1/*	$OpenBSD: look.c,v 1.22 2010/09/07 19:58:09 marco Exp $	*/
2
3/*
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ozan Yigit at York University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37/*
38 * look.c
39 * Facility: m4 macro processor
40 * by: oz
41 */
42
43#include <sys/types.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <stdint.h>
47#include <stddef.h>
48#include <string.h>
49#include <ohash.h>
50#include "mdef.h"
51#include "stdd.h"
52#include "extern.h"
53
54static void *hash_alloc(size_t, void *);
55static void hash_free(void *, size_t, void *);
56static void *element_alloc(size_t, void *);
57static void setup_definition(struct macro_definition *, const char *,
58    const char *);
59
60static struct ohash_info macro_info = {
61	offsetof(struct ndblock, name),
62	NULL, hash_alloc, hash_free, element_alloc };
63
64struct ohash macros;
65
66/* Support routines for hash tables.  */
67void *
68hash_alloc(size_t s, __unused void *u)
69{
70	void *storage = xalloc(s, "hash alloc");
71	if (storage)
72		memset(storage, 0, s);
73	return storage;
74}
75
76void
77hash_free(void *p, __unused size_t s, __unused void *u)
78{
79	free(p);
80}
81
82void *
83element_alloc(size_t s, __unused void *u)
84{
85	return xalloc(s, "element alloc");
86}
87
88void
89init_macros(void)
90{
91	ohash_init(&macros, 10, &macro_info);
92}
93
94/*
95 * find name in the hash table
96 */
97ndptr
98lookup(const char *name)
99{
100	return ohash_find(&macros, ohash_qlookup(&macros, name));
101}
102
103struct macro_definition *
104lookup_macro_definition(const char *name)
105{
106	ndptr p;
107
108	p = ohash_find(&macros, ohash_qlookup(&macros, name));
109	if (p)
110		return p->d;
111	else
112		return NULL;
113}
114
115static void
116setup_definition(struct macro_definition *d, const char *defn, const char *name)
117{
118	ndptr p;
119
120	if (strncmp(defn, BUILTIN_MARKER, sizeof(BUILTIN_MARKER)-1) == 0 &&
121	    (p = macro_getbuiltin(defn+sizeof(BUILTIN_MARKER)-1)) != NULL) {
122		d->type = macro_builtin_type(p);
123		d->defn = xstrdup(defn+sizeof(BUILTIN_MARKER)-1);
124	} else {
125		if (!*defn)
126			d->defn = __DECONST(char *, null);
127		else
128			d->defn = xstrdup(defn);
129		d->type = MACRTYPE;
130	}
131	if (STREQ(name, defn))
132		d->type |= RECDEF;
133}
134
135static ndptr
136create_entry(const char *name)
137{
138	const char *end = NULL;
139	unsigned int i;
140	ndptr n;
141
142	i = ohash_qlookupi(&macros, name, &end);
143	n = ohash_find(&macros, i);
144	if (n == NULL) {
145		n = ohash_create_entry(&macro_info, name, &end);
146		ohash_insert(&macros, i, n);
147		n->trace_flags = FLAG_NO_TRACE;
148		n->builtin_type = MACRTYPE;
149		n->d = NULL;
150	}
151	return n;
152}
153
154void
155macro_define(const char *name, const char *defn)
156{
157	ndptr n = create_entry(name);
158	if (n->d != NULL) {
159		if (n->d->defn != null)
160			free(n->d->defn);
161	} else {
162		n->d = xalloc(sizeof(struct macro_definition), NULL);
163		n->d->next = NULL;
164	}
165	setup_definition(n->d, defn, name);
166}
167
168void
169macro_pushdef(const char *name, const char *defn)
170{
171	ndptr n;
172	struct macro_definition *d;
173
174	n = create_entry(name);
175	d = xalloc(sizeof(struct macro_definition), NULL);
176	d->next = n->d;
177	n->d = d;
178	setup_definition(n->d, defn, name);
179}
180
181void
182macro_undefine(const char *name)
183{
184	ndptr n = lookup(name);
185	if (n != NULL) {
186		struct macro_definition *r, *r2;
187
188		for (r = n->d; r != NULL; r = r2) {
189			r2 = r->next;
190			if (r->defn != null)
191				free(r->defn);
192			free(r);
193		}
194		n->d = NULL;
195	}
196}
197
198void
199macro_popdef(const char *name)
200{
201	ndptr n = lookup(name);
202
203	if (n != NULL) {
204		struct macro_definition *r = n->d;
205		if (r != NULL) {
206			n->d = r->next;
207			if (r->defn != null)
208				free(r->defn);
209			free(r);
210		}
211	}
212}
213
214void
215macro_for_all(void (*f)(const char *, struct macro_definition *))
216{
217	ndptr n;
218	unsigned int i;
219
220	for (n = ohash_first(&macros, &i); n != NULL;
221	    n = ohash_next(&macros, &i))
222		if (n->d != NULL)
223			f(n->name, n->d);
224}
225
226void
227setup_builtin(const char *name, unsigned int type)
228{
229	ndptr n;
230	char *name2;
231
232	if (prefix_builtins) {
233		name2 = xalloc(strlen(name)+3+1, NULL);
234		memcpy(name2, "m4_", 3);
235		memcpy(name2 + 3, name, strlen(name)+1);
236	} else
237		name2 = xstrdup(name);
238
239	n = create_entry(name2);
240	n->builtin_type = type;
241	n->d = xalloc(sizeof(struct macro_definition), NULL);
242	n->d->defn = name2;
243	n->d->type = type;
244	n->d->next = NULL;
245}
246
247void
248mark_traced(const char *name, int on)
249{
250	ndptr p;
251	unsigned int i;
252
253	if (name == NULL) {
254		if (on)
255			trace_flags |= TRACE_ALL;
256		else
257			trace_flags &= ~TRACE_ALL;
258		for (p = ohash_first(&macros, &i); p != NULL;
259		    p = ohash_next(&macros, &i))
260			p->trace_flags = FLAG_NO_TRACE;
261	} else {
262		p = create_entry(name);
263		p->trace_flags = on;
264	}
265}
266
267ndptr
268macro_getbuiltin(const char *name)
269{
270	ndptr p;
271
272	p = lookup(name);
273	if (p == NULL || p->builtin_type == MACRTYPE)
274		return NULL;
275	else
276		return p;
277}
278