static struct 
{
 int baselen;
 ....
} store;
int git_config_rename_section_in_file(const char *new_name,....)
{
 while (....)
 {
 char *output = buf;
 ....
 store.baselen = strlen(new_name);
 ....
 if (strlen(output) > 0)
 ....
 }
}