fmt/text2pcap: add re_text2pcap_trace helper

include/re_fmt.h

@@ -209,7 +209,9 @@ size_t utf8_byteseq(char u[4], unsigned cp);
 struct re_text2pcap {
 	bool in;
 	const struct mbuf *mb;
-	char *id;
+	const char *id;
 };
 
 int re_text2pcap(struct re_printf *pf, struct re_text2pcap *pcap);
+void re_text2pcap_trace(const char *name, const char *id, bool in,
+			const struct mbuf *mb);

src/fmt/text2pcap.c

@@ -6,6 +6,8 @@
 #include <re_types.h>
 #include <re_fmt.h>
 #include <re_mbuf.h>
+#include <re_trace.h>
+#include <re_mem.h>
 
 
 int re_text2pcap(struct re_printf *pf, struct re_text2pcap *pcap)
@@ -29,3 +31,22 @@ int re_text2pcap(struct re_printf *pf, struct re_text2pcap *pcap)
 
 	return 0;
 }
+
+
+void re_text2pcap_trace(const char *name, const char *id, bool in,
+			const struct mbuf *mb)
+{
+	struct re_text2pcap pcap = {.in = in, .mb = mb, .id = id};
+	size_t pcap_buf_sz = (mbuf_get_left(mb) * 3) + 64;
+
+	char *pcap_buf = mem_alloc(pcap_buf_sz, NULL);
+	if (!pcap_buf)
+		return;
+
+	re_snprintf(pcap_buf, pcap_buf_sz, "%H", re_text2pcap, &pcap);
+
+	re_trace_event("pcap", name, 'I', NULL, RE_TRACE_ARG_STRING_COPY,
+		       "pcap", pcap_buf);
+
+	mem_deref(pcap_buf);
+}