diff options
| -rw-r--r-- | lib/efi_loader/efi_console.c | 62 |
1 files changed, 35 insertions, 27 deletions
diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c index 66c33a551d..8e0965bfc8 100644 --- a/lib/efi_loader/efi_console.c +++ b/lib/efi_loader/efi_console.c @@ -62,6 +62,21 @@ static struct simple_text_output_mode efi_con_mode = { .cursor_visible = 1, }; +static int term_get_char(s32 *c) +{ + u64 timeout; + + /* Wait up to 100 ms for a character */ + timeout = timer_get_us() + 100000; + + while (!tstc()) + if (timer_get_us() > timeout) + return 1; + + *c = getc(); + return 0; +} + /* * Receive and parse a reply from the terminal. * @@ -72,34 +87,36 @@ static struct simple_text_output_mode efi_con_mode = { */ static int term_read_reply(int *n, int num, char end_char) { - char c; + s32 c; int i = 0; - c = getc(); - if (c != cESC) + if (term_get_char(&c) || c != cESC) return -1; - c = getc(); - if (c != '[') + + if (term_get_char(&c) || c != '[') return -1; n[0] = 0; while (1) { - c = getc(); - if (c == ';') { - i++; - if (i >= num) + if (!term_get_char(&c)) { + if (c == ';') { + i++; + if (i >= num) + return -1; + n[i] = 0; + continue; + } else if (c == end_char) { + break; + } else if (c > '9' || c < '0') { return -1; - n[i] = 0; - continue; - } else if (c == end_char) { - break; - } else if (c > '9' || c < '0') { + } + + /* Read one more decimal position */ + n[i] *= 10; + n[i] += c - '0'; + } else { return -1; } - - /* Read one more decimal position */ - n[i] *= 10; - n[i] += c - '0'; } if (i != num - 1) return -1; @@ -196,7 +213,6 @@ static int query_console_serial(int *rows, int *cols) { int ret = 0; int n[2]; - u64 timeout; /* Empty input buffer */ while (tstc()) @@ -216,14 +232,6 @@ static int query_console_serial(int *rows, int *cols) ESC "[999;999H" /* Move to bottom right corner */ ESC "[6n"); /* Query cursor position */ - /* Allow up to one second for a response */ - timeout = timer_get_us() + 1000000; - while (!tstc()) - if (timer_get_us() > timeout) { - ret = -1; - goto out; - } - /* Read {rows,cols} */ if (term_read_reply(n, 2, 'R')) { ret = 1; |