Add support for timestamps in messages

Add support for printing a timestamp before each message. This can be
configured using the 'timestamp_level' field of the iio_context_params
structure. By default, only messages of the LEVEL_DEBUG log level have
timestamps.

Signed-off-by: Paul Cercueil <[email protected]>

Author: pcercuei

iio-private.h

@@ -237,6 +237,8 @@ extern const struct iio_backend iio_xml_backend;
 extern const struct iio_backend * const iio_backends[];
 extern const unsigned int iio_backends_size;
 
+extern uint64_t library_startup_time_us;
+
 ssize_t iio_xml_print_and_sanitized_param(char *ptr, ssize_t len,
 					  const char *before,
 					  const char *param,

library.c

@@ -9,8 +9,11 @@
 #include "iio-private.h"
 #include <iio-config.h>
 
+uint64_t library_startup_time_us;
+
 static void libiio_init(void)
 {
+	library_startup_time_us = iio_read_counter_us();
 }
 
 static void libiio_exit(void)

utilities.c

@@ -385,6 +385,7 @@ void iio_prm_printf(const struct iio_context_params *params,
 		    const char *fmt, ...)
 {
 	FILE *out = NULL;
+	uint64_t now;
 	va_list ap;
 
 	va_start(ap, fmt);
@@ -398,8 +399,17 @@ void iio_prm_printf(const struct iio_context_params *params,
 		out = msg_level <= LEVEL_WARNING ? stderr : stdout;
 	}
 
-	if (out)
+	if (out) {
+		if (params
+		    && params->timestamp_level > LEVEL_NOLOG
+		    && params->timestamp_level <= msg_level) {
+			now = iio_read_counter_us() - library_startup_time_us;
+			fprintf(out, "(%u.%06us) ", (unsigned int)(now / 1000000),
+				(unsigned int)now % 1000000);
+		}
+
 		vfprintf(out, fmt, ap);
+	}
 
 	va_end(ap);
 }