[dpdk-dev] [PATCH v2 2/3] cfgfile: use RTE_LOG for errors

[Stephen Hemminger <stephen@networkplumber.org>]

In general, DPDK libraries to not print error messages to
stdout because that is often redirected to /dev/null for daemons.
This patch changes cfgfile library to use RTE_LOG with its
own type.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/librte_cfgfile/Makefile      |  1 +
 lib/librte_cfgfile/rte_cfgfile.c | 38 +++++++++++++++++++++++---------
 2 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/lib/librte_cfgfile/Makefile b/lib/librte_cfgfile/Makefile
index d9512565e559..4fc711778699 100644
--- a/lib/librte_cfgfile/Makefile
+++ b/lib/librte_cfgfile/Makefile
@@ -11,6 +11,7 @@ LIB = librte_cfgfile.a
 CFLAGS += -O3
 CFLAGS += $(WERROR_FLAGS)
 CFLAGS += -I$(SRCDIR)/../librte_eal/common/include
+LDFLAGS += -lrte_log
 
 EXPORT_MAP := rte_cfgfile_version.map
 
diff --git a/lib/librte_cfgfile/rte_cfgfile.c b/lib/librte_cfgfile/rte_cfgfile.c
index 1ef298592fa5..388415147930 100644
--- a/lib/librte_cfgfile/rte_cfgfile.c
+++ b/lib/librte_cfgfile/rte_cfgfile.c
@@ -9,6 +9,7 @@
 #include <errno.h>
 #include <rte_string_fns.h>
 #include <rte_common.h>
+#include <rte_log.h>
 
 #include "rte_cfgfile.h"
 
@@ -26,6 +27,12 @@ struct rte_cfgfile {
 	struct rte_cfgfile_section *sections;
 };
 
+static int cfgfile_logtype;
+
+#define CFG_LOG(level, fmt, args...)					\
+	rte_log(RTE_LOG_ ## level, cfgfile_logtype, "%s(): " fmt "\n",	\
+		__func__, ## args)
+
 /** when we resize a file structure, how many extra entries
  * for new sections do we add in */
 #define CFG_ALLOC_SECTION_BATCH 8
@@ -128,7 +135,7 @@ rte_cfgfile_check_params(const struct rte_cfgfile_parameters *params)
 	unsigned int i;
 
 	if (!params) {
-		printf("Error - missing cfgfile parameters\n");
+		CFG_LOG(ERR, "missing cfgfile parameters\n");
 		return -EINVAL;
 	}
 
@@ -141,7 +148,7 @@ rte_cfgfile_check_params(const struct rte_cfgfile_parameters *params)
 	}
 
 	if (valid_comment == 0)	{
-		printf("Error - invalid comment characters %c\n",
+		CFG_LOG(ERR, "invalid comment characters %c\n",
 		       params->comment_character);
 		return -ENOTSUP;
 	}
@@ -178,7 +185,7 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 		size_t len = strnlen(buffer, sizeof(buffer));
 		lineno++;
 		if ((len >= sizeof(buffer) - 1) && (buffer[len-1] != '\n')) {
-			printf("Error line %d - no \\n found on string. "
+			CFG_LOG(ERR, " line %d - no \\n found on string. "
 					"Check if line too long\n", lineno);
 			goto error1;
 		}
@@ -198,8 +205,9 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 			/* section heading line */
 			char *end = memchr(buffer, ']', len);
 			if (end == NULL) {
-				printf("Error line %d - no terminating ']'"
-					"character found\n", lineno);
+				CFG_LOG(ERR,
+					"line %d - no terminating ']' character found\n",
+					lineno);
 				goto error1;
 			}
 			*end = '\0';
@@ -213,8 +221,9 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 			split[0] = buffer;
 			split[1] = memchr(buffer, '=', len);
 			if (split[1] == NULL) {
-				printf("Error line %d - no '='"
-					"character found\n", lineno);
+				CFG_LOG(ERR,
+					"line %d - no '=' character found\n",
+					lineno);
 				goto error1;
 			}
 			*split[1] = '\0';
@@ -236,8 +245,9 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 
 			if (!(flags & CFG_FLAG_EMPTY_VALUES) &&
 					(*split[1] == '\0')) {
-				printf("Error at line %d - cannot use empty "
-							"values\n", lineno);
+				CFG_LOG(ERR,
+					"line %d - cannot use empty values\n",
+					lineno);
 				goto error1;
 			}
 
@@ -397,7 +407,8 @@ int rte_cfgfile_set_entry(struct rte_cfgfile *cfg, const char *sectionname,
 				sizeof(curr_section->entries[i].value));
 			return 0;
 		}
-	printf("Error - entry name doesn't exist\n");
+
+	CFG_LOG(ERR, "entry name doesn't exist\n");
 	return -EINVAL;
 }
 
@@ -552,3 +563,10 @@ rte_cfgfile_has_entry(struct rte_cfgfile *cfg, const char *sectionname,
 {
 	return rte_cfgfile_get_entry(cfg, sectionname, entryname) != NULL;
 }
+
+RTE_INIT(cfgfile_init)
+{
+	cfgfile_logtype = rte_log_register("lib.cfgfile");
+	if (cfgfile_logtype >= 0)
+		rte_log_set_level(cfgfile_logtype, RTE_LOG_INFO);
+}
-- 
2.17.1