funny valgrind

src/interpreter.c

@@ -136,7 +136,6 @@ next:
             break;
         case LeaveTape:
         case Eof:
-        case Invalid:
             return;
     }
 

src/program.c

@@ -64,7 +64,8 @@ retest:
         case EOF:
             return Eof;
         default:
-            return Invalid;
+            c = next_char();
+            goto retest;
     }
 }
 
@@ -80,16 +81,12 @@ void program_init(char* file_path, Program* program) {
 
     program->data = malloc(capacity * sizeof(Symbol));
     program->len = 0;
+    program->index = 0;
 
     Symbol s;
     while(true) {
         s = next_symbol();
         
-        if (s == Invalid) {
-            printf("error: invalid symbol at character %d\n", count);
-            exit(EXIT_FAILURE);
-        }
-
         if (program->len == capacity) {
             capacity *= 2;
             program->data = realloc(program->data, capacity * sizeof(Symbol));
@@ -118,7 +115,7 @@ void program_next(Program* program, Symbol* symbol) {
 }
 
 void program_last(Program* program, Symbol* symbol) {
-    if (program->index == 0) {
+    if (program->index < 1) {
         *symbol = Eof;
         return;
     }

src/program.h

@@ -19,8 +19,7 @@ typedef enum {
     PutString,
     GetString,
     Clear,
-    Eof,
+    Eof
-    Invalid
 } Symbol;
 
 typedef struct {