tty: vt: define an enum for CSI+m codes

It's always confusing to read all those case 0:, case 1: etc. in csi_*
handlers. Define enum entries for all those constants in CSI+m and use
them in csi_m().
Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Tested-by: Helge Deller <deller@gmx.de> # parisc STI console
Link: https://lore.kernel.org/r/20240122110401.7289-10-jirislaby@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/vt/vt.c

@@ -1676,6 +1676,39 @@ static int vc_t416_color(struct vc_data *vc, int i,
 	return i;
 }
 
+enum {
+	CSI_m_DEFAULT			= 0,
+	CSI_m_BOLD			= 1,
+	CSI_m_HALF_BRIGHT		= 2,
+	CSI_m_ITALIC			= 3,
+	CSI_m_UNDERLINE			= 4,
+	CSI_m_BLINK			= 5,
+	CSI_m_REVERSE			= 7,
+	CSI_m_PRI_FONT			= 10,
+	CSI_m_ALT_FONT1			= 11,
+	CSI_m_ALT_FONT2			= 12,
+	CSI_m_DOUBLE_UNDERLINE		= 21,
+	CSI_m_NORMAL_INTENSITY		= 22,
+	CSI_m_NO_ITALIC			= 23,
+	CSI_m_NO_UNDERLINE		= 24,
+	CSI_m_NO_BLINK			= 25,
+	CSI_m_NO_REVERSE		= 27,
+	CSI_m_FG_COLOR_BEG		= 30,
+	CSI_m_FG_COLOR_END		= 37,
+	CSI_m_FG_COLOR			= 38,
+	CSI_m_DEFAULT_FG_COLOR		= 39,
+	CSI_m_BG_COLOR_BEG		= 40,
+	CSI_m_BG_COLOR_END		= 47,
+	CSI_m_BG_COLOR			= 48,
+	CSI_m_DEFAULT_BG_COLOR		= 49,
+	CSI_m_BRIGHT_FG_COLOR_BEG	= 90,
+	CSI_m_BRIGHT_FG_COLOR_END	= 97,
+	CSI_m_BRIGHT_FG_COLOR_OFF	= CSI_m_BRIGHT_FG_COLOR_BEG - CSI_m_FG_COLOR_BEG,
+	CSI_m_BRIGHT_BG_COLOR_BEG	= 100,
+	CSI_m_BRIGHT_BG_COLOR_END	= 107,
+	CSI_m_BRIGHT_BG_COLOR_OFF	= CSI_m_BRIGHT_BG_COLOR_BEG - CSI_m_BG_COLOR_BEG,
+};
+
 /* console_lock is held */
 static void csi_m(struct vc_data *vc)
 {
@@ -1683,33 +1716,33 @@ static void csi_m(struct vc_data *vc)
 
 	for (i = 0; i <= vc->vc_npar; i++)
 		switch (vc->vc_par[i]) {
-		case 0:	/* all attributes off */
+		case CSI_m_DEFAULT:	/* all attributes off */
 			default_attr(vc);
 			break;
-		case 1:
+		case CSI_m_BOLD:
 			vc->state.intensity = VCI_BOLD;
 			break;
-		case 2:
+		case CSI_m_HALF_BRIGHT:
 			vc->state.intensity = VCI_HALF_BRIGHT;
 			break;
-		case 3:
+		case CSI_m_ITALIC:
 			vc->state.italic = true;
 			break;
-		case 21:
+		case CSI_m_DOUBLE_UNDERLINE:
 			/*
 			 * No console drivers support double underline, so
 			 * convert it to a single underline.
 			 */
-		case 4:
+		case CSI_m_UNDERLINE:
 			vc->state.underline = true;
 			break;
-		case 5:
+		case CSI_m_BLINK:
 			vc->state.blink = true;
 			break;
-		case 7:
+		case CSI_m_REVERSE:
 			vc->state.reverse = true;
 			break;
-		case 10: /* ANSI X3.64-1979 (SCO-ish?)
+		case CSI_m_PRI_FONT: /* ANSI X3.64-1979 (SCO-ish?)
 			  * Select primary font, don't display control chars if
 			  * defined, don't set bit 8 on output.
 			  */
@@ -1717,7 +1750,7 @@ static void csi_m(struct vc_data *vc)
 			vc->vc_disp_ctrl = 0;
 			vc->vc_toggle_meta = 0;
 			break;
-		case 11: /* ANSI X3.64-1979 (SCO-ish?)
+		case CSI_m_ALT_FONT1: /* ANSI X3.64-1979 (SCO-ish?)
 			  * Select first alternate font, lets chars < 32 be
 			  * displayed as ROM chars.
 			  */
@@ -1725,7 +1758,7 @@ static void csi_m(struct vc_data *vc)
 			vc->vc_disp_ctrl = 1;
 			vc->vc_toggle_meta = 0;
 			break;
-		case 12: /* ANSI X3.64-1979 (SCO-ish?)
+		case CSI_m_ALT_FONT2: /* ANSI X3.64-1979 (SCO-ish?)
 			  * Select second alternate font, toggle high bit
 			  * before displaying as ROM char.
 			  */
@@ -1733,47 +1766,54 @@ static void csi_m(struct vc_data *vc)
 			vc->vc_disp_ctrl = 1;
 			vc->vc_toggle_meta = 1;
 			break;
-		case 22:
+		case CSI_m_NORMAL_INTENSITY:
 			vc->state.intensity = VCI_NORMAL;
 			break;
-		case 23:
+		case CSI_m_NO_ITALIC:
 			vc->state.italic = false;
 			break;
-		case 24:
+		case CSI_m_NO_UNDERLINE:
 			vc->state.underline = false;
 			break;
-		case 25:
+		case CSI_m_NO_BLINK:
 			vc->state.blink = false;
 			break;
-		case 27:
+		case CSI_m_NO_REVERSE:
 			vc->state.reverse = false;
 			break;
-		case 38:
+		case CSI_m_FG_COLOR:
 			i = vc_t416_color(vc, i, rgb_foreground);
 			break;
-		case 48:
+		case CSI_m_BG_COLOR:
 			i = vc_t416_color(vc, i, rgb_background);
 			break;
-		case 39:
+		case CSI_m_DEFAULT_FG_COLOR:
 			vc->state.color = (vc->vc_def_color & 0x0f) |
 				(vc->state.color & 0xf0);
 			break;
-		case 49:
+		case CSI_m_DEFAULT_BG_COLOR:
 			vc->state.color = (vc->vc_def_color & 0xf0) |
 				(vc->state.color & 0x0f);
 			break;
 		default:
-			if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
-				if (vc->vc_par[i] < 100)
+			if (vc->vc_par[i] >= CSI_m_BRIGHT_FG_COLOR_BEG &&
+			    vc->vc_par[i] <= CSI_m_BRIGHT_BG_COLOR_END) {
+				if (vc->vc_par[i] < CSI_m_BRIGHT_BG_COLOR_BEG)
 					vc->state.intensity = VCI_BOLD;
-				vc->vc_par[i] -= 60;
+				vc->vc_par[i] -= CSI_m_BRIGHT_FG_COLOR_OFF;
 			}
-			if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
-				vc->state.color = color_table[vc->vc_par[i] - 30]
-					| (vc->state.color & 0xf0);
-			else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
-				vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
-					| (vc->state.color & 0x0f);
+			if (vc->vc_par[i] >= CSI_m_FG_COLOR_BEG &&
+			    vc->vc_par[i] <= CSI_m_FG_COLOR_END) {
+				vc->vc_par[i] -= CSI_m_FG_COLOR_BEG;
+				vc->state.color = color_table[vc->vc_par[i]] |
+					(vc->state.color & 0xf0);
+			} else if (vc->vc_par[i] >= CSI_m_BG_COLOR_BEG &&
+				 vc->vc_par[i] <= CSI_m_BG_COLOR_END) {
+				vc->vc_par[i] -= CSI_m_BG_COLOR_BEG;
+				vc->state.color = (color_table[vc->vc_par[i]] << 4) |
+					(vc->state.color & 0x0f);
+			}
+
 			break;
 		}
 	update_attr(vc);