core: use GRUB_TERM_ definitions when handling term characters

* Also use hex value for GRUB_TERM_ESC as '\e' is not in the C standard and is not understood by some compilers

grub-core/commands/keylayouts.c

@@ -40,7 +40,7 @@ static struct grub_keyboard_layout layout_us = {
     /* 0x10 */ 'm',  'n',  'o',  'p',  'q', 'r', 's', 't',
     /* 0x18 */ 'u',  'v',  'w',  'x',  'y', 'z', '1', '2',
     /* 0x20 */ '3',  '4',  '5',  '6',  '7', '8', '9', '0',
-    /* 0x28 */ '\n', '\e', '\b', '\t', ' ', '-', '=', '[',
+    /* 0x28 */ '\n', GRUB_TERM_ESC, GRUB_TERM_BACKSPACE, GRUB_TERM_TAB, ' ', '-', '=', '[',
     /* According to usage table 0x31 should be mapped to '/'
        but testing with real keyboard shows that 0x32 is remapped to '/'.
        Map 0x31 to 0. 
@@ -82,8 +82,8 @@ static struct grub_keyboard_layout layout_us = {
     /* 0x10 */ 'M',  'N',  'O',  'P',  'Q', 'R', 'S', 'T',
     /* 0x18 */ 'U',  'V',  'W',  'X',  'Y', 'Z', '!', '@',
     /* 0x20 */ '#',  '$',  '%',  '^',  '&', '*', '(', ')',
-    /* 0x28 */ '\n' | GRUB_TERM_SHIFT, '\e' | GRUB_TERM_SHIFT, 
-    /* 0x2a */ '\b' | GRUB_TERM_SHIFT, '\t' | GRUB_TERM_SHIFT, 
+    /* 0x28 */ '\n' | GRUB_TERM_SHIFT, GRUB_TERM_ESC | GRUB_TERM_SHIFT,
+    /* 0x2a */ GRUB_TERM_BACKSPACE | GRUB_TERM_SHIFT, GRUB_TERM_TAB | GRUB_TERM_SHIFT,
     /* 0x2c */ ' '  | GRUB_TERM_SHIFT,  '_', '+', '{',
     /* According to usage table 0x31 should be mapped to '/'
        but testing with real keyboard shows that 0x32 is remapped to '/'.

grub-core/commands/menuentry.c

@@ -52,8 +52,8 @@ static struct
   int key;
 } hotkey_aliases[] =
   {
-    {"backspace", '\b'},
-    {"tab", '\t'},
+    {"backspace", GRUB_TERM_BACKSPACE},
+    {"tab", GRUB_TERM_TAB},
     {"delete", GRUB_TERM_KEY_DC},
     {"insert", GRUB_TERM_KEY_INSERT},
     {"f1", GRUB_TERM_KEY_F1},

grub-core/lib/crypto.c

@@ -462,7 +462,7 @@ grub_password_get (char buf[], unsigned buf_size)
       if (key == '\n' || key == '\r')
 	break;
 
-      if (key == '\e')
+      if (key == GRUB_TERM_ESC)
 	{
 	  cur_len = 0;
 	  break;
@@ -487,7 +487,7 @@ grub_password_get (char buf[], unsigned buf_size)
   grub_xputs ("\n");
   grub_refresh ();
 
-  return (key != '\e');
+  return (key != GRUB_TERM_ESC);
 }
 #endif
 

grub-core/normal/auth.c

@@ -166,13 +166,13 @@ grub_username_get (char buf[], unsigned buf_size)
       if (key == '\n' || key == '\r')
 	break;
 
-      if (key == '\e')
+      if (key == GRUB_TERM_ESC)
 	{
 	  cur_len = 0;
 	  break;
 	}
 
-      if (key == '\b')
+      if (key == GRUB_TERM_BACKSPACE)
 	{
 	  if (cur_len)
 	    {
@@ -197,7 +197,7 @@ grub_username_get (char buf[], unsigned buf_size)
   grub_xputs ("\n");
   grub_refresh ();
 
-  return (key != '\e');
+  return (key != GRUB_TERM_ESC);
 }
 
 grub_err_t

grub-core/normal/cmdline.c

@@ -626,12 +626,12 @@ grub_cmdline_get (const char *prompt_translated)
 	    cl_insert (cl_terms, nterms, &lpos, &llen, &max_len, &buf, kill_buf);
 	  break;
 
-	case '\e':
+	case GRUB_TERM_ESC:
 	  grub_free (cl_terms);
 	  grub_free (buf);
 	  return 0;
 
-	case '\b':
+	case GRUB_TERM_BACKSPACE:
 	  if (lpos > 0)
 	    {
 	      lpos--;

grub-core/normal/menu.c

@@ -763,7 +763,7 @@ run_menu (grub_menu_t menu, int nested, int *auto_boot)
               *auto_boot = 0;
 	      return current_entry;
 
-	    case '\e':
+	    case GRUB_TERM_ESC:
 	      if (nested)
 		{
 		  menu_fini ();

grub-core/normal/menu_entry.c

@@ -1403,7 +1403,7 @@ grub_menu_entry_run (grub_menu_entry_t entry)
 	    goto fail;
 	  break;
 
-	case '\e':
+	case GRUB_TERM_ESC:
 	  destroy_screen (screen);
 	  return;
 

grub-core/term/efi/console.c

@@ -104,7 +104,7 @@ const unsigned efi_codes[] =
     GRUB_TERM_KEY_DC, GRUB_TERM_KEY_PPAGE, GRUB_TERM_KEY_NPAGE, GRUB_TERM_KEY_F1,
     GRUB_TERM_KEY_F2, GRUB_TERM_KEY_F3, GRUB_TERM_KEY_F4, GRUB_TERM_KEY_F5,
     GRUB_TERM_KEY_F6, GRUB_TERM_KEY_F7, GRUB_TERM_KEY_F8, GRUB_TERM_KEY_F9,
-    GRUB_TERM_KEY_F10, GRUB_TERM_KEY_F11, GRUB_TERM_KEY_F12, '\e'
+    GRUB_TERM_KEY_F10, GRUB_TERM_KEY_F11, GRUB_TERM_KEY_F12, GRUB_TERM_ESC
   };
 
 static int

grub-core/term/i386/pc/console.c

@@ -204,7 +204,7 @@ static int
 grub_console_getkey (struct grub_term_input *term __attribute__ ((unused)))
 {
   const grub_uint16_t bypass_table[] = {
-    0x0100 | '\e', 0x0f00 | '\t', 0x0e00 | '\b', 0x1c00 | '\r', 0x1c00 | '\n'
+    0x0100 | GRUB_TERM_ESC, 0x0f00 | GRUB_TERM_TAB, 0x0e00 | GRUB_TERM_BACKSPACE, 0x1c00 | '\r', 0x1c00 | '\n'
   };
   struct grub_bios_int_registers regs;
   unsigned i;

grub-core/term/terminfo.c

@@ -426,12 +426,12 @@ grub_terminfo_readkey (struct grub_term_input *term, int *keys, int *len,
     }
   *len = 1;
   keys[0] = c;
-  if (c != ANSI_CSI && c != '\e')
+  if (c != ANSI_CSI && c != GRUB_TERM_ESC)
     {
       /* Backspace: Ctrl-h.  */
       if (c == 0x7f)
-	c = '\b'; 
-      if (c < 0x20 && c != '\t' && c!= '\b' && c != '\n' && c != '\r')
+	c = GRUB_TERM_BACKSPACE;
+      if (c < 0x20 && c != GRUB_TERM_TAB && c!= GRUB_TERM_BACKSPACE && c != '\n' && c != '\r')
 	c = GRUB_TERM_CTRL | (c - 1 + 'a');
       *len = 1;
       keys[0] = c;
@@ -487,7 +487,7 @@ grub_terminfo_readkey (struct grub_term_input *term, int *keys, int *len,
 	  GRUB_TERM_KEY_HOME, GRUB_TERM_KEY_END };
     unsigned i;
 
-    if (c == '\e')
+    if (c == GRUB_TERM_ESC)
       {
 	CONTINUE_READ;
 
@@ -606,7 +606,7 @@ grub_terminfo_getkey (struct grub_term_input *termi)
 			 &data->npending, data->readkey);
 
 #if defined(__powerpc__) && defined(GRUB_MACHINE_IEEE1275)
-  if (data->npending == 1 && data->input_buf[0] == '\e'
+  if (data->npending == 1 && data->input_buf[0] == GRUB_TERM_ESC
       && grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_BROKEN_REPEAT)
       && grub_get_time_ms () - data->last_key_time < 1000
       && (data->last_key & GRUB_TERM_EXTENDED))

grub-core/tests/cmdline_cat_test.c

@@ -103,7 +103,7 @@ cmdline_cat_test (void)
 					     '/', 't', 'e', 's', 't', '.',
 					     't', 'x', 't', '\n',
 					     GRUB_TERM_NO_KEY,
-					     GRUB_TERM_NO_KEY, '\e'},
+					     GRUB_TERM_NO_KEY, GRUB_TERM_ESC},
 					 23);
 
       grub_video_checksum ("cmdline_cat");

grub-core/tests/gfxterm_menu.c

@@ -146,7 +146,7 @@ gfxterm_menu (void)
 	    return;
 	  }
 	grub_terminal_input_fake_sequence ((int []) { -1, -1, -1, GRUB_TERM_KEY_DOWN, -1, 'e',
-	      -1, GRUB_TERM_KEY_RIGHT, -1, 'x', -1,  '\e', -1, '\e' }, 14);
+	      -1, GRUB_TERM_KEY_RIGHT, -1, 'x', -1,  GRUB_TERM_ESC, -1, GRUB_TERM_ESC }, 14);
 
 	grub_video_checksum (tests[j].name);
 

include/grub/term.h

@@ -55,7 +55,8 @@
 #define GRUB_TERM_KEY_INSERT    (GRUB_TERM_EXTENDED | 0x52)
 #define GRUB_TERM_KEY_CENTER    (GRUB_TERM_EXTENDED | 0x4c)
 
-#define GRUB_TERM_ESC		'\e'
+/* Hex value is used for ESC, since '\e' is nonstandard */
+#define GRUB_TERM_ESC		0x1b
 #define GRUB_TERM_TAB		'\t'
 #define GRUB_TERM_BACKSPACE	'\b'