/*
* Render C declarations.
* Copyright © 2011 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 "cdecl.h"
#include "output.h"
static size_t declare_specs(char *buf, size_t n, struct cdecl_declspec *s)
{
size_t ret = 0, rc;
if (!s)
return 0;
rc = cdecl__explain_pre_specs(buf, n, s);
ret += cdecl__advance(&buf, &n, rc);
rc = cdecl__explain_post_specs(buf, n, s);
return ret + rc;
}
static size_t
declare_declarator(char *buf, size_t n, struct cdecl_declarator *d);
static size_t declare_decl(char *buf, size_t n, struct cdecl *decl)
{
size_t ret = 0, rc;
rc = declare_specs(buf, n, decl->specifiers);
if (decl->declarators->type != CDECL_DECL_NULL)
ret += cdecl__advance(&buf, &n, rc);
else
ret += cdecl__advance_(&buf, &n, rc);
return ret + declare_declarator(buf, n, decl->declarators);
}
static size_t
declare_postfix_child(char *buf, size_t n, struct cdecl_declarator *d)
{
size_t ret = 0, rc;
if (d->type == CDECL_DECL_POINTER) {
rc = snprintf(buf, n, "(");
ret += cdecl__advance_(&buf, &n, rc);
}
rc = declare_declarator(buf, n, d);
ret += cdecl__advance_(&buf, &n, rc);
if (d->type == CDECL_DECL_POINTER) {
rc = snprintf(buf, n, ")");
ret += cdecl__advance_(&buf, &n, rc);
}
return ret;
}
static size_t declare_pointer(char *buf, size_t n, struct cdecl_pointer *p)
{
size_t ret = 0, rc;
rc = snprintf(buf, n, "*");
if (p->qualifiers)
ret += cdecl__advance(&buf, &n, rc);
else
ret += cdecl__advance_(&buf, &n, rc);
rc = cdecl__explain_specs(buf, n, p->qualifiers, CDECL_SPEC_QUAL);
return ret + rc;
}
static bool pointer_needs_space(struct cdecl_declarator *d)
{
assert(d->type == CDECL_DECL_POINTER);
if (d->u.pointer.qualifiers)
return d->child->type != CDECL_DECL_NULL;
return false;
}
static size_t declare_array(char *buf, size_t n, struct cdecl_array *a)
{
size_t ret = 0, rc;
rc = snprintf(buf, n, "[");
ret += cdecl__advance_(&buf, &n, rc);
if (a->vla)
rc = snprintf(buf, n, "%s", a->vla[0] ? a->vla : "*");
else
rc = snprintf(buf, n, "%.0ju", a->length);
ret += cdecl__advance_(&buf, &n, rc);
return ret + snprintf(buf, n, "]");
}
static size_t declare_function(char *buf, size_t n, struct cdecl_function *f)
{
size_t ret = 0, rc;
rc = snprintf(buf, n, "(");
ret += cdecl__advance_(&buf, &n, rc);
for (struct cdecl *p = f->parameters; p; p = p->next) {
rc = declare_decl(buf, n, p);
ret += cdecl__advance_(&buf, &n, rc);
rc = 0;
if (p->next)
rc = snprintf(buf, n, ", ");
else if (f->variadic)
rc = snprintf(buf, n, ", ...");
ret += cdecl__advance_(&buf, &n, rc);
}
return ret + snprintf(buf, n, ")");
}
static size_t
declare_declarator(char *buf, size_t n, struct cdecl_declarator *d)
{
size_t ret = 0, rc;
for (; d; d = d->child) {
switch (d->type) {
case CDECL_DECL_NULL:
break;
case CDECL_DECL_IDENT:
rc = snprintf(buf, n, "%s", d->u.ident);
ret += cdecl__advance_(&buf, &n, rc);
break;
case CDECL_DECL_POINTER:
rc = declare_pointer(buf, n, &d->u.pointer);
if (pointer_needs_space(d))
ret += cdecl__advance(&buf, &n, rc);
else
ret += cdecl__advance_(&buf, &n, rc);
break;
/*
* Arrays and functions are special: since they are postfix,
* we need to render the children before rendering their
* "bodies".
*/
case CDECL_DECL_ARRAY:
rc = declare_postfix_child(buf, n, d->child);
ret += cdecl__advance_(&buf, &n, rc);
return ret + declare_array(buf, n, &d->u.array);
case CDECL_DECL_FUNCTION:
rc = declare_postfix_child(buf, n, d->child);
ret += cdecl__advance_(&buf, &n, rc);
return ret + declare_function(buf, n, &d->u.function);
default:
assert(0);
}
}
return ret;
}
size_t cdecl_declare(char *buf, size_t n, struct cdecl *decl)
{
return declare_decl(buf, n, decl);
}