kernel/kernel/kprint.c

   1 #include <stdint.h>
   2 #include <kprint.h>
   3
   4 void tty_initialize()
   5 {
   6         vga_initialize();
   7 }
   8
   9 void kprint(const char *string, const enum vga_color fg, const enum vga_color bg)
  10 {
  11         char character = *string;
  12         for (int i=1; character; i++) {
  13                 vga_print_char(character, fg, bg);
  14                 character = string[i];
  15         }
  16 }
  17
  18 void kprintc(const char character, const enum vga_color fg, const enum vga_color bg)
  19 {
  20         vga_print_char(character, fg, bg);
  21 }
  22
  23 void kprintnibble(uint8_t nibble)
  24 {
  25         nibble &= 0xf;
  26         if (nibble < 0xa)
  27                 kprintc('0' + nibble, VGA_LIGHT_GRAY, VGA_BLACK);
  28         else kprintc('a' - 0xa + nibble, VGA_LIGHT_GRAY, VGA_BLACK);
  29 }
  30
  31 void kprintb(const uint8_t byte, const int print_delm)
  32 {
  33         if (print_delm)
  34                 kprint("0x", VGA_LIGHT_GRAY, VGA_BLACK);
  35
  36         kprintnibble(byte >> 4);
  37         kprintnibble(byte);
  38 }
  39
  40 void kprintw(const uint16_t word, const int print_delm)
  41 {
  42         if (print_delm)
  43                 kprint("0x", VGA_LIGHT_GRAY, VGA_BLACK);
  44
  45         kprintb(word >> 8, 0);
  46         kprintb(word, 0);
  47 }
  48
  49 void kprintd(const uint32_t dword, const int print_delm)
  50 {
  51         if (print_delm)
  52                 kprint("0x", VGA_LIGHT_GRAY, VGA_BLACK);
  53
  54         kprintw(dword >> 16, 0);
  55         kprintw(dword, 0);
  56 }
  57
  58 void kprintq(const uint64_t qword, const int print_delm)
  59 {
  60         if (print_delm)
  61                 kprint("0x", VGA_LIGHT_GRAY, VGA_BLACK);
  62
  63         kprintd(qword >> 32, 0);
  64         kprintd(qword, 0);
  65 }
  66
  67 int kprintdec(uint32_t num, const enum vga_color fg, const enum vga_color bg)
  68 {
  69         char buffer[11];
  70         int digits = 10;
  71         /* TODO: make an actual memset function to use instead of this */
  72         for (int i=0; i<11; i++) {
  73                 buffer[i] = 0;
  74         }
  75
  76         /* put the numbers in the buffer */
  77         for (int i=9; i>0 && num>0; i--) {
  78                 const uint8_t currdigit = num%10;
  79                 buffer[i] = currdigit+'0';
  80                 num /= 10;
  81         }
  82
  83         /* shift the array as much as needed */
  84         while (*buffer == '\0') {
  85                 digits--;
  86                 for (int i=0; i<9; i++) {
  87                         buffer[i] = buffer[i+1];
  88                 }
  89         }
  90
  91         /* zero out any leftovers */
  92         if (digits < 10) {
  93                 for (int i=digits; i<10; i++) {
  94                         buffer[i] = '\0';
  95                 }
  96         }
  97
  98         kprint(buffer, fg, bg);
  99         return digits;
 100 }