1 files changed, 29 insertions, 0 deletions
diff --git a/src/strutils.cc b/src/strutils.cc
new file mode 100644
index 0000000..e7b7c93
--- /dev/null
+++ b/src/strutils.cc
@@ -0,0 +1,29 @@
+#include "common.hh"
+
+#include "strutils.hh"
+
+namespace stuff {
+
+std::string ascii_tolower(const std::string& str) {
+    for (auto it = str.begin(); it != str.end(); ++it) {
+        if (*it >= 'A' && *it <= 'Z') {
+            std::string ret(str.begin(), it);
+            ret.push_back('a' + *it - 'A');
+            auto last = ++it;
+            while (it != str.end()) {
+                if (*it >= 'A' && *it <= 'Z') {
+                    ret.append(last, it);
+                    ret.push_back('a' + *it - 'A');
+                    last = ++it;
+                } else {
+                    ++it;
+                }
+            }
+            ret.append(last, it);
+            return ret;
+        }
+    }
+    return str;
+}
+
+}  // namespace stuff