[PATCH v7 02/10] pkt-line: extract set_packet_header()

[larsxschneider]

From: Lars Schneider <larsxschnei...@gmail.com>

set_packet_header() converts an integer to a 4 byte hex string. Make
this function locally available so that other pkt-line functions can
use it.

Signed-off-by: Lars Schneider <larsxschnei...@gmail.com>
---
 pkt-line.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/pkt-line.c b/pkt-line.c
index 0a9b61c..e8adc0f 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -97,10 +97,20 @@ void packet_buf_flush(struct strbuf *buf)
        strbuf_add(buf, "0000", 4);
 }
 
-#define hex(a) (hexchar[(a) & 15])
-static void format_packet(struct strbuf *out, const char *fmt, va_list args)
+static void set_packet_header(char *buf, const int size)
 {
        static char hexchar[] = "0123456789abcdef";
+
+       #define hex(a) (hexchar[(a) & 15])
+       buf[0] = hex(size >> 12);
+       buf[1] = hex(size >> 8);
+       buf[2] = hex(size >> 4);
+       buf[3] = hex(size);
+       #undef hex
+}
+
+static void format_packet(struct strbuf *out, const char *fmt, va_list args)
+{
        size_t orig_len, n;
 
        orig_len = out->len;
@@ -111,10 +121,7 @@ static void format_packet(struct strbuf *out, const char 
*fmt, va_list args)
        if (n > LARGE_PACKET_MAX)
                die("protocol error: impossibly long line");
 
-       out->buf[orig_len + 0] = hex(n >> 12);
-       out->buf[orig_len + 1] = hex(n >> 8);
-       out->buf[orig_len + 2] = hex(n >> 4);
-       out->buf[orig_len + 3] = hex(n);
+       set_packet_header(&out->buf[orig_len], n);
        packet_trace(out->buf + orig_len + 4, n - 4, 1);
 }
 
-- 
2.10.0