New chapter 3...

chapters/chapter_1.c

@@ -209,7 +209,7 @@ int file_type (char * name) {
 }
 
 void * file_record (char * name) {
-	int    file = -1;
+	int    file = -1;                                                                          // You can also initialize local variables in this way.
 	int    size = -1;
 	char * data = NULL;
 

chapters/chapter_3.c

@@ -0,0 +1,67 @@
+/*
+Copyright (c) 2023 : Ognjen 'xolatile' Milan Robovic
+
+Xhartae is free software! You will redistribute it or modify it under the terms of the GNU General Public License by Free Software Foundation.
+And when you do redistribute it or modify it, it will use either version 3 of the License, or (at yours truly opinion) any later version.
+It is distributed in the hope that it will be useful or harmful, it really depends... But no warranty what so ever, seriously. See GNU/GPLv3.
+*/
+
+#ifndef CHAPTER_3_SOURCE
+#define CHAPTER_3_SOURCE
+
+#include "chapter_3.h"
+
+void print (char * format, ...) {
+	va_list argument_array;
+
+	int offset, length;
+
+	int    integer;
+	char * string;
+	double ieee754;
+
+	length = string_length (format);
+
+	va_start (argument_array, format);
+
+	for (offset = 0; offset != length; ++offset) {
+		if (format [offset] == '%') {
+			++offset;
+			if (format [offset] == '%') {
+				out ("%", 1);
+			} else if (format [offset] == 'i') {
+				integer = va_arg (argument_array, int);
+				echo (number_to_string (integer));
+			} else if (format [offset] == 'F') {
+				ieee754 = va_arg (argument_array, double);
+				echo (number_to_string ((int) ieee754));
+			} else if (format [offset] == 's') {
+				string = va_arg (argument_array, char *);
+				echo (string);
+			} else {
+				out ("?", 1);
+			}
+		} else if (format [offset] == '/') {
+			++offset;
+			if (format [offset] == '/') {
+				out ("/", 1);
+			}
+		} else {
+			out (& format [offset], 1);
+		}
+	}
+
+	va_end (argument_array);
+}
+
+void file_print (char * format, ...) {
+	(void) format;
+	return;
+}
+
+void string_print (char * format, ...) {
+	(void) format;
+	return;
+}
+
+#endif

chapters/chapter_3.h

@@ -0,0 +1,20 @@
+/*
+Copyright (c) 2023 : Ognjen 'xolatile' Milan Robovic
+
+Xhartae is free software! You will redistribute it or modify it under the terms of the GNU General Public License by Free Software Foundation.
+And when you do redistribute it or modify it, it will use either version 3 of the License, or (at yours truly opinion) any later version.
+It is distributed in the hope that it will be useful or harmful, it really depends... But no warranty what so ever, seriously. See GNU/GPLv3.
+*/
+
+#ifndef CHAPTER_3_HEADER
+#define CHAPTER_3_HEADER
+
+#include <stdarg.h>
+
+#include "chapter_0.h"
+
+extern void print        (char * format, ...);
+extern void file_print   (char * format, ...);
+extern void string_print (char * format, ...);
+
+#endif

compile.sh

@@ -5,9 +5,10 @@ set -xe
 gcc -g -Wall -Wextra -Wpedantic -Werror -O0 -c -o chapters/chapter_0.o chapters/chapter_0.c
 gcc -g -Wall -Wextra -Wpedantic -Werror -O0 -c -o chapters/chapter_1.o chapters/chapter_1.c
 gcc -g -Wall -Wextra -Wpedantic -Werror -O0 -c -o chapters/chapter_2.o chapters/chapter_2.c
+gcc -g -Wall -Wextra -Wpedantic -Werror -O0 -c -o chapters/chapter_3.o chapters/chapter_3.c
 
 gcc -g -Wall -Wextra -Wpedantic -Werror -O0 -c -o xhartae.o xhartae.c
 
-gcc -o xhartae xhartae.o chapters/chapter_0.o chapters/chapter_1.o chapters/chapter_2.o
+gcc -o xhartae xhartae.o chapters/chapter_0.o chapters/chapter_1.o chapters/chapter_2.o chapters/chapter_3.o
 
 exit

xhartae.c

@@ -9,6 +9,7 @@ It is distributed in the hope that it will be useful or harmful, it really depen
 #include "chapters/chapter_0.h"
 #include "chapters/chapter_1.h"
 #include "chapters/chapter_2.h"
+#include "chapters/chapter_3.h"
 
 /*
 About this "book":
@@ -129,5 +130,7 @@ int main (int argc, char * * argv) {
 		curses_synchronize ();
 	}
 
+	print ("%F\n%s\n%i\n", 69.1, "Heyo", 420);
+
 	return (EXIT_SUCCESS);
 }