115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/*
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* This file is part of Jehanne.
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*
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* Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, version 3 of the License.
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*
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* Jehanne is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <u.h>
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#include <libc.h>
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#include <envvars.h>
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#include <posix.h>
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#include <reent.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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void
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tty_getsize(struct winsize *size)
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{
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char *var;
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var = jehanne_getenv("LINES");
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if(var != nil){
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size->ws_row = (unsigned short)atoi(var);
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free(var);
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} else {
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size->ws_row = 0;
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}
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var = jehanne_getenv("COLS");
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if(var != nil){
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size->ws_col = (unsigned short)atoi(var);
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free(var);
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} else {
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size->ws_row = 0;
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}
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var = jehanne_getenv("XPIXELS");
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if(var != nil){
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size->ws_xpixel = (unsigned short)atoi(var);
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free(var);
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} else {
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size->ws_row = 0;
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}
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var = jehanne_getenv("YPIXELS");
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if(var != nil){
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size->ws_ypixel = (unsigned short)atoi(var);
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free(var);
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} else {
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size->ws_row = 0;
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}
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}
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int
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tty_setsize(struct winsize *size)
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{
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int fd, i, s, w, h;
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char buf[64];
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struct winsize old;
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if(size->ws_xpixel && size->ws_ypixel){
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PixelSized:
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fd = sys_open("/dev/wctl", OWRITE);
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if(fd < 0)
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return 0;
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i = jehanne_snprint(buf, sizeof(buf), "resize -dx %su -dy %su", size->ws_xpixel, size->ws_ypixel);
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write(fd, buf, i);
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close(fd);
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return 1;
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}
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if(size->ws_row && size->ws_col){
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tty_getsize(&old);
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s = old.ws_xpixel / old.ws_col;
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size->ws_xpixel = (s + 1)*size->ws_col;
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s = old.ws_ypixel / old.ws_row;
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size->ws_ypixel = (s + 1)*size->ws_row;
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goto PixelSized;
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}
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return 0;
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}
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int
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ioctl(int fd, int request, ...)
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{
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va_list ap;
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void *parg;
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int *errnop = &_REENT->_errno;
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if(!POSIX_isatty(errnop, fd))
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return -1;
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va_start(ap, request);
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switch(request){
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case TIOCGWINSZ:
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parg = va_arg(ap, void*);
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tty_getsize(parg);
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break;
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case TIOCSWINSZ:
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parg = va_arg(ap, void*);
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if(!tty_setsize(parg))
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*errnop = EPERM;
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break;
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default:
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break;
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}
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va_end(ap);
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// blatant lie
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return 0;
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}
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