1.17

The C Programming Language/1.17.c

@@ -0,0 +1,60 @@
+#include <stdio.h>
+
+// 80 chars line is too long to test so i shorten to 10
+#define MAXLINE 30
+#define MAXTEXT 3000
+#define SELECTION_LENGTH 10
+
+int _getline(char line[], int maxline);
+int copy(char to[], int head, char from[]);
+
+main()
+{
+	int len;
+	int longest_lines_head;
+	char line[MAXLINE];
+	char longest_lines[MAXTEXT];
+
+	longest_lines_head = 0;
+	while ((len = _getline(line, MAXLINE)) > 0 && longest_lines_head < MAXTEXT)
+		if (len > SELECTION_LENGTH)
+		{
+			longest_lines_head = copy(longest_lines, longest_lines_head, line);
+		}
+	printf("%s\n", longest_lines);
+
+	return 0;
+}
+
+int _getline(char s[], int lim)
+{
+	int c, i, j;
+	for (i = 0; (c = getchar()) != '\n'; ++i)
+	{
+		if (i < lim - 1)
+			s[i] = c;
+	}
+
+	j = i;
+	if (j > lim - 1)
+		j = lim - 1;
+	s[j] = '\0';
+	return i;
+}
+
+int copy(char to[], int head, char from[])
+{
+	int from_i;
+	int to_i;
+
+	from_i = 0;
+	to_i = head;
+	while ((to[to_i] = from[from_i]) != '\0' && to_i < MAXTEXT - 1)
+	{
+		++to_i;
+		++from_i;
+	}
+	to[to_i] = '\n';
+
+	return to_i + 1;
+}