From 121aaa819958473e12197ff48933f7ca8cc4e7bc Mon Sep 17 00:00:00 2001
From: sumuel <samuel@yakubos.org>
Date: Thu, 6 Aug 2026 13:54:49 +0100
Subject: init

---
 Makefile | 22 +++++++++++++++++++
 README   |  1 +
 board.c  | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 board.h  | 12 ++++++++++
 main.c   | 46 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 158 insertions(+)
 create mode 100644 Makefile
 create mode 100644 README
 create mode 100644 board.c
 create mode 100644 board.h
 create mode 100644 main.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a4ccc66
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,22 @@
+PREFIX = /usr/local
+
+CFLAGS   = -std=c99 -pedantic -Wall -Wno-deprecated-declarations -O3
+NCURSES  = -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -lncurses -ltinfo
+
+CC = cc
+
+SRC = main.c board.c
+TARGET = sudoku
+
+all:
+	${CC} ${SRC} -o ${TARGET} ${CFLAGS} ${NCURSES}
+
+install: all
+	${CC} ${NCURSES} ${CFLAGS} ${SRC} -o ${TARGET}
+	cp -f sudoku ${DESTDIR}${PREFIX}/bin
+	chmod 755 ${DESTDIR}${PREFIX}/bin/${TARGET}
+
+uninstall:
+	rm -f ${DESTDIR}${PREFIX}/bin/${TARGET}
+
+
diff --git a/README b/README
new file mode 100644
index 0000000..364063d
--- /dev/null
+++ b/README
@@ -0,0 +1 @@
+This is a very slow and predictable sudoku puzzle generator
diff --git a/board.c b/board.c
new file mode 100644
index 0000000..4b9fb7c
--- /dev/null
+++ b/board.c
@@ -0,0 +1,77 @@
+#include <ncurses.h>
+#include <stdlib.h>
+#include <time.h>
+#include "board.h"
+
+int puzzle[81];
+int total = 0;
+
+void puzzle_swap(int puzzle[81]);
+
+void generate_first_line(int puzzle[81]) {
+    srand ( time(NULL) );
+    for (int i=0; i < 9; i++) {
+        puzzle[i] = i + 1;
+    }
+
+    for (int i=0; i < 9; i++) {
+        int random = (rand() % 9);
+        int swap;
+
+        swap = puzzle[random];
+        puzzle[random] = puzzle[i];
+        puzzle[i] = swap;
+
+    }
+}
+
+void print_puzzle(int puzzle[81], bool reveal) {
+    for (int i=0; i < 81; i++) {
+        if ( i     == 0 ) printw(" SUDOKU");
+        if ( i % 9 == 0 ) printw("\n");
+        else if ( i % 3 == 0 ) printw("|");
+        if ( i != 0 && i % 27 == 0 ) printw(" ===========================\n");
+
+        if (puzzle[i] & 2) printw("%2d ", puzzle[i]);
+        else if ( reveal == true ) printw("%2d ", puzzle[i]);
+        else       printw("   ");
+    }
+}
+
+void generate_puzzle(int puzzle[81]){
+    for (int i=9; i < 81; i++){
+        /* way too much nonsense to make a valid board
+         *  "The seed row method" -> https://sudokupulse.com/articles/how-to-create-sudoku-puzzles/
+        * row 2 */
+        if ( i < 15) puzzle[i] = puzzle[i-6];
+        else if ( i >= 15 && i < 18 ) puzzle[i] = puzzle[i-15];
+        /* row 3 */
+        else if ( i >= 18 && i < 24 ) puzzle[i] = puzzle[i-6];
+        else if ( i >= 24 && i < 27 ) puzzle[i] = puzzle[i-15];
+        /* row 4 */
+        else if ( i >= 27 && i < 35 ) puzzle[i] = puzzle[i-26];
+        else if ( i == 35 )           puzzle[i] = puzzle[i-35];
+        /* row 5 */
+        else if ( i >= 36 && i < 42 ) puzzle[i] = puzzle[i-6];
+        else if ( i >= 42 && i < 45 ) puzzle[i] = puzzle[i-15];
+        /* row 6 */
+        else if ( i >= 45 && i < 51 ) puzzle[i] = puzzle[i-6];
+        else if ( i >= 51 && i < 54 ) puzzle[i] = puzzle[i-15];
+        /* row 7 */
+        else if ( i >= 54 && i < 62 ) puzzle[i] = puzzle[i-26];
+        else if ( i == 62 )           puzzle[i] = puzzle[i-35];
+        /* row 8 */
+        else if ( i >= 63 && i < 69 ) puzzle[i] = puzzle[i-6];
+        else if ( i >= 69 && i < 72 ) puzzle[i] = puzzle[i-15];
+        /* row 9 */
+        else if ( i >= 72 && i < 78 ) puzzle[i] = puzzle[i-6];
+        else if ( i >= 78 && i < 81 ) puzzle[i] = puzzle[i-15];
+
+        puzzle_swap(puzzle);
+
+    }
+}
+
+void puzzle_swap(int puzzle[81]) {
+
+}
diff --git a/board.h b/board.h
new file mode 100644
index 0000000..becb68e
--- /dev/null
+++ b/board.h
@@ -0,0 +1,12 @@
+#ifndef BOARD_H_   /* Include guard */
+#define BOARD_H_
+
+extern int puzzle[81];
+
+void generate_first_line(int puzzle[81]);
+void generate_puzzle(int puzzle[81]);
+
+void print_puzzle(int puzzle[81], bool reveal);
+
+#endif // BOARD_H_
+
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..b79f16d
--- /dev/null
+++ b/main.c
@@ -0,0 +1,46 @@
+#include <ncurses.h>
+#include <stdlib.h>
+#include "board.h"
+
+int main(void) {
+	initscr();			/* Start curses mode 		*/
+    if(has_colors() == FALSE)
+	{	endwin();
+		printf("Your terminal does not support colour\n");
+		return 1;
+	}
+    start_color();			/* Start color 			*/
+    noecho();
+    curs_set(0);
+    /* End of ncurses init nonsense */ 
+
+    int ch;
+    bool reveal = false;
+    generate_first_line(puzzle);
+    generate_puzzle(puzzle);
+    
+    while (1) {
+        print_puzzle(puzzle, reveal);
+
+        ch = getch();
+        switch (ch) {
+            case 'q':
+                endwin();
+                return 1;
+                break;
+            case 'g':
+                reveal = false;
+                generate_first_line(puzzle);
+                generate_puzzle(puzzle);
+                break;
+            case 'r':
+                if ( reveal == true ) reveal = false;
+                else reveal = true;
+                break;
+        }
+        clear();
+    };
+
+    endwin();			/* End curses mode		  */
+    return 0;
+}
-- 
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