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Commit | Line | Data |
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f3a3214e LT |
1 | #include "cache.h" |
2 | #include "pkt-line.h" | |
3 | ||
1e4cd68c | 4 | static const char *packet_trace_prefix = "git"; |
bbc30f99 JK |
5 | static const char trace_key[] = "GIT_TRACE_PACKET"; |
6 | ||
7 | void packet_trace_identity(const char *prog) | |
8 | { | |
9 | packet_trace_prefix = xstrdup(prog); | |
10 | } | |
11 | ||
12 | static void packet_trace(const char *buf, unsigned int len, int write) | |
13 | { | |
14 | int i; | |
15 | struct strbuf out; | |
16 | ||
17 | if (!trace_want(trace_key)) | |
18 | return; | |
19 | ||
20 | /* +32 is just a guess for header + quoting */ | |
21 | strbuf_init(&out, len+32); | |
22 | ||
23 | strbuf_addf(&out, "packet: %12s%c ", | |
24 | packet_trace_prefix, write ? '>' : '<'); | |
25 | ||
26 | if ((len >= 4 && !prefixcmp(buf, "PACK")) || | |
27 | (len >= 5 && !prefixcmp(buf+1, "PACK"))) { | |
28 | strbuf_addstr(&out, "PACK ..."); | |
29 | unsetenv(trace_key); | |
30 | } | |
31 | else { | |
32 | /* XXX we should really handle printable utf8 */ | |
33 | for (i = 0; i < len; i++) { | |
34 | /* suppress newlines */ | |
35 | if (buf[i] == '\n') | |
36 | continue; | |
37 | if (buf[i] >= 0x20 && buf[i] <= 0x7e) | |
38 | strbuf_addch(&out, buf[i]); | |
39 | else | |
40 | strbuf_addf(&out, "\\%o", buf[i]); | |
41 | } | |
42 | } | |
43 | ||
44 | strbuf_addch(&out, '\n'); | |
45 | trace_strbuf(trace_key, &out); | |
46 | strbuf_release(&out); | |
47 | } | |
48 | ||
f3a3214e LT |
49 | /* |
50 | * If we buffered things up above (we don't, but we should), | |
51 | * we'd flush it here | |
52 | */ | |
53 | void packet_flush(int fd) | |
54 | { | |
bbc30f99 | 55 | packet_trace("0000", 4, 1); |
cdf4fb8e | 56 | write_or_die(fd, "0000", 4); |
f3a3214e LT |
57 | } |
58 | ||
f5615d24 SP |
59 | void packet_buf_flush(struct strbuf *buf) |
60 | { | |
bbc30f99 | 61 | packet_trace("0000", 4, 1); |
f5615d24 SP |
62 | strbuf_add(buf, "0000", 4); |
63 | } | |
64 | ||
f3a3214e | 65 | #define hex(a) (hexchar[(a) & 15]) |
f5615d24 SP |
66 | static char buffer[1000]; |
67 | static unsigned format_packet(const char *fmt, va_list args) | |
f3a3214e | 68 | { |
f3a3214e | 69 | static char hexchar[] = "0123456789abcdef"; |
f3a3214e LT |
70 | unsigned n; |
71 | ||
f3a3214e | 72 | n = vsnprintf(buffer + 4, sizeof(buffer) - 4, fmt, args); |
f3a3214e LT |
73 | if (n >= sizeof(buffer)-4) |
74 | die("protocol error: impossibly long line"); | |
75 | n += 4; | |
76 | buffer[0] = hex(n >> 12); | |
77 | buffer[1] = hex(n >> 8); | |
78 | buffer[2] = hex(n >> 4); | |
79 | buffer[3] = hex(n); | |
bbc30f99 | 80 | packet_trace(buffer+4, n-4, 1); |
f5615d24 SP |
81 | return n; |
82 | } | |
83 | ||
84 | void packet_write(int fd, const char *fmt, ...) | |
85 | { | |
86 | va_list args; | |
87 | unsigned n; | |
88 | ||
89 | va_start(args, fmt); | |
90 | n = format_packet(fmt, args); | |
91 | va_end(args); | |
cdf4fb8e | 92 | write_or_die(fd, buffer, n); |
f3a3214e LT |
93 | } |
94 | ||
f5615d24 SP |
95 | void packet_buf_write(struct strbuf *buf, const char *fmt, ...) |
96 | { | |
97 | va_list args; | |
98 | unsigned n; | |
99 | ||
100 | va_start(args, fmt); | |
101 | n = format_packet(fmt, args); | |
102 | va_end(args); | |
103 | strbuf_add(buf, buffer, n); | |
104 | } | |
105 | ||
03809429 | 106 | static int safe_read(int fd, void *buffer, unsigned size, int options) |
f3a3214e | 107 | { |
c697ad14 HO |
108 | ssize_t ret = read_in_full(fd, buffer, size); |
109 | if (ret < 0) | |
d824cbba | 110 | die_errno("read error"); |
46284dd1 | 111 | else if (ret < size) { |
03809429 | 112 | if (options & PACKET_READ_GENTLE_ON_EOF) |
46284dd1 HV |
113 | return -1; |
114 | ||
c697ad14 | 115 | die("The remote end hung up unexpectedly"); |
46284dd1 HV |
116 | } |
117 | ||
118 | return ret; | |
f3a3214e LT |
119 | } |
120 | ||
f5615d24 | 121 | static int packet_length(const char *linelen) |
f3a3214e LT |
122 | { |
123 | int n; | |
f5615d24 | 124 | int len = 0; |
f3a3214e | 125 | |
f3a3214e LT |
126 | for (n = 0; n < 4; n++) { |
127 | unsigned char c = linelen[n]; | |
128 | len <<= 4; | |
129 | if (c >= '0' && c <= '9') { | |
130 | len += c - '0'; | |
131 | continue; | |
132 | } | |
133 | if (c >= 'a' && c <= 'f') { | |
134 | len += c - 'a' + 10; | |
135 | continue; | |
136 | } | |
137 | if (c >= 'A' && c <= 'F') { | |
138 | len += c - 'A' + 10; | |
139 | continue; | |
140 | } | |
f5615d24 | 141 | return -1; |
f3a3214e | 142 | } |
f5615d24 SP |
143 | return len; |
144 | } | |
145 | ||
03809429 | 146 | int packet_read(int fd, char *buffer, unsigned size, int options) |
f5615d24 | 147 | { |
46284dd1 | 148 | int len, ret; |
f5615d24 SP |
149 | char linelen[4]; |
150 | ||
03809429 JK |
151 | ret = safe_read(fd, linelen, 4, options); |
152 | if (ret < 0) | |
46284dd1 | 153 | return ret; |
f5615d24 SP |
154 | len = packet_length(linelen); |
155 | if (len < 0) | |
743c4b7b | 156 | die("protocol error: bad line length character: %.4s", linelen); |
bbc30f99 JK |
157 | if (!len) { |
158 | packet_trace("0000", 4, 0); | |
f3a3214e | 159 | return 0; |
bbc30f99 | 160 | } |
f3a3214e LT |
161 | len -= 4; |
162 | if (len >= size) | |
163 | die("protocol error: bad line length %d", len); | |
03809429 JK |
164 | ret = safe_read(fd, buffer, len, options); |
165 | if (ret < 0) | |
46284dd1 | 166 | return ret; |
f3a3214e | 167 | buffer[len] = 0; |
bbc30f99 | 168 | packet_trace(buffer, len, 0); |
f3a3214e LT |
169 | return len; |
170 | } | |
f5615d24 | 171 | |
46284dd1 HV |
172 | int packet_read_line(int fd, char *buffer, unsigned size) |
173 | { | |
03809429 | 174 | return packet_read(fd, buffer, size, 0); |
46284dd1 HV |
175 | } |
176 | ||
f5615d24 SP |
177 | int packet_get_line(struct strbuf *out, |
178 | char **src_buf, size_t *src_len) | |
179 | { | |
180 | int len; | |
181 | ||
182 | if (*src_len < 4) | |
183 | return -1; | |
184 | len = packet_length(*src_buf); | |
185 | if (len < 0) | |
186 | return -1; | |
187 | if (!len) { | |
188 | *src_buf += 4; | |
189 | *src_len -= 4; | |
bbc30f99 | 190 | packet_trace("0000", 4, 0); |
f5615d24 SP |
191 | return 0; |
192 | } | |
193 | if (*src_len < len) | |
194 | return -2; | |
195 | ||
196 | *src_buf += 4; | |
197 | *src_len -= 4; | |
198 | len -= 4; | |
199 | ||
200 | strbuf_add(out, *src_buf, len); | |
201 | *src_buf += len; | |
202 | *src_len -= len; | |
bbc30f99 | 203 | packet_trace(out->buf, out->len, 0); |
f5615d24 SP |
204 | return len; |
205 | } |