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117 lines
2.2 KiB
C
117 lines
2.2 KiB
C
2 years ago
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#include <stdio.h>
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#include <ncurses.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <string.h>
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#include <stdbool.h>
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typedef struct Buffer_struct Buffer;
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struct Buffer_struct {
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char* text;
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char* start;
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char* end;
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int size;
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int gap_size;
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};
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Buffer* new_buffer(int size) {
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Buffer* buffer = malloc(sizeof(Buffer));
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buffer->size = size;
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buffer->text = malloc(buffer->size);
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buffer->gap_size = size;
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buffer->start = buffer->text;
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buffer->end = buffer->start + buffer->gap_size;
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return buffer;
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}
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void buffer_grow(Buffer* buffer) {
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int start_offset = buffer->start - buffer->text;
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buffer->size *= 2;
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buffer->text = realloc(buffer->text,buffer->size);
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buffer->start = buffer->text + start_offset;
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buffer->gap_size = 10;
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for (int i=strlen(buffer->text)-1; i > (buffer->start - buffer->text); i--) {
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*(buffer->text + i + buffer->gap_size) = *(buffer->start + i);
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*(buffer->start + i) = 0;
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}
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buffer->end = buffer->start + buffer->gap_size;
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}
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void buffer_insert(char ch, Buffer* buffer) {
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*(buffer->start) = ch;
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buffer->start++;
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buffer->gap_size--;
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if (buffer->gap_size == 0) {
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buffer_grow(buffer);
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}
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}
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void buffer_right(Buffer* buffer) {
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buffer->start++;
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buffer->end--;
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}
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void buffer_left(Buffer* buffer) {
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buffer->start--;
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buffer->end--;
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}
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void init_curses() {
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initscr();
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noecho();
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keypad(stdscr,TRUE);
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cbreak();
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}
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void sigint_handler(int dummy) {
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endwin();
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exit(130);
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}
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int main() {
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signal(SIGINT,sigint_handler);
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Buffer* buffer = new_buffer(10);
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init_curses();
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int ch;
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while (true) {
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clear();
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int i=0;
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if (buffer->start != buffer->text) { /* We don't want to print the string, if the
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gap starts at the first index of the string */
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while (i < strlen(buffer->text)) {
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addch(*(buffer->text + i));
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i++;
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if ((buffer->start - buffer->text) == i) { /* If we have encountered
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the start of the gap */
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i += buffer->gap_size;
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}
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}
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}
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ch = getch();
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switch(ch) {
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case KEY_BACKSPACE:
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if (buffer->start != buffer->text) {
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buffer->start--;
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buffer->gap_size++;
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}
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goto continue_while_loop;
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default:
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}
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buffer_insert(ch,buffer);
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continue_while_loop:
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}
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endwin();
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}
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