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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2016-09-26 14:37:12 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2016-09-26 14:37:12 +0200 |
| commit | 525209ac9465f37a9ba292f1ff138dd80768e869 (patch) | |
| tree | 741d9bef9fd62960e7a7b853bbf7cd98ba2aba40 /libbb/speed_table.c | |
| parent | 4537f83d522086bec8aaa2077f889d8c1c389862 (diff) | |
| download | busybox-525209ac9465f37a9ba292f1ff138dd80768e869.tar.gz | |
libbb/speed_table.c: expand comments
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/speed_table.c')
| -rw-r--r-- | libbb/speed_table.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/libbb/speed_table.c b/libbb/speed_table.c index 13dc9c73a..11ced01d0 100644 --- a/libbb/speed_table.c +++ b/libbb/speed_table.c @@ -103,8 +103,23 @@ static const struct speed_map speeds[] = { {B4000000, 4000000/200 + 0x8000u}, #endif /* 4000000/200 = 0x4e20, bit#15 still does not interfere with the value */ +/* (can use /800 if higher speeds would appear, /1600 won't work for B500000) */ }; +/* + * TODO: maybe we can just bite the bullet, ditch the table and use termios2 + * Linux API (supports arbitrary baud rates, no Bxxxx mess needed)? Example: + * + * #include <asm/termios.h> + * #include <asm/ioctls.h> + * struct termios2 t; + * ioctl(fd, TCGETS2, &t); + * t.c_ospeed = t.c_ispeed = 543210; + * t.c_cflag &= ~CBAUD; + * t.c_cflag |= BOTHER; + * ioctl(fd, TCSETS2, &t); + */ + enum { NUM_SPEEDS = ARRAY_SIZE(speeds) }; unsigned FAST_FUNC tty_baud_to_value(speed_t speed) @@ -114,7 +129,7 @@ unsigned FAST_FUNC tty_baud_to_value(speed_t speed) do { if (speed == speeds[i].speed) { if (speeds[i].value & 0x8000u) { - return ((unsigned long) (speeds[i].value) & 0x7fffU) * 200; + return ((unsigned)(speeds[i].value) & 0x7fffU) * 200; } return speeds[i].value; } |