diff options
Diffstat (limited to 'slirp/src/sbuf.c')
| -rw-r--r-- | slirp/src/sbuf.c | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/slirp/src/sbuf.c b/slirp/src/sbuf.c deleted file mode 100644 index 9c0b31b513..0000000000 --- a/slirp/src/sbuf.c +++ /dev/null @@ -1,186 +0,0 @@ -/* SPDX-License-Identifier: BSD-3-Clause */ -/* - * Copyright (c) 1995 Danny Gasparovski. - */ - -#include "slirp.h" - -static void sbappendsb(struct sbuf *sb, struct mbuf *m); - -void -sbfree(struct sbuf *sb) -{ - free(sb->sb_data); -} - -bool -sbdrop(struct sbuf *sb, int num) -{ - int limit = sb->sb_datalen / 2; - - /* - * We can only drop how much we have - * This should never succeed - */ - if(num > sb->sb_cc) - num = sb->sb_cc; - sb->sb_cc -= num; - sb->sb_rptr += num; - if(sb->sb_rptr >= sb->sb_data + sb->sb_datalen) - sb->sb_rptr -= sb->sb_datalen; - - if (sb->sb_cc < limit && sb->sb_cc + num >= limit) { - return true; - } - - return false; -} - -void -sbreserve(struct sbuf *sb, int size) -{ - if (sb->sb_data) { - /* Already alloced, realloc if necessary */ - if (sb->sb_datalen != size) { - sb->sb_wptr = sb->sb_rptr = sb->sb_data = (char *)realloc(sb->sb_data, size); - sb->sb_cc = 0; - if (sb->sb_wptr) - sb->sb_datalen = size; - else - sb->sb_datalen = 0; - } - } else { - sb->sb_wptr = sb->sb_rptr = sb->sb_data = (char *)malloc(size); - sb->sb_cc = 0; - if (sb->sb_wptr) - sb->sb_datalen = size; - else - sb->sb_datalen = 0; - } -} - -/* - * Try and write() to the socket, whatever doesn't get written - * append to the buffer... for a host with a fast net connection, - * this prevents an unnecessary copy of the data - * (the socket is non-blocking, so we won't hang) - */ -void -sbappend(struct socket *so, struct mbuf *m) -{ - int ret = 0; - - DEBUG_CALL("sbappend"); - DEBUG_ARG("so = %p", so); - DEBUG_ARG("m = %p", m); - DEBUG_ARG("m->m_len = %d", m->m_len); - - /* Shouldn't happen, but... e.g. foreign host closes connection */ - if (m->m_len <= 0) { - m_free(m); - return; - } - - /* - * If there is urgent data, call sosendoob - * if not all was sent, sowrite will take care of the rest - * (The rest of this function is just an optimisation) - */ - if (so->so_urgc) { - sbappendsb(&so->so_rcv, m); - m_free(m); - (void)sosendoob(so); - return; - } - - /* - * We only write if there's nothing in the buffer, - * ottherwise it'll arrive out of order, and hence corrupt - */ - if (!so->so_rcv.sb_cc) - ret = slirp_send(so, m->m_data, m->m_len, 0); - - if (ret <= 0) { - /* - * Nothing was written - * It's possible that the socket has closed, but - * we don't need to check because if it has closed, - * it will be detected in the normal way by soread() - */ - sbappendsb(&so->so_rcv, m); - } else if (ret != m->m_len) { - /* - * Something was written, but not everything.. - * sbappendsb the rest - */ - m->m_len -= ret; - m->m_data += ret; - sbappendsb(&so->so_rcv, m); - } /* else */ - /* Whatever happened, we free the mbuf */ - m_free(m); -} - -/* - * Copy the data from m into sb - * The caller is responsible to make sure there's enough room - */ -static void -sbappendsb(struct sbuf *sb, struct mbuf *m) -{ - int len, n, nn; - - len = m->m_len; - - if (sb->sb_wptr < sb->sb_rptr) { - n = sb->sb_rptr - sb->sb_wptr; - if (n > len) n = len; - memcpy(sb->sb_wptr, m->m_data, n); - } else { - /* Do the right edge first */ - n = sb->sb_data + sb->sb_datalen - sb->sb_wptr; - if (n > len) n = len; - memcpy(sb->sb_wptr, m->m_data, n); - len -= n; - if (len) { - /* Now the left edge */ - nn = sb->sb_rptr - sb->sb_data; - if (nn > len) nn = len; - memcpy(sb->sb_data,m->m_data+n,nn); - n += nn; - } - } - - sb->sb_cc += n; - sb->sb_wptr += n; - if (sb->sb_wptr >= sb->sb_data + sb->sb_datalen) - sb->sb_wptr -= sb->sb_datalen; -} - -/* - * Copy data from sbuf to a normal, straight buffer - * Don't update the sbuf rptr, this will be - * done in sbdrop when the data is acked - */ -void -sbcopy(struct sbuf *sb, int off, int len, char *to) -{ - char *from; - - from = sb->sb_rptr + off; - if (from >= sb->sb_data + sb->sb_datalen) - from -= sb->sb_datalen; - - if (from < sb->sb_wptr) { - if (len > sb->sb_cc) len = sb->sb_cc; - memcpy(to,from,len); - } else { - /* re-use off */ - off = (sb->sb_data + sb->sb_datalen) - from; - if (off > len) off = len; - memcpy(to,from,off); - len -= off; - if (len) - memcpy(to+off,sb->sb_data,len); - } -} |