snek

commit 0a8a200c33b471c62dfa2039fd27291b98314d21
Author: aabacchus <ben@bvnf.space>
Date:   Tue, 27 Jul 2021 23:17:50 +0100

initial: snek head moves

Diffstat:
A
.gitignore
 | 
1
+
A
Makefile
 | 
9
+++++++++
A
main.c
 | 
115
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3 files changed, 125 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+snek
diff --git a/Makefile b/Makefile
@@ -0,0 +1,9 @@
+DEBUG=-ggdb3 -Og
+CFLAGS+=-Wall -Wextra -Wpedantic
+
+snek: main.c
+	$(CC) $(CFLAGS) $(DEBUG) -o snek main.c
+
+#%.c :
+#	$(CC) $(CFLAGS) $(DEBUG) $@
+
diff --git a/main.c b/main.c
@@ -0,0 +1,115 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <time.h>
+#include <unistd.h>
+
+//#define XCOLS 100
+//#define YROWS 100
+#define GRID_EMPTY 0
+#define GRID_SNAKE 1
+#define GRID_TRGET 2
+
+#define MAX_GENS 100
+
+char v = 0;
+
+struct Snake {
+    /* position of head */
+    int head[2];
+    /* velocity of head */
+    int v[2];
+    /* body length */
+    size_t len;
+};
+    
+void
+print_grid(int x, int y, char grid[x][y]){
+    for (int j = 0; j < y; j++){
+        for (int i = 0; i < x; i++)
+            printf("%c", grid[i][j] == GRID_SNAKE ? '#' : grid[i][j] == GRID_TRGET ? '@' : ' ');
+        printf("\n");
+    }
+}
+
+void
+new_target(int x, int y, char grid[x][y]){
+    int randx, randy;
+freshvalues:
+    randx = rand() % x;
+    randy = rand() % y;
+    if (!grid[randx][randy])
+        grid[randx][randy] = GRID_TRGET;
+    else goto freshvalues;
+}
+
+
+void
+plog(const char *msg, ...){
+    if (v){
+        va_list l;
+        va_start(l, msg);
+        vfprintf(stderr, msg, l);
+        va_end(l);
+    }
+}
+
+void
+die(const int err, const char *msg){
+    fprintf(stderr, msg);
+    exit(err);
+}
+
+int
+main(int argc, char **argv){
+    if (argc == 2 && !strcmp("-v", argv[1])) v = 1;
+    plog("Verbose logging enabled\n");
+
+    /* find terminal size */
+    struct winsize w;
+    if (ioctl(1, TIOCGWINSZ, &w) < 0){
+        perror("ioctl");
+        die(1, NULL);
+    }
+
+    int XCOLS = (int) w.ws_col;
+    int YROWS = (int) w.ws_row;
+
+    plog("found terminal size %dx%d\n", XCOLS, YROWS);
+
+    char grid[XCOLS][YROWS];
+    struct Snake snek;
+    snek.v[0] = 1;
+    snek.v[1] = 0;
+
+    /* initialise rand with a fresh seed */
+    srand((unsigned) time(NULL));
+    
+    /* initialise grid to be all 0's to begin with. */
+    for (int i = 0; i < XCOLS; i++)
+        for (int j = 0; j < YROWS; j++)
+            grid[i][j] = GRID_EMPTY;
+
+    /* choose a random starting point */
+    snek.head[0] = rand() % XCOLS;
+    snek.head[1] = rand() % YROWS;
+    grid[snek.head[0]][snek.head[1]] = GRID_SNAKE;
+
+    /* and a random point for the target */
+    new_target(XCOLS, YROWS, grid);
+
+    int gen = MAX_GENS;
+    while (gen--){
+        print_grid(XCOLS, YROWS, grid);
+        plog("snek head is %d,%d\nmoving at [%d,%d]\n", snek.head[0], snek.head[1], snek.v[0], snek.v[1]);
+        grid[snek.head[0]][snek.head[1]] = GRID_EMPTY;
+        snek.head[0] += snek.v[0];
+        snek.head[1] += snek.v[1];
+        grid[snek.head[0]][snek.head[1]] = GRID_SNAKE;
+        printf("hi\r");
+        sleep(1);
+    }
+
+}