[dpdk-dev] [PATCH v9 14/27] kvargs: add generic string matching callback
Gaetan Rivet
gaetan.rivet at 6wind.com
Wed Jul 4 00:14:57 CEST 2018
This function can be used as a callback to
rte_kvargs_process.
This should reduce code duplication.
Signed-off-by: Gaetan Rivet <gaetan.rivet at 6wind.com>
---
lib/librte_kvargs/rte_kvargs.c | 10 ++++++++++
lib/librte_kvargs/rte_kvargs.h | 28 ++++++++++++++++++++++++++++
lib/librte_kvargs/rte_kvargs_version.map | 1 +
3 files changed, 39 insertions(+)
diff --git a/lib/librte_kvargs/rte_kvargs.c b/lib/librte_kvargs/rte_kvargs.c
index 519f77679..8270d2939 100644
--- a/lib/librte_kvargs/rte_kvargs.c
+++ b/lib/librte_kvargs/rte_kvargs.c
@@ -193,3 +193,13 @@ rte_kvargs_parse2(const char *args, const char * const valid_keys[],
free(copy);
return kvlist;
}
+
+__rte_experimental
+int
+rte_kvargs_strcmp(const char *key __rte_unused,
+ const char *value, void *opaque)
+{
+ const char *str = opaque;
+
+ return -abs(strcmp(str, value));
+}
diff --git a/lib/librte_kvargs/rte_kvargs.h b/lib/librte_kvargs/rte_kvargs.h
index 98c4ed1bf..ac2999ef3 100644
--- a/lib/librte_kvargs/rte_kvargs.h
+++ b/lib/librte_kvargs/rte_kvargs.h
@@ -25,6 +25,8 @@
extern "C" {
#endif
+#include <rte_compat.h>
+
/** Maximum number of key/value associations */
#define RTE_KVARGS_MAX 32
@@ -151,6 +153,32 @@ int rte_kvargs_process(const struct rte_kvargs *kvlist,
unsigned rte_kvargs_count(const struct rte_kvargs *kvlist,
const char *key_match);
+/**
+ * Generic kvarg handler for string comparison.
+ *
+ * This function can be used for a generic string comparison processing
+ * on a list of kvargs.
+ *
+ * @param key
+ * kvarg pair key.
+ *
+ * @param value
+ * kvarg pair value.
+ *
+ * @param opaque
+ * Opaque pointer to a string.
+ *
+ * @return
+ * 0 if the strings match.
+ * !0 otherwise or on error.
+ *
+ * Unless strcmp, comparison ordering is not kept.
+ * In order for rte_kvargs_process to stop processing on match error,
+ * a negative value is returned even if strcmp had returned a positive one.
+ */
+__rte_experimental
+int rte_kvargs_strcmp(const char *key, const char *value, void *opaque);
+
#ifdef __cplusplus
}
#endif
diff --git a/lib/librte_kvargs/rte_kvargs_version.map b/lib/librte_kvargs/rte_kvargs_version.map
index b9fe44b98..6a41a6b65 100644
--- a/lib/librte_kvargs/rte_kvargs_version.map
+++ b/lib/librte_kvargs/rte_kvargs_version.map
@@ -13,5 +13,6 @@ EXPERIMENTAL {
global:
rte_kvargs_parse2;
+ rte_kvargs_strcmp;
} DPDK_2.0;
--
2.11.0
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