[PATCH v9 4/9] perf config: Add comparing name treating '_' and '-' as being the same thing.

[Taeung Song]

The comparing name functionality is that
two config name are compared treating '-' or '_' as
being the same thing. For example, both 'print_percent'
and 'print-percent' in 'call-graph' section
are regarded as the same thing.

Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/builtin-config.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index f99c39d..d4e2899 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -32,6 +32,27 @@ static struct option config_options[] = {
        OPT_END()
 };
 
+static int compare_name(const char *name1, const char *name2)
+{
+       while (true) {
+               /*
+                * If two names have '-' or '_', them are treated
+                * as being the same thing.
+                */
+               if ((*name1 == '-' || *name1 == '_')
+                   && (*name2 == '-' || *name2 == '_')) {
+                       name1++, name2++;
+                       continue;
+               }
+
+               if (*name1 && (*name1 == *name2))
+                       name1++, name2++;
+               else
+                       break;
+       }
+       return *(const unsigned char *)name1-*(const unsigned char *)name2;
+}
+
 static struct config_section *find_section(struct list_head *sections,
                                           const char *section_name)
 {
@@ -50,7 +71,7 @@ static struct config_element *find_element(const char *name,
        struct config_element *element;
 
        list_for_each_entry(element, &section->element_head, list)
-               if (!strcmp(element->name, name))
+               if (!compare_name(element->name, name))
                        return element;
 
        return NULL;
-- 
1.9.1

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