skeeto

enum {
    BASE = 1000000000,  // nine decimals per limb
    NUMCAP = 1<<16,     // capacity just over a half million decimals
};

typedef struct {
    int *digits;
    int  len;
} num;

skeeto

#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#define assert(c)  while (!(c)) *(volatile int *)0 = 0
#define new(a, t)  (t *)alloc(a, sizeof(t))

typedef struct {
    char *beg, *end;

skeeto

// Transaction counter
//
// Input: Null-terminated null-terminated string array. Each string has
// three non-negative integers under 1e9: "sender-id receiver-id amount"
// The amount field is unused.
//
// Output: A null-terminated, numerically sorted null-terminated string
// array of ids that exceeded a given transaction count threshold.
//
// Ref: https://old.reddit.com/r/C_Programming/comments/174dwcb

skeeto

// $ go test -bench=.
// goos: windows
// goarch: amd64
// pkg: x
// cpu: 12th Gen Intel(R) Core(TM) i9-12900
// BenchmarkFixed-24               21196731                54.78 ns/op
// BenchmarkVariable-24            10045690               117.7 ns/op
// BenchmarkMappedCold-24          14038420                93.53 ns/op
// BenchmarkMappedWarm-24          21380121                53.21 ns/op
// BenchmarkBytes-24               19775221                82.31 ns/op

skeeto

// $ eval cc icosphere.c $(pkg-config --cflags --libs sdl2) -lopengl32
// Ref: http://blog.andreaskahler.com/2009/06/creating-icosphere-mesh-in-code.html
// Ref: https://old.reddit.com/r/C_Programming/comments/16ionwe
#include <math.h>
#include <stdint.h>
#include <string.h>

#define new(h, t, n) (t *)alloc(h, sizeof(t), _Alignof(t), n)

typedef struct {

skeeto

// https://old.reddit.com/r/C_Programming/comments/16ho5ql/implementing_and_simplifying_treap_in_c/
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define new(h, t) (t *)alloc(h, sizeof(t), _Alignof(t))
#define assert(c) while (!(c)) __builtin_trap()

skeeto

CC     = cc
CFLAGS = -w -g3 -DC_ONLY -fcommon -DGAME_HARD_LINKED

all: quake2.exe ref_soft.dll

game_obj = \
	game/g_ai.o game/g_chase.o game/g_cmds.o game/g_combat.o game/g_func.o \
	game/g_items.o game/g_main.o game/g_misc.o game/g_monster.o game/g_phys.o \
	game/g_save.o game/g_spawn.o game/g_svcmds.o game/g_target.o \
	game/g_trigger.o game/g_turret.o game/g_utils.o game/g_weapon.o \

skeeto

// SVG generator example
//   $ cc -DDEMO -o svg svg.c
//   $ ./svg >demo.svg
// Large demo:
//   $ cc -DBIGDEMO -o svg svg.c
//   $ ./svg >bigdemo.svg
// This is free and unencumbered software released into the public domain.
#include <stddef.h>
#include <stdint.h>

skeeto

// Arlet Ottens's 16 byte random generator
// $ cc -O3 -o rand16 rand16.c
// $ ./rand16 | RNG_test stdin32
// https://github.com/Arlet/pseudo-random-number-generator/blob/main/avr/rand16.S
#include <stdint.h>
#include <stdio.h>

uint32_t rand16(uint8_t s[16])
{
    uint8_t t, c, r[32];

skeeto

module x

go 1.21.0