Add: program: words version 1

src/kernel/kmain.c

@@ -36,7 +36,7 @@ int kmain(int retvalue)
 
   // TODO: Grub modules to load programs
   
-  //timer_install();
+  timer_install();
   keyboard_install();
 
   shell_install();

src/kernel/shell.c

@@ -1,6 +1,7 @@
 #include "system.h"
 #include "../libc/stdio.h"
 #include "../libc/string.h"
+#include "../programs/programs.h"
 
 #define BUFFER_SIZE 256
 
@@ -26,6 +27,10 @@ void shell_install()
     {
 	printf("%d", 4/0);
     }
+    else if (strcmp(input_buffer, "words") == 0)
+    {
+	    program_words();
+    }
     else {
 	printf("Unknown command %s\n", input_buffer);
     }

src/kernel/system.h

@@ -22,5 +22,8 @@ void delay(int ticks);
 void keyboard_install();
 char keyboard_getchar();
 void shell_install();
+
+extern volatile unsigned long global_ticks;
+
 #endif
 

src/kernel/timer.c

@@ -1,16 +1,11 @@
 #include "system.h"
 #include "../libc/stdio.h"
 
-int timer_ticks = 0;
+volatile unsigned long global_ticks = 0;
 
 void timer_handler()
 {
-	timer_ticks++;
-
-	if(timer_ticks % 18 == 0)
-	{
-		puts("One second has passed\n");
-	}
+	global_ticks++;
 }
 
 void timer_install()
@@ -21,6 +16,6 @@ void timer_install()
 void delay(int ticks)
 {
 	unsigned long eticks;
-	eticks = timer_ticks + ticks;
-	while ((unsigned long)timer_ticks < eticks);
+	eticks = global_ticks + ticks;
+	while (global_ticks < eticks);
 }

src/libc/crypto.c

@@ -0,0 +1,24 @@
+#include "crypto.h"
+
+int lcg(int seed)
+{
+	int x = seed;
+
+	// Constants (ZX81 LCG)
+	int a = 75;
+	int c = 74;
+	long m = 65537;
+
+	for (int i=0; i<10; i++)
+	{
+		x = (a*x + c) % m;
+	}
+
+	return x;
+}
+
+int randint(int seed)
+{
+	int x = lcg(seed);
+	return x;
+}

src/libc/crypto.h

@@ -0,0 +1,9 @@
+#ifndef CRYPTO_H
+#define CRYPTO_H
+
+#define RAND_MAX 1024
+
+int lcg(int seed);
+int randint(int seed);
+
+#endif

src/programs/programs.h

@@ -0,0 +1,6 @@
+#ifndef PROGRAMS_H
+#define PROGRAMS_H
+
+void program_words();
+
+#endif

src/programs/words.c

@@ -0,0 +1,52 @@
+
+#include "../libc/stdio.h"
+#include "../libc/crypto.h"
+#include "../kernel/system.h"
+
+char* words[] =
+{
+	"I", "us", "they", "my",
+	"a", "an", "is", "are", "for", "while", "not", "none", "yes", "no",
+	"absolutely", "addition", "additive", "afternoon", "architect", "ask",
+	"be", "blindfold", "brilliant", "boy", "brilliant", "bring", "buddy",
+	"career", "caterpillar", "change", "cheeky", "chop",
+	"decide", "demonstrate", "draw", "druggist",
+	"eagle", "ear", "effort", "evening", 
+	"fabric", "famous", "fuse",
+	"generation", "generous", "girl", "gypsy", "grip",
+	"habit", "handsome", "helmet", "help", "horror",
+	"insist", "inventor", "itself", "ivory",
+	"jog", "joint", "joke", "judge", 
+	"karate", "kebab", "kitchen",
+	"lamb", "lawnmower", "left", "lock",
+	"math", "medicine", "most",
+	"noodles", "nowadays", "nowhere",
+	"ocean", "older", "ounce",
+	"part", "pathetic", "pastime",
+	"quite", "quits", "quotation",
+	"race", "raise", "reality",
+	"safe", "scare", "screen",
+	"taught", "temple", "that", "this",
+	"unable", "unkind", "usual",
+	"velvet", "vivid", "vote",
+	"we", "warm", "watch",
+	"xylophone",
+	"yolk", "young", "your",
+	"zebra", "zodiac", "zucchini",
+};
+
+int words_size = sizeof(words)/sizeof(words[0]);
+
+// Generates 5 random words
+void program_words()
+{
+	for (int i=0; i<10; i++)
+	{
+		int random = randint(global_ticks);
+		char* word = words[random%words_size];
+		//printf("Global ticks: %d\nRandom integer: %d\nWord: %s\n", global_ticks, random, word);
+		printf("%s ", word);
+		delay(10);
+	}
+	puts("\n");
+}