From 2f3d854c1226108907651a8fcf9228767eee9742 Mon Sep 17 00:00:00 2001
From: sinanmohd <sinan@firemail.cc>
Date: Sat, 22 Apr 2023 17:46:20 +0530
Subject: 5.20: initial commit

---
 5.20/getch.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 5.20/getch.c

(limited to '5.20/getch.c')

diff --git a/5.20/getch.c b/5.20/getch.c
new file mode 100644
index 0000000..e41671e
--- /dev/null
+++ b/5.20/getch.c
@@ -0,0 +1,22 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include "err.h"
+#include "getch.h"
+
+#define MAXBUFF	100
+
+char buff[MAXBUFF];
+static size_t top;
+
+void ungetch(char c)
+{
+	if (top < MAXBUFF)
+		buff[top++] = c;
+	else
+		err("buff: stack overflow");
+}
+
+char getch(void)
+{
+	return (top > 0) ? buff[--top] : getchar();
+}
-- 
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