[PATCH iproute] devlink: replace print macros with functions

[Stephen Hemminger <stephen@networkplumber.org>]

Using functions is safer than macros, and printing is not performance
critical.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 devlink/devlink.c | 62 ++++++++++++++++++++++++++++++++---------------
 1 file changed, 42 insertions(+), 20 deletions(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index 559f624e3666..4e277f7b0bc3 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -11,6 +11,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
 #include <string.h>
 #include <stdbool.h>
 #include <unistd.h>
@@ -48,32 +49,53 @@
 #define HEALTH_REPORTER_TIMESTAMP_FMT_LEN 80
 
 static int g_new_line_count;
-
-#define pr_err(args...) fprintf(stderr, ##args)
-#define pr_out(args...)						\
-	do {							\
-		if (g_indent_newline) {				\
-			fprintf(stdout, "%s", g_indent_str);	\
-			g_indent_newline = false;		\
-		}						\
-		fprintf(stdout, ##args);			\
-		g_new_line_count = 0;				\
-	} while (0)
-
-#define pr_out_sp(num, args...)					\
-	do {							\
-		int ret = fprintf(stdout, ##args);		\
-		if (ret < num)					\
-			fprintf(stdout, "%*s", num - ret, "");	\
-		g_new_line_count = 0;				\
-	} while (0)
-
 static int g_indent_level;
 static bool g_indent_newline;
+
 #define INDENT_STR_STEP 2
 #define INDENT_STR_MAXLEN 32
 static char g_indent_str[INDENT_STR_MAXLEN + 1] = "";
 
+static void __attribute__((format(printf, 1, 2)))
+pr_err(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+}
+
+static void __attribute__((format(printf, 1, 2)))
+pr_out(const char *fmt, ...)
+{
+	va_list ap;
+
+	if (g_indent_newline) {
+		printf("%s", g_indent_str);
+		g_indent_newline = false;
+	}
+	va_start(ap, fmt);
+	vprintf(fmt, ap);
+	va_end(ap);
+	g_new_line_count = 0;
+}
+
+static void __attribute__((format(printf, 2, 3)))
+pr_out_sp(unsigned int num, const char *fmt, ...)
+{
+	va_list ap;
+	int ret;
+
+	va_start(ap, fmt);
+	ret = vprintf(fmt, ap);
+	va_end(ap);
+
+	if (ret < num)
+		printf("%*s", num - ret, "");
+	g_new_line_count = 0;			\
+}
+
 static void __pr_out_indent_inc(void)
 {
 	if (g_indent_level + INDENT_STR_STEP > INDENT_STR_MAXLEN)
-- 
2.20.1