kernel: Add string view and string builder

This makes write/read calls that use strings to communicate much
simpler and less error prone.

1 files changed, 5 insertions, 0 deletions

diff --git a/kernel/libc/ctype/isspace.c b/kernel/libc/ctype/isspace.c
new file mode 100644
index 0000000..a922d91
--- /dev/null
+++ b/kernel/libc/ctype/isspace.c
@@ -0,0 +1,5 @@
+#include <ctype.h>
+
+int isspace(int c) {
+  return c == ' ' || (unsigned)c - '\t' < 5;
+}