diff options
Diffstat (limited to 'pkt-line.c')
| -rw-r--r-- | pkt-line.c | 143 |
1 files changed, 128 insertions, 15 deletions
@@ -1,6 +1,51 @@ #include "cache.h" #include "pkt-line.h" +static const char *packet_trace_prefix = "git"; +static const char trace_key[] = "GIT_TRACE_PACKET"; + +void packet_trace_identity(const char *prog) +{ + packet_trace_prefix = xstrdup(prog); +} + +static void packet_trace(const char *buf, unsigned int len, int write) +{ + int i; + struct strbuf out; + + if (!trace_want(trace_key)) + return; + + /* +32 is just a guess for header + quoting */ + strbuf_init(&out, len+32); + + strbuf_addf(&out, "packet: %12s%c ", + packet_trace_prefix, write ? '>' : '<'); + + if ((len >= 4 && !prefixcmp(buf, "PACK")) || + (len >= 5 && !prefixcmp(buf+1, "PACK"))) { + strbuf_addstr(&out, "PACK ..."); + unsetenv(trace_key); + } + else { + /* XXX we should really handle printable utf8 */ + for (i = 0; i < len; i++) { + /* suppress newlines */ + if (buf[i] == '\n') + continue; + if (buf[i] >= 0x20 && buf[i] <= 0x7e) + strbuf_addch(&out, buf[i]); + else + strbuf_addf(&out, "\\%o", buf[i]); + } + } + + strbuf_addch(&out, '\n'); + trace_strbuf(trace_key, &out); + strbuf_release(&out); +} + /* * Write a packetized stream, where each line is preceded by * its length (including the header) as a 4-byte hex number. @@ -28,7 +73,7 @@ ssize_t safe_write(int fd, const void *buf, ssize_t n) } if (!ret) die("write error (disk full?)"); - die("write error (%s)", strerror(errno)); + die_errno("write error"); } return nn; } @@ -39,20 +84,24 @@ ssize_t safe_write(int fd, const void *buf, ssize_t n) */ void packet_flush(int fd) { + packet_trace("0000", 4, 1); safe_write(fd, "0000", 4); } +void packet_buf_flush(struct strbuf *buf) +{ + packet_trace("0000", 4, 1); + strbuf_add(buf, "0000", 4); +} + #define hex(a) (hexchar[(a) & 15]) -void packet_write(int fd, const char *fmt, ...) +static char buffer[1000]; +static unsigned format_packet(const char *fmt, va_list args) { - static char buffer[1000]; static char hexchar[] = "0123456789abcdef"; - va_list args; unsigned n; - va_start(args, fmt); n = vsnprintf(buffer + 4, sizeof(buffer) - 4, fmt, args); - va_end(args); if (n >= sizeof(buffer)-4) die("protocol error: impossibly long line"); n += 4; @@ -60,27 +109,46 @@ void packet_write(int fd, const char *fmt, ...) buffer[1] = hex(n >> 8); buffer[2] = hex(n >> 4); buffer[3] = hex(n); + packet_trace(buffer+4, n-4, 1); + return n; +} + +void packet_write(int fd, const char *fmt, ...) +{ + va_list args; + unsigned n; + + va_start(args, fmt); + n = format_packet(fmt, args); + va_end(args); safe_write(fd, buffer, n); } +void packet_buf_write(struct strbuf *buf, const char *fmt, ...) +{ + va_list args; + unsigned n; + + va_start(args, fmt); + n = format_packet(fmt, args); + va_end(args); + strbuf_add(buf, buffer, n); +} + static void safe_read(int fd, void *buffer, unsigned size) { ssize_t ret = read_in_full(fd, buffer, size); if (ret < 0) - die("read error (%s)", strerror(errno)); + die_errno("read error"); else if (ret < size) die("The remote end hung up unexpectedly"); } -int packet_read_line(int fd, char *buffer, unsigned size) +static int packet_length(const char *linelen) { int n; - unsigned len; - char linelen[4]; - - safe_read(fd, linelen, 4); + int len = 0; - len = 0; for (n = 0; n < 4; n++) { unsigned char c = linelen[n]; len <<= 4; @@ -96,14 +164,59 @@ int packet_read_line(int fd, char *buffer, unsigned size) len += c - 'A' + 10; continue; } - die("protocol error: bad line length character"); + return -1; } - if (!len) + return len; +} + +int packet_read_line(int fd, char *buffer, unsigned size) +{ + int len; + char linelen[4]; + + safe_read(fd, linelen, 4); + len = packet_length(linelen); + if (len < 0) + die("protocol error: bad line length character: %.4s", linelen); + if (!len) { + packet_trace("0000", 4, 0); return 0; + } len -= 4; if (len >= size) die("protocol error: bad line length %d", len); safe_read(fd, buffer, len); buffer[len] = 0; + packet_trace(buffer, len, 0); + return len; +} + +int packet_get_line(struct strbuf *out, + char **src_buf, size_t *src_len) +{ + int len; + + if (*src_len < 4) + return -1; + len = packet_length(*src_buf); + if (len < 0) + return -1; + if (!len) { + *src_buf += 4; + *src_len -= 4; + packet_trace("0000", 4, 0); + return 0; + } + if (*src_len < len) + return -2; + + *src_buf += 4; + *src_len -= 4; + len -= 4; + + strbuf_add(out, *src_buf, len); + *src_buf += len; + *src_len -= len; + packet_trace(out->buf, out->len, 0); return len; } |