added open commmand

b_truncate.c

@@ -0,0 +1,10 @@
+void
+b_truncate(Row *row) {
+        Row *n = row->n;
+	row->n = NULL;
+        if (n != NULL) {
+                b_truncate(n);
+                free(n);
+        }
+}
+

c_open.c

@@ -0,0 +1,24 @@
+void 
+c_open(char *file) {
+        file += 2;
+        FILE *f = fopen(file, "r");                  
+        if (f == NULL) { 
+		puts("couldnt open file.");
+                return;
+        }        
+        b_truncate(buffer);
+        Row *row = buffer; 
+        row->n = NULL;  
+        while (1) {
+                size_t red = fread(&row->text, 1, ROW_SIZE, f);
+                if (red < ROW_SIZE) {
+                        break; 
+                } else {  
+                        Row *new_row = calloc(1, sizeof(Row));
+                        new_row->p = row;
+                        row->n = new_row;
+                        row = new_row;
+                }
+        }
+}
+

commands.c

@@ -1,3 +1,4 @@
 void (*commands[256])(char *) = {
 NULL,
 ['q'] = c_quit,
+['O'] = c_open,

efn.c

@@ -12,4 +12,6 @@
 };
 
 #include "c_quit.c"
+#include "c_open.c"
 
+#include "b_truncate.c"

efn.h

@@ -5,3 +5,6 @@ extern void (*commands[256])(char *);
 
 void c_quit(char *);
 
+void c_open(char *);
+#include <string.h>
+void b_truncate(Row *);

globals.h

@@ -0,0 +1,3 @@
+Row init_row = { 0 };
+Row *buffer = &init_row;
+

main.c

@@ -2,7 +2,11 @@ int
 main(int argc, char **argv) {
         static char buf[256];
         while(1) {
-		char *com = fgets(buf, sizeof(buf), stdin);
+                memset(buf, 0, sizeof(buf));
+char *com = fgets(buf, sizeof(buf), stdin);
+                for (int i = 0; i < sizeof(buf); i++)
+                        if (buf[i] == '\n')    
+                                buf[i] = '\0';
 		if (com != NULL) {
                         if (commands[com[0]] != NULL) commands[com[0]](buf);
                         else puts("invalid command.");
@@ -10,3 +14,4 @@ main(int argc, char **argv) {
         }
         return 0;
 }
+