lib: style: Pass const references of std::string

(Sorry, resend. Forget to fill the subject line properly).

lib: Pass const references of std::string, avoiding temporary object
creation.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

2 files changed, 6 insertions, 7 deletions

diff --git a/lib.cpp b/lib.cpp
index 103c8ff..3c411c9 100644
--- a/lib.cpp
+++ b/lib.cpp
@@ -50,7 +50,6 @@ extern "C" {
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <dirent.h>
-#include <string.h>
 #include <locale.h>
 #include <libintl.h>
 #include <limits>
@@ -163,7 +162,7 @@ bool stringless::operator()(const char * const & lhs, const char * const & rhs)
 	return false;
 }  
 
-void write_sysfs(string filename, string value)
+void write_sysfs(const string &filename, const string &value)
 {
 	ofstream file;
 
@@ -174,7 +173,7 @@ void write_sysfs(string filename, string value)
 	file.close();
 }
 
-int read_sysfs(string filename)
+int read_sysfs(const string &filename)
 {
 	ifstream file;
 	int i;
@@ -187,7 +186,7 @@ int read_sysfs(string filename)
 	return i;
 }
 
-string read_sysfs_string(string filename)
+string read_sysfs_string(const string &filename)
 {
 	ifstream file;
 	char content[4096];
diff --git a/lib.h b/lib.h
index f4e6889..2a7db5c 100644
--- a/lib.h
+++ b/lib.h
@@ -56,9 +56,9 @@ public:
 #include <string>
 using namespace std;
 
-extern void write_sysfs(string filename, string value);
-extern int read_sysfs(string filename);
-extern string read_sysfs_string(string filename);
+extern void write_sysfs(const string &filename, const string &value);
+extern int read_sysfs(const string &filename);
+extern string read_sysfs_string(const string &filename);
 extern string read_sysfs_string(const char *format, const char *param);
 
 extern void format_watts(double W, char *buffer, unsigned int len);