Apple-2-SW/apple2a
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Switch to explicit int types (uint16_t, etc.).

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This commit is contained in:
Lawrence Kesteloot 2018-08-01 13:37:31 -07:00
parent a57bbe3c65
commit a324d8814b
2 changed files with 76 additions and 65 deletions
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130
main.c
View File

@ -1,7 +1,7 @@
#include "platform.h"
char *title = "Apple IIa";
unsigned char title_length = 9;
uint8_t *title = "Apple IIa";
uint8_t title_length = 9;
#define CURSOR_GLYPH 127
#define SCREEN_WIDTH 40
@ -12,26 +12,26 @@ unsigned char title_length = 9;
#define T_LIST 0x82
// List of tokens. The token value is the index plus 0x80.
static unsigned char *TOKEN[] = {
static uint8_t *TOKEN[] = {
"HOME",
"PRINT",
"LIST",
};
static int TOKEN_COUNT = sizeof(TOKEN)/sizeof(TOKEN[0]);
static int16_t TOKEN_COUNT = sizeof(TOKEN)/sizeof(TOKEN[0]);
// Location of cursor in logical screen space.
unsigned int g_cursor_x = 0;
unsigned int g_cursor_y = 0;
uint16_t g_cursor_x = 0;
uint16_t g_cursor_y = 0;
// Whether the cursor is being displayed.
unsigned int g_showing_cursor = 0;
uint16_t g_showing_cursor = 0;
// Character at the cursor location.
unsigned char g_cursor_ch = 0;
unsigned char g_input_buffer[40];
int g_input_buffer_length = 0;
uint8_t g_cursor_ch = 0;
uint8_t g_input_buffer[40];
int16_t g_input_buffer_length = 0;
// Compiled binary.
unsigned char g_compiled[128];
int g_compiled_length = 0;
uint8_t g_compiled[128];
int16_t g_compiled_length = 0;
void (*g_compiled_function)() = (void (*)()) g_compiled;
// Stored program. Each line is:
@ -39,15 +39,15 @@ void (*g_compiled_function)() = (void (*)()) g_compiled;
// - Two bytes for line number.
// - Program line.
// - Nul.
unsigned char g_program[1024];
unsigned char *g_program_head;
uint8_t g_program[1024];
uint8_t *g_program_head;
/**
* Return the memory location of the cursor.
*/
static volatile unsigned char *cursor_pos() {
int block = g_cursor_y >> 3;
int line = g_cursor_y & 0x07;
static volatile uint8_t *cursor_pos() {
int16_t block = g_cursor_y >> 3;
int16_t line = g_cursor_y & 0x07;
return TEXT_PAGE1_BASE + line*SCREEN_STRIDE + block*SCREEN_WIDTH + g_cursor_x;
}
@ -57,7 +57,7 @@ static volatile unsigned char *cursor_pos() {
*/
static void show_cursor() {
if (!g_showing_cursor) {
volatile unsigned char *pos = cursor_pos();
volatile uint8_t *pos = cursor_pos();
g_cursor_ch = *pos;
*pos = CURSOR_GLYPH | 0x80;
g_showing_cursor = 1;
@ -69,7 +69,7 @@ static void show_cursor() {
*/
static void hide_cursor() {
if (g_showing_cursor) {
volatile unsigned char *pos = cursor_pos();
volatile uint8_t *pos = cursor_pos();
*pos = g_cursor_ch;
g_showing_cursor = 0;
}
@ -79,7 +79,7 @@ static void hide_cursor() {
* Moves the cursor to the specified location, where X
* is 0 to 39 inclusive, Y is 0 to 23 inclusive.
*/
static void move_cursor(int x, int y) {
static void move_cursor(int16_t x, int16_t y) {
hide_cursor();
g_cursor_x = x;
g_cursor_y = y;
@ -89,9 +89,9 @@ static void move_cursor(int x, int y) {
* Clear the screen with non-reversed spaces.
*/
static void home() {
volatile unsigned char *p = TEXT_PAGE1_BASE;
unsigned char ch = ' ' | 0x80;
int i;
volatile uint8_t *p = TEXT_PAGE1_BASE;
uint8_t ch = ' ' | 0x80;
int16_t i;
// TODO: Could write these as words, not chars.
for (i = SCREEN_STRIDE*8; i >= 0; i--) {
@ -104,8 +104,8 @@ static void home() {
/**
* Prints the character and advances the cursor. Handles newlines.
*/
static void print_char(unsigned char c) {
volatile unsigned char *loc = cursor_pos();
static void print_char(uint8_t c) {
volatile uint8_t *loc = cursor_pos();
if (c == '\n') {
// TODO: Scroll.
@ -120,36 +120,36 @@ static void print_char(unsigned char c) {
/**
* Print a string at the cursor.
*/
static void print(unsigned char *s) {
static void print(uint8_t *s) {
while (*s != '\0') {
print_char(*s++);
}
}
/**
* Print an unsigned integer.
* Print an uint16_teger.
*/
static void print_int(unsigned int i) {
static void print_int(uint16_t i) {
// Is this the best way to do this? I've seen it done backwards, where
// digits are added to a buffer least significant digit first, then reversed,
// but this seems faster.
if (i >= 10000) {
int r = i / 10000;
int16_t r = i / 10000;
print_char('0' + r);
i -= r*10000;
}
if (i >= 1000) {
int r = i / 1000;
int16_t r = i / 1000;
print_char('0' + r);
i -= r*1000;
}
if (i >= 100) {
int r = i / 100;
int16_t r = i / 100;
print_char('0' + r);
i -= r*100;
}
if (i >= 10) {
int r = i / 10;
int16_t r = i / 10;
print_char('0' + r);
i -= r*10;
}
@ -159,7 +159,7 @@ static void print_int(unsigned int i) {
/**
* Copy a memory buffer. Source and destination must not overlap.
*/
static void memcpy(unsigned char *dest, unsigned char *src, int count) {
static void memcpy(uint8_t *dest, uint8_t *src, int16_t count) {
while (count-- > 0) {
*dest++ = *src++;
}
@ -168,8 +168,8 @@ static void memcpy(unsigned char *dest, unsigned char *src, int count) {
/**
* Get the length of a nul-terminated string.
*/
static int strlen(unsigned char *s) {
unsigned char *original = s;
static int16_t strlen(uint8_t *s) {
uint8_t *original = s;
while (*s != '\0') {
s += 1;
@ -182,7 +182,7 @@ static int strlen(unsigned char *s) {
* Print the tokenized string, with tokens displayed as their full text.
* Prints a newline at the end.
*/
static void print_detokenized(unsigned char *s) {
static void print_detokenized(uint8_t *s) {
while (*s != '\0') {
if (*s >= 0x80) {
print_char(' ');
@ -202,15 +202,15 @@ static void print_detokenized(unsigned char *s) {
* Get the pointer to the next line in the stored program. Returns 0
* if we're at the end.
*/
static unsigned char *get_next_line(unsigned char *line) {
return *((unsigned char **) line);
static uint8_t *get_next_line(uint8_t *line) {
return *((uint8_t **) line);
}
/**
* Get the line number of a stored program line.
*/
static unsigned int get_line_number(unsigned char *line) {
return *((unsigned int *) (line + 2));
static uint16_t get_line_number(uint8_t *line) {
return *((uint16_t *) (line + 2));
}
/**
@ -220,7 +220,7 @@ static unsigned int get_line_number(unsigned char *line) {
* an optional starting point, to use as an optimization instead of starting
* from the beginning.
*/
static unsigned char *get_end_of_program(unsigned char *line) {
static uint8_t *get_end_of_program(uint8_t *line) {
if (g_program_head == 0) {
// No program.
return g_program;
@ -231,7 +231,7 @@ static unsigned char *get_end_of_program(unsigned char *line) {
}
while (1) {
unsigned char *next_line = get_next_line(line);
uint8_t *next_line = get_next_line(line);
if (next_line == 0) {
// Last line of program.
@ -255,7 +255,7 @@ static void print_statement() {
* List the stored program.
*/
static void list_statement() {
unsigned char *line = g_program_head;
uint8_t *line = g_program_head;
while (line != 0) {
print_int(get_line_number(line));
@ -270,7 +270,7 @@ static void list_statement() {
/**
* If a starts with string b, returns the position in a after b. Else returns null.
*/
static unsigned char *skip_over(unsigned char *a, unsigned char *b) {
static uint8_t *skip_over(uint8_t *a, uint8_t *b) {
while (*a != '\0' && *b != '\0') {
if (*a != *b) {
// Doesn't start with b.
@ -297,7 +297,7 @@ static void syntax_error() {
* Add a function call to the compiled buffer.
*/
static void add_call(void (*function)(void)) {
unsigned int addr = (int) function;
uint16_t addr = (int16_t) function;
g_compiled[g_compiled_length++] = 0x20; // JSR
g_compiled[g_compiled_length++] = addr & 0xFF;
@ -315,7 +315,7 @@ static void add_return() {
* Advance s over whitespace, which is just a space, returning
* the new pointer.
*/
static unsigned char *skip_whitespace(unsigned char *s) {
static uint8_t *skip_whitespace(uint8_t *s) {
while (*s == ' ') {
s += 1;
}
@ -327,9 +327,9 @@ static unsigned char *skip_whitespace(unsigned char *s) {
* Tokenize a string in place. Returns (and removes) any line number, or 0xFFFF
* if there's none. The new line will be terminated by three nuls.
*/
static unsigned int tokenize(unsigned char *s) {
unsigned char *t = s; // Tokenized version.
int line_number;
static uint16_t tokenize(uint8_t *s) {
uint8_t *t = s; // Tokenized version.
int16_t line_number;
// Parse optional line number.
if (*s >= '0' && *s <= '9') {
@ -349,8 +349,8 @@ static unsigned int tokenize(unsigned char *s) {
// Skip spaces.
s++;
} else {
int i;
unsigned char *skipped = 0;
int16_t i;
uint8_t *skipped = 0;
for (i = 0; i < TOKEN_COUNT; i++) {
skipped = skip_over(s, TOKEN[i]);
@ -384,8 +384,8 @@ static unsigned int tokenize(unsigned char *s) {
* a pointer to it. If the line does not exist, returns a pointer to
* the previous line.
*/
static unsigned char *find_line(unsigned int line_number) {
unsigned char *line;
static uint8_t *find_line(uint16_t line_number) {
uint8_t *line;
if (g_program_head == 0) {
// No program.
@ -395,7 +395,7 @@ static unsigned char *find_line(unsigned int line_number) {
line = g_program_head;
while (1) {
unsigned char *next_line;
uint8_t *next_line;
// See if we hit it.
if (get_line_number(line) == line_number) {
@ -418,9 +418,9 @@ static unsigned char *find_line(unsigned int line_number) {
* and executing it.
*/
static void process_input_buffer() {
unsigned char *s; // Where we are in the buffer.
char done;
unsigned int line_number;
uint8_t *s; // Where we are in the buffer.
int8_t done;
uint16_t line_number;
g_input_buffer[g_input_buffer_length] = '\0';
@ -434,7 +434,7 @@ static void process_input_buffer() {
g_compiled_length = 0;
do {
char error = 0;
int8_t error = 0;
// Default to being done after one statement.
done = 1;
@ -486,7 +486,7 @@ static void process_input_buffer() {
g_compiled_function();
}
} else {
unsigned char *line = find_line(line_number);
uint8_t *line = find_line(line_number);
// Stored mode. Add line to program.
if (line == 0) {
@ -520,9 +520,9 @@ static void process_input_buffer() {
}
}
int main(void)
int16_t main(void)
{
int blink;
int16_t blink;
// Initialize variables.
g_program_head = 0;
@ -532,9 +532,9 @@ int main(void)
// Display the character set.
if (0) {
int i;
int16_t i;
for (i = 0; i < 256; i++) {
volatile unsigned char *loc;
volatile uint8_t *loc;
// Fails with: unhandled instruction B2
move_cursor(i % 16, i >> 4);
// Works.
@ -572,7 +572,7 @@ int main(void)
hide_cursor();
while(keyboard_test()) {
unsigned char key;
uint8_t key;
key = keyboard_get();
if (key == 8) {
@ -591,7 +591,7 @@ int main(void)
g_input_buffer_length = 0;
} else {
if (g_input_buffer_length < sizeof(g_input_buffer) - 1) {
volatile unsigned char *loc = cursor_pos();
volatile uint8_t *loc = cursor_pos();
*loc = key | 0x80;
move_cursor(g_cursor_x + 1, g_cursor_y);

11
platform.h
View File

@ -1,6 +1,15 @@
#ifndef __PLATFORM_H__
#define __PLATFORM_H__
#define TEXT_PAGE1_BASE ((volatile unsigned char *)0x400)
#define TEXT_PAGE2_BASE ((volatile unsigned char *)0x800)
// Standard types.
typedef signed char int8_t;
typedef unsigned char uint8_t;
typedef signed int int16_t;
typedef unsigned int uint16_t;
// Returns non-zero if a key is ready to be read.
extern int keyboard_test(void);
@ -9,3 +18,5 @@ extern void keyboard_next(void);
// Wait until a key is ready and then return it without high bit set
extern unsigned char keyboard_get(void);
#endif // __PLATFORM_H__