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video: Add a way to write a partial string to the console

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When writing multiple lines of text we need to be able to control which
text goes on each line. Add a new vidconsole_put_stringn() function to
help with this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-04-02 06:29:40 +13:00
committed by Tom Rini
parent cdd095e48a
commit 8301239ad0
3 changed files with 29 additions and 4 deletions
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13
drivers/video/vidconsole-uclass.c
View File

@@ -508,12 +508,14 @@ int vidconsole_put_char(struct udevice *dev, char ch)
return 0;
}
int vidconsole_put_string(struct udevice *dev, const char *str)
int vidconsole_put_stringn(struct udevice *dev, const char *str, int maxlen)
{
const char *s;
const char *s, *end = NULL;
int ret;
for (s = str; *s; s++) {
if (maxlen != -1)
end = str + maxlen;
for (s = str; *s && (maxlen == -1 || s < end); s++) {
ret = vidconsole_put_char(dev, *s);
if (ret)
return ret;
@@ -522,6 +524,11 @@ int vidconsole_put_string(struct udevice *dev, const char *str)
return 0;
}
int vidconsole_put_string(struct udevice *dev, const char *str)
{
return vidconsole_put_stringn(dev, str, -1);
}
static void vidconsole_putc(struct stdio_dev *sdev, const char ch)
{
struct udevice *dev = sdev->priv;

17
include/video_console.h
View File

@@ -499,6 +499,23 @@ int vidconsole_entry_start(struct udevice *dev);
*/
int vidconsole_put_char(struct udevice *dev, char ch);
/**
* vidconsole_put_stringn() - Output part of a string to the current console pos
*
* Outputs part of a string to the console and advances the cursor. This
* function handles wrapping to new lines and scrolling the console. Special
* characters are handled also: \n, \r, \b and \t.
*
* The device always starts with the cursor at position 0,0 (top left). It
* can be adjusted manually using vidconsole_position_cursor().
*
* @dev: Device to adjust
* @str: String to write
* @maxlen: Maximum chars to output, or -1 for all
* Return: 0 if OK, -ve on error
*/
int vidconsole_put_stringn(struct udevice *dev, const char *str, int maxlen);
/**
* vidconsole_put_string() - Output a string to the current console position
*

3
test/dm/video.c
View File

@@ -607,7 +607,8 @@ static int dm_test_video_truetype(struct unit_test_state *uts)
ut_assertok(video_get_nologo(uts, &dev));
ut_assertok(uclass_get_device(UCLASS_VIDEO_CONSOLE, 0, &con));
vidconsole_put_string(con, test_string);
ut_asserteq(12174, compress_frame_buffer(uts, dev, false));
vidconsole_put_stringn(con, test_string, 30);
ut_asserteq(13184, compress_frame_buffer(uts, dev, false));
ut_assertok(check_copy_frame_buffer(uts, dev));
return 0;