kern
annotate src/term.c @ 73:b4b7198986a6
fixed a potential null dereference when deleting a bug in the redblack tree
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 15 Oct 2011 08:06:10 +0300 |
| parents | 06172322fb76 |
| children |
| rev | line source |
|---|---|
| nuclear@4 | 1 #include <ctype.h> |
| nuclear@1 | 2 #include "term.h" |
| nuclear@1 | 3 #include "vid.h" |
| nuclear@52 | 4 #include "intr.h" |
| nuclear@1 | 5 |
| nuclear@2 | 6 static int bg, fg = LTGRAY; |
| nuclear@1 | 7 static int cursor_x, cursor_y; |
| nuclear@1 | 8 |
| nuclear@2 | 9 /* sets the active text color and returns previous value */ |
| nuclear@2 | 10 int set_text_color(int c) |
| nuclear@1 | 11 { |
| nuclear@2 | 12 int prev = fg; |
| nuclear@2 | 13 |
| nuclear@1 | 14 if(c >= 0 && c < 16) { |
| nuclear@1 | 15 fg = c; |
| nuclear@1 | 16 } |
| nuclear@2 | 17 return prev; |
| nuclear@1 | 18 } |
| nuclear@1 | 19 |
| nuclear@2 | 20 /* sets the active background color and returns the current value */ |
| nuclear@2 | 21 int set_back_color(int c) |
| nuclear@1 | 22 { |
| nuclear@2 | 23 int prev = bg; |
| nuclear@2 | 24 |
| nuclear@1 | 25 if(c >= 0 && c < 16) { |
| nuclear@1 | 26 bg = c; |
| nuclear@1 | 27 } |
| nuclear@2 | 28 return prev; |
| nuclear@1 | 29 } |
| nuclear@1 | 30 |
| nuclear@2 | 31 /* output a single character, handles formatting, cursor advancement |
| nuclear@2 | 32 * and scrolling the screen when we reach the bottom. |
| nuclear@2 | 33 */ |
| nuclear@1 | 34 int putchar(int c) |
| nuclear@1 | 35 { |
| nuclear@52 | 36 int istate = get_intr_state(); |
| nuclear@52 | 37 disable_intr(); |
| nuclear@52 | 38 |
| nuclear@1 | 39 switch(c) { |
| nuclear@1 | 40 case '\n': |
| nuclear@1 | 41 cursor_y++; |
| nuclear@1 | 42 |
| nuclear@1 | 43 case '\r': |
| nuclear@1 | 44 cursor_x = 0; |
| nuclear@1 | 45 break; |
| nuclear@1 | 46 |
| nuclear@1 | 47 case '\b': |
| nuclear@1 | 48 cursor_x--; |
| nuclear@1 | 49 set_char(' ', cursor_x, cursor_y, fg, bg); |
| nuclear@1 | 50 break; |
| nuclear@1 | 51 |
| nuclear@1 | 52 case '\t': |
| nuclear@1 | 53 cursor_x = ((cursor_x >> 3) + 1) << 3; |
| nuclear@1 | 54 break; |
| nuclear@1 | 55 |
| nuclear@1 | 56 default: |
| nuclear@2 | 57 if(isprint(c)) { |
| nuclear@2 | 58 set_char(c, cursor_x, cursor_y, fg, bg); |
| nuclear@2 | 59 if(++cursor_x >= WIDTH) { |
| nuclear@2 | 60 cursor_x = 0; |
| nuclear@2 | 61 cursor_y++; |
| nuclear@2 | 62 } |
| nuclear@1 | 63 } |
| nuclear@1 | 64 } |
| nuclear@1 | 65 |
| nuclear@1 | 66 if(cursor_y >= HEIGHT) { |
| nuclear@1 | 67 scroll_scr(); |
| nuclear@1 | 68 cursor_y--; |
| nuclear@1 | 69 } |
| nuclear@2 | 70 |
| nuclear@2 | 71 set_cursor(cursor_x, cursor_y); |
| nuclear@52 | 72 |
| nuclear@52 | 73 set_intr_state(istate); |
| nuclear@1 | 74 return c; |
| nuclear@1 | 75 } |