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[console] Add a pile of of comments to Con_BufferAddText

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And make tail_line setup a little clearer.
This commit is contained in:
Bill Currie 2022-09-17 14:22:28 +09:00
parent 9a92496662
commit c8c1d2e642
1 changed files with 16 additions and 4 deletions
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20
libs/console/buffer.c
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@ -78,19 +78,27 @@ VISIBLE void
Con_BufferAddText (con_buffer_t *buf, const char *text)
{
con_line_t *cur_line = &buf->lines[buf->cur_line];
con_line_t *tail_line;
size_t len = strlen (text);
byte *pos = cur_line->text + cur_line->len;
// Point to the oldest line in the buffer (first to be dropped when
// the buffer overflows).
con_line_t *tail_line = buf->lines + (buf->cur_line + 1 - buf->num_lines
+ buf->max_lines) % buf->max_lines;
byte *pos = cur_line->text + cur_line->len;
if (pos >= buf->buffer + buf->buffer_size)
pos -= buf->buffer_size;
tail_line = buf->lines + (buf->cur_line + buf->max_lines + 1
- buf->num_lines) % buf->max_lines;
// Limit the appended text to the size of the buffer. The entire buffer
// may be overwritten.
if (len > buf->buffer_size) {
text += len - buf->buffer_size;
len = buf->buffer_size;
}
while (len--) {
// Drop the oldest line if it will be overwritten by the next
// character to be inserted. However, if there is only one line,
// then tail_line is effectively invalid and should not be touched.
// This happens when the buffer is filled with a single line of text.
if (buf->num_lines > 1 && pos == tail_line->text) {
buf->num_lines--;
tail_line->text = 0;
@ -99,10 +107,14 @@ Con_BufferAddText (con_buffer_t *buf, const char *text)
if (tail_line - buf->lines >= buf->max_lines)
tail_line = buf->lines;
}
// Copy character into the buffer, updating the current line length
// (trailing \n is part of the line).
byte c = *pos++ = *text++;
if (pos >= buf->buffer + buf->buffer_size)
pos = buf->buffer;
cur_line->len++;
if (c == '\n') {
if (buf->num_lines < buf->max_lines)
buf->num_lines++;