const char *p;
struct strbuf pattern = STRBUF_INIT;
- strbuf_addf(&pattern, "%c %s", comment_line_char, cut_line);
- p = strstr(buf->buf, pattern.buf);
- if (p && (p == buf->buf || p[-1] == '\n'))
- strbuf_setlen(buf, p - buf->buf);
+ strbuf_addf(&pattern, "\n%c %s", comment_line_char, cut_line);
+ if (starts_with(buf->buf, pattern.buf + 1))
+ strbuf_setlen(buf, 0);
+ else if ((p = strstr(buf->buf, pattern.buf)))
+ strbuf_setlen(buf, p - buf->buf + 1);
strbuf_release(&pattern);
}