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Commit | Line | Data |
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49a52b1d JH |
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 | */ | |
ebe8fa73 NP |
14 | |
15 | #define PREFIX "remote:" | |
0d8aafd2 | 16 | #define SUFFIX "\033[K" /* change to " " if ANSI sequences don't work */ |
ebe8fa73 | 17 | |
9ac13ec9 | 18 | int recv_sideband(const char *me, int in_stream, int out, int err) |
49a52b1d | 19 | { |
ebe8fa73 NP |
20 | unsigned pf = strlen(PREFIX); |
21 | unsigned sf = strlen(SUFFIX); | |
22 | char buf[pf + LARGE_PACKET_MAX + sf + 1]; | |
23 | memcpy(buf, PREFIX, pf); | |
49a52b1d | 24 | while (1) { |
9ac13ec9 | 25 | int band, len; |
ebe8fa73 | 26 | len = packet_read_line(in_stream, buf + pf, LARGE_PACKET_MAX); |
49a52b1d JH |
27 | if (len == 0) |
28 | break; | |
29 | if (len < 1) { | |
30 | len = sprintf(buf, "%s: protocol error: no band designator\n", me); | |
31 | safe_write(err, buf, len); | |
32 | return SIDEBAND_PROTOCOL_ERROR; | |
33 | } | |
ebe8fa73 | 34 | band = buf[pf] & 0xff; |
49a52b1d | 35 | len--; |
9ac13ec9 | 36 | switch (band) { |
49a52b1d | 37 | case 3: |
ebe8fa73 NP |
38 | buf[pf] = ' '; |
39 | buf[pf+1+len] = '\n'; | |
40 | safe_write(err, buf, pf+1+len+1); | |
49a52b1d JH |
41 | return SIDEBAND_REMOTE_ERROR; |
42 | case 2: | |
ebe8fa73 NP |
43 | buf[pf] = ' '; |
44 | len += pf+1; | |
ed1902ef | 45 | while (1) { |
ebe8fa73 NP |
46 | int brk = pf+1; |
47 | ||
48 | /* Break the buffer into separate lines. */ | |
ed1902ef NP |
49 | while (brk < len) { |
50 | brk++; | |
51 | if (buf[brk-1] == '\n' || | |
52 | buf[brk-1] == '\r') | |
53 | break; | |
54 | } | |
ebe8fa73 NP |
55 | |
56 | /* | |
57 | * Let's insert a suffix to clear the end | |
58 | * of the screen line, but only if current | |
59 | * line data actually contains something. | |
60 | */ | |
61 | if (brk > pf+1 + 1) { | |
62 | char save[sf]; | |
63 | memcpy(save, buf + brk, sf); | |
64 | buf[brk + sf - 1] = buf[brk - 1]; | |
65 | memcpy(buf + brk - 1, SUFFIX, sf); | |
66 | safe_write(err, buf, brk + sf); | |
67 | memcpy(buf + brk, save, sf); | |
68 | } else | |
69 | safe_write(err, buf, brk); | |
70 | ||
ed1902ef | 71 | if (brk < len) { |
ebe8fa73 NP |
72 | memmove(buf + pf+1, buf + brk, len - brk); |
73 | len = len - brk + pf+1; | |
ed1902ef NP |
74 | } else |
75 | break; | |
76 | } | |
49a52b1d JH |
77 | continue; |
78 | case 1: | |
ebe8fa73 | 79 | safe_write(out, buf + pf+1, len); |
49a52b1d JH |
80 | continue; |
81 | default: | |
9ac13ec9 | 82 | len = sprintf(buf, |
49a52b1d | 83 | "%s: protocol error: bad band #%d\n", |
9ac13ec9 NP |
84 | me, band); |
85 | safe_write(err, buf, len); | |
49a52b1d JH |
86 | return SIDEBAND_PROTOCOL_ERROR; |
87 | } | |
88 | } | |
89 | return 0; | |
90 | } | |
958c24b1 JH |
91 | |
92 | /* | |
93 | * fd is connected to the remote side; send the sideband data | |
94 | * over multiplexed packet stream. | |
95 | */ | |
96 | ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max) | |
97 | { | |
98 | ssize_t ssz = sz; | |
99 | const char *p = data; | |
100 | ||
101 | while (sz) { | |
102 | unsigned n; | |
103 | char hdr[5]; | |
104 | ||
105 | n = sz; | |
106 | if (packet_max - 5 < n) | |
107 | n = packet_max - 5; | |
108 | sprintf(hdr, "%04x", n + 5); | |
109 | hdr[4] = band; | |
110 | safe_write(fd, hdr, 5); | |
111 | safe_write(fd, p, n); | |
112 | p += n; | |
113 | sz -= n; | |
114 | } | |
115 | return ssz; | |
116 | } |