xref: /dragonfly/usr.bin/m4/look.c (revision 4da66bbfa353d0fb44e7a3c17f7268748edba48b)

/*        $OpenBSD: look.c,v 1.22 2010/09/07 19:58:09 marco 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.
 *
 * $FreeBSD: src/usr.bin/m4/look.c,v 1.10 2012/11/17 01:54:24 svnexp Exp $
 */

/*
 * 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_alloc(size_t, void *);
static void hash_free(void *, size_t, void *);
static void *element_alloc(size_t, void *);
static void setup_definition(struct macro_definition *, const char *,
                                   const char *);

static struct ohash_info macro_info = {
          offsetof(struct ndblock, name),
          NULL, hash_alloc, hash_free, element_alloc };

struct ohash macros;

/* Support routines for hash tables.  */
void *
hash_alloc(size_t s, __unused void *u)
{
          void *storage = xalloc(s, "hash alloc");
          if (storage)
                    memset(storage, 0, s);
          return storage;
}

void
hash_free(void *p, __unused size_t s, __unused void *u)
{
          free(p);
}

void *
element_alloc(size_t s, __unused void *u)
{
          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(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;
}