mirror of
https://github.com/eddyem/tty_term.git
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63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/*
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* This file is part of the ttyterm project.
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* Copyright 2020 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h> // getchar
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#include <sys/select.h>
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#include "tty.h"
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static int sec = 0, usec = 100; // timeout
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void settimeout(int tmout){
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sec = 0;
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if(tmout > 999){
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sec = tmout / 1000;
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tmout -= sec * 1000;
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}
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usec = tmout * 1000L;
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}
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int Read_tty(TTY_descr *d){
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if(d->comfd < 0) return 0;
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size_t L = 0;
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ssize_t l;
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size_t length = d->bufsz;
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char *ptr = d->buf;
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fd_set rfds;
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struct timeval tv;
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int retval;
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do{
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l = 0;
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FD_ZERO(&rfds);
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FD_SET(d->comfd, &rfds);
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tv.tv_sec = sec; tv.tv_usec = usec;
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retval = select(d->comfd + 1, &rfds, NULL, NULL, &tv);
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if (!retval) break;
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if(FD_ISSET(d->comfd, &rfds)){
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l = read(d->comfd, ptr, length);
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if(l < 0) return -1;
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if(l == 0) break;
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ptr += l; L += l;
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length -= l;
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}
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}while(l && length);
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d->buflen = L;
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d->buf[L] = 0;
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return (int)L;
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}
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