Fix: fixing push/pull for commit "Initital beggining of a CLI"

stdio.h

@@ -3,13 +3,23 @@
 
 #include "types.h"
 #include <stdarg.h>
-#include <strings.h>
+#include <stddef.h>
 
 #define VGA_WIDTH 80
 #define VGA_HEIGHT 25
 
 #define VGA_MEMORY_ADDRESS 0xB8000
 
+/*
+ * FOR INPUT 
+ */ 
+
+#define KEYBOARD_BUFFER_SIZE 256
+
+static char _keyboard_buffer[KEYBOARD_BUFFER_SIZE];
+static uint16_t _kb_head = 0;
+static uint16_t _kb_tail = 0;
+
 /* IN VGA - Video Memory Arrya:
  * short
  * 1s byte (left most)  -> TEXT COLOR
@@ -343,7 +353,109 @@ void scursor(unsigned int column, unsigned int line) {
     __VGA_set_cursor_internal(column, line);
 }
 
+static inline void __keyboard_buffer_push(char __c) {
+    _keyboard_buffer[_kb_head] = __c;
+    _kb_head = (_kb_head + 1) % KEYBOARD_BUFFER_SIZE;
+}
 
+static inline char __keyboard_buffer_pop() {
+    if (_kb_tail == _kb_head) {
+        return '\0';
+    }
+
+    char __c = _keyboard_buffer[_kb_tail];
+    _kb_tail = (_kb_tail + 1) % KEYBOARD_BUFFER_SIZE;
+    return __c;
+}
+
+static inline char __gets_internal(char *buffer, size_t max_length) {
+    size_t index = 0;
+    char __c;
+
+    while (index < max_length - 1) {
+        __c = __keyboard_buffer_pop();
+        if (__c == '\0') {
+            continue;
+        }
+
+        if (__c == '\n' || __c == '\r') {
+            buffer[index] = '\0';
+            break;
+        }
+
+        buffer[index++] = __c;
+    }
+
+    buffer[index] = '\0';
+    return index;
+}
+
+void gets(char *buffer, size_t max_length) {
+    __gets_internal(buffer, max_length);
+}
+
+static inline int __scanf_internal(const char *fmt, va_list args) {
+
+    char buffer[256];
+    __gets_internal(buffer, sizeof(buffer));
+
+    const char* p = fmt;
+    char* in = buffer;
+
+    int count = 0;
+
+    while (*p) {
+        if (*p == '%') {
+            p++;
+
+            if (*p == 'd') {
+                int* out = va_arg(args, int*);
+                int sign = 1;
+                int value = 0;
+
+                if (*in == '-') { sign = -1; in++; }
+
+                while (*in >= '0' && *in <= '9') {
+                    value = value * 10 + (*in - '0');
+                    in++;
+                }
+
+                *out = value * sign;
+                count++;
+            }
+
+            else if (*p == 's') {
+                char* out = va_arg(args, char*);
+                while (*in == ' ') in++; // skip spaces
+                while (*in && *in != ' ') {
+                    *out++ = *in++;
+                }
+                *out = '\0';
+                count++;
+            }
+
+            else if (*p == 'c') {
+                char* out = va_arg(args, char*);
+                *out = *in++;
+                count++;
+            }
+        }
+
+        p++;
+    }
+
+    va_end(args);
+
+    return count;
+} 
+
+int scanf(const char *fmt, ...) {
+    va_list args;
+    va_start(args, fmt);
+    int result = __scanf_internal(fmt, args);
+    va_end(args);
+    return result;
+}