cfgfile: add section number of entries by index

rte_cfgfile_section_num_entries_by_index() is added to get the number of
entries of a section when multiple sections of the same name are
present.

Signed-off-by: Guduri Prathyusha <gprathyusha@caviumnetworks.com>
Reviewed-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

lib/librte_cfgfile/rte_cfgfile.c

@@ -408,7 +408,20 @@ rte_cfgfile_section_num_entries(struct rte_cfgfile *cfg,
 	return s->num_entries;
 }
 
+int
+rte_cfgfile_section_num_entries_by_index(struct rte_cfgfile *cfg,
+	char *sectionname, int index)
+{
+	const struct rte_cfgfile_section *sect;
 
+	if (index < 0 || index >= cfg->num_sections)
+		return -1;
+
+	sect = cfg->sections[index];
+	snprintf(sectionname, CFG_NAME_LEN, "%s", sect->name);
+
+	return sect->num_entries;
+}
 int
 rte_cfgfile_section_entries(struct rte_cfgfile *cfg, const char *sectionname,
 		struct rte_cfgfile_entry *entries, int max_entries)

lib/librte_cfgfile/rte_cfgfile.h

@@ -183,6 +183,26 @@ int rte_cfgfile_has_section(struct rte_cfgfile *cfg, const char *sectionname);
 int rte_cfgfile_section_num_entries(struct rte_cfgfile *cfg,
 	const char *sectionname);
 
+/**
+* Get number of entries in given config file section
+*
+* The index of a section is the same as the index of its name in the
+* result of rte_cfgfile_sections. This API can be used when there are
+* multiple sections with the same name.
+*
+* @param cfg
+*   Config file
+* @param sectionname
+*   Section name
+* @param index
+*   Section index
+* @return
+*   Number of entries in section on success, -1 otherwise
+*/
+int rte_cfgfile_section_num_entries_by_index(struct rte_cfgfile *cfg,
+	char *sectionname,
+	int index);
+
 /**
 * Get section entries as key-value pairs
 *