indent(1): add a new option, -ta, to treat all *_t identifiers as types

Submitted by:	Hans Petter Selasky
Discussed with:	bde
MFC after:	10 days

usr.bin/indent/args.c

@@ -157,6 +157,7 @@ struct pro {
     {"sc", PRO_BOOL, true, ON, &star_comment_cont},
     {"sob", PRO_BOOL, false, ON, &swallow_optional_blanklines},
     {"st", PRO_SPECIAL, 0, STDIN, 0},
+    {"ta", PRO_BOOL, false, ON, &auto_typedefs},
     {"troff", PRO_BOOL, false, ON, &troff},
     {"ut", PRO_BOOL, true, ON, &use_tabs},
     {"v", PRO_BOOL, false, ON, &verbose},

usr.bin/indent/indent.1

@@ -80,6 +80,7 @@
 .Op Fl sob | Fl nsob
 .Ek
 .Op Fl \&st
+.Op Fl \&ta
 .Op Fl troff
 .Op Fl ut | Fl nut
 .Op Fl v | Fl \&nv
@@ -377,6 +378,9 @@ Default:
 Causes
 .Nm
 to take its input from stdin and put its output to stdout.
+.It Fl ta
+Automatically add all identifiers ending in "_t" to the list
+of type keywords.
 .It Fl T Ns Ar typename
 Adds
 .Ar typename

usr.bin/indent/indent_globs.h

@@ -204,6 +204,8 @@ int	    function_brace_split;	/* split function declaration and
 					 * brace onto separate lines */
 int	    use_tabs;			/* set true to use tabs for spacing,
 					 * false uses all spaces */
+int	    auto_typedefs;		/* set true to recognize identifiers
+					 * ending in "_t" like typedefs */
 
 /* -troff font state information */
 

usr.bin/indent/lexi.c

@@ -249,6 +249,17 @@ lexi(void)
 	last_code = ident;	/* Remember that this is the code we will
 				 * return */
 
+	if (auto_typedefs) {
+	    const char *q = s_token;
+	    /* Check if we have an "_t" in the end */
+	    if (q[0] && q[1] &&
+	        (strcmp(q + strlen(q) - 2, "_t") == 0)) {
+	        ps.its_a_keyword = true;
+		ps.last_u_d = true;
+	        goto found_auto_typedef;
+	    }
+	}
+
 	/*
 	 * This loop will check if the token is a keyword.
 	 */
@@ -285,6 +296,7 @@ lexi(void)
 		/* FALLTHROUGH */
 
 	    case 4:		/* one of the declaration keywords */
+	    found_auto_typedef:
 		if (ps.p_l_follow) {
 		    ps.cast_mask |= (1 << ps.p_l_follow) & ~ps.sizeof_mask;
 		    break;	/* inside parens: cast, param list or sizeof */