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Fix bug with macro invocation with empty first arg

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The first argument was being dropped in this case.
This commit is contained in:
Olly Betts 2017-10-05 11:16:41 +13:00
commit f85d87a64c
4 changed files with 12 additions and 19 deletions
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15
Source/Preprocessor/cpp.c
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@ -640,13 +640,8 @@ static List *find_args(String *s, int ismacro, String *macro_name) {
goto unterm;
}
Chop(str);
if (Len(args) || Len(str))
Append(args, str);
Append(args, str);
Delete(str);
/* if (Len(str) && (c != ')'))
Append(args,str); */
if (c == ')')
return args;
c = Getc(s);
@ -818,14 +813,16 @@ static String *expand_macro(String *name, List *args, String *line_file) {
}
}
if (args && margs && Len(margs) == 1 && Len(args) == 0) {
if (args && margs && Len(margs) == 0 && Len(args) == 1 && Len(Getitem(args, 0)) == 0) {
/* FOO() can invoke a macro defined as FOO(X) as well as one defined FOO().
* Handle this by adding an empty argument to args.
*
* Handle this by removing the only argument if it's empty and the macro
* expects no arguments.
*
* We don't need to worry about varargs here - a varargs macro will always have
* Len(margs) >= 1, since the varargs are put in the final macro argument.
*/
Append(args, NewStringEmpty());
Delitem(args, 0);
}
/* If there are arguments, see if they match what we were given */