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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 | */ | |
14 | ||
15 | #define PREFIX "remote:" | |
16 | ||
17 | #define ANSI_SUFFIX "\033[K" | |
18 | #define DUMB_SUFFIX " " | |
19 | ||
20 | #define FIX_SIZE 10 /* large enough for any of the above */ | |
21 | ||
22 | int recv_sideband(const char *me, int in_stream, int out) | |
23 | { | |
24 | unsigned pf = strlen(PREFIX); | |
25 | unsigned sf; | |
26 | char buf[LARGE_PACKET_MAX + 2*FIX_SIZE]; | |
27 | char *suffix, *term; | |
28 | int skip_pf = 0; | |
29 | ||
30 | memcpy(buf, PREFIX, pf); | |
31 | term = getenv("TERM"); | |
32 | if (term && strcmp(term, "dumb")) | |
33 | suffix = ANSI_SUFFIX; | |
34 | else | |
35 | suffix = DUMB_SUFFIX; | |
36 | sf = strlen(suffix); | |
37 | ||
38 | while (1) { | |
39 | int band, len; | |
40 | len = packet_read_line(in_stream, buf + pf, LARGE_PACKET_MAX); | |
41 | if (len == 0) | |
42 | break; | |
43 | if (len < 1) { | |
44 | fprintf(stderr, "%s: protocol error: no band designator\n", me); | |
45 | return SIDEBAND_PROTOCOL_ERROR; | |
46 | } | |
47 | band = buf[pf] & 0xff; | |
48 | len--; | |
49 | switch (band) { | |
50 | case 3: | |
51 | buf[pf] = ' '; | |
52 | buf[pf+1+len] = '\0'; | |
53 | fprintf(stderr, "%s\n", buf); | |
54 | return SIDEBAND_REMOTE_ERROR; | |
55 | case 2: | |
56 | buf[pf] = ' '; | |
57 | do { | |
58 | char *b = buf; | |
59 | int brk = 0; | |
60 | ||
61 | /* | |
62 | * If the last buffer didn't end with a line | |
63 | * break then we should not print a prefix | |
64 | * this time around. | |
65 | */ | |
66 | if (skip_pf) { | |
67 | b += pf+1; | |
68 | } else { | |
69 | len += pf+1; | |
70 | brk += pf+1; | |
71 | } | |
72 | ||
73 | /* Look for a line break. */ | |
74 | for (;;) { | |
75 | brk++; | |
76 | if (brk > len) { | |
77 | brk = 0; | |
78 | break; | |
79 | } | |
80 | if (b[brk-1] == '\n' || | |
81 | b[brk-1] == '\r') | |
82 | break; | |
83 | } | |
84 | ||
85 | /* | |
86 | * Let's insert a suffix to clear the end | |
87 | * of the screen line if a line break was | |
88 | * found. Also, if we don't skip the | |
89 | * prefix, then a non-empty string must be | |
90 | * present too. | |
91 | */ | |
92 | if (brk > (skip_pf ? 0 : (pf+1 + 1))) { | |
93 | char save[FIX_SIZE]; | |
94 | memcpy(save, b + brk, sf); | |
95 | b[brk + sf - 1] = b[brk - 1]; | |
96 | memcpy(b + brk - 1, suffix, sf); | |
97 | fprintf(stderr, "%.*s", brk + sf, b); | |
98 | memcpy(b + brk, save, sf); | |
99 | len -= brk; | |
100 | } else { | |
101 | int l = brk ? brk : len; | |
102 | fprintf(stderr, "%.*s", l, b); | |
103 | len -= l; | |
104 | } | |
105 | ||
106 | skip_pf = !brk; | |
107 | memmove(buf + pf+1, b + brk, len); | |
108 | } while (len); | |
109 | continue; | |
110 | case 1: | |
111 | safe_write(out, buf + pf+1, len); | |
112 | continue; | |
113 | default: | |
114 | fprintf(stderr, "%s: protocol error: bad band #%d\n", | |
115 | me, band); | |
116 | return SIDEBAND_PROTOCOL_ERROR; | |
117 | } | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
122 | /* | |
123 | * fd is connected to the remote side; send the sideband data | |
124 | * over multiplexed packet stream. | |
125 | */ | |
126 | ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max) | |
127 | { | |
128 | ssize_t ssz = sz; | |
129 | const char *p = data; | |
130 | ||
131 | while (sz) { | |
132 | unsigned n; | |
133 | char hdr[5]; | |
134 | ||
135 | n = sz; | |
136 | if (packet_max - 5 < n) | |
137 | n = packet_max - 5; | |
138 | if (0 <= band) { | |
139 | sprintf(hdr, "%04x", n + 5); | |
140 | hdr[4] = band; | |
141 | safe_write(fd, hdr, 5); | |
142 | } else { | |
143 | sprintf(hdr, "%04x", n + 4); | |
144 | safe_write(fd, hdr, 4); | |
145 | } | |
146 | safe_write(fd, p, n); | |
147 | p += n; | |
148 | sz -= n; | |
149 | } | |
150 | return ssz; | |
151 | } |