look.c revision 269162 
1/*	$OpenBSD: look.c,v 1.23 2014/05/12 19:11:19 espie 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: head/usr.bin/m4/look.c 269162 2014-07-27 22:54:13Z bapt $");
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_calloc(size_t, size_t, void *);
55static void hash_free(void *, 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_calloc, hash_free, element_alloc };
63
64struct ohash macros;
65
66/* Support routines for hash tables.  */
67void *
68hash_calloc(size_t n, size_t s, void *u __unused)
69{
70	void *storage = xcalloc(n, s, "hash alloc");
71	return storage;
72}
73
74void
75hash_free(void *p, void *u __unused)
76{
77	free(p);
78}
79
80void *
81element_alloc(size_t s, void *u __unused)
82{
83	return xalloc(s, "element alloc");
84}
85
86void
87init_macros(void)
88{
89	ohash_init(&macros, 10, &macro_info);
90}
91
92/*
93 * find name in the hash table
94 */
95ndptr
96lookup(const char *name)
97{
98	return ohash_find(&macros, ohash_qlookup(&macros, name));
99}
100
101struct macro_definition *
102lookup_macro_definition(const char *name)
103{
104	ndptr p;
105
106	p = ohash_find(&macros, ohash_qlookup(&macros, name));
107	if (p)
108		return p->d;
109	else
110		return NULL;
111}
112
113static void
114setup_definition(struct macro_definition *d, const char *defn, const char *name)
115{
116	ndptr p;
117
118	if (strncmp(defn, BUILTIN_MARKER, sizeof(BUILTIN_MARKER)-1) == 0 &&
119	    (p = macro_getbuiltin(defn+sizeof(BUILTIN_MARKER)-1)) != NULL) {
120		d->type = macro_builtin_type(p);
121		d->defn = xstrdup(defn+sizeof(BUILTIN_MARKER)-1);
122	} else {
123		if (!*defn)
124			d->defn = __DECONST(char *, null);
125		else
126			d->defn = xstrdup(defn);
127		d->type = MACRTYPE;
128	}
129	if (STREQ(name, defn))
130		d->type |= RECDEF;
131}
132
133static ndptr
134create_entry(const char *name)
135{
136	const char *end = NULL;
137	unsigned int i;
138	ndptr n;
139
140	i = ohash_qlookupi(&macros, name, &end);
141	n = ohash_find(&macros, i);
142	if (n == NULL) {
143		n = ohash_create_entry(&macro_info, name, &end);
144		ohash_insert(&macros, i, n);
145		n->trace_flags = FLAG_NO_TRACE;
146		n->builtin_type = MACRTYPE;
147		n->d = NULL;
148	}
149	return n;
150}
151
152void
153macro_define(const char *name, const char *defn)
154{
155	ndptr n = create_entry(name);
156	if (n->d != NULL) {
157		if (n->d->defn != null)
158			free(n->d->defn);
159	} else {
160		n->d = xalloc(sizeof(struct macro_definition), NULL);
161		n->d->next = NULL;
162	}
163	setup_definition(n->d, defn, name);
164}
165
166void
167macro_pushdef(const char *name, const char *defn)
168{
169	ndptr n;
170	struct macro_definition *d;
171
172	n = create_entry(name);
173	d = xalloc(sizeof(struct macro_definition), NULL);
174	d->next = n->d;
175	n->d = d;
176	setup_definition(n->d, defn, name);
177}
178
179void
180macro_undefine(const char *name)
181{
182	ndptr n = lookup(name);
183	if (n != NULL) {
184		struct macro_definition *r, *r2;
185
186		for (r = n->d; r != NULL; r = r2) {
187			r2 = r->next;
188			if (r->defn != null)
189				free(r->defn);
190			free(r);
191		}
192		n->d = NULL;
193	}
194}
195
196void
197macro_popdef(const char *name)
198{
199	ndptr n = lookup(name);
200
201	if (n != NULL) {
202		struct macro_definition *r = n->d;
203		if (r != NULL) {
204			n->d = r->next;
205			if (r->defn != null)
206				free(r->defn);
207			free(r);
208		}
209	}
210}
211
212void
213macro_for_all(void (*f)(const char *, struct macro_definition *))
214{
215	ndptr n;
216	unsigned int i;
217
218	for (n = ohash_first(&macros, &i); n != NULL;
219	    n = ohash_next(&macros, &i))
220		if (n->d != NULL)
221			f(n->name, n->d);
222}
223
224void
225setup_builtin(const char *name, unsigned int type)
226{
227	ndptr n;
228	char *name2;
229
230	if (prefix_builtins) {
231		name2 = xalloc(strlen(name)+3+1, NULL);
232		memcpy(name2, "m4_", 3);
233		memcpy(name2 + 3, name, strlen(name)+1);
234	} else
235		name2 = xstrdup(name);
236
237	n = create_entry(name2);
238	n->builtin_type = type;
239	n->d = xalloc(sizeof(struct macro_definition), NULL);
240	n->d->defn = name2;
241	n->d->type = type;
242	n->d->next = NULL;
243}
244
245void
246mark_traced(const char *name, int on)
247{
248	ndptr p;
249	unsigned int i;
250
251	if (name == NULL) {
252		if (on)
253			trace_flags |= TRACE_ALL;
254		else
255			trace_flags &= ~TRACE_ALL;
256		for (p = ohash_first(&macros, &i); p != NULL;
257		    p = ohash_next(&macros, &i))
258			p->trace_flags = FLAG_NO_TRACE;
259	} else {
260		p = create_entry(name);
261		p->trace_flags = on;
262	}
263}
264
265ndptr
266macro_getbuiltin(const char *name)
267{
268	ndptr p;
269
270	p = lookup(name);
271	if (p == NULL || p->builtin_type == MACRTYPE)
272		return NULL;
273	else
274		return p;
275}
276