2 * Render C declarations.
3 * Copyright © 2011, 2021, 2023 Nick Bowler
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include "cdecl-internal.h"
29 declare_declarator(char **dst, size_t *dstlen, struct cdecl_declarator *d);
31 static size_t declare_decl(char **dst, size_t *dstlen, struct cdecl *decl)
35 ret = cdecl__emit_specs(dst, dstlen, decl->specifiers, -1);
36 if (decl->declarators->type != CDECL_DECL_NULL)
37 ret += cdecl__emit(dst, dstlen, " ");
39 return ret + declare_declarator(dst, dstlen, decl->declarators);
43 declare_postfix_child(char **dst, size_t *dstlen, struct cdecl_declarator *d)
47 if (d->type == CDECL_DECL_POINTER)
48 ret += cdecl__emit(dst, dstlen, "(");
50 ret += declare_declarator(dst, dstlen, d);
52 if (d->type == CDECL_DECL_POINTER)
53 ret += cdecl__emit(dst, dstlen, ")");
59 declare_pointer(char **dst, size_t *dstlen, struct cdecl_pointer *p)
61 struct cdecl_declspec *q = p->qualifiers;
66 ret = cdecl__emit(dst, dstlen, "* ");
67 ret += cdecl__emit_specs(dst, dstlen, q, -1);
68 return ret + cdecl__emit(dst, dstlen, " ");
71 return cdecl__emit(dst, dstlen, "*");
74 static size_t declare_array(char **dst, size_t *dstlen, struct cdecl_array *a)
78 ret = cdecl__emit(dst, dstlen, "[");
81 const char *s = a->vla[0] ? a->vla : "*";
82 ret += cdecl__emit(dst, dstlen, s);
84 size_t rc = snprintf(*dst, *dstlen, "%.0" PRIuMAX, a->length);
85 ret += cdecl__advance(dst, dstlen, rc);
88 return ret + cdecl__emit(dst, dstlen, "]");
92 declare_function(char **dst, size_t *dstlen, struct cdecl_function *f)
97 ret = cdecl__emit(dst, dstlen, "(");
99 for (p = f->parameters; p; p = p->next) {
100 ret += declare_decl(dst, dstlen, p);
103 ret += cdecl__emit(dst, dstlen, ", ");
104 else if (f->variadic)
105 ret += cdecl__emit(dst, dstlen, ", ...");
108 return ret + cdecl__emit(dst, dstlen, ")");
112 declare_declarator(char **dst, size_t *dstlen, struct cdecl_declarator *d)
116 for (; d; d = d->child) {
118 case CDECL_DECL_NULL:
120 case CDECL_DECL_IDENT:
121 ret += cdecl__emit(dst, dstlen, d->u.ident);
123 case CDECL_DECL_POINTER:
124 ret += declare_pointer(dst, dstlen, &d->u.pointer);
127 * Arrays and functions are special: since they are postfix,
128 * we need to render the children before rendering their
131 case CDECL_DECL_ARRAY:
132 ret += declare_postfix_child(dst, dstlen, d->child);
133 return ret + declare_array(dst, dstlen, &d->u.array);
134 case CDECL_DECL_FUNCTION:
135 ret += declare_postfix_child(dst, dstlen, d->child);
136 return ret + declare_function(dst, dstlen, &d->u.function);
145 size_t cdecl_declare(char *buf, size_t n, struct cdecl *decl)
147 return declare_decl(&buf, &n, decl);