63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/termios_internal.h>
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/*
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* Translate a "termio" structure into a "termios". Ugh.
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*/
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int user_termio_to_kernel_termios(struct ktermios *a_termios, struct termio __user *u_termio)
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{
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struct ktermios *k_termios = (a_termios);
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struct termio k_termio;
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int canon, ret;
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ret = copy_from_user(&k_termio, u_termio, sizeof(k_termio));
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if (!ret) {
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/* Overwrite only the low bits. */
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*(unsigned short *)&k_termios->c_iflag = k_termio.c_iflag;
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*(unsigned short *)&k_termios->c_oflag = k_termio.c_oflag;
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*(unsigned short *)&k_termios->c_cflag = k_termio.c_cflag;
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*(unsigned short *)&k_termios->c_lflag = k_termio.c_lflag;
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canon = k_termio.c_lflag & ICANON;
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k_termios->c_cc[VINTR] = k_termio.c_cc[_VINTR];
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k_termios->c_cc[VQUIT] = k_termio.c_cc[_VQUIT];
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k_termios->c_cc[VERASE] = k_termio.c_cc[_VERASE];
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k_termios->c_cc[VKILL] = k_termio.c_cc[_VKILL];
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k_termios->c_cc[VEOL2] = k_termio.c_cc[_VEOL2];
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k_termios->c_cc[VSWTC] = k_termio.c_cc[_VSWTC];
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k_termios->c_cc[canon ? VEOF : VMIN] = k_termio.c_cc[_VEOF];
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k_termios->c_cc[canon ? VEOL : VTIME] = k_termio.c_cc[_VEOL];
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}
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return ret;
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}
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/*
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* Translate a "termios" structure into a "termio". Ugh.
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*
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* Note the "fun" _VMIN overloading.
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*/
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int kernel_termios_to_user_termio(struct termio __user *u_termio, struct ktermios *a_termios)
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{
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struct ktermios *k_termios = (a_termios);
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struct termio k_termio;
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int canon;
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k_termio.c_iflag = k_termios->c_iflag;
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k_termio.c_oflag = k_termios->c_oflag;
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k_termio.c_cflag = k_termios->c_cflag;
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canon = (k_termio.c_lflag = k_termios->c_lflag) & ICANON;
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k_termio.c_line = k_termios->c_line;
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k_termio.c_cc[_VINTR] = k_termios->c_cc[VINTR];
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k_termio.c_cc[_VQUIT] = k_termios->c_cc[VQUIT];
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k_termio.c_cc[_VERASE] = k_termios->c_cc[VERASE];
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k_termio.c_cc[_VKILL] = k_termios->c_cc[VKILL];
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k_termio.c_cc[_VEOF] = k_termios->c_cc[canon ? VEOF : VMIN];
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k_termio.c_cc[_VEOL] = k_termios->c_cc[canon ? VEOL : VTIME];
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k_termio.c_cc[_VEOL2] = k_termios->c_cc[VEOL2];
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k_termio.c_cc[_VSWTC] = k_termios->c_cc[VSWTC];
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return copy_to_user(u_termio, &k_termio, sizeof(k_termio));
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}
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