These routines help to work with pkt-line values inside of a strbuf,
permitting simple formatting of buffered network messages.
Signed-off-by: Shawn O. Pearce <spearce@xxxxxxxxxxx>
---
pkt-line.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++---------
pkt-line.h | 4 +++
2 files changed, 73 insertions(+), 12 deletions(-)
diff --git a/pkt-line.c b/pkt-line.c
index b691abe..2333d96 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -42,17 +42,19 @@ void packet_flush(int fd)
safe_write(fd, "0000", 4);
}
+void packet_buf_flush(struct strbuf *buf)
+{
+ 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;
@@ -60,9 +62,31 @@ void packet_write(int fd, const char *fmt, ...)
buffer[1] = hex(n >> 8);
buffer[2] = hex(n >> 4);
buffer[3] = hex(n);
+ 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);
@@ -72,15 +96,11 @@ static void safe_read(int fd, void *buffer, unsigned size)
die("The remote end hung up unexpectedly");
}
-int packet_read_line(int fd, char *buffer, unsigned size)
+static int packet_length(unsigned *ret_len, const char *linelen)
{
int n;
- unsigned len;
- char linelen[4];
-
- safe_read(fd, linelen, 4);
+ unsigned len = 0;
- len = 0;
for (n = 0; n < 4; n++) {
unsigned char c = linelen[n];
len <<= 4;
@@ -96,8 +116,20 @@ int packet_read_line(int fd, char *buffer, unsigned size)
len += c - 'A' + 10;
continue;
}
- die("protocol error: bad line length character");
+ return -1;
}
+ *ret_len = len;
+ return 0;
+}
+
+int packet_read_line(int fd, char *buffer, unsigned size)
+{
+ unsigned len;
+ char linelen[4];
+
+ safe_read(fd, linelen, 4);
+ if (packet_length(&len, linelen))
+ die("protocol error: bad line length character");
if (!len)
return 0;
len -= 4;
@@ -107,3 +139,28 @@ int packet_read_line(int fd, char *buffer, unsigned size)
buffer[len] = 0;
return len;
}
+
+int packet_get_line(struct strbuf *out,
+ char **src_buf, size_t *src_len)
+{
+ unsigned len;
+
+ if (*src_len < 4 || packet_length(&len, *src_buf))
+ return -1;
+ if (!len) {
+ *src_buf += 4;
+ *src_len -= 4;
+ 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;
+ return len;
+}
diff --git a/pkt-line.h b/pkt-line.h
index 9df653f..1e5dcfe 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -2,14 +2,18 @@
#define PKTLINE_H
#include "git-compat-util.h"
+#include "strbuf.h"
/*
* Silly packetized line writing interface
*/
void packet_flush(int fd);
void packet_write(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
+void packet_buf_flush(struct strbuf *buf);
+void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
int packet_read_line(int fd, char *buffer, unsigned size);
+int packet_get_line(struct strbuf *out, char **src_buf, size_t *src_len);
ssize_t safe_write(int, const void *, ssize_t);
#endif
--
1.6.5.52.g0ff2e
--
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