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Timothy Warren 3 months ago
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727baa5069
3 changed files with 415 additions and 0 deletions
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      .gitignore
  2. +2
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      Makefile
  3. +411
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      kilo.c

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.gitignore View File

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.idea
kilo

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Makefile View File

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kilo: kilo.c
$(CC) kilo.c -o kilo -Wall -Wextra -pedantic -std=c99

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kilo.c View File

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/*** includes ***/
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>

/*** defines ***/

#define KILO_VERSION "0.0.1"

#define CTRL_KEY(k) ((k) & 0x1f)

enum editorKey {
ARROW_LEFT = 1000,
ARROW_RIGHT,
ARROW_UP,
ARROW_DOWN,
DEL_KEY,
HOME_KEY,
END_KEY,
PAGE_UP,
PAGE_DOWN,
};

/*** data ***/

struct editorConfig {
int cx, cy;
int screenrows;
int screencols;
struct termios orig_termios;
};

struct editorConfig E;

/*** terminal ***/

void die(const char *s)
{
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);

perror(s);
exit(1);
}

void disableRawMode()
{
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1)
{
die("tcsetattr");
}
}

void enableRawMode()
{
if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1) {
die("tcgetattr");
}
atexit(disableRawMode);

struct termios raw = E.orig_termios;
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
raw.c_oflag &= ~(OPOST);
raw.c_cflag &= ~(CS8);
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
raw.c_cc[VMIN] = 0;
raw.c_cc[VTIME] = 1;

if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
{
die("tcsetattr");
}
}

int editorReadKey()
{
int nread;
char c;
while ((nread = read(STDIN_FILENO, &c, 1)) != 1)
{
if (nread == -1 && errno != EAGAIN)
{
die("read");
}
}

if (c == '\x1b')
{
char seq[3];

if (read(STDIN_FILENO, &seq[0], 1) != 1)
{
return '\x1b';
}

if (read(STDIN_FILENO, &seq[1], 1) != 1)
{
return '\x1b';
}

if (seq[0] == '[')
{
if (seq[1] >= '0' && seq[1] <= 9)
{
if (read(STDIN_FILENO, &seq[2], 1) != 1)
{
return '\x1b';
}

if (seq[2] == '~')
{
switch (seq[1])
{
case '1': return HOME_KEY;
case '3': return DEL_KEY;
case '4': return END_KEY;
case '5': return PAGE_UP;
case '6': return PAGE_DOWN;
case '7': return HOME_KEY;
case '8': return END_KEY;
}
}
}
else
{
switch (seq[1])
{
case 'A': return ARROW_UP;
case 'B': return ARROW_DOWN;
case 'C': return ARROW_RIGHT;
case 'D': return ARROW_LEFT;
case 'H': return HOME_KEY;
case 'F': return END_KEY;
}
}

}
else if (seq[0] == 'O')
{
switch (seq[1])
{
case 'H': return HOME_KEY;
case 'F': return END_KEY;
}
}

return '\x1b';
}

return c;
}

int getCursorPosition(int *rows, int *cols)
{
char buf[32];
unsigned int i = 0;

if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4)
{
return -1;
}

while (i < sizeof(buf) - 1)
{
if (read(STDIN_FILENO, &buf[i], 1) != 1)
{
break;
}

if (buf[i] == 'R')
{
break;
}

i++;
}
buf[i] = '\0';

if (buf[0] != '\x1b' || buf[1] != '[')
{
return -1;
}

if (sscanf(&buf[2], "%d;%d", rows, cols) != 2)
{
return -1;
}

return 0;
}

int getWindowSize(int *rows, int *cols)
{
struct winsize ws;

if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0)
{
if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12)
{
return -1;
}
else
{
return getCursorPosition(rows, cols);
}
}

*cols = ws.ws_col;
*rows = ws.ws_row;

return 0;
}

/*** append buffer ***/

struct abuf {
char *b;
int len;
};

#define ABUF_INIT {NULL, 0};

void abAppend(struct abuf *ab, const char *s, int len)
{
char *new = realloc(ab->b, ab->len + len);

if (new == NULL)
{
return;
}

memcpy(&new[ab->len], s, len);
ab->b = new;
ab->len += len;
}

void abFree(struct abuf *ab)
{
free(ab->b);
}

/*** output ***/

void editorDrawRows(struct abuf *ab)
{
int y;
for (y = 0; y < E.screenrows; y++)
{
if (y == E.screenrows / 3)
{
char welcome[80];
int welcomelen = snprintf(welcome, sizeof(welcome),
"Kilo editor -- version %s", KILO_VERSION);

if (welcomelen > E.screencols)
{
welcomelen = E.screencols;
}

int padding = (E.screencols - welcomelen) / 2;
if (padding)
{
abAppend(ab, "~", 1);
padding--;
}

while (padding--)
{
abAppend(ab, " ", 1);
}

abAppend(ab, welcome, welcomelen);
}
else
{
abAppend(ab, "~", 1);
}

abAppend(ab, "\x1b[K", 3);
if (y < E.screenrows - 1)
{
abAppend(ab, "\r\n", 2);
}
}
}

void editorRefreshScreen()
{
struct abuf ab = ABUF_INIT;

abAppend(&ab, "\x1b[?25l", 6);
abAppend(&ab, "\x1b[H", 3);

editorDrawRows(&ab);

char buf[32];
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", E.cy + 1, E.cx + 1);
abAppend(&ab, buf, strlen(buf));

abAppend(&ab, "\x1b[?25h", 6);

write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}

/*** input ***/

void editorMoveCursor(int key)
{
switch (key)
{
case ARROW_LEFT:
if (E.cx != 0)
{
E.cx--;
}
break;

case ARROW_RIGHT:
if (E.cx != E.screencols - 1)
{
E.cx++;
}
break;

case ARROW_UP:
if (E.cy != 0)
{
E.cy--;
}
break;

case ARROW_DOWN:
if (E.cy != E.screenrows - 1)
{
E.cy++;
}
break;
}
}

void editorProcessKeypress()
{
int c = editorReadKey();

switch (c)
{
case CTRL_KEY('q'):
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
exit(0);
break;

case HOME_KEY:
E.cx = 0;
break;

case END_KEY:
E.cx = E.screencols - 1;
break;

case PAGE_UP:
case PAGE_DOWN: {
int times = E.screenrows;
while (times--)
{
editorMoveCursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
}
}
break;

case ARROW_UP:
case ARROW_DOWN:
case ARROW_LEFT:
case ARROW_RIGHT:
editorMoveCursor(c);
break;
}
}

/*** init ***/

void initEditor()
{
E.cx = 0;
E.cy = 0;

if (getWindowSize(&E.screenrows, &E.screencols) == -1)
{
die("getWindowSize");
}
}

int main()
{
enableRawMode();
initEditor();

while (1)
{
editorRefreshScreen();
editorProcessKeypress();
}
return 0;
}


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