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#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <curses.h>
int main(int argc, char *argv[]) {
char *buffer = 0;
size_t file_size = 0;
if (argc > 1) {
int file_descriptor = open(argv[1], O_RDONLY);
assert(file_descriptor != -1);
struct stat file_stat;
assert(stat(argv[1], &file_stat) != -1);
file_size = file_stat.st_size;
buffer = malloc(file_size);
assert(buffer);
assert(read(file_descriptor, buffer, file_size) != -1);
assert(close(file_descriptor) != -1);
}
initscr();
cbreak();
noecho();
nonl();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
int window_height = getmaxy(stdscr);
int current_line = 0;
int old_line = -1;
int number_of_lines = 0;
for (int i = 0; i < file_size; i++) {
if (buffer[i] == '\n') number_of_lines++;
}
while (1) {
if (old_line != current_line) {
clear();
for (int i = 0, iter_line = 0; i < file_size && iter_line < window_height + current_line; i++) {
if (iter_line >= current_line) addch(buffer[i]);
if (buffer[i] == '\n') iter_line++;
}
}
old_line = current_line;
int input = getch();
switch (input) {
case KEY_UP:
if (current_line > 0) current_line--;
break;
case KEY_DOWN:
if (current_line < number_of_lines - window_height) current_line++;
}
}
endwin();
return 0;
}
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