4 files changed, 86 insertions, 0 deletions
diff --git a/7.2/Makefile b/7.2/Makefile
new file mode 100644
index 0000000..982c7a2
--- /dev/null
+++ b/7.2/Makefile
@@ -0,0 +1,11 @@
+objects = main.o getch.o
+CC = gcc
+CFLAGS = -Wvla -Wall -Wextra -Wstrict-prototypes -Wmissing-prototypes -fsanitize=address
+
+fmt : $(objects)
+	$(CC) $(CFLAGS) -o fmt $(objects)
+main.o: getch.h
+
+.PHONY : clean
+clean:
+	rm fmt $(objects)
diff --git a/7.2/getch.c b/7.2/getch.c
new file mode 100644
index 0000000..a473190
--- /dev/null
+++ b/7.2/getch.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <error.h>
+#include <errno.h>
+#include "getch.h"
+
+#define MAXBUFF 100
+
+int gtop;
+char buff[MAXBUFF];
+
+char getch(void)
+{
+	return (gtop > 0) ? buff[--gtop] : getchar();
+}
+
+void ungetch(char c)
+{
+	if (gtop < MAXBUFF)
+		buff[gtop++] = c;
+	else
+	 	error(EXIT_FAILURE, ENOBUFS, "getch");
+}
diff --git a/7.2/getch.h b/7.2/getch.h
new file mode 100644
index 0000000..b0e086b
--- /dev/null
+++ b/7.2/getch.h
@@ -0,0 +1,2 @@
+char getch(void);
+void ungetch(char c);
diff --git a/7.2/main.c b/7.2/main.c
new file mode 100644
index 0000000..f11256e
--- /dev/null
+++ b/7.2/main.c
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <ctype.h>
+#include "getch.h"
+
+#define MAXLINE	80
+#define OCTLEN	6
+
+int inc(int col, int n);
+
+int main(void)
+{
+	char c, col, next;
+
+	col = 0;
+	while ((c = getch()) != EOF) {
+		if (iscntrl(c) || isblank(c)) {
+			col = inc(col, OCTLEN);
+			printf(" \\%03o ", c);
+
+			if (c == '\n') {
+				col = 0;
+				putchar(c);
+			}
+		} else {
+			col = inc(col, 1);
+			/* ac-
+			 * k */ 
+			ungetch(next = getch());
+			if (col == MAXLINE && isalpha(c) &&
+			    isalpha(next)) {
+				ungetch(c);
+				c = '-';
+			}
+
+			putchar(c);
+		}
+	}
+
+	return 0;
+}
+
+int inc(int col, int n)
+{
+	if (col + n > MAXLINE) {
+		putchar('\n');
+		return n;
+	} else {
+		return col + n;
+	}
+}