From 23198d16f445e3596e6d309a5d36b144fb32e058 Mon Sep 17 00:00:00 2001
From: pommicket <pommicket@gmail.com>
Date: Tue, 15 Feb 2022 16:36:52 -0500
Subject: ctype.h, getenv

---
 05/ctype.h | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 05/ctype.h

(limited to '05/ctype.h')

diff --git a/05/ctype.h b/05/ctype.h
new file mode 100644
index 0000000..ed6833d
--- /dev/null
+++ b/05/ctype.h
@@ -0,0 +1,92 @@
+#ifndef _CTYPE_H
+#define _CTYPE_H
+
+#include <stdc_common.h>
+
+int islower(int c) {
+	return c >= 'a' && c <= 'z';
+}
+
+int isupper(int c) {
+	return c >= 'A' && c <= 'Z';
+}
+
+int isalpha(int c) {
+	return isupper(c) || islower(c);
+}
+
+int isalnum(int c) {
+	return isalpha(c) || isdigit(c);
+}
+
+int isprint(int c) {
+	if (isalnum(c)) return 1;
+	switch (c) {
+	case '!': return 1;
+	case '@': return 1;
+	case '#': return 1;
+	case '$': return 1;
+	case '%': return 1;
+	case '^': return 1;
+	case '&': return 1;
+	case '*': return 1;
+	case '(': return 1;
+	case ')': return 1;
+	case '-': return 1;
+	case '=': return 1;
+	case '_': return 1;
+	case '+': return 1;
+	case '`': return 1;
+	case '~': return 1;
+	case '[': return 1;
+	case '{': return 1;
+	case ']': return 1;
+	case '}': return 1;
+	case '\\': return 1;
+	case '|': return 1;
+	case ';': return 1;
+	case ':': return 1;
+	case '\'': return 1;
+	case '"': return 1;
+	case ',': return 1;
+	case '<': return 1;
+	case '.': return 1;
+	case '>': return 1;
+	case '/': return 1;
+	case '?': return 1;
+	}
+	return 0;
+}
+
+int iscntrl(int c) {
+	return !isprint(c);
+}
+
+int isgraph(int c) {
+	return isprint(c) && c != ' ';
+}
+
+int ispunct(int c) {
+	return isprint(c) && c != ' ' && !isalnum(c);
+}
+
+int isxdigit(int c) {
+	if (isdigit(c)) return 1;
+	if (c >= 'a' && c <= 'f') return 1;
+	if (c >= 'A' && c <= 'F') return 1;
+	return 0;
+}
+
+int tolower(int c) {
+	if (c >= 'A' && c <= 'Z')
+		return c - 'A' + 'a';
+	return c;
+}
+
+int toupper(int c) {
+	if (c >= 'a' && c <= 'z')
+		return c - 'a' + 'A';
+	return c;
+}
+
+#endif // _CTYPE_H
-- 
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