diff options
Diffstat (limited to 'pkt-line.c')
| -rw-r--r-- | pkt-line.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/pkt-line.c b/pkt-line.c new file mode 100644 index 0000000000..70f19501d0 --- /dev/null +++ b/pkt-line.c @@ -0,0 +1,215 @@ +#include "cache.h" +#include "pkt-line.h" + +char packet_buffer[LARGE_PACKET_MAX]; +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); +} + +/* + * If we buffered things up above (we don't, but we should), + * we'd flush it here + */ +void packet_flush(int fd) +{ + packet_trace("0000", 4, 1); + write_or_die(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]) +static char buffer[1000]; +static unsigned format_packet(const char *fmt, va_list args) +{ + static char hexchar[] = "0123456789abcdef"; + unsigned n; + + n = vsnprintf(buffer + 4, sizeof(buffer) - 4, fmt, args); + if (n >= sizeof(buffer)-4) + die("protocol error: impossibly long line"); + n += 4; + buffer[0] = hex(n >> 12); + 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); + write_or_die(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 int get_packet_data(int fd, char **src_buf, size_t *src_size, + void *dst, unsigned size, int options) +{ + ssize_t ret; + + if (fd >= 0 && src_buf && *src_buf) + die("BUG: multiple sources given to packet_read"); + + /* Read up to "size" bytes from our source, whatever it is. */ + if (src_buf && *src_buf) { + ret = size < *src_size ? size : *src_size; + memcpy(dst, *src_buf, ret); + *src_buf += ret; + *src_size -= ret; + } else { + ret = read_in_full(fd, dst, size); + if (ret < 0) + die_errno("read error"); + } + + /* And complain if we didn't get enough bytes to satisfy the read. */ + if (ret < size) { + if (options & PACKET_READ_GENTLE_ON_EOF) + return -1; + + die("The remote end hung up unexpectedly"); + } + + return ret; +} + +static int packet_length(const char *linelen) +{ + int n; + int len = 0; + + for (n = 0; n < 4; n++) { + unsigned char c = linelen[n]; + len <<= 4; + if (c >= '0' && c <= '9') { + len += c - '0'; + continue; + } + if (c >= 'a' && c <= 'f') { + len += c - 'a' + 10; + continue; + } + if (c >= 'A' && c <= 'F') { + len += c - 'A' + 10; + continue; + } + return -1; + } + return len; +} + +int packet_read(int fd, char **src_buf, size_t *src_len, + char *buffer, unsigned size, int options) +{ + int len, ret; + char linelen[4]; + + ret = get_packet_data(fd, src_buf, src_len, linelen, 4, options); + if (ret < 0) + return ret; + 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); + ret = get_packet_data(fd, src_buf, src_len, buffer, len, options); + if (ret < 0) + return ret; + + if ((options & PACKET_READ_CHOMP_NEWLINE) && + len && buffer[len-1] == '\n') + len--; + + buffer[len] = 0; + packet_trace(buffer, len, 0); + return len; +} + +static char *packet_read_line_generic(int fd, + char **src, size_t *src_len, + int *dst_len) +{ + int len = packet_read(fd, src, src_len, + packet_buffer, sizeof(packet_buffer), + PACKET_READ_CHOMP_NEWLINE); + if (dst_len) + *dst_len = len; + return len ? packet_buffer : NULL; +} + +char *packet_read_line(int fd, int *len_p) +{ + return packet_read_line_generic(fd, NULL, NULL, len_p); +} + +char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len) +{ + return packet_read_line_generic(-1, src, src_len, dst_len); +} |