preproc: add %i... variants, evaluated macro parameters, cleanupsevalmacro

All directives which create single-line macros now have %i... variants
to define case-insensitive versions. Case insensitive rather sucks,
but at least this way it is consistent.

Single-line macro parameters can now be evaluated as a number, as done
by %assign. To do so, declare a parameter starting with =, for
example:

%define foo(x,=y) mov [x],macro_array_y

... would evaluate y as a number but leave x as a string.

NOTE: it would arguably be better to have this as a per-instance
basis, but it is easily handled by having a secondary macro called
with the same argument twice.

Finally, add a more consistent method for defining "magic" macros,
which need to be evaluated at runtime. For now, it is only used by the
special macros __FILE__, __LINE__, __BITS__, __PTR__, and __PASS__.

__PTR__ is a new macro which evaluates to word, dword or qword
matching the value of __BITS__.

The magic macro framework, however, provides a natural hook for a
future plug-in infrastructure to hook into a scripting language.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/asm/quote.c b/asm/quote.c
index 75a93726..813141b3 100644
--- a/asm/quote.c
+++ b/asm/quote.c
@@ -217,6 +217,14 @@ static char *emit_utf8(char *q, int32_t v)
 }
 
 /*
+ * Quote a C string
+ */
+char *nasm_quote_cstr(const char *str)
+{
+    return nasm_quote(str, strlen(str));
+}
+
+/*
  * Do an *in-place* dequoting of the specified string, returning the
  * resulting length (which may be containing embedded nulls.)
  *