1 files changed, 26 insertions, 0 deletions
diff --git a/klib/toupper.c b/klib/toupper.c
new file mode 100644
index 0000000..807eb38
--- /dev/null
+++ b/klib/toupper.c
@@ -0,0 +1,26 @@
+#include "string.h"
+
+int
+toupper(int c)
+{
+    if(c >= 'a' && c <= 'z')
+        c -= ('a' - 'A');
+    return c;
+}
+
+char*
+stoupper(char *s)
+{
+    char *o = s;
+    for(; *s != 0; s++)
+        *s = toupper(*s);
+    return o;
+}
+
+char*
+sntoupper(char *s, size_t limit)
+{
+    for(size_t i = 0; i < limit; i++)
+        s[i] = toupper(s[i]);
+    return s;
+}