Builtin macros are defined via the add_pre_buffer() mechanism
which is quite powerful/flexible but for small, simple builtin
macros, it's a bit sad to have to compose a buffer and then
tokenize it when it would be easy to directly define these macros.
Add a new function, predefine(), which allows to directly add
a definition for a simple macro, taking no args and having
a single number or identifier as definition.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
lib.h | 1 +
pre-process.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/lib.h b/lib.h
index 0e5f3e4a8..4ea6c6423 100644
--- a/lib.h
+++ b/lib.h
@@ -130,6 +130,7 @@ enum phase {
extern void add_pre_buffer(const char *fmt, ...) FORMAT_ATTR(1);
+extern void predefine(const char *name, int weak, const char *, ...) FORMAT_ATTR(3);
extern int preprocess_only;
diff --git a/pre-process.c b/pre-process.c
index f1ee36cec..e1550cdb4 100644
--- a/pre-process.c
+++ b/pre-process.c
@@ -1380,6 +1380,44 @@ out:
return ret;
}
+///
+// predefine a macro with a printf-formatted value
+// @name: the name of the macro
+// @weak: 0/1 for a normal or a weak define
+// @fmt: the printf format followed by it's arguments.
+//
+// The type of the value is automatically infered:
+// TOKEN_NUMBER if it starts by a digit, TOKEN_IDENT otherwise.
+// If @fmt is null or empty, the macro is defined with an empty definition.
+void predefine(const char *name, int weak, const char *fmt, ...)
+{
+ struct ident *ident = built_in_ident(name);
+ struct token *value = &eof_token_entry;
+ int attr = weak ? SYM_ATTR_WEAK : SYM_ATTR_NORMAL;
+
+ if (fmt && fmt[0]) {
+ static char buf[256];
+ va_list ap;
+
+ va_start(ap, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, ap);
+ va_end(ap);
+
+ value = __alloc_token(0);
+ if (isdigit(buf[0])) {
+ token_type(value) = TOKEN_NUMBER;
+ value->number = xstrdup(buf);
+ } else {
+ token_type(value) = TOKEN_IDENT;
+ value->ident = built_in_ident(buf);
+ }
+ value->pos.whitespace = 1;
+ value->next = &eof_token_entry;
+ }
+
+ do_define(value->pos, NULL, ident, NULL, value, attr);
+}
+
static int do_handle_define(struct stream *stream, struct token **line, struct token *token, int attr)
{
struct token *arglist, *expansion;
--
2.17.1
--
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