first commit

strutils.c

@@ -0,0 +1,31 @@
+#include "strutils.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+void strToLower(char *str) {
+    for(char *beg = str; *beg; ++beg) {
+        *beg = tolower(*beg);
+    }
+}
+
+void strnToLower(char *str, size_t len) {
+    for(size_t i = 0; i < len; ++i) {
+        str[i] = tolower(str[i]);
+    }
+}
+
+char *cstrdup(const char *str) {
+    size_t len = strlen(str);
+    char *buf = malloc(len + 1);
+    memcpy(buf, str, len);
+    buf[len] = '\0';
+    return buf;
+}
+
+char *cstrToLower(const char *str) {
+    char *buf = cstrdup(str);
+    strToLower(buf);
+    return buf;
+}