1 files changed, 27 insertions, 2 deletions
diff --git a/src/user/lib/ctype.c b/src/user/lib/ctype.c
index 7d3a707..fa49a07 100644
--- a/src/user/lib/ctype.c
+++ b/src/user/lib/ctype.c
@@ -1,21 +1,40 @@
 #include <ctype.h>
 
+int isalnum(int c) {
+	return isalpha(c) || isdigit(c);
+}
+
 int isalpha(int c) {
 	return islower(c) || isupper(c);
 }
 
-int isalnum(int c) {
-	return isalpha(c) || isdigit(c);
+int iscntrl(int c) {
+	return c <= 0x1f || c == 0x7f;
 }
 
 int isdigit(int c) {
 	return '0' <= c && c <= '9';
 }
 
+int isgraph(int c) {
+	return isalpha(c) || isdigit(c) || ispunct(c);
+}
+
 int islower(int c) {
 	return 'a' <= c && c <= 'z';
 }
 
+int isprint(int c) {
+	return isgraph(c) || c == ' ';
+}
+
+int ispunct(int c) {
+	return ('!' <= c && c <= '/')
+		|| (':' <= c && c <= '@')
+		|| ('[' <= c && c <= '`')
+		|| ('{' <= c && c <= '~');
+}
+
 int isspace(int c) {
 	return c == ' '
 		|| c == '\f'
@@ -29,6 +48,12 @@ int isupper(int c) {
 	return 'A' <= c && c <= 'Z';
 }
 
+int isxdigit(int c) {
+	return ('0' <= c && c <= '9')
+		|| ('A' <= c && c <= 'F')
+		|| ('a' <= c && c <= 'f');
+}
+
 int tolower(int c) {
 	if (isupper(c)) return c - 'A' + 'a';
 	return c;