libsigrok/cli: Implement loglevel support.

[libsigrok.git] / log.c

diff --git a/log.c b/log.c
index 22dcc107d020fa0a165834a030baff49bf5a0043..e8cebb1bda544c21cc5f97cd87571b299bb19013 100644 (file)
--- a/log.c
+++ b/log.c
@@ -23,12 +23,49 @@
 #include <sigrok.h>
 #include <sigrok-internal.h>
 
+static int sr_loglevel = SR_LOG_WARN; /* Show errors+warnings per default. */
+
+/**
+ * Set the libsigrok loglevel.
+ *
+ * This influences the amount of log messages (debug messages, error messages,
+ * and so on) libsigrok will output. Using SR_LOG_NONE disables all messages.
+ *
+ * @param loglevel The loglevel to set (SR_LOG_NONE, SR_LOG_ERR, SR_LOG_WARN,
+ *                 SR_LOG_INFO, or SR_LOG_DBG).
+ * @return SR_OK upon success, SR_ERR_ARG upon invalid loglevel.
+ */
+int sr_set_loglevel(int loglevel)
+{
+       if (loglevel < SR_LOG_NONE || loglevel > SR_LOG_DBG) {
+               sr_err("log: %s: invalid loglevel %d", __func__, loglevel);
+               return SR_ERR_ARG;
+       }
+
+       sr_loglevel = loglevel;
+
+       sr_dbg("log: %s: libsigrok loglevel set to %d", __func__, loglevel);
+
+       return SR_OK;
+}
+
+/**
+ * Get the libsigrok loglevel.
+ *
+ * @return The currently configured libsigrok loglevel.
+ */
+int sr_get_loglevel(void)
+{
+       return sr_loglevel;
+}
+
 static int sr_logv(int loglevel, const char *format, va_list args)
 {
        int ret;
 
-       /* Avoid compiler warnings. */
-       loglevel = loglevel;
+       /* Only output messages of at least the selected loglevel(s). */
+       if (loglevel > sr_loglevel)
+               return SR_OK; /* TODO? */
 
        ret = vfprintf(stderr, format, args);
        fprintf(stderr, "\n");