can now writelines

b_getline.c

@@ -0,0 +1,8 @@
+Row *
+b_getline(Row *r, int l) {
+
+	if (l == 1) return r;
+	if (r->n == NULL) return NULL;
+	return b_getline(r->n, l - 1);
+}
+

c_writeline.c

@@ -0,0 +1,19 @@
+void
+c_writeline(char *c) {
+        c += 2;
+        int line = atoi(c);
+        for(; *c != 0 && *c != ' '; c++);
+        c += 1; // start of text
+        Row *r = b_getline(buffer, line);
+        if (r == NULL) {
+                printf("%i, invalid line.\n", line);
+                return;
+        }
+	int i = 0;
+	for (;i < ROW_SIZE && c[i] != 0; i++) {
+                r->text[i] = c[i];
+        }
+	for(;i < ROW_SIZE; i++) {
+		r->text[i] = 0;
+	}
+}

commands.c

@@ -3,3 +3,4 @@ NULL,
 ['q'] = c_quit,
 ['O'] = c_open,
 ['P'] = c_print,
+['w'] = c_writeline,

efn.c

@@ -17,3 +17,6 @@
 #include "b_truncate.c"
 #include "c_print.c"
 #include "b_insert.c"
+#include "c_writeline.c"
+#include "b_getline.c"
+

efn.h

@@ -10,3 +10,5 @@ void c_open(char *);
 void b_truncate(Row *);
 void c_print(char *);
 Row *b_insert(Row *);
+Row *b_getline(Row *, int);
+void c_writeline(char *);