Added __printf() attributes to printf-like functions

kernel/include/kernel.h

@@ -66,7 +66,7 @@
 extern uint8_t console_loglevel;
 
 // TODO: Add a ring buffer for the logs
-int printk(const char* fmt, ...);
+int printk(const char* fmt, ...) __printf(1, 2);
 int vprintk(const char* fmt, va_list ap);
 
 #define pr_emerg(fmt, ...)	printk(KERN_EMERG fmt, ##__VA_ARGS__)
@@ -80,7 +80,7 @@ int vprintk(const char* fmt, va_list ap);
 
 #define PANIC_MSG_BUFSZ	1024
 
-void panic(const char* fmt, ...) __noreturn __cold;
+void panic(const char* fmt, ...) __noreturn __cold __printf(1, 2);
 void vpanic(const char* fmt, va_list ap)__noreturn __cold;
 
 extern uintptr_t __kernel_start, __kernel_text_start, __kernel_rodata_start, __kernel_data_start;

kernel/include/serial.h

@@ -20,7 +20,7 @@ void serial_write(int dev, const char* buf, size_t len);
 void serial_puts(int dev, const char* s);
 void serial_cls(int dev);
 
-int debugf(const char* fmt, ...);
+int debugf(const char* fmt, ...) __printf(1, 2);
 int vdebugf(const char* fmt, va_list args);
 
 #endif

kernel/include/vsnprintf.h

@@ -3,7 +3,7 @@
 
 #include <kernel.h>
 
-int snprintf(char *buf, size_t n, const char *fmt, ...);
+int snprintf(char *buf, size_t n, const char *fmt, ...) __printf(3, 4);
 int vsnprintf(char* buf, size_t n, const char* fmt, va_list ap);
 
 #endif