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Fix overrun in oled_write_raw when not at (0, 0) (#13204)

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Jonathan Rascher 2021-06-16 00:30:37 -05:00 committed by GitHub
parent 5c3991cb90
commit 83ee79565c
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1 changed files with 3 additions and 2 deletions
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drivers/oled/oled_driver.c
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@ -491,8 +491,9 @@ void oled_write_raw(const char *data, uint16_t size) {
uint16_t cursor_start_index = oled_cursor - &oled_buffer[0]; uint16_t cursor_start_index = oled_cursor - &oled_buffer[0];
if ((size + cursor_start_index) > OLED_MATRIX_SIZE) size = OLED_MATRIX_SIZE - cursor_start_index; if ((size + cursor_start_index) > OLED_MATRIX_SIZE) size = OLED_MATRIX_SIZE - cursor_start_index;
for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) { for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) {
if (oled_buffer[i] == data[i]) continue; uint8_t c = *data++;
oled_buffer[i] = data[i]; if (oled_buffer[i] == c) continue;
oled_buffer[i] = c;
oled_dirty |= ((OLED_BLOCK_TYPE)1 << (i / OLED_BLOCK_SIZE)); oled_dirty |= ((OLED_BLOCK_TYPE)1 << (i / OLED_BLOCK_SIZE));
} }
} }