/*
* Render C declarations.
* Copyright © 2011, 2021, 2023 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 .
*/
#include
#include
#include
#include
#include
#include "cdecl.h"
#include "cdecl-internal.h"
static void
declare_declarator(struct output_state *dst, struct cdecl_declarator *d);
static void declare_decl(struct output_state *dst, struct cdecl *decl)
{
const char *sep;
sep = cdecl__emit_specs(dst, decl->specifiers, -1);
if (decl->declarators->type != CDECL_DECL_NULL)
cdecl__emit(dst, sep);
declare_declarator(dst, decl->declarators);
}
static void
declare_postfix_child(struct output_state *dst, struct cdecl_declarator *d)
{
if (d->type == CDECL_DECL_POINTER)
cdecl__emit(dst, "(");
declare_declarator(dst, d);
if (d->type == CDECL_DECL_POINTER)
cdecl__emit(dst, ")");
}
static void declare_pointer(struct output_state *dst, struct cdecl_pointer *p)
{
struct cdecl_declspec *q = p->qualifiers;
if (q) {
cdecl__emit(dst, "* ");
cdecl__emit_specs(dst, q, -1);
cdecl__emit(dst, " ");
} else {
cdecl__emit(dst, "*");
}
}
static void declare_array(struct output_state *dst, struct cdecl_array *a)
{
cdecl__emit(dst, "[");
if (a->vla) {
const char *s = a->vla[0] ? a->vla : "*";
cdecl__emit(dst, s);
} else {
cdecl__emit_uint(dst, a->length);
}
cdecl__emit(dst, "]");
}
static void
declare_function(struct output_state *dst, struct cdecl_function *f)
{
struct cdecl *p;
cdecl__emit(dst, "(");
for (p = f->parameters; p; p = p->next) {
declare_decl(dst, p);
if (p->next)
cdecl__emit(dst, ", ");
else if (f->variadic)
cdecl__emit(dst, ", ...");
}
cdecl__emit(dst, ")");
}
static void
declare_declarator(struct output_state *dst, struct cdecl_declarator *d)
{
for (; d; d = d->child) {
switch (d->type) {
case CDECL_DECL_NULL:
break;
case CDECL_DECL_IDENT:
cdecl__emit(dst, d->u.ident);
break;
case CDECL_DECL_POINTER:
declare_pointer(dst, &d->u.pointer);
break;
/*
* Arrays and functions are special: since they are postfix,
* we need to render the children before rendering their
* "bodies".
*/
case CDECL_DECL_ARRAY:
declare_postfix_child(dst, d->child);
declare_array(dst, &d->u.array);
return;
case CDECL_DECL_FUNCTION:
declare_postfix_child(dst, d->child);
declare_function(dst, &d->u.function);
return;
default:
assert(0);
}
}
}
size_t cdecl_declare(char *buf, size_t n, struct cdecl *decl)
{
struct output_state dst = { buf, n };
declare_decl(&dst, decl);
return dst.accum;
}