Solve Exercise 8-2: fopen and fillbuf

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diff --git a/ch8/8-02_stdlib-fopen-and-fillbuf.c b/ch8/8-02_stdlib-fopen-and-fillbuf.c
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+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* The C Programming Language: 2nd Edition
+ *
+ * Exercise 8-2: Rewrite `fopen` and `_fillbuf` with fields instead of explicit
+ * bit operations. Compare code size and execution speed.
+ *
+ * Notes: This file uses the standard library exclusively, in contrast to the
+ * partial replacement solution in the other 8-02 files.
+ *
+ * The resulting binary of this file executes in about 0.001s, just like the
+ * partial replacement solution. Its binary is 1KB smaller, however.
+ */
+int main() {
+	FILE *fp = fopen("8-02_fopen-and-fillbuf.c", "r");
+	if (fp != NULL) {
+		puts("We could read the file.\n");
+		/* pro tip: don't declare this as 'unsigned' or you'll create an
+		 * endless loop thanks to EOF typically being negative. Don't waste
+		 * half an hour on a newbie mistake like I did. :)
+		 */
+		char c;
+		while ((c = getc(fp)) != EOF) {
+			putchar(c);
+		}
+	} else {
+		puts("Could not open file for reading.");
+	}
+	return 0;
+}