[PATCH 4/4] cfgfile: add unique name flag

[Chengwen Feng]

The cfgfile supports duplicate section name and entry name when parsing
config file, which may confused and hard to debug when accidentally set
duplicate name.

So add unique name flag, it will treat as error if encounter duplicate
section name or entry name.

Cc: stable at dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen at huawei.com>
---
 lib/cfgfile/rte_cfgfile.c | 32 +++++++++++++++++++++++---------
 lib/cfgfile/rte_cfgfile.h |  7 +++++++
 2 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/lib/cfgfile/rte_cfgfile.c b/lib/cfgfile/rte_cfgfile.c
index ad9314dc14..9e901b0977 100644
--- a/lib/cfgfile/rte_cfgfile.c
+++ b/lib/cfgfile/rte_cfgfile.c
@@ -102,8 +102,8 @@ _get_section(struct rte_cfgfile *cfg, const char *sectionname)
 }
 
 static int
-_add_entry(struct rte_cfgfile_section *section, const char *entryname,
-		const char *entryvalue)
+_add_entry(struct rte_cfgfile *cfg, struct rte_cfgfile_section *section,
+	   const char *entryname, const char *entryvalue, bool check_dup)
 {
 	int name_len, value_len;
 
@@ -115,6 +115,14 @@ _add_entry(struct rte_cfgfile_section *section, const char *entryname,
 		return -EINVAL;
 	}
 
+	if (check_dup) {
+		if (rte_cfgfile_has_entry(cfg, section->name, entryname) != 0) {
+			CFG_LOG(ERR, "duplicate entry name %s in section %s",
+				entryname, section->name);
+			return -EEXIST;
+		}
+	}
+
 	/* resize entry structure if we don't have room for more entries */
 	if (section->num_entries == section->allocated_entries) {
 		struct rte_cfgfile_entry *n_entries = realloc(
@@ -264,8 +272,9 @@ rte_cfgfile_load_with_params(const char *filename, int flags,
 			if (cfg->num_sections == 0)
 				goto error1;
 
-			ret = _add_entry(&cfg->sections[cfg->num_sections - 1],
-					 split[0], split[1]);
+			ret = _add_entry(cfg, &cfg->sections[cfg->num_sections - 1],
+					 split[0], split[1],
+					 !!(flags & CFG_FLAG_UNIQUE_NAME));
 			if (ret != 0)
 				goto error1;
 		}
@@ -286,7 +295,8 @@ rte_cfgfile_create(int flags)
 	struct rte_cfgfile *cfg;
 
 	/* future proof flags usage */
-	if (flags & ~(CFG_FLAG_GLOBAL_SECTION | CFG_FLAG_EMPTY_VALUES))
+	if (flags & ~(CFG_FLAG_GLOBAL_SECTION | CFG_FLAG_EMPTY_VALUES |
+		      CFG_FLAG_UNIQUE_NAME))
 		return NULL;
 
 	cfg = malloc(sizeof(*cfg));
@@ -356,6 +366,13 @@ rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
 		return -EINVAL;
 	}
 
+	if (cfg->flags & CFG_FLAG_UNIQUE_NAME) {
+		if (rte_cfgfile_has_section(cfg, sectionname) != 0) {
+			CFG_LOG(ERR, "duplicate section name %s", sectionname);
+			return -EEXIST;
+		}
+	}
+
 	/* resize overall struct if we don't have room for more	sections */
 	if (cfg->num_sections == cfg->allocated_sections) {
 
@@ -396,16 +413,13 @@ int rte_cfgfile_add_entry(struct rte_cfgfile *cfg,
 			|| (entryvalue == NULL))
 		return -EINVAL;
 
-	if (rte_cfgfile_has_entry(cfg, sectionname, entryname) != 0)
-		return -EEXIST;
-
 	/* search for section pointer by sectionname */
 	struct rte_cfgfile_section *curr_section = _get_section(cfg,
 								sectionname);
 	if (curr_section == NULL)
 		return -EINVAL;
 
-	ret = _add_entry(curr_section, entryname, entryvalue);
+	ret = _add_entry(cfg, curr_section, entryname, entryvalue, true);
 
 	return ret;
 }
diff --git a/lib/cfgfile/rte_cfgfile.h b/lib/cfgfile/rte_cfgfile.h
index 232c65c77b..74057c1b73 100644
--- a/lib/cfgfile/rte_cfgfile.h
+++ b/lib/cfgfile/rte_cfgfile.h
@@ -56,6 +56,13 @@ enum {
 	 * be zero length (e.g., "key=").
 	 */
 	CFG_FLAG_EMPTY_VALUES = 2,
+
+	/**
+	 * Indicates that file should have unique section name AND unique
+	 * entry's name. If a duplicate name is detected, the operation will
+	 * return error.
+	 */
+	CFG_FLAG_UNIQUE_NAME = 4,
 };
 /**@} */
 
-- 
2.17.1