fmt: add text2pcap format helper

CMakeLists.txt

@@ -242,6 +242,7 @@ set(SRCS
   src/fmt/regex.c
   src/fmt/str.c
   src/fmt/str_error.c
+  src/fmt/text2pcap.c
   src/fmt/time.c
   src/fmt/unicode.c
 

include/re_fmt.h

@@ -202,3 +202,13 @@ void fmt_param_apply(const struct pl *pl, fmt_param_h *ph, void *arg);
 int utf8_encode(struct re_printf *pf, const char *str);
 int utf8_decode(struct re_printf *pf, const struct pl *pl);
 size_t utf8_byteseq(char u[4], unsigned cp);
+
+
+/* text2pcap */
+struct re_text2pcap {
+	bool in;
+	const struct mbuf *mb;
+	char *id;
+};
+
+int re_text2pcap(struct re_printf *pf, struct re_text2pcap *pcap);

src/fmt/text2pcap.c

@@ -0,0 +1,37 @@
+#include <sys/time.h>
+#include <time.h>
+
+#include <re_types.h>
+#include <re_fmt.h>
+#include <re_mbuf.h>
+
+
+int re_text2pcap(struct re_printf *pf, struct re_text2pcap *pcap)
+{
+	struct timeval tv;
+	time_t t      = time(NULL);
+	struct tm *tm = localtime(&t);
+	char ts[10]   = {0};
+
+	if (!pcap)
+		return EINVAL;
+
+	uint8_t *buf = mbuf_buf(pcap->mb);
+	if (!buf)
+		return EINVAL;
+
+	gettimeofday(&tv, NULL);
+	strftime(ts, sizeof(ts), "%H:%M:%S", tm);
+
+	re_hprintf(pf, "%s %s.%06ld 000000", pcap->in ? "I" : "O", ts,
+		   tv.tv_usec);
+
+	size_t sz = mbuf_get_left(pcap->mb);
+	for (size_t i = 0; i < sz; i++) {
+		re_hprintf(pf, " %02x", buf[i]);
+	}
+
+	re_hprintf(pf, " %s\r\n", pcap->id);
+
+	return 0;
+}

test/fmt.c

@@ -1158,3 +1158,30 @@ int test_fmt_hexdump(void)
 
 	return 0;
 }
+
+
+int test_text2pcap(void)
+{
+	char test[64];
+	struct mbuf *mb;
+	int err = 0;
+
+	mb = mbuf_alloc(1);
+	if (!mb)
+		return ENOMEM;
+
+	mbuf_write_u8(mb, 42);
+	mbuf_write_u8(mb, 23);
+
+	mbuf_set_pos(mb, 0);
+
+	struct re_text2pcap pcap = {.id = "test", .in = true, .mb = mb};
+
+	int ret = re_snprintf(test, sizeof(test), "%H", re_text2pcap, &pcap);
+
+	TEST_EQUALS(37, ret);
+
+out:
+	mem_deref(mb);
+	return err;
+}

test/test.c

@@ -214,6 +214,7 @@ static const struct test tests[] = {
 	TEST(test_sys_getenv),
 	TEST(test_tcp),
 	TEST(test_telev),
+	TEST(test_text2pcap),
 #ifdef USE_TLS
 	TEST(test_tls),
 	TEST(test_tls_ec),

test/test.h

@@ -330,6 +330,7 @@ int test_sys_fs_fopen(void);
 int test_sys_getenv(void);
 int test_tcp(void);
 int test_telev(void);
+int test_text2pcap(void);
 int test_thread(void);
 int test_thread_cnd_timedwait(void);
 int test_tmr_jiffies(void);