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54 lines
1000 B
54 lines
1000 B
7 years ago
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#include "term.h"
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#include <termios.h>
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#include <unistd.h>
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#include <poll.h>
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#include <signal.h>
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#include <stdlib.h>
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class canonical_termios_t
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{
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public:
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canonical_termios_t()
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: restore_tios(false)
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{
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if (tcgetattr(0, &old_tios) == 0)
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{
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struct termios new_tios = old_tios;
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new_tios.c_lflag &= ~(ICANON | ECHO);
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if (tcsetattr(0, TCSANOW, &new_tios) == 0)
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restore_tios = true;
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}
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}
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~canonical_termios_t()
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{
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if (restore_tios)
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tcsetattr(0, TCSANOW, &old_tios);
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}
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private:
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struct termios old_tios;
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bool restore_tios;
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};
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static canonical_termios_t tios; // exit() will clean up for us
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int canonical_terminal_t::read()
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{
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struct pollfd pfd;
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pfd.fd = 0;
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pfd.events = POLLIN;
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int ret = poll(&pfd, 1, 0);
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if (ret <= 0 || !(pfd.revents & POLLIN))
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return -1;
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unsigned char ch;
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ret = ::read(0, &ch, 1);
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return ret <= 0 ? -1 : ch;
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}
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void canonical_terminal_t::write(char ch)
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{
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if (::write(1, &ch, 1) != 1)
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abort();
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}
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