6 * Receive multiplexed output stream over git native protocol.
7 * in_stream is the input stream from the remote, which carries data
8 * in pkt_line format with band designator. Demultiplex it into out
9 * and err and return error appropriately. Band #1 carries the
10 * primary payload. Things coming over band #2 is not necessarily
11 * error; they are usually informative message on the standard error
12 * stream, aka "verbose"). A message over band #3 is a signal that
13 * the remote died unexpectedly. A flush() concludes the stream.
16 #define PREFIX "remote:"
18 #define ANSI_SUFFIX "\033[K"
19 #define DUMB_SUFFIX " "
21 #define FIX_SIZE 10 /* large enough for any of the above */
23 int recv_sideband(const char *me, int in_stream, int out)
25 unsigned pf = strlen(PREFIX);
27 char buf[LARGE_PACKET_MAX + 2*FIX_SIZE];
31 memcpy(buf, PREFIX, pf);
32 term = getenv("TERM");
33 if (term && strcmp(term, "dumb"))
41 len = packet_read(in_stream, NULL, NULL, buf + pf, LARGE_PACKET_MAX, 0);
45 fprintf(stderr, "%s: protocol error: no band designator\n", me);
46 return SIDEBAND_PROTOCOL_ERROR;
48 band = buf[pf] & 0xff;
54 fprintf(stderr, "%s\n", buf);
55 return SIDEBAND_REMOTE_ERROR;
63 * If the last buffer didn't end with a line
64 * break then we should not print a prefix
74 /* Look for a line break. */
81 if (b[brk-1] == '\n' ||
87 * Let's insert a suffix to clear the end
88 * of the screen line if a line break was
89 * found. Also, if we don't skip the
90 * prefix, then a non-empty string must be
93 if (brk > (skip_pf ? 0 : (pf+1 + 1))) {
95 memcpy(save, b + brk, sf);
96 b[brk + sf - 1] = b[brk - 1];
97 memcpy(b + brk - 1, suffix, sf);
98 fprintf(stderr, "%.*s", brk + sf, b);
99 memcpy(b + brk, save, sf);
102 int l = brk ? brk : len;
103 fprintf(stderr, "%.*s", l, b);
108 memmove(buf + pf+1, b + brk, len);
112 write_or_die(out, buf + pf+1, len);
115 fprintf(stderr, "%s: protocol error: bad band #%d\n",
117 return SIDEBAND_PROTOCOL_ERROR;
124 * fd is connected to the remote side; send the sideband data
125 * over multiplexed packet stream.
127 ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max)
130 const char *p = data;
137 if (packet_max - 5 < n)
140 sprintf(hdr, "%04x", n + 5);
142 write_or_die(fd, hdr, 5);
144 sprintf(hdr, "%04x", n + 4);
145 write_or_die(fd, hdr, 4);
147 write_or_die(fd, p, n);