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-rw-r--r--payloads/libpayload/drivers/video/video.c26
-rw-r--r--payloads/libpayload/include/libpayload.h9
2 files changed, 33 insertions, 2 deletions
diff --git a/payloads/libpayload/drivers/video/video.c b/payloads/libpayload/drivers/video/video.c
index f183517881..71140f06ba 100644
--- a/payloads/libpayload/drivers/video/video.c
+++ b/payloads/libpayload/drivers/video/video.c
@@ -162,7 +162,8 @@ void video_console_putchar(unsigned int ch)
video_console_fixup_cursor();
}
-void video_printf(int foreground, int background, const char *fmt, ...)
+void video_printf(int foreground, int background, enum video_printf_align align,
+ const char *fmt, ...)
{
int i = 0, len;
char str[200];
@@ -174,6 +175,29 @@ void video_printf(int foreground, int background, const char *fmt, ...)
if (len <= 0)
return;
+ /* vsnprintf can return len larger than size. when it happens,
+ * only size-1 characters have been actually written. */
+ if (len >= ARRAY_SIZE(str))
+ len = ARRAY_SIZE(str) - 1;
+
+ if (len > console->columns) {
+ cursorx = 0;
+ } else {
+ switch (align) {
+ case VIDEO_PRINTF_ALIGN_LEFT:
+ cursorx = 0;
+ break;
+ case VIDEO_PRINTF_ALIGN_CENTER:
+ cursorx = (console->columns - len) / 2;
+ break;
+ case VIDEO_PRINTF_ALIGN_RIGHT:
+ cursorx = console->columns - len;
+ break;
+ default:
+ break;
+ }
+ }
+
foreground &= 0xf;
foreground <<= 8;
background &= 0xf;
diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h
index 3ae3590558..470aafab5a 100644
--- a/payloads/libpayload/include/libpayload.h
+++ b/payloads/libpayload/include/libpayload.h
@@ -210,7 +210,14 @@ void video_console_set_cursor(unsigned int cursorx, unsigned int cursory);
* print characters on video console with colors. note that there is a size
* restriction for the internal buffer. so, output string can be truncated.
*/
-void video_printf(int foreground, int background, const char *fmt, ...);
+enum video_printf_align {
+ VIDEO_PRINTF_ALIGN_KEEP = 0,
+ VIDEO_PRINTF_ALIGN_LEFT,
+ VIDEO_PRINTF_ALIGN_CENTER,
+ VIDEO_PRINTF_ALIGN_RIGHT,
+};
+void video_printf(int foreground, int background, enum video_printf_align align,
+ const char *fmt, ...);
/** @} */
/**