8 files changed, 44 insertions, 7 deletions
diff --git a/src/user/app/init/driver/initctl.c b/src/user/app/init/driver/initctl.c
index b8fbb9b..c31e8fb 100644
--- a/src/user/app/init/driver/initctl.c
+++ b/src/user/app/init/driver/initctl.c
@@ -1,5 +1,6 @@
 #include "driver.h"
 #include <camellia/syscalls.h>
+#include <ctype.h>
 #include <errno.h>
 #include <string.h>
 #include <unistd.h>
diff --git a/src/user/app/login/login.c b/src/user/app/login/login.c
index c1fab3f..241bcfe 100644
--- a/src/user/app/login/login.c
+++ b/src/user/app/login/login.c
@@ -1,5 +1,6 @@
 #include <camellia/flags.h>
 #include <camellia/syscalls.h>
+#include <ctype.h>
 #include <errno.h>
 #include <stdbool.h>
 #include <stdio.h>
diff --git a/src/user/app/shell/parser.c b/src/user/app/shell/parser.c
index 072c720..ad09348 100644
--- a/src/user/app/shell/parser.c
+++ b/src/user/app/shell/parser.c
@@ -1,4 +1,5 @@
 #include "shell.h"
+#include <ctype.h>
 #include <stdbool.h>
 #include <string.h>
 
diff --git a/src/user/lib/ctype.c b/src/user/lib/ctype.c
new file mode 100644
index 0000000..b702703
--- /dev/null
+++ b/src/user/lib/ctype.c
@@ -0,0 +1,31 @@
+#include <ctype.h>
+
+int isalpha(int c) {
+	return islower(c) || isupper(c);
+}
+
+int isalnum(int c) {
+	return isalpha(c) || isdigit(c);
+}
+
+int isdigit(int c) {
+	return '0' <= c && c <= '9';
+}
+
+int islower(int c) {
+	return 'a' <= c && c <= 'z';
+}
+
+int isspace(int c) {
+	return c == ' '
+		|| c == '\f'
+		|| c == '\n'
+		|| c == '\r'
+		|| c == '\t'
+		|| c == '\v';
+}
+
+int isupper(int c) {
+	return 'A' <= c && c <= 'Z';
+}
+
diff --git a/src/user/lib/include/ctype.h b/src/user/lib/include/ctype.h
new file mode 100644
index 0000000..4b15b1d
--- /dev/null
+++ b/src/user/lib/include/ctype.h
@@ -0,0 +1,8 @@
+#pragma once
+
+int isalnum(int c);
+int isalpha(int c);
+int isdigit(int c);
+int islower(int c);
+int isspace(int c);
+int isupper(int c);
diff --git a/src/user/lib/include/string.h b/src/user/lib/include/string.h
index 9e08ae5..eda4e48 100644
--- a/src/user/lib/include/string.h
+++ b/src/user/lib/include/string.h
@@ -1,8 +1,5 @@
 #pragma once
 #include <shared/mem.h>
 
-int isspace(char c);
-
 long strtol(const char *restrict s, char **restrict end, int base);
-
 char *strchr(const char *s, int c);
diff --git a/src/user/lib/include/unistd.h b/src/user/lib/include/unistd.h
index 2b75a13..9b368dc 100644
--- a/src/user/lib/include/unistd.h
+++ b/src/user/lib/include/unistd.h
@@ -1,5 +1,6 @@
 #pragma once
 #include <camellia/types.h> // TODO only needed because of handle_t
+#include <user/lib/vendor/getopt/getopt.h>
 
 int fork(void);
 int close(handle_t h);
diff --git a/src/user/lib/string.c b/src/user/lib/string.c
index a6ac75b..9c347d0 100644
--- a/src/user/lib/string.c
+++ b/src/user/lib/string.c
@@ -1,10 +1,7 @@
+#include <ctype.h>
 #include <errno.h>
 #include <string.h>
 
-int isspace(char c) {
-	return c == ' ' || c == '\t' || c == '\n';
-}
-
 long strtol(const char *restrict s, char **restrict end, int base) {
 	long res = 0;
 	int sign = 1;