96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
#include <curses.h>
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#include "curspriv.h"
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/****************************************************************/
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/* Newline() does line advance and returns the new cursor line. */
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/* If error, return -1. */
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/****************************************************************/
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_PROTOTYPE( static short newline, (WINDOW *win, int lin));
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static short newline(win, lin)
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WINDOW *win;
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int lin;
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{
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if (++lin > win->_regbottom) {
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lin--;
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if (win->_scroll)
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scroll(win);
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else
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return(-1);
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} /* if */
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return(lin);
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} /* newline */
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/****************************************************************/
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/* Waddch() inserts character 'c' at the current cursor posi- */
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/* Tion in window 'win', and takes any actions as dictated by */
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/* The character. */
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/****************************************************************/
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int waddch(win, c)
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WINDOW *win;
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int c;
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{
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int x = win->_curx;
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int y = win->_cury;
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int newx;
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int ch = c;
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int ts = win->_tabsize;
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ch &= (A_ALTCHARSET | 0xff);
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if (y > win->_maxy || x > win->_maxx || y < 0 || x < 0) return(ERR);
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switch (ch) {
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case '\t':
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for (newx = ((x / ts) + 1) * ts; x < newx; x++) {
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if (waddch(win, ' ') == ERR) return(ERR);
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if (win->_curx == 0) /* if tab to next line */
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return(OK); /* exit the loop */
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}
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return(OK);
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case '\n':
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if (NONL) x = 0;
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if ((y = newline(win, y)) < 0) return (ERR);
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break;
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case '\r': x = 0; break;
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case '\b':
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if (--x < 0) /* no back over left margin */
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x = 0;
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break;
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case 0x7f:
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{
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if (waddch(win, '^') == ERR) return(ERR);
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return(waddch(win, '?'));
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}
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default:
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if (ch < ' ') { /* handle control chars */
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if (waddch(win, '^') == ERR) return(ERR);
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return(waddch(win, c + '@'));
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}
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ch |= (win->_attrs & ATR_MSK);
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if (win->_line[y][x] != ch) { /* only if data change */
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if (win->_minchng[y] == _NO_CHANGE)
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win->_minchng[y] = win->_maxchng[y] = x;
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else if (x < win->_minchng[y])
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win->_minchng[y] = x;
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else if (x > win->_maxchng[y])
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win->_maxchng[y] = x;
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} /* if */
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win->_line[y][x++] = ch;
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if (x > win->_maxx) { /* wrap around test */
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x = 0;
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if ((y = newline(win, y)) < 0) return(ERR);
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}
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break;
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} /* switch */
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win->_curx = x;
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win->_cury = y;
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return(OK);
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}
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