commit 7e6afd353c3a5ffb2e6f7ce3cc6dfac527291f8a
parent ef1ef26738a7bbd4d8e1245306c89daa0e04feef
Author: mjkloeckner <martinjkloeckner@gmail.com>
Date: Sat, 13 May 2023 16:33:59 -0300
handle terminal input during raw mode
Diffstat:
| M | msh.c | | | 131 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- |
1 file changed, 129 insertions(+), 2 deletions(-)
diff --git a/msh.c b/msh.c
@@ -6,8 +6,12 @@
#include <sys/types.h>
#include <sys/wait.h>
+#include <ctype.h>
+
#include "tui.h"
+#define TAB_SIZE 4
+
#define READLINE_BUFFER_INIT_SIZE 128
#define TOKENS_BUFFER_INIT_SIZE 8
#define TOKENS_DELIM " |"
@@ -16,6 +20,11 @@ static bool run = true;
static size_t buffer_alloc;
static size_t tokens_alloc;
+void buffer_print_slice(const char *buf, size_t from, size_t to) {
+ for(size_t i = from; i < to; i++)
+ printf("%c", buf[i]);
+}
+
void buffer_clear(char *buf) {
size_t len = strlen(buf);
for (size_t i = 0; i < len; i++)
@@ -71,6 +80,124 @@ char **buffer_split(char *b, char **t) {
return t;
}
+char *editor_read_line(char *s) {
+ int c;
+ char *aux;
+ size_t line_len, cursor_pos;
+
+ line_len = cursor_pos = 0;
+ while(1) {
+ c = getchar();
+
+ /* Ctrl-D */
+ if((c == 4) || (c == EOF)) {
+ run = false;
+ buffer_clear(s);
+ break;
+ }
+
+ if(c == 3) {
+ buffer_clear(s);
+ break;
+ }
+
+ if((c == '\r') || (c == '\n'))
+ break;
+
+ /* ESC */
+ if(c == 27) {
+ getchar(); /* skip '[' */
+ switch (getchar()) {
+ case 'A': /* up */
+ break;
+ case 'B': /* down */
+ break;
+ case 'D': /* left */
+ if(cursor_pos > 0) {
+ printf("\033[1D");
+ cursor_pos--;
+ }
+ break;
+ case 'C': /* right */
+ if(cursor_pos < line_len) {
+ printf("\033[1C");
+ cursor_pos++;
+ }
+ break;
+ default:
+ break;
+ }
+ continue;
+ }
+
+ /* Backspace */
+ if(c == 0x7f) {
+ if (line_len > 0) {
+ line_len -= 1;
+ cursor_pos -= 1;
+ printf("\b \b");
+ if (cursor_pos < line_len) {
+ memmove(s + cursor_pos, s + cursor_pos + 1, line_len - cursor_pos + 1);
+ buffer_print_slice(s, cursor_pos, line_len);
+ putchar(' ');
+ printf("\033[%ldD", line_len - cursor_pos + 1);
+ }
+ }
+ continue;
+ }
+
+ /* Delete */
+ if(c == 0x7e) {
+ if ((line_len > 0) && (cursor_pos < line_len)) {
+ line_len -= 1;
+ memmove(s + cursor_pos, s + cursor_pos + 1, line_len - cursor_pos);
+ buffer_print_slice(s, cursor_pos, line_len);
+ putchar(' ');
+ printf("\033[%ldD", line_len - cursor_pos + 1);
+ }
+ continue;
+ }
+
+
+ if(c == '\t') {
+ for(size_t i = 0; i < TAB_SIZE; i++)
+ putchar(' ');
+
+ line_len += TAB_SIZE;
+ continue;
+ }
+
+ if(line_len == (buffer_alloc - 1)) {
+ if(!(aux = realloc(s, buffer_alloc += buffer_alloc))) {
+ perror("msh");
+ free(s);
+ return NULL;
+ }
+ s = aux;
+ }
+ if (cursor_pos < line_len) {
+ memmove(s + cursor_pos + 1, s + cursor_pos, line_len - cursor_pos);
+
+ putchar(c);
+ s[cursor_pos++] = c;
+ line_len += 1;
+
+ buffer_print_slice(s, cursor_pos, line_len);
+
+ /* move left the amount buffer_print_slice moved the cursor */
+ printf("\033[%ldD", line_len - cursor_pos);
+ } else {
+ putchar(c);
+ s[line_len++] = c;
+ cursor_pos++;
+ }
+ }
+ printf("\r\n");
+ s[line_len] = '\0';
+ return s;
+}
+
+
void msh_execute(char **argv) {
int status;
pid_t pid;
@@ -110,8 +237,8 @@ void msh_loop(void) {
tui_set_input_mode();
/* make cusor blinking vertical bar */
- printf("\033[5 q$ ");
- buffer = buffer_read_line(buffer);
+ printf("\r\033[5 q$ ");
+ buffer = editor_read_line(buffer);
tui_reset_input_mode();
