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This commit is contained in:
Aaron Fischer 2018-09-17 14:48:14 +02:00
parent 168a119064
commit c54779f0ff

52
kilo.c
View file

@ -1,11 +1,16 @@
/*** includes ***/
#define _DEFAULT_SOURCE
#define _BSD_SOURCE
#define _GNU_SOURCE
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <termios.h>
#include <unistd.h>
@ -30,10 +35,17 @@ enum editorKey {
/*** data ***/
typedef struct erow {
int size;
char *chars;
} erow;
struct editorConfig {
int cx, cy;
int screenrows;
int screencols;
int numrows;
erow row;
struct termios orig_termios;
};
@ -156,6 +168,32 @@ int getWindowSize(int *rows, int *cols) {
}
}
/*** file i/o ***/
void editorOpen(char *filename) {
FILE *fp = fopen(filename, "r");
if (!fp) die("fopen");
char *line = NULL;
size_t linecap = 0;
ssize_t linelen;
linelen = getline(&line, &linecap, fp);
if (linelen != -1) {
while (linelen > 0 && (line[linelen - 1] == '\n' ||
line[linelen - 1] == '\r'))
linelen--;
E.row.size = linelen;
E.row.chars = malloc(linelen + 1);
memcpy(E.row.chars, line, linelen);
E.row.chars[linelen] = '\0';
E.numrows = 1;
}
free(line);
fclose(fp);
}
/*** append buffer ***/
struct abuf {
char *b;
int len;
@ -179,7 +217,8 @@ void abFree(struct abuf *ab) {
void editorDrawRows(struct abuf *ab) {
int y;
for (y = 0; y < E.screenrows; y++) {
if (y == E.screenrows / 3) {
if (y >= E.numrows) {
if (E.numrows == 0 && y == E.screenrows / 3) {
char welcome[80];
int welcomelen = snprintf(welcome, sizeof(welcome),
"Kilo editor -- version %s", KILO_VERSION);
@ -194,6 +233,11 @@ void editorDrawRows(struct abuf *ab) {
} else {
abAppend(ab, "~", 1);
}
} else {
int len = E.row.size;
if (len > E.screencols) len = E.screencols;
abAppend(ab, E.row.chars, len);
}
abAppend(ab, "\x1b[K", 3); // Erase one line
if (y < E.screenrows - 1) {
@ -290,14 +334,18 @@ void editorProcessKeypress() {
void initEditor() {
E.cx = 0;
E.cy = 0;
E.numrows = 0;
if (getWindowSize(&E.screenrows, &E.screencols) == -1)
die("getWindowSize");
}
int main() {
int main(int argc, char *argv[]) {
enableRawMode();
initEditor();
if (argc >= 2) {
editorOpen(argv[1]);
}
while (1) {
editorRefreshScreen();