# HG changeset patch
# User David A. Holland
# Date 1370989961 14400
# Node ID 64c4de3709de9574298b3ea80a45373fe9e57e96
# Parent  103acee239e05aa0c3d34784e655a29c14441756
Complain if -[DIU] is given an empty argument.
(Like many compilers over the years, we don't accept the argument
appearing in the next argv word.)

Warn about this in the man page too.

diff -r 103acee239e0 -r 64c4de3709de main.c
--- a/main.c	Tue Jun 11 18:02:13 2013 -0400
+++ b/main.c	Tue Jun 11 18:32:41 2013 -0400
@@ -134,6 +134,11 @@
 	struct place p2;
 	char *val;
 
+	if (*str == '\0') {
+		warnx("-D: macro name expected");
+		die();
+	}
+
 	val = strchr(str, '=');
 	if (val != NULL) {
 		*val = '\0';
@@ -153,6 +158,10 @@
 void
 commandline_undef(const struct place *p, char *str)
 {
+	if (*str == '\0') {
+		warnx("-D: macro name expected");
+		die();
+	}
 	commandline_macro_add(p, str, p, NULL);
 }
 
@@ -343,6 +352,10 @@
 void
 commandline_addincpath(struct stringarray *arr, char *s)
 {
+	if (*s == '\0') {
+		warnx("Empty include path");
+		die();
+	}
 	stringarray_add(arr, s, NULL);
 }
 
diff -r 103acee239e0 -r 64c4de3709de tradcpp.1
--- a/tradcpp.1	Tue Jun 11 18:02:13 2013 -0400
+++ b/tradcpp.1	Tue Jun 11 18:32:41 2013 -0400
@@ -77,8 +77,18 @@
 If no expansion is provided, the value
 .Dq 1
 is used.
+Note that like many Unix compilers,
+.Nm
+does not accept a space between the
+.Dq D
+and the macro name.
 .It Fl Ipath
 Add the specified path to the main list of include directories.
+Note that like many Unix compilers,
+.Nm
+does not accept a space between the
+.Dq I
+and the directory name.
 .It Fl nostdinc
 Do not search the standard system include directories.
 .It Fl P
@@ -87,6 +97,11 @@
 option has no effect.
 .It Fl Umacro
 Remove any existing defintion for the named macro.
+Note that like many Unix compilers,
+.Nm
+does not accept a space between the
+.Dq U
+and the macro name.
 .It Fl undef
 Remove all predefined macros.
 .El