input: Implement console input handling and add shell for real this time

Self explanatory, we finally have a working ish shell

Now we need to do some more stuff or something, probably work on a fork or something

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

Co-authored-by: Copilot <copilot@github.com>

src/drivers/input/input.c

@@ -5,17 +5,50 @@
 #include <stddef.h>
 #include "mm/memory.h"
 #include "libk/string.h"
+#include <stddef.h>
 
 /* ------------------------------------------------------------------ *
  * Event ring-buffer
  * ------------------------------------------------------------------ */
 #define INPUT_BUF_SIZE 512
+#define CONSOLE_BUF_SIZE 256
+
+static char   s_console_buf[CONSOLE_BUF_SIZE];
+static size_t s_console_rpos = 0;
+static size_t s_console_wpos = 0;
 
 static input_event_t  s_buf[INPUT_BUF_SIZE];
 static size_t         s_rpos = 0;
 static size_t         s_wpos = 0;
 static spinlock_t     s_lock = SPINLOCK_INIT;
 
+/* Called from IRQ context */
+void input_push_char(char c)
+{
+    spinlock_acquire_or_wait(&s_lock);
+    size_t next = (s_console_wpos + 1) % CONSOLE_BUF_SIZE;
+    if (next != s_console_rpos) {               /* drop if full */
+        s_console_buf[s_console_wpos] = c;
+        s_console_wpos = next;
+    }
+    spinlock_drop(&s_lock);
+}
+
+int input_read_console(void *buf, size_t len)
+{
+    uint8_t *p = buf;
+    size_t count = 0;
+
+    spinlock_acquire_or_wait(&s_lock);
+    while (count < len && s_console_rpos != s_console_wpos) {
+        p[count++] = s_console_buf[s_console_rpos];
+        s_console_rpos = (s_console_rpos + 1) % CONSOLE_BUF_SIZE;
+    }
+    spinlock_drop(&s_lock);
+
+    return (int)count;   /* 0 = no data yet (non-blocking) */
+}
+
 static void push_event(const input_event_t *ev)
 {
     spinlock_acquire_or_wait(&s_lock);

src/drivers/input/input.h

@@ -1,6 +1,7 @@
 #pragma once
 #include <stdint.h>
 #include <stdbool.h>
+#include <stddef.h>
 
 /* ------------------------------------------------------------------ *
  * Generic input event types
@@ -53,6 +54,9 @@ void input_push_mouse_rel(int16_t dx, int16_t dy);
 void input_push_mouse_btn(uint8_t button, bool pressed);
 void input_push_mouse_wheel(int8_t delta);
 
+void input_push_char(char c);
+int  input_read_console(void *buf, size_t len);
+
 /* Consumer API */
 bool input_poll(input_event_t *out);  /* non-blocking; false if empty */
 bool input_has_event(void);

src/drivers/input/ps2.c

@@ -6,6 +6,7 @@
 #include "arch/x86_64/sys/ioapic.h"
 #include "arch/x86_64/sys/apic.h"
 #include "libk/stdio.h"
+#include "drivers/video/render.h"
 
 /* ── PS/2 I/O ports ───────────────────────────────────────────────────────── */
 #define PS2_DATA_PORT   0x60    /* Read: scancode / Write: command data */
@@ -150,9 +151,15 @@ void ps2_kbd_handler(Registers *regs)
     /* ── Push event ──────────────────────────────────────────────────── */
     input_push_key(scancode, ascii, pressed);
 
-    /* Optionally echo to debug port for development */
+
     if (pressed && ascii) {
-        /* e9_putc(ascii);  ← uncomment if you have e9 debug output */
+        input_push_char(ascii);
+
+        if (ascii == '\b') {
+            backspace();
+        } else {
+            putchar(ascii);
+        }
     }
 }
 

src/fs/vfs.c

@@ -5,6 +5,7 @@
 #include "libk/stdio.h"
 #include "mm/memory.h"
 #include "libk/string.h"
+#include "drivers/input/input.h"
 
 static spinlock_t s_vfs_lock = SPINLOCK_INIT;
 static vfs_file_t vfs_fd_table[VFS_MAX_FDS];
@@ -111,6 +112,10 @@ int VFS_Read_internal(fd_t fd, uint8_t* buf, size_t size)
     if (fd < 0 || fd >= VFS_MAX_FDS)
         return -1;
 
+    if (fd == VFS_FD_STDIN) {
+        return input_read_console(buf, size);
+    }
+
     vfs_file_t* file = &vfs_fd_table[fd];
 
     if (!file->used)

user/programs/init.c

@@ -1,5 +1,6 @@
 #include "../include/syscalls.h"
 
+#define STDIN    0
 #define STDOUT  1
 
 unsigned strlen(const char* str)
@@ -13,6 +14,64 @@ unsigned strlen(const char* str)
     return len;
 }
 
+static int strcmp(const char* a, const char* b)
+{
+    while (*a && (*a == *b)) {
+        a++;
+        b++;
+    }
+    return *(unsigned char*)a - *(unsigned char*)b;
+}
+
+static void print(const char* s)
+{
+    syscall(SYS_WRITE, STDOUT, (unsigned long)s, strlen(s), 0, 0, 0);
+}
+
+static void readline(char* buf, unsigned long max)
+{
+    unsigned long i = 0;
+
+    while (i < max - 1)
+    {
+        char c;
+        long n = syscall(SYS_READ, STDIN, (unsigned long)&c, 1, 0, 0, 0);
+
+        if (n <= 0)
+            continue;
+
+        if (c == '\n')
+            break;
+
+        if (c == '\b') {
+            if (i > 0) i--;
+            continue;
+        }
+
+        buf[i++] = c;
+    }
+
+    buf[i] = '\0';
+}
+
+static void cat(const char* path)
+{
+    unsigned char buf[256];
+
+    long fd = syscall(SYS_OPEN, (unsigned long)path, 0, 0, 0, 0, 0);
+    if (fd < 0) {
+        print("cat: cannot open file\n");
+        return;
+    }
+
+    long n = syscall(SYS_READ, fd, (unsigned long)buf, sizeof(buf), 0, 0, 0);
+    syscall(SYS_CLOSE, fd, 0, 0, 0, 0, 0);
+
+    if (n > 0)
+        syscall(SYS_WRITE, STDOUT, (unsigned long)buf, n, 0, 0, 0);
+}
+
+
 void main()
 {
     const unsigned char* path = "/qwerty.txt";
@@ -41,6 +100,30 @@ void main()
     // ── print buffer to stdout ───────────────
     syscall(SYS_WRITE, STDOUT, (unsigned long)buf, n, 0, 0, 0);
 
+    char line[128];
+
+    while (1)
+    {
+        print("> ");
+
+        readline(line, sizeof(line));
+
+        if (strcmp(line, "exit") == 0)
+            break;
+
+        // simple "cat <path>"
+        if (line[0] == 'c' && line[1] == 'a' && line[2] == 't' && line[3] == ' ')
+        {
+            cat(&line[4]);
+            continue;
+        }
+
+        if (line[0] != '\0')
+            print("Unknown command\n");
+    }
+
+    while (1);
+
     // ── done ────────────────────────────────
     while (1);
 }