
+----- C functions -----
+*/
+// f32_abs returns the absolute value of `a` as a `f32` value.
+// Example: assert f32_abs(-2.0) == 2.0
+[inline]
+pub fn f32_abs(a f32) f32 {
+	return if a < 0 { -a } else { a }
+}
+
+// f64_abs returns the absolute value of `a` as a `f64` value.
+// Example: assert f64_abs(-2.0) == f64(2.0)
+[inline]
+fn f64_abs(a f64) f64 {
+	return if a < 0 { -a } else { a }
+}
+
+// f32_max returns the largest `f32` of input `a` and `b`.
+// Example: assert f32_max(2.0,3.0) == 3.0
+[inline]
+pub fn f32_max(a f32, b f32) f32 {
+	return if a > b { a } else { b }
+}
+
+// f32_min returns the smallest `f32` of input `a` and `b`.
+// Example: assert f32_min(2.0,3.0) == 2.0
+[inline]
+pub fn f32_min(a f32, b f32) f32 {
+	return if a < b { a } else { b }
+}
+
+// f64_max returns the largest `f64` of input `a` and `b`.
+// Example: assert f64_max(2.0,3.0) == 3.0
+[inline]
+pub fn f64_max(a f64, b f64) f64 {
+	return if a > b { a } else { b }
+}
+
+// f64_min returns the smallest `f64` of input `a` and `b`.
+// Example: assert f64_min(2.0,3.0) == 2.0
+[inline]
+fn f64_min(a f64, b f64) f64 {
+	return if a < b { a } else { b }
+}
+
+// eq_epsilon returns true if the `f32` is equal to input `b`.
+// using an epsilon of typically 1E-5 or higher (backend/compiler dependent).
+// Example: assert f32(2.0).eq_epsilon(2.0)
+[inline]
+pub fn (a f32) eq_epsilon(b f32) bool {
+	hi := f32_max(f32_abs(a), f32_abs(b))
+	delta := f32_abs(a - b)
+	if hi > f32(1.0) {
+		return delta <= hi * (4 * f32(C.FLT_EPSILON))
+	} else {
+		return (1 / (4 * f32(C.FLT_EPSILON))) * delta <= hi
+	}
+}
+
+// eq_epsilon returns true if the `f64` is equal to input `b`.
+// using an epsilon of typically 1E-9 or higher (backend/compiler dependent).
+// Example: assert f64(2.0).eq_epsilon(2.0)
+[inline]
+pub fn (a f64) eq_epsilon(b f64) bool {
+	hi := f64_max(f64_abs(a), f64_abs(b))
+	delta := f64_abs(a - b)
+	if hi > 1.0 {
+		return delta <= hi * (4 * f64(C.DBL_EPSILON))
+	} else {
+		return (1 / (4 * f64(C.DBL_EPSILON))) * delta <= hi
+	}
+}