buf_append
buf_append(b, str, strlen(str));
void buf_append(BUF *, const void *, size_t);
buf_append(bp, buf, len);
buf_append(bp, lp->l_line, lp->l_len);
buf_append(tmpbuf, line->l_line,
buf_append(tmpbuf, end,
buf_append(buf, p, pos);
buf_append(dest, src->elts, src->nelts);
buf_append(buf, str, n + 1);
buf_append(buf, &str, 1);
buf_append(buf, &str, 1);
extern struct Buf *buf_append
buf_append(&m4defs_buf, &m4defs_init_str, 2);
buf_append(&defs_buf, &cpy, 1);
buf_append(b, str, strlen(str));
size_t buf_append(BUF *, const void *, size_t);
buf_append(buf, start, len);
buf_append(diffbuf, str, strlen(str));
buf_append(newbuf, c, kw - c);
buf_append(newbuf, kw, c - kw);
buf_append(newbuf, buf_get(bp), kw - buf_get(bp));
buf_append(newbuf, line, kw - 1 - line);
buf_append(newbuf, line, line2 - line);
buf_append(newbuf, line, kw - 1 - line);
buf_append(newbuf, rdp->rd_log + i, j);
buf_append(newbuf, line, line2 - line);
buf_append(newbuf, c, fin - c);
buf_append(rbuf, rdp->rd_text, len);
buf_append(bp, buf, len);
buf_append(res, lp->l_line, lp->l_len);