Generate specifier strings directly from cdecl.h

[cdecl99.git] / src / output.c

diff --git a/src/output.c b/src/output.c
index 8c2cd0b6b1b4e9b9fe2d2934f6538d95abdb4be4..f691765ea592187d038b3d1dd16a2e080bef41b7 100644 (file)
--- a/src/output.c
+++ b/src/output.c
@@ -1,5 +1,26 @@
+/*
+ *  Helper functions for outputting text.
+ *  Copyright © 2011, 2021 Nick Bowler
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <config.h>
 #include <stdio.h>
-#include "output.h"
+#include <assert.h>
+
+#include "cdecl.h"
+#include "cdecl-internal.h"
 
 size_t cdecl__advance_(char **buf, size_t *n, size_t amount)
 {
@@ -25,3 +46,52 @@ size_t cdecl__advance(char **buf, size_t *n, size_t amount)
        rc = snprintf(*buf, *n, " ");
        return ret + cdecl__advance_(buf, n, rc);
 }
+
+#include "specstr.h"
+
+static size_t explain_spec(char *buf, size_t n, struct cdecl_declspec *s)
+{
+       const char *keyword = spec_string(s->type);
+
+       if (keyword[0] && s->ident)
+               return snprintf(buf, n, "%s %s", keyword, s->ident);
+       else if (s->ident)
+               return snprintf(buf, n, "%s", s->ident);
+       return snprintf(buf, n, "%s", keyword);
+}
+
+/*
+ * Render a list of declaration specifiers.  Only the declaration specifiers
+ * listed in mask, which is the bitwise OR of the desired specifier kinds, are
+ * printed.
+ */
+size_t cdecl__explain_specs(char *buf, size_t n, struct cdecl_declspec *s,
+                                                 unsigned mask)
+{
+       size_t ret = 0, rc = 0;
+
+       for (struct cdecl_declspec *c = s; c; c = c->next) {
+               switch (cdecl_spec_kind(c) & mask) {
+               case CDECL_SPEC_FUNC:
+               case CDECL_SPEC_STOR:
+               case CDECL_SPEC_QUAL:
+               case CDECL_SPEC_TYPE:
+                       ret += cdecl__advance(&buf, &n, rc);
+                       rc = explain_spec(buf, n, c);
+               }
+       }
+
+       return ret + rc;
+}
+
+/* Renders the storage-class and function specifiers in canonical form. */
+size_t cdecl__explain_pre_specs(char *buf, size_t n, struct cdecl_declspec *s)
+{
+       return cdecl__explain_specs(buf, n, s, CDECL_SPEC_FUNC|CDECL_SPEC_STOR);
+}
+
+/* Renders the type qualifiers and type specifiers in canonical form. */
+size_t cdecl__explain_post_specs(char *buf, size_t n, struct cdecl_declspec *s)
+{
+       return cdecl__explain_specs(buf, n, s, CDECL_SPEC_QUAL|CDECL_SPEC_TYPE);
+}