| 1 | #include <curses.h>
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| 2 | #include "curspriv.h"
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| 3 |
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| 4 | /****************************************************************/
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| 5 | /* Newline() does line advance and returns the new cursor line. */
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| 6 | /* If error, return -1. */
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| 7 | /****************************************************************/
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| 8 |
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| 9 | _PROTOTYPE( static short newline, (WINDOW *win, int lin));
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| 10 |
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| 11 | static short newline(win, lin)
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| 12 | WINDOW *win;
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| 13 | int lin;
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| 14 | {
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| 15 | if (++lin > win->_regbottom) {
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| 16 | lin--;
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| 17 | if (win->_scroll)
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| 18 | scroll(win);
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| 19 | else
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| 20 | return(-1);
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| 21 | } /* if */
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| 22 | return(lin);
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| 23 | } /* newline */
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| 24 |
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| 25 | /****************************************************************/
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| 26 | /* Waddch() inserts character 'c' at the current cursor posi- */
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| 27 | /* Tion in window 'win', and takes any actions as dictated by */
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| 28 | /* The character. */
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| 29 | /****************************************************************/
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| 30 |
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| 31 | int waddch(win, c)
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| 32 | WINDOW *win;
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| 33 | int c;
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| 34 | {
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| 35 | int x = win->_curx;
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| 36 | int y = win->_cury;
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| 37 | int newx;
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| 38 | int ch = c;
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| 39 | int ts = win->_tabsize;
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| 40 |
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| 41 | ch &= (A_ALTCHARSET | 0xff);
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| 42 | if (y > win->_maxy || x > win->_maxx || y < 0 || x < 0) return(ERR);
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| 43 | switch (ch) {
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| 44 | case '\t':
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| 45 | for (newx = ((x / ts) + 1) * ts; x < newx; x++) {
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| 46 | if (waddch(win, ' ') == ERR) return(ERR);
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| 47 | if (win->_curx == 0) /* if tab to next line */
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| 48 | return(OK); /* exit the loop */
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| 49 | }
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| 50 | return(OK);
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| 51 |
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| 52 | case '\n':
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| 53 | if (NONL) x = 0;
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| 54 | if ((y = newline(win, y)) < 0) return (ERR);
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| 55 | break;
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| 56 |
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| 57 | case '\r': x = 0; break;
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| 58 |
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| 59 | case '\b':
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| 60 | if (--x < 0) /* no back over left margin */
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| 61 | x = 0;
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| 62 | break;
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| 63 |
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| 64 | case 0x7f:
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| 65 | {
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| 66 | if (waddch(win, '^') == ERR) return(ERR);
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| 67 | return(waddch(win, '?'));
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| 68 | }
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| 69 |
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| 70 | default:
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| 71 | if (ch < ' ') { /* handle control chars */
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| 72 | if (waddch(win, '^') == ERR) return(ERR);
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| 73 | return(waddch(win, c + '@'));
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| 74 | }
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| 75 | ch |= (win->_attrs & ATR_MSK);
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| 76 | if (win->_line[y][x] != ch) { /* only if data change */
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| 77 | if (win->_minchng[y] == _NO_CHANGE)
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| 78 | win->_minchng[y] = win->_maxchng[y] = x;
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| 79 | else if (x < win->_minchng[y])
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| 80 | win->_minchng[y] = x;
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| 81 | else if (x > win->_maxchng[y])
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| 82 | win->_maxchng[y] = x;
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| 83 | } /* if */
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| 84 | win->_line[y][x++] = ch;
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| 85 | if (x > win->_maxx) { /* wrap around test */
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| 86 | x = 0;
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| 87 | if ((y = newline(win, y)) < 0) return(ERR);
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| 88 | }
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| 89 | break;
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| 90 |
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| 91 | } /* switch */
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| 92 | win->_curx = x;
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| 93 | win->_cury = y;
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| 94 | return(OK);
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| 95 | }
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