written by Edward Wang; attach Berkeley specific copyright

[unix-history] / usr / src / usr.bin / window / wwgets.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/

#ifndef lint
static char sccsid[] = "@(#)wwgets.c    3.11 (Berkeley) %G%";
#endif /* not lint */

#include "ww.h"
#include "char.h"

wwgets(buf, n, w)
char *buf;
int n;
register struct ww *w;
{
       register char *p = buf;
       register char c;
       char uc = w->ww_unctrl;

       w->ww_unctrl = 0;
       for (;;) {
               wwcurtowin(w);
               while ((c = wwgetc()) < 0)
                       wwiomux();
               if (c == wwoldtty.ww_sgttyb.sg_erase) {
                       if (p > buf)
                               rub(*--p, w);
               } else if (c == wwoldtty.ww_sgttyb.sg_kill) {
                       while (p > buf)
                               rub(*--p, w);
               } else if (c == wwoldtty.ww_ltchars.t_werasc) {
                       while (--p >= buf && (*p == ' ' || *p == '\t'))
                               rub(*p, w);
                       while (p >= buf && *p != ' ' && *p != '\t')
                               rub(*p--, w);
                       p++;
               } else if (c == '\r' || c == '\n') {
                       break;
               } else {
                       if (p >= buf + n - 1)
                               wwputc(ctrl('g'), w);
                       else
                               wwputs(unctrl(*p++ = c), w);
               }
       }
       *p = 0;
       w->ww_unctrl = uc;
}

static
rub(c, w)
struct ww *w;
{
       register i;

       for (i = strlen(unctrl(c)); --i >= 0;)
               (void) wwwrite(w, "\b \b", 3);
}