WIP : Eff it, I left the magic memcpy in. Printing mostly works but it's still broken. Calls to _cputs and _cputsf may mysteriously fail due to some kind of memory corruption I haven't tracked down yet. This commit leaves in a bunch of commented testing code, the next commit will rip them out.

src/basic.c

@@ -16,15 +16,14 @@ char _tokenizer_value[BASIC_TOKENIZER_MAX_LENGTH];
 char *_tokenizer_prev;
 char *_tokenizer_prev_next;
 char basic_memory_lines[BASIC_MAX_LINES][BASIC_MAX_LINE_LENGTH];
-char decimal[32];
 char const_string_test[255];
 
 void basic_report_error(char *prefix)
 {
-  memset((char *)&decimal, 0x00, 32);
   _cputs(prefix);
-  itoa(basic_errno, (char *)&decimal);
-  _cputs((char *)&decimal);
+  memset(decimal, 0x00, 32);
+  itoa(basic_errno, decimal);
+  _cputs(decimal);
   _cputs("\n");
 }
 
@@ -47,32 +46,25 @@ void basic_cmd_list(void *data)
   char *lineptr = NULL;
 
   i = 0;
-  /* I don't know why, but somehow, this makes the interspersed _cputs() calls below work.
-   * Take this out, and those lines stop working.
-   *
-   * WHAT. THE. FUCK.
-   *
-   *
-   * memcpy((char *)&const_string_test, (char *)"            \0", strlen("            \0"));
-   * _cputs((char *)&const_string_test);
+  /* I don't know why, but somehow, this memcpy fixes the bug where _cputs and _cputsf stops properly processing
+   * constant character strings passed as the format string. I've tried lots and lots of things and I still don't
+   * know why this fixes the bug.
    */
-  /* 12 characters of nothing? This does the same thing as the cputs above. 
-   * But cputs is still broken after this. It's the memcpy that is fixing whatever is wrong.
-   */
-  /*for ( i = 0; i < 12; i++ ) {
-    _putch(' ');
-    advanceCursor();
-  }*/
+  memcpy(const_string_test, (char *)"            \0", strlen("            \0"));
   for ( i = 0; i <= limit ; i++ ) {
     if ( basic_memory_lines[i][0] != 0 ) {
-      itoa(i+1, (char *)&decimal);
-      _cputs((char *)&decimal);
+      _cputsf("%d ", (char *)(i+1));
+      /*itoa(i+1, decimal);
+      _cputs(decimal);
       _putch(' ');
-      advanceCursor();
-      _cputs(basic_memory_line_address(i));
+      advanceCursor();*/
+      _cputsf("%s\n", basic_memory_lines[i]);
+      /*_cputs(" ");
+      _cputs(basic_memory_lines[i]);
        _putch('\n');
       _cursor_x = 80;
       advanceCursor();
+      _cputs("\n");*/
     }
   }
 }
@@ -142,7 +134,7 @@ char *_tokenize(char *ptr, char *token)
   orig = ptr;
   numtokens = strlen(token);
 
-  memset(&_tokenizer_value, 0x00, BASIC_TOKENIZER_MAX_LENGTH);
+  memset(_tokenizer_value, 0x00, BASIC_TOKENIZER_MAX_LENGTH);
   while ( *ptr != 0x0 ) {
     /*for ( tokenptr = token ; *tokenptr != 0x00; tokenptr += 1) {
       if ( *ptr == *tokenptr) {
@@ -163,14 +155,14 @@ _tokenize_copy:
     basic_errno = BASIC_ERR_SYNTAX_TOKEN_LENGTH;
     return NULL;
   }
-  memcpy((void *)&_tokenizer_value, (void *)orig, len);
+  memcpy(_tokenizer_value, (void *)orig, len);
   _tokenizer_prev_next = (ptr + 1);
   return ptr;
 }
 
 char *tokenizer_token(void)
 {
-  return (char *)&_tokenizer_value;
+  return _tokenizer_value;
 }
 
 /***************************************************************
@@ -179,11 +171,6 @@ char *tokenizer_token(void)
  * 
  ***************************************************************/
 
-char *basic_memory_line_address(int lineno)
-{
-  return ((char *)&basic_memory_lines) + (lineno * BASIC_MAX_LINE_LENGTH);
-}
-
 int basic_memory_line_store(char *content, int lineno)
 {
   int i = 0;
@@ -195,7 +182,7 @@ int basic_memory_line_store(char *content, int lineno)
     return 1;
   }
 
-  dest = basic_memory_line_address(lineno);
+  /*dest = basic_memory_line_address(lineno);*/
   if ( lineno > basic_last_stored_lineno ) {
     /*
      * basic_last_stored_lineno only every grows upward (even if you go back and edit a line or insert one).
@@ -208,14 +195,14 @@ int basic_memory_line_store(char *content, int lineno)
       /*ptr = basic_memory_line_address(i);*/
       /*memset(ptr, 0x00, BASIC_MAX_LINE_LENGTH);*/
     }
+    basic_last_stored_lineno = lineno;
   }
   lineno -= 1;
-  i = (int) memcpy(basic_memory_line_address(lineno), content, strlen(content));
+  i = (int) memcpy(basic_memory_lines[lineno], content, strlen(content));
   if ( i == 0 ) {
     basic_errno = BASIC_ERR_INTERNAL_NULLPOINTER;
     return 1;
   }
-  basic_last_stored_lineno = lineno;
 }
 
 int basic_run_line_v2(char *codeline, int repl_mode)
@@ -238,7 +225,7 @@ int basic_run_line_v2(char *codeline, int repl_mode)
 
     /* is it a line number? If so, store it and do nothing else.*/
     if ( isdigit(*token) ) {
-      memset((char *)&decimal, 0x00, 32);
+      memset(decimal, 0x00, 32);
       lineno = atoi(token);
       basic_memory_line_store(buffptr, lineno);
       return 0;
@@ -258,8 +245,11 @@ int basic_run_line_v2(char *codeline, int repl_mode)
 
     /* Report errors */
     if ( basic_errno != 0 ) {
-      /*_cputs(token);*/
-      basic_report_error("Parsing error: ");
+      /*_cputs("Last parsed token: ");
+      _cputs(token);
+      _cputs("\n");*/
+      _cputsf("Parsing error: %d", basic_errno);
+      return 1;
     }
 
     /* Move to the next thing in the line and process it */
@@ -307,12 +297,13 @@ void basic_repl(void)
   blankScreen();
   setCursorPosition(0, 0);
 
-  basic_repl_mode = 1;
-  basic_memory_line_store("LIST", 10);
-  basic_memory_line_store("PRINT HELLO\n", 20);
-  basic_memory_line_store("PRINT WORLD\n", 30);
-  basic_memory_line_store("PRINT GOODBYE\n", 40);
-
+  /*
+   * basic_repl_mode = 1;
+   * basic_memory_line_store("LIST", 10);
+   * basic_memory_line_store("PRINT HELLO\\n", 20);
+   * basic_memory_line_store("PRINT WORLD\\n", 30);
+   * basic_memory_line_store("PRINT GOODBYE\\n", 40);
+  */
   _cputs("Piquant Basic v0.1\n");
   _cputs("READY\n");
 
@@ -330,9 +321,9 @@ void basic_repl(void)
       ptr = _tokenize((char *)&basic_memory_lines[39], " ");
       token = tokenizer_token();
       basic_cmd_print(ptr);
-      basic_run_line_v2((char *)&basic_memory_lines[19], 1);
-      basic_run_line_v2((char *)&basic_memory_lines[29], 1);
-      basic_run_line_v2((char *)&basic_memory_lines[39], 1);*/
+      basic_run_line_v2(basic_memory_lines[19], 1);
+      basic_run_line_v2(basic_memory_lines[29], 1);
+      basic_run_line_v2(basic_memory_lines[39], 1);*/
       basic_repl_mode = 0;
     }
     _cputs("\n> ");

src/conio.c

@@ -6,6 +6,8 @@
 #include <stdio.h>
 #endif
 
+char decimal[32];
+
 void _putch(char c)
 {
 #ifndef __GNUC__
@@ -32,12 +34,70 @@ void _cputs(char *ptr)
   if ( ptr == NULL ) {
     return;
   }
-  while ((char)*ptr != 0x0) { 
-    _putch((char)*ptr);
+  while (*ptr != 0x0) {
+    if (*ptr == '\\') {
+      ptr += 1;
+      switch ( *ptr ) {
+        case 'n':
+          _putch('\n');
+          _cursor_x = 80;
+          advanceCursor();
+          break;
+      }
+    } else {
+      _putch(*ptr);
       if (*ptr == '\n') {
         _cursor_x = 80;
       }
       advanceCursor();
+    }
+    ptr += 1;
+  }
+  return;
+}
+
+void _cputsf(char *ptr, char *data)
+{
+  if ( ptr == NULL || data == NULL) {
+    return;
+  }
+ 
+  /*_cputs("_cputsf called with ptr : ");
+  memset(decimal, 0x00, 32);
+  itoa((int)ptr, decimal);
+  _cputs(decimal);
+  _cputs(" (");
+  _cputs(ptr);
+  _cputs(") length ");
+  memset(decimal, 0x00, 32);
+  itoa(strlen(ptr), decimal);
+  _cputs(decimal);
+  _cputs(" data ");
+  memset(decimal, 0x00, 32);
+  itoa((int)data, decimal);
+  _cputs(decimal);
+  _cputs("\n");*/
+
+  while (*ptr != 0) {
+    if ( *ptr == '%' ) {
+      ptr += 1;
+      switch ( *ptr ) {
+        case 'd':
+          memset(decimal, 0x00, 32);
+          itoa((int)data, decimal);
+          _cputs(decimal);
+          break;
+        case 's':
+          _cputs((char *)data);
+          break;
+      }
+    } else {
+      _putch(*ptr);
+      if (*ptr == '\n') {
+        _cursor_x = 80;
+      }
+      advanceCursor();
+    }
     ptr += 1;
   }
   return;

src/conio.h

@@ -4,6 +4,10 @@
 void _putch(char _c);
 char *_cgets(char *d);
 void _cputs(char *d);
+void _cputsf(char *d, char *data);
 char _getkey(char *dest);
 
+
+extern char decimal[32];
+
 #endif /* _CONIO_H_ */