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1 | #include "cache.h" | |
2 | #include "pkt-line.h" | |
3 | #include "sideband.h" | |
4 | ||
5 | /* | |
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. | |
14 | */ | |
15 | ||
16 | #define PREFIX "remote: " | |
17 | ||
18 | #define ANSI_SUFFIX "\033[K" | |
19 | #define DUMB_SUFFIX " " | |
20 | ||
21 | int recv_sideband(const char *me, int in_stream, int out) | |
22 | { | |
23 | const char *term, *suffix; | |
24 | char buf[LARGE_PACKET_MAX + 1]; | |
25 | struct strbuf outbuf = STRBUF_INIT; | |
26 | int retval = 0; | |
27 | ||
28 | term = getenv("TERM"); | |
29 | if (isatty(2) && term && strcmp(term, "dumb")) | |
30 | suffix = ANSI_SUFFIX; | |
31 | else | |
32 | suffix = DUMB_SUFFIX; | |
33 | ||
34 | while (!retval) { | |
35 | const char *b, *brk; | |
36 | int band, len; | |
37 | len = packet_read(in_stream, NULL, NULL, buf, LARGE_PACKET_MAX, 0); | |
38 | if (len == 0) | |
39 | break; | |
40 | if (len < 1) { | |
41 | strbuf_addf(&outbuf, | |
42 | "%s%s: protocol error: no band designator", | |
43 | outbuf.len ? "\n" : "", me); | |
44 | retval = SIDEBAND_PROTOCOL_ERROR; | |
45 | break; | |
46 | } | |
47 | band = buf[0] & 0xff; | |
48 | buf[len] = '\0'; | |
49 | len--; | |
50 | switch (band) { | |
51 | case 3: | |
52 | strbuf_addf(&outbuf, "%s%s%s", outbuf.len ? "\n" : "", | |
53 | PREFIX, buf + 1); | |
54 | retval = SIDEBAND_REMOTE_ERROR; | |
55 | break; | |
56 | case 2: | |
57 | b = buf + 1; | |
58 | ||
59 | /* | |
60 | * Append a suffix to each nonempty line to clear the | |
61 | * end of the screen line. | |
62 | * | |
63 | * The output is accumulated in a buffer and | |
64 | * each line is printed to stderr using | |
65 | * write(2) to ensure inter-process atomicity. | |
66 | */ | |
67 | while ((brk = strpbrk(b, "\n\r"))) { | |
68 | int linelen = brk - b; | |
69 | ||
70 | if (!outbuf.len) | |
71 | strbuf_addstr(&outbuf, PREFIX); | |
72 | if (linelen > 0) { | |
73 | strbuf_addf(&outbuf, "%.*s%s%c", | |
74 | linelen, b, suffix, *brk); | |
75 | } else { | |
76 | strbuf_addch(&outbuf, *brk); | |
77 | } | |
78 | xwrite(2, outbuf.buf, outbuf.len); | |
79 | strbuf_reset(&outbuf); | |
80 | ||
81 | b = brk + 1; | |
82 | } | |
83 | ||
84 | if (*b) | |
85 | strbuf_addf(&outbuf, "%s%s", | |
86 | outbuf.len ? "" : PREFIX, b); | |
87 | break; | |
88 | case 1: | |
89 | write_or_die(out, buf + 1, len); | |
90 | break; | |
91 | default: | |
92 | strbuf_addf(&outbuf, "%s%s: protocol error: bad band #%d", | |
93 | outbuf.len ? "\n" : "", me, band); | |
94 | retval = SIDEBAND_PROTOCOL_ERROR; | |
95 | break; | |
96 | } | |
97 | } | |
98 | ||
99 | if (outbuf.len) { | |
100 | strbuf_addch(&outbuf, '\n'); | |
101 | xwrite(2, outbuf.buf, outbuf.len); | |
102 | } | |
103 | strbuf_release(&outbuf); | |
104 | return retval; | |
105 | } | |
106 | ||
107 | /* | |
108 | * fd is connected to the remote side; send the sideband data | |
109 | * over multiplexed packet stream. | |
110 | */ | |
111 | void send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max) | |
112 | { | |
113 | const char *p = data; | |
114 | ||
115 | while (sz) { | |
116 | unsigned n; | |
117 | char hdr[5]; | |
118 | ||
119 | n = sz; | |
120 | if (packet_max - 5 < n) | |
121 | n = packet_max - 5; | |
122 | if (0 <= band) { | |
123 | xsnprintf(hdr, sizeof(hdr), "%04x", n + 5); | |
124 | hdr[4] = band; | |
125 | write_or_die(fd, hdr, 5); | |
126 | } else { | |
127 | xsnprintf(hdr, sizeof(hdr), "%04x", n + 4); | |
128 | write_or_die(fd, hdr, 4); | |
129 | } | |
130 | write_or_die(fd, p, n); | |
131 | p += n; | |
132 | sz -= n; | |
133 | } | |
134 | } |