From 973e27b243ea7f12b6743894465c67a4a6a87eb2 Mon Sep 17 00:00:00 2001
From: Carlos Maiolino <cem@toxiclabs.cc>
Date: Sat, 6 Sep 2025 09:26:21 +0200
Subject: Move some other code here

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>
---
 C/HF/chap4/cryptic/Makefile  | 14 ++++++++++++++
 C/HF/chap4/cryptic/ecat.c    | 23 +++++++++++++++++++++++
 C/HF/chap4/cryptic/encrypt.c |  9 +++++++++
 C/HF/chap4/cryptic/encrypt.h |  6 ++++++
 C/HF/chap4/cryptic/message.c | 13 +++++++++++++
 5 files changed, 65 insertions(+)
 create mode 100644 C/HF/chap4/cryptic/Makefile
 create mode 100644 C/HF/chap4/cryptic/ecat.c
 create mode 100644 C/HF/chap4/cryptic/encrypt.c
 create mode 100644 C/HF/chap4/cryptic/encrypt.h
 create mode 100644 C/HF/chap4/cryptic/message.c

(limited to 'C/HF/chap4/cryptic')

diff --git a/C/HF/chap4/cryptic/Makefile b/C/HF/chap4/cryptic/Makefile
new file mode 100644
index 0000000..64312d5
--- /dev/null
+++ b/C/HF/chap4/cryptic/Makefile
@@ -0,0 +1,14 @@
+ecat: ecat.o encrypt.o
+	cc -o ecat ecat.o encrypt.o
+
+ecat.o: encrypt.h ecat.c
+	cc -c ecat.c
+
+message: message.o encrypt.o
+	cc -o message message.o encrypt.o
+
+message.o: encrypt.h message.c
+	cc -c message.c
+
+encrypt.o: encrypt.h encrypt.c
+	cc -c encrypt.c
diff --git a/C/HF/chap4/cryptic/ecat.c b/C/HF/chap4/cryptic/ecat.c
new file mode 100644
index 0000000..5266116
--- /dev/null
+++ b/C/HF/chap4/cryptic/ecat.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include "encrypt.h"
+
+int main(int argc, char **argv)
+{
+	FILE *fd;
+	char buf[80];
+
+	if (argc != 2)
+		return 1;
+
+	fd = fopen(argv[1], "r");
+
+	while (fgets(buf, 80, fd)) {
+		encrypt(buf);
+		printf("%s", buf);
+	}
+
+	printf("\n");
+	fclose(fd);
+
+	return 0;
+}
diff --git a/C/HF/chap4/cryptic/encrypt.c b/C/HF/chap4/cryptic/encrypt.c
new file mode 100644
index 0000000..128b1a4
--- /dev/null
+++ b/C/HF/chap4/cryptic/encrypt.c
@@ -0,0 +1,9 @@
+#include "encrypt.h"
+
+void encrypt(char *message)
+{
+	while (*message) {
+		*message = *message ^ 42;
+		message++;
+	}
+}
diff --git a/C/HF/chap4/cryptic/encrypt.h b/C/HF/chap4/cryptic/encrypt.h
new file mode 100644
index 0000000..7d5cf9d
--- /dev/null
+++ b/C/HF/chap4/cryptic/encrypt.h
@@ -0,0 +1,6 @@
+#ifndef ENCRYPT_H
+#define ENCRYPT_H
+
+void encrypt(char *m);
+
+#endif
diff --git a/C/HF/chap4/cryptic/message.c b/C/HF/chap4/cryptic/message.c
new file mode 100644
index 0000000..345774c
--- /dev/null
+++ b/C/HF/chap4/cryptic/message.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include "encrypt.h"
+
+int main(void)
+{
+	char msg[80];
+	while (fgets(msg, 80, stdin)) {
+		encrypt(msg);
+		printf("%s\n", msg);
+	}
+
+	return 0;
+}
-- 
cgit v1.2.3