Add standout mode.

st.c

@@ -1104,6 +1104,9 @@ tsetattr(int *attr, int l) {
 		case 1:
 			term.c.attr.mode |= ATTR_BOLD;
 			break;
+		case 3: /* enter standout (highlight) mode TODO: make it italic */
+			term.c.attr.mode |= ATTR_REVERSE;
+			break;
 		case 4:
 			term.c.attr.mode |= ATTR_UNDERLINE;
 			break;
@@ -1113,6 +1116,9 @@ tsetattr(int *attr, int l) {
 		case 22:
 			term.c.attr.mode &= ~ATTR_BOLD;
 			break;
+		case 23: /* leave standout (highlight) mode TODO: make it italic */
+			term.c.attr.mode &= ~ATTR_REVERSE;
+			break;
 		case 24:
 			term.c.attr.mode &= ~ATTR_UNDERLINE;
 			break;

st.info

@@ -86,7 +86,7 @@ st| simpleterm,
 	ri=\EM,
 	rmacs=\E(B,
 	rmcup=\E[?1049l,
-	rmso=\E[m,
+	rmso=\E[23m,
 	rmul=\E[m,
 	sc=\E7,
 	setab=\E[4%p1%dm,
@@ -97,7 +97,7 @@ st| simpleterm,
 	sgr=%?%p9%t\E(0%e\E(B%;\E[0%?%p6%t;1%;%?%p2%t;4%;%?%p1%p3%|%t;7%;%?%p4%t;5%;%?%p7%t;8%;m,
 	smacs=\E(0,
 	smcup=\E[?1049h,
-	smso=\E[7m,
+	smso=\E[3m,
 	smul=\E[4m,
 	tbc=\E[3g,
 	tsl=\E]0;,