freebsd-dev/usr.bin/m4/look.c
Baptiste Daroussin 31129d4f23 Synchronize with OpenBSD
Obtained from:	OpenBSD
2015-05-18 22:40:12 +00:00

340 lines
7.2 KiB
C

/* $OpenBSD: look.c,v 1.24 2014/12/21 09:33:12 espie Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ozan Yigit at York University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* look.c
* Facility: m4 macro processor
* by: oz
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <ohash.h>
#include "mdef.h"
#include "stdd.h"
#include "extern.h"
static void *hash_calloc(size_t, size_t, void *);
static void hash_free(void *, void *);
static void *element_alloc(size_t, void *);
static void setup_definition(struct macro_definition *, const char *,
const char *);
static void free_definition(char *);
static void keep(char *);
static int string_in_use(const char *);
static struct ohash_info macro_info = {
offsetof(struct ndblock, name),
NULL, hash_calloc, hash_free, element_alloc };
struct ohash macros;
/* Support routines for hash tables. */
void *
hash_calloc(size_t n, size_t s, void *u __unused)
{
void *storage = xcalloc(n, s, "hash alloc");
return storage;
}
void
hash_free(void *p, void *u __unused)
{
free(p);
}
void *
element_alloc(size_t s, void *u __unused)
{
return xalloc(s, "element alloc");
}
void
init_macros(void)
{
ohash_init(&macros, 10, &macro_info);
}
/*
* find name in the hash table
*/
ndptr
lookup(const char *name)
{
return ohash_find(&macros, ohash_qlookup(&macros, name));
}
struct macro_definition *
lookup_macro_definition(const char *name)
{
ndptr p;
p = ohash_find(&macros, ohash_qlookup(&macros, name));
if (p)
return p->d;
else
return NULL;
}
static void
setup_definition(struct macro_definition *d, const char *defn, const char *name)
{
ndptr p;
if (strncmp(defn, BUILTIN_MARKER, sizeof(BUILTIN_MARKER)-1) == 0 &&
(p = macro_getbuiltin(defn+sizeof(BUILTIN_MARKER)-1)) != NULL) {
d->type = macro_builtin_type(p);
d->defn = xstrdup(defn+sizeof(BUILTIN_MARKER)-1);
} else {
if (!*defn)
d->defn = __DECONST(char *, null);
else
d->defn = xstrdup(defn);
d->type = MACRTYPE;
}
if (STREQ(name, defn))
d->type |= RECDEF;
}
static ndptr
create_entry(const char *name)
{
const char *end = NULL;
unsigned int i;
ndptr n;
i = ohash_qlookupi(&macros, name, &end);
n = ohash_find(&macros, i);
if (n == NULL) {
n = ohash_create_entry(&macro_info, name, &end);
ohash_insert(&macros, i, n);
n->trace_flags = FLAG_NO_TRACE;
n->builtin_type = MACRTYPE;
n->d = NULL;
}
return n;
}
void
macro_define(const char *name, const char *defn)
{
ndptr n = create_entry(name);
if (n->d != NULL) {
if (n->d->defn != null)
free_definition(n->d->defn);
} else {
n->d = xalloc(sizeof(struct macro_definition), NULL);
n->d->next = NULL;
}
setup_definition(n->d, defn, name);
}
void
macro_pushdef(const char *name, const char *defn)
{
ndptr n;
struct macro_definition *d;
n = create_entry(name);
d = xalloc(sizeof(struct macro_definition), NULL);
d->next = n->d;
n->d = d;
setup_definition(n->d, defn, name);
}
void
macro_undefine(const char *name)
{
ndptr n = lookup(name);
if (n != NULL) {
struct macro_definition *r, *r2;
for (r = n->d; r != NULL; r = r2) {
r2 = r->next;
if (r->defn != null)
free(r->defn);
free(r);
}
n->d = NULL;
}
}
void
macro_popdef(const char *name)
{
ndptr n = lookup(name);
if (n != NULL) {
struct macro_definition *r = n->d;
if (r != NULL) {
n->d = r->next;
if (r->defn != null)
free(r->defn);
free(r);
}
}
}
void
macro_for_all(void (*f)(const char *, struct macro_definition *))
{
ndptr n;
unsigned int i;
for (n = ohash_first(&macros, &i); n != NULL;
n = ohash_next(&macros, &i))
if (n->d != NULL)
f(n->name, n->d);
}
void
setup_builtin(const char *name, unsigned int type)
{
ndptr n;
char *name2;
if (prefix_builtins) {
name2 = xalloc(strlen(name)+3+1, NULL);
memcpy(name2, "m4_", 3);
memcpy(name2 + 3, name, strlen(name)+1);
} else
name2 = xstrdup(name);
n = create_entry(name2);
n->builtin_type = type;
n->d = xalloc(sizeof(struct macro_definition), NULL);
n->d->defn = name2;
n->d->type = type;
n->d->next = NULL;
}
void
mark_traced(const char *name, int on)
{
ndptr p;
unsigned int i;
if (name == NULL) {
if (on)
trace_flags |= TRACE_ALL;
else
trace_flags &= ~TRACE_ALL;
for (p = ohash_first(&macros, &i); p != NULL;
p = ohash_next(&macros, &i))
p->trace_flags = FLAG_NO_TRACE;
} else {
p = create_entry(name);
p->trace_flags = on;
}
}
ndptr
macro_getbuiltin(const char *name)
{
ndptr p;
p = lookup(name);
if (p == NULL || p->builtin_type == MACRTYPE)
return NULL;
else
return p;
}
/* XXX things are slightly more complicated than they seem.
* a macro may actually be "live" (in the middle of an expansion
* on the stack.
* So we actually may need to place it in an array for later...
*/
static int kept_capacity = 0;
static int kept_size = 0;
static char **kept = NULL;
static void
keep(char *ptr)
{
if (kept_capacity <= kept_size) {
if (kept_capacity)
kept_capacity *= 2;
else
kept_capacity = 50;
kept = xreallocarray(kept, kept_capacity,
sizeof(char *), "Out of memory while saving %d strings\n",
kept_capacity);
}
kept[kept_size++] = ptr;
}
static int
string_in_use(const char *ptr)
{
int i;
for (i = 0; i <= sp; i++) {
if (sstack[i] == STORAGE_MACRO && mstack[i].sstr == ptr)
return 1;
}
return 0;
}
static void
free_definition(char *ptr)
{
int i;
/* first try to free old strings */
for (i = 0; i < kept_size; i++) {
if (!string_in_use(kept[i])) {
kept_size--;
free(kept[i]);
if (i != kept_size)
kept[i] = kept[kept_size];
i--;
}
}
/* then deal with us */
if (string_in_use(ptr))
keep(ptr);
else
free(ptr);
}