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[unix-history] / usr / src / usr.bin / systat / keyboard.c

#ifndef lint
static char sccsid[] = "@(#)keyboard.c  1.5 (Berkeley) %G%";
#endif

/*
* Keyboard input support.
*/

#include "systat.h"
#include <ctype.h>

keyboard()
{
       char ch, line[80];
       int oldmask;

       for (;;) {
               col = 0;
               move(CMDLINE, 0);
               do {
                       refresh();
                       ch = getch() & 0177;
                       if (ch == 0177 && ferror(stdin)) {
                               clearerr(stdin);
                               continue;
                       }
                       if (ch >= 'A' && ch <= 'Z')
                               ch += 'a' - 'A';
                       if (col == 0) {
#define mask(s) (1 << ((s) - 1))
                               if (ch == CTRL(l)) {
                                       oldmask = sigblock(mask(SIGALRM));
                                       wrefresh(curscr);
                                       sigsetmask(oldmask);
                                       continue;
                               }
                               if (ch == CTRL(g)) {
                                       oldmask = sigblock(mask(SIGALRM));
                                       status();
                                       sigsetmask(oldmask);
                                       continue;
                               }
                               if (ch != ':')
                                       continue;
                               move(CMDLINE, 0);
                               clrtoeol();
                       }
                       if (ch == _tty.sg_erase && col > 0) {
                               if (col == 1 && line[0] == ':')
                                       continue;
                               col--;
                               goto doerase;
                       }
                       if (ch == CTRL(w) && col > 0) {
                               while (--col >= 0 && isspace(line[col]))
                                       ;
                               col++;
                               while (--col >= 0 && !isspace(line[col]))
                                       if (col == 0 && line[0] == ':')
                                               break;
                               col++;
                               goto doerase;
                       }
                       if (ch == _tty.sg_kill && col > 0) {
                               col = 0;
                               if (line[0] == ':')
                                       col++;
               doerase:
                               move(CMDLINE, col);
                               clrtoeol();
                               continue;
                       }
                       if (isprint(ch) || ch == ' ') {
                               line[col] = ch;
                               mvaddch(CMDLINE, col, ch);
                               col++;
                       }
               } while (col == 0 || (ch != '\r' && ch != '\n'));
               line[col] = '\0';
               oldmask = sigblock(mask(SIGALRM));
               command(line + 1);
               sigsetmask(oldmask);
       }
       /*NOTREACHED*/
}