| #include "pkt-line.h" |
| #include "sideband.h" |
| |
| /* |
| * Receive multiplexed output stream over git native protocol. |
| * in_stream is the input stream from the remote, which carries data |
| * in pkt_line format with band designator. Demultiplex it into out |
| * and err and return error appropriately. Band #1 carries the |
| * primary payload. Things coming over band #2 is not necessarily |
| * error; they are usually informative message on the standard error |
| * stream, aka "verbose"). A message over band #3 is a signal that |
| * the remote died unexpectedly. A flush() concludes the stream. |
| */ |
| |
| #define PREFIX "remote:" |
| #define SUFFIX "\033[K" /* change to " " if ANSI sequences don't work */ |
| |
| int recv_sideband(const char *me, int in_stream, int out, int err) |
| { |
| unsigned pf = strlen(PREFIX); |
| unsigned sf = strlen(SUFFIX); |
| char buf[pf + LARGE_PACKET_MAX + sf + 1]; |
| memcpy(buf, PREFIX, pf); |
| while (1) { |
| int band, len; |
| len = packet_read_line(in_stream, buf + pf, LARGE_PACKET_MAX); |
| if (len == 0) |
| break; |
| if (len < 1) { |
| len = sprintf(buf, "%s: protocol error: no band designator\n", me); |
| safe_write(err, buf, len); |
| return SIDEBAND_PROTOCOL_ERROR; |
| } |
| band = buf[pf] & 0xff; |
| len--; |
| switch (band) { |
| case 3: |
| buf[pf] = ' '; |
| buf[pf+1+len] = '\n'; |
| safe_write(err, buf, pf+1+len+1); |
| return SIDEBAND_REMOTE_ERROR; |
| case 2: |
| buf[pf] = ' '; |
| len += pf+1; |
| while (1) { |
| int brk = pf+1; |
| |
| /* Break the buffer into separate lines. */ |
| while (brk < len) { |
| brk++; |
| if (buf[brk-1] == '\n' || |
| buf[brk-1] == '\r') |
| break; |
| } |
| |
| /* |
| * Let's insert a suffix to clear the end |
| * of the screen line, but only if current |
| * line data actually contains something. |
| */ |
| if (brk > pf+1 + 1) { |
| char save[sf]; |
| memcpy(save, buf + brk, sf); |
| buf[brk + sf - 1] = buf[brk - 1]; |
| memcpy(buf + brk - 1, SUFFIX, sf); |
| safe_write(err, buf, brk + sf); |
| memcpy(buf + brk, save, sf); |
| } else |
| safe_write(err, buf, brk); |
| |
| if (brk < len) { |
| memmove(buf + pf+1, buf + brk, len - brk); |
| len = len - brk + pf+1; |
| } else |
| break; |
| } |
| continue; |
| case 1: |
| safe_write(out, buf + pf+1, len); |
| continue; |
| default: |
| len = sprintf(buf, |
| "%s: protocol error: bad band #%d\n", |
| me, band); |
| safe_write(err, buf, len); |
| return SIDEBAND_PROTOCOL_ERROR; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * fd is connected to the remote side; send the sideband data |
| * over multiplexed packet stream. |
| */ |
| ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max) |
| { |
| ssize_t ssz = sz; |
| const char *p = data; |
| |
| while (sz) { |
| unsigned n; |
| char hdr[5]; |
| |
| n = sz; |
| if (packet_max - 5 < n) |
| n = packet_max - 5; |
| sprintf(hdr, "%04x", n + 5); |
| hdr[4] = band; |
| safe_write(fd, hdr, 5); |
| safe_write(fd, p, n); |
| p += n; |
| sz -= n; |
| } |
| return ssz; |
| } |