Add ability to print numbers in decimal

[nameless-os.git] / kernel / arch / x86 / tty / tty.c

diff --git a/kernel/arch/x86/tty/tty.c b/kernel/arch/x86/tty/tty.c
index 2110a7d003703dc3e0d2f89c483521889e2f33d7..861610dde3bc80b08231cc8cbe745abd96dfd615 100644 (file)
--- a/kernel/arch/x86/tty/tty.c
+++ b/kernel/arch/x86/tty/tty.c
@@ -175,3 +175,38 @@ void kprintq(uint64_t qword)
        temp = qword & 0xF;
        kprintc(hex_chars[temp], VGA_COLOR_LIGHT_GRAY);
 }
+
+int kprintdec(uint32_t num)
+{
+       char buffer[11];
+       int digits = 10;
+       /* TODO: make an actual memset function to use instead of this */
+       for (int i=0; i<11; i++) {
+               buffer[i] = 0;
+       }
+
+       /* put the numbers in the buffer */
+       for (int i=9; i>0 && num>0; i--) {
+               uint8_t currdigit = num%10;
+               buffer[i] = currdigit+'0';
+               num /= 10;
+       }
+
+       /* shift the array as much as needed */
+       while (*buffer == '\0') {
+               digits--;
+               for (int i=0; i<9; i++) {
+                       buffer[i] = buffer[i+1];
+               }
+       }
+
+       /* zero out any leftovers */
+       if (digits < 10) {
+               for (int i=digits; i<10; i++) {
+                       buffer[i] = '\0';
+               }
+       }
+
+       kprint(buffer, 0);
+       return digits;
+}