1 files changed, 65 insertions, 0 deletions
diff --git a/src/libc/ctype.c b/src/libc/ctype.c
new file mode 100644
index 0000000..fa49a07
--- /dev/null
+++ b/src/libc/ctype.c
@@ -0,0 +1,65 @@
+#include <ctype.h>
+
+int isalnum(int c) {
+	return isalpha(c) || isdigit(c);
+}
+
+int isalpha(int c) {
+	return islower(c) || isupper(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'
+		|| c == '\n'
+		|| c == '\r'
+		|| c == '\t'
+		|| c == '\v';
+}
+
+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;
+}
+
+int toupper(int c) {
+	if (islower(c)) return c - 'a' + 'A';
+	return c;
+}