open uses new command format now

buffer.c

@@ -24,4 +24,10 @@ b_truncate(Row *row) {
         }
 }
 
+int
+b_countlines(Row *row) {
+	int lines = 1;
+	for(; row->n != NULL; row = row->n) lines++;
+	return lines;
+}
 

c_file.c

@@ -1,6 +1,7 @@
 void
 c_open(char *file, char **argv) {
-	FILE *f = fopen(file + 2, "r");
+	if(argv[1] == NULL) { puts("usage: O filename"); return;}
+	FILE *f = fopen(argv[1], "r");
 	if(f == NULL) { puts("couldnt open file."); return; }
 	b_truncate(buffer);
 	Row *row = buffer;
@@ -38,3 +39,4 @@ c_save(char *file, char **argv) {
 
 
 
+

c_print.c

@@ -7,6 +7,7 @@ else printf("%c", row->text[i]);
 }
 }
 
+/*
 void
 c_print(char *c, char **argv) {
        Row *row = buffer;
@@ -22,6 +23,24 @@ c_print(char *c, char **argv) {
                 row = row -> n;
         }
 }
+*/
+
+
+void
+c_print(char *c, char **argv) {
+	int start = argv[1] != NULL ? atoi(argv[1]) : 1;
+	int end = argv[2] != NULL ? atoi(argv[2]) : b_countlines(buffer);
+	start = start > 1 ? start : 1;
+	end = end < b_countlines(buffer) ? end : b_countlines(buffer);
+	Row *row = b_getline(buffer, start);
+	for(int line = start; line <= end; line++) {
+		printf("%3.i| ", line);
+		print_with_fixed_tabs(row);
+		puts("");
+		row = row->n;
+	}
+}
+