fdsdump: add string_to_lower to common funcs

Author: sedmicha

src/tools/fdsdump/src/common/common.cpp

@@ -99,6 +99,13 @@ string_trim_copy(std::string str)
     return str;
 }
 
+std::string
+string_to_lower(std::string str)
+{
+    std::for_each(str.begin(), str.end(), [](char &c) { c = std::tolower(c); });
+    return str;
+}
+
 void
 memcpy_bits(uint8_t *dst, uint8_t *src, unsigned int n_bits)
 {

src/tools/fdsdump/src/common/common.hpp

@@ -61,6 +61,17 @@ string_trim(std::string &str);
 std::string
 string_trim_copy(std::string str);
 
+
+/**
+ * @brief Convert a string to lowercase
+ *
+ * @param The string to convert
+ *
+ * @return The supplied string converted to lowercase
+ */
+std::string
+string_to_lower(std::string str);
+
 /**
  * @brief Copy a specified number of bits from source to destination,
  *   remaining bits in an incomplete byte are zeroed.