src: add str_toupper and str_tolower functions

Add auxiliar string case change functions.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/utils.c b/src/utils.c
index ced6470..d49a9ac 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -10,7 +10,7 @@
 #include <ctype.h>
 #include "utils.h"
 
-const char *str_toupper(char *str)
+void str_toupper(char *str)
 {
        char *c = str;
 
@@ -18,6 +18,14 @@ const char *str_toupper(char *str)
                *c = toupper(*c);
                c++;
        }
+}
+
+void str_tolower(char *str)
+{
+       char *c = str;
 
-       return str;
+       while (*c) {
+               *c = tolower(*c);
+               c++;
+       }
 }