Andrew's git / gitweb.git /
1b14ff88924668e6803229d4d2cef981823522fb
   1#include "pkt-line.h"
   2#include "sideband.h"
   3
   4/*
   5 * Receive multiplexed output stream over git native protocol.
   6 * in_stream is the input stream from the remote, which carries data
   7 * in pkt_line format with band designator.  Demultiplex it into out
   8 * and err and return error appropriately.  Band #1 carries the
   9 * primary payload.  Things coming over band #2 is not necessarily
  10 * error; they are usually informative message on the standard error
  11 * stream, aka "verbose").  A message over band #3 is a signal that
  12 * the remote died unexpectedly.  A flush() concludes the stream.
  13 */
  14int recv_sideband(const char *me, int in_stream, int out, int err, char *buf, int bufsz)
  15{
  16        while (1) {
  17                int len = packet_read_line(in_stream, buf, bufsz);
  18                if (len == 0)
  19                        break;
  20                if (len < 1) {
  21                        len = sprintf(buf, "%s: protocol error: no band designator\n", me);
  22                        safe_write(err, buf, len);
  23                        return SIDEBAND_PROTOCOL_ERROR;
  24                }
  25                len--;
  26                switch (buf[0] & 0xFF) {
  27                case 3:
  28                        safe_write(err, "remote: ", 8);
  29                        safe_write(err, buf+1, len);
  30                        safe_write(err, "\n", 1);
  31                        return SIDEBAND_REMOTE_ERROR;
  32                case 2:
  33                        safe_write(err, "remote: ", 8);
  34                        safe_write(err, buf+1, len);
  35                        continue;
  36                case 1:
  37                        safe_write(out, buf+1, len);
  38                        continue;
  39                default:
  40                        len = sprintf(buf + 1,
  41                                      "%s: protocol error: bad band #%d\n",
  42                                      me, buf[0] & 0xFF);
  43                        safe_write(err, buf+1, len);
  44                        return SIDEBAND_PROTOCOL_ERROR;
  45                }
  46        }
  47        return 0;
  48}
  49
  50/*
  51 * fd is connected to the remote side; send the sideband data
  52 * over multiplexed packet stream.
  53 */
  54ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max)
  55{
  56        ssize_t ssz = sz;
  57        const char *p = data;
  58
  59        while (sz) {
  60                unsigned n;
  61                char hdr[5];
  62
  63                n = sz;
  64                if (packet_max - 5 < n)
  65                        n = packet_max - 5;
  66                sprintf(hdr, "%04x", n + 5);
  67                hdr[4] = band;
  68                safe_write(fd, hdr, 5);
  69                safe_write(fd, p, n);
  70                p += n;
  71                sz -= n;
  72        }
  73        return ssz;
  74}