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| author | Jiri Slaby <jslaby@suse.cz> | 2020-08-18 11:57:02 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-18 14:45:21 +0300 |
| commit | 0f66eee346c1672bdb538031a5fe03ea1e0c626f (patch) | |
| tree | 6d51a4432c676c4b0b8e6277aa5625144e8effd3 /drivers/tty/vt/vc_screen.c | |
| parent | 6d507c75e0cd359e4cede48230fb7e7a45c9bb74 (diff) | |
| download | linux-0f66eee346c1672bdb538031a5fe03ea1e0c626f.tar.xz | |
vc_screen: extract vcs_read_buf_uni
The same as making write more readable, extract unicode handling from
vcs_read. The other two cases (w/ and w/o attributes) will follow.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200818085706.12163-12-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/vt/vc_screen.c')
| -rw-r--r-- | drivers/tty/vt/vc_screen.c | 49 |
1 files changed, 30 insertions, 19 deletions
diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c index 8ebb6724a804..91d2e0148a67 100644 --- a/drivers/tty/vt/vc_screen.c +++ b/drivers/tty/vt/vc_screen.c @@ -249,6 +249,33 @@ static loff_t vcs_lseek(struct file *file, loff_t offset, int orig) return fixed_size_llseek(file, offset, orig, size); } +static int vcs_read_buf_uni(struct vc_data *vc, char *con_buf, + unsigned int pos, unsigned int count, bool viewed) +{ + unsigned int nr, row, col, maxcol = vc->vc_cols; + int ret; + + ret = vc_uniscr_check(vc); + if (ret) + return ret; + + pos /= 4; + row = pos / maxcol; + col = pos % maxcol; + nr = maxcol - col; + do { + if (nr > count / 4) + nr = count / 4; + vc_uniscr_copy_line(vc, con_buf, viewed, row, col, nr); + con_buf += nr * 4; + count -= nr * 4; + row++; + col = 0; + nr = maxcol; + } while (count); + + return 0; +} static ssize_t vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) @@ -257,7 +284,7 @@ vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) struct vc_data *vc; struct vcs_poll_data *poll; u16 *org; - unsigned int read, row, col, maxcol; + unsigned int read, col, maxcol; ssize_t ret; char *con_buf; loff_t pos; @@ -327,26 +354,10 @@ vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) orig_count = this_round; maxcol = vc->vc_cols; if (uni_mode) { - unsigned int nr; - - ret = vc_uniscr_check(vc); + ret = vcs_read_buf_uni(vc, con_buf, pos, this_round, + viewed); if (ret) break; - p /= 4; - row = p / vc->vc_cols; - col = p % maxcol; - nr = maxcol - col; - do { - if (nr > this_round/4) - nr = this_round/4; - vc_uniscr_copy_line(vc, con_buf0, viewed, - row, col, nr); - con_buf0 += nr * 4; - this_round -= nr * 4; - row++; - col = 0; - nr = maxcol; - } while (this_round); } else if (!attr) { org = screen_pos(vc, p, viewed); col = p % maxcol; |