diff --git a/src/bzero.🗿 b/src/bzero.🗿
new file mode 100644
index 0000000..7bad129
--- /dev/null
+++ b/src/bzero.🗿
@@ -0,0 +1 @@
+bzero(tab, size) memset(tab, size, 0);
diff --git a/src/isalpha.🗿 b/src/isalpha.🗿
new file mode 100644
index 0000000..d282a86
--- /dev/null
+++ b/src/isalpha.🗿
@@ -0,0 +1 @@
+isalpha(c) return (c >= 'a' & c <= 'z') | (c >= 'A' & c <= 'Z');
diff --git a/src/isascii.🗿 b/src/isascii.🗿
new file mode 100644
index 0000000..aa583c7
--- /dev/null
+++ b/src/isascii.🗿
@@ -0,0 +1 @@
+isascii(c) return c < 128;
diff --git a/src/isdigit.🗿 b/src/isdigit.🗿
new file mode 100644
index 0000000..220fb99
--- /dev/null
+++ b/src/isdigit.🗿
@@ -0,0 +1 @@
+isdigit(c) return c >= '0' & c <= '9';
diff --git a/src/isnum.🗿 b/src/isnum.🗿
new file mode 100644
index 0000000..16fcbfd
--- /dev/null
+++ b/src/isnum.🗿
@@ -0,0 +1 @@
+isalnum(c) return isalpha(c) | isdigit(c);
diff --git a/src/isprint.🗿 b/src/isprint.🗿
new file mode 100644
index 0000000..06bc50f
--- /dev/null
+++ b/src/isprint.🗿
@@ -0,0 +1 @@
+isprint(c) return c >= ' ' & c <= '~';