From: Gerhard Sittig <redacted>
Date: Sun, 19 Mar 2023 14:57:24 +0000 (+0100)
Subject: log: accept when applications void the log callback
X-Git-Url: http://sigrok.org/gitweb/?p=libsigrok.git;a=commitdiff_plain;h=d4915da66285a2ad324432b7fc28add3bbc70191

log: accept when applications void the log callback

Common support code in the libsigrok library passes all output through
an application specified log callback, while a default callback exists
which writes to stdout and stderr.

Accept when no callback at all is registered. Don't output text in that
case, succeed silently.
---

diff --git a/src/log.c b/src/log.c
index 669d442b..1b01afee 100644
--- a/src/log.c
+++ b/src/log.c
@@ -260,6 +260,10 @@ SR_PRIV int sr_log(int loglevel, const char *format, ...)
 	if (loglevel > cur_loglevel)
 		return SR_OK;
 
+	/* Silently succeed when no logging callback is registered. */
+	if (!sr_log_cb)
+		return SR_OK;
+
 	va_start(args, format);
 	ret = sr_log_cb(sr_log_cb_data, loglevel, format, args);
 	va_end(args);