annotate src/term.c @ 12:eaec918de072
- fixed the scrolling issue
- other minor crap
| author |
John Tsiombikas <nuclear@member.fsf.org> |
| date |
Tue, 22 Feb 2011 18:51:44 +0200 |
| parents |
86781ef20689 |
| children |
06172322fb76 |
| rev |
line source |
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nuclear@4
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1 #include <ctype.h>
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2 #include "term.h"
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3 #include "vid.h"
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4
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5 static int bg, fg = LTGRAY;
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6 static int cursor_x, cursor_y;
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7
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8 /* sets the active text color and returns previous value */
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9 int set_text_color(int c)
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10 {
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11 int prev = fg;
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12
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13 if(c >= 0 && c < 16) {
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14 fg = c;
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15 }
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16 return prev;
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17 }
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18
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19 /* sets the active background color and returns the current value */
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20 int set_back_color(int c)
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21 {
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22 int prev = bg;
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23
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24 if(c >= 0 && c < 16) {
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25 bg = c;
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26 }
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27 return prev;
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28 }
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29
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30 /* output a single character, handles formatting, cursor advancement
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31 * and scrolling the screen when we reach the bottom.
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32 * TODO make visible cursor actually move.
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33 */
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34 int putchar(int c)
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35 {
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36 switch(c) {
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37 case '\n':
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38 cursor_y++;
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39
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40 case '\r':
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41 cursor_x = 0;
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42 break;
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43
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44 case '\b':
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45 cursor_x--;
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46 set_char(' ', cursor_x, cursor_y, fg, bg);
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47 break;
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48
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49 case '\t':
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50 cursor_x = ((cursor_x >> 3) + 1) << 3;
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51 break;
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52
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53 default:
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54 if(isprint(c)) {
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55 set_char(c, cursor_x, cursor_y, fg, bg);
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56 if(++cursor_x >= WIDTH) {
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57 cursor_x = 0;
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58 cursor_y++;
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59 }
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60 }
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61 }
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62
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63 if(cursor_y >= HEIGHT) {
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64 scroll_scr();
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65 cursor_y--;
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66 }
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67
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68 set_cursor(cursor_x, cursor_y);
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69 return c;
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70 }
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