#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";
strbuf_release(&out);
}
-/*
- * Write a packetized stream, where each line is preceded by
- * its length (including the header) as a 4-byte hex number.
- * A length of 'zero' means end of stream (and a length of 1-3
- * would be an error).
- *
- * This is all pretty stupid, but we use this packetized line
- * format to make a streaming format possible without ever
- * over-running the read buffers. That way we'll never read
- * into what might be the pack data (which should go to another
- * process entirely).
- *
- * The writing side could use stdio, but since the reading
- * side can't, we stay with pure read/write interfaces.
- */
-ssize_t safe_write(int fd, const void *buf, ssize_t n)
-{
- ssize_t nn = n;
- while (n) {
- int ret = xwrite(fd, buf, n);
- if (ret > 0) {
- buf = (char *) buf + ret;
- n -= ret;
- continue;
- }
- if (!ret)
- die("write error (disk full?)");
- die_errno("write error");
- }
- return nn;
-}
-
/*
* 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);
- safe_write(fd, "0000", 4);
+ write_or_die(fd, "0000", 4);
}
void packet_buf_flush(struct strbuf *buf)
va_start(args, fmt);
n = format_packet(fmt, args);
va_end(args);
- safe_write(fd, buffer, n);
+ write_or_die(fd, buffer, n);
}
void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
strbuf_add(buf, buffer, n);
}
-static int safe_read(int fd, void *buffer, unsigned size, int return_line_fail)
+static int get_packet_data(int fd, char **src_buf, size_t *src_size,
+ void *dst, unsigned size, int options)
{
- ssize_t ret = read_in_full(fd, buffer, size);
- if (ret < 0)
- die_errno("read error");
- else if (ret < size) {
- if (return_line_fail)
+ 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 len;
}
-static int packet_read_internal(int fd, char *buffer, unsigned size, int return_line_fail)
+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 = safe_read(fd, linelen, 4, return_line_fail);
- if (return_line_fail && ret < 0)
+ ret = get_packet_data(fd, src_buf, src_len, linelen, 4, options);
+ if (ret < 0)
return ret;
len = packet_length(linelen);
if (len < 0)
len -= 4;
if (len >= size)
die("protocol error: bad line length %d", len);
- ret = safe_read(fd, buffer, len, return_line_fail);
- if (return_line_fail && ret < 0)
+ 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;
}
-int packet_read(int fd, char *buffer, unsigned size)
+static char *packet_read_line_generic(int fd,
+ char **src, size_t *src_len,
+ int *dst_len)
{
- return packet_read_internal(fd, buffer, size, 1);
+ 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;
}
-int packet_read_line(int fd, char *buffer, unsigned size)
+char *packet_read_line(int fd, int *len_p)
{
- return packet_read_internal(fd, buffer, size, 0);
+ return packet_read_line_generic(fd, NULL, NULL, len_p);
}
-int packet_get_line(struct strbuf *out,
- char **src_buf, size_t *src_len)
+char *packet_read_line_buf(char **src, size_t *src_len, int *dst_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;
+ return packet_read_line_generic(-1, src, src_len, dst_len);
}
projects / git.git / blobdiff