From c1efdf9b0875f2a39488a86cd838947a24fab9fc Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Tue, 2 May 2023 21:02:04 +1000
Subject: Initial commit.

---
 standard.c | 192 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 192 insertions(+)
 create mode 100644 standard.c

(limited to 'standard.c')

diff --git a/standard.c b/standard.c
new file mode 100644
index 0000000..801777c
--- /dev/null
+++ b/standard.c
@@ -0,0 +1,192 @@
+#include <stdint.h>
+
+#include "standard.h"
+
+int string_equal(const char* a, const char* b) {
+	while (*a && *b) {
+		if (*a != *b) { return 0; }
+		a++; b++;
+	}
+	return 1;
+}
+
+#define sin_table_count 256
+
+static const int sin_table[sin_table_count] = {
+	0, 25, 50, 75,
+	100, 125, 150, 175,
+	200, 224, 249, 273,
+	297, 321, 345, 369,
+	392, 415, 438, 460,
+	483, 505, 526, 548,
+	569, 590, 610, 630,
+	650, 669, 688, 706,
+	724, 742, 759, 775,
+	792, 807, 822, 837,
+	851, 865, 878, 891,
+	903, 915, 926, 936,
+	946, 955, 964, 972,
+	980, 987, 993, 999,
+	1004, 1009, 1013, 1016,
+	1019, 1021, 1023, 1024,
+	1024, 1024, 1023, 1021,
+	1019, 1016, 1013, 1009,
+	1004, 999, 993, 987,
+	980, 972, 964, 955,
+	946, 936, 926, 915,
+	903, 891, 878, 865,
+	851, 837, 822, 807,
+	792, 775, 759, 742,
+	724, 706, 688, 669,
+	650, 630, 610, 590,
+	569, 548, 526, 505,
+	483, 460, 438, 415,
+	392, 369, 345, 321,
+	297, 273, 249, 224,
+	200, 175, 150, 125,
+	100, 75, 50, 25,
+	0, -25, -50, -75,
+	-100, -125, -150, -175,
+	-200, -224, -249, -273,
+	-297, -321, -345, -369,
+	-392, -415, -438, -460,
+	-483, -505, -526, -548,
+	-569, -590, -610, -630,
+	-650, -669, -688, -706,
+	-724, -742, -759, -775,
+	-792, -807, -822, -837,
+	-851, -865, -878, -891,
+	-903, -915, -926, -936,
+	-946, -955, -964, -972,
+	-980, -987, -993, -999,
+	-1004, -1009, -1013, -1016,
+	-1019, -1021, -1023, -1024,
+	-1024, -1024, -1023, -1021,
+	-1019, -1016, -1013, -1009,
+	-1004, -999, -993, -987,
+	-980, -972, -964, -955,
+	-946, -936, -926, -915,
+	-903, -891, -878, -865,
+	-851, -837, -822, -807,
+	-792, -775, -759, -742,
+	-724, -706, -688, -669,
+	-650, -630, -610, -590,
+	-569, -548, -526, -505,
+	-483, -460, -438, -415,
+	-392, -369, -345, -321,
+	-297, -273, -249, -224,
+	-200, -175, -150, -125,
+	-100, -75, -50, -25
+};
+
+int fsqrt(int n) {
+	int lo, hi, mid, i, mm;
+
+	if (n <= 0) { return INT32_MAX; }
+
+	lo = mini(1, n);
+	hi = maxi(1, n);
+
+	while ((100 << fbits * lo * lo) >> fbits * 2) {
+		lo *= (10 << fbits) >> fbits;
+	}
+
+	while ((5 * hi * hi) >> fbits * 2 > n) {
+		hi *= (1 << fbits) / 10;
+	}
+
+	for (i = 0; i < 100; i++) {
+		mid = ((lo + hi) * (1 << fbits)) / (2 << fbits);
+		mm = mid * mid >> fbits;
+		if (mm == n) { return mid; }
+		if (mm > n)  { hi = mid; }
+		else         { lo = mid; }
+	}
+
+	return mid;
+}
+
+int absolute(int x) {
+	return x >= 0 ? x : -x;
+}
+
+int fsin(int t) {
+	int index;
+	int sign;
+
+	sign = t >= 0 ? 1 : -1;
+	t = absolute(t);
+
+	index = (t * (sin_table_count) / ((1 << fbits) * 2));
+	index = index % sin_table_count;
+
+	return sign * sin_table[index];
+}
+
+int fcos(int t) {
+	return fsin((1 << fbits) / 2 - t);
+}
+
+int ftan(int t) {
+	return (fsin(t) << fbits) / fcos(t);
+}
+
+int flerp(int a, int b, int t) {
+	return a + ((t * (b - a)) >> fbits);
+}
+
+int int_to_buf(int n, char* buf) {
+	int i, sign, t;
+	unsigned n1;
+
+	if(n == 0) {
+		buf[0] = '0';
+		buf[1] = '\0';
+		return 1;
+	}
+
+	i = 0;
+	sign = n < 0;
+
+	n1 = sign ? -n : n;
+
+	while (n1 != 0) {
+		buf[i++] = n1 % 10 + '0';
+		n1 =n1 / 10;
+	}
+
+	if(sign) {
+		buf[i++] = '-';
+ 	}
+
+	buf[i] = '\0';
+
+	for (t = 0; t < i / 2; t++) {
+		buf[t] ^= buf[i - t - 1];
+		buf[i - t - 1] ^= buf[t];
+		buf[t] ^= buf[i - t - 1];
+	}
+
+	return i;
+}
+
+int f_to_buf(int f, char* buf) {
+	int frac, w, i;
+
+	frac = (((f) % (1 << fbits)) * 100) >> fbits;
+	w = f >> fbits;
+
+	i = 0;
+
+	if (f < 0) {
+		buf[i] = '-';
+		i++;
+	}
+
+	i += int_to_buf(absolute(w), buf + i);
+	buf[i] = '.';
+	i++;
+	i += int_to_buf(absolute(frac), buf + i);
+
+	return i;
+}
-- 
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