sexpr.c revision 431a83fb29482c5170b3e4026e59bb14849a6707
/*
* Portions Copyright (C) 2004, 2005, 2007, 2014 Internet Systems Consortium, Inc. ("ISC")
* Portions Copyright (C) 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NOMINUM DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Portions Copyright (C) 2001 Nominum, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NOMINUM DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: sexpr.c,v 1.9 2007/08/28 07:20:43 tbox Exp $ */
/*! \file */
#include <config.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <isc/assertions.h>
#include <isccc/sexpr.h>
#include <isccc/util.h>
static isccc_sexpr_t sexpr_t = { ISCCC_SEXPRTYPE_T, { NULL } };
#define CAR(s) (s)->value.as_dottedpair.car
#define CDR(s) (s)->value.as_dottedpair.cdr
isccc_sexpr_t *
isccc_sexpr_cons(isccc_sexpr_t *car, isccc_sexpr_t *cdr)
{
isccc_sexpr_t *sexpr;
sexpr = malloc(sizeof(*sexpr));
if (sexpr == NULL)
return (NULL);
sexpr->type = ISCCC_SEXPRTYPE_DOTTEDPAIR;
CAR(sexpr) = car;
CDR(sexpr) = cdr;
return (sexpr);
}
isccc_sexpr_t *
isccc_sexpr_tconst(void)
{
return (&sexpr_t);
}
isccc_sexpr_t *
isccc_sexpr_fromstring(const char *str)
{
isccc_sexpr_t *sexpr;
sexpr = malloc(sizeof(*sexpr));
if (sexpr == NULL)
return (NULL);
sexpr->type = ISCCC_SEXPRTYPE_STRING;
sexpr->value.as_string = strdup(str);
if (sexpr->value.as_string == NULL) {
free(sexpr);
return (NULL);
}
return (sexpr);
}
isccc_sexpr_t *
isccc_sexpr_frombinary(const isccc_region_t *region)
{
isccc_sexpr_t *sexpr;
unsigned int region_size;
sexpr = malloc(sizeof(*sexpr));
if (sexpr == NULL)
return (NULL);
sexpr->type = ISCCC_SEXPRTYPE_BINARY;
region_size = REGION_SIZE(*region);
/*
* We add an extra byte when we malloc so we can NUL terminate
* the binary data. This allows the caller to use it as a C
* string. It's up to the caller to ensure this is safe. We don't
* add 1 to the length of the binary region, because the NUL is
* not part of the binary data.
*/
sexpr->value.as_region.rstart = malloc(region_size + 1);
if (sexpr->value.as_region.rstart == NULL) {
free(sexpr);
return (NULL);
}
sexpr->value.as_region.rend = sexpr->value.as_region.rstart +
region_size;
memmove(sexpr->value.as_region.rstart, region->rstart, region_size);
/*
* NUL terminate.
*/
sexpr->value.as_region.rstart[region_size] = '\0';
return (sexpr);
}
void
isccc_sexpr_free(isccc_sexpr_t **sexprp)
{
isccc_sexpr_t *sexpr;
isccc_sexpr_t *item;
sexpr = *sexprp;
if (sexpr == NULL)
return;
switch (sexpr->type) {
case ISCCC_SEXPRTYPE_STRING:
free(sexpr->value.as_string);
break;
case ISCCC_SEXPRTYPE_DOTTEDPAIR:
item = CAR(sexpr);
if (item != NULL)
isccc_sexpr_free(&item);
item = CDR(sexpr);
if (item != NULL)
isccc_sexpr_free(&item);
break;
case ISCCC_SEXPRTYPE_BINARY:
free(sexpr->value.as_region.rstart);
break;
}
free(sexpr);
*sexprp = NULL;
}
static isc_boolean_t
printable(isccc_region_t *r)
{
unsigned char *curr;
curr = r->rstart;
while (curr != r->rend) {
if (!isprint(*curr))
return (ISC_FALSE);
curr++;
}
return (ISC_TRUE);
}
void
isccc_sexpr_print(isccc_sexpr_t *sexpr, FILE *stream)
{
isccc_sexpr_t *cdr;
unsigned int size, i;
unsigned char *curr;
if (sexpr == NULL) {
fprintf(stream, "nil");
return;
}
switch (sexpr->type) {
case ISCCC_SEXPRTYPE_T:
fprintf(stream, "t");
break;
case ISCCC_SEXPRTYPE_STRING:
fprintf(stream, "\"%s\"", sexpr->value.as_string);
break;
case ISCCC_SEXPRTYPE_DOTTEDPAIR:
fprintf(stream, "(");
do {
isccc_sexpr_print(CAR(sexpr), stream);
cdr = CDR(sexpr);
if (cdr != NULL) {
fprintf(stream, " ");
if (cdr->type != ISCCC_SEXPRTYPE_DOTTEDPAIR) {
fprintf(stream, ". ");
isccc_sexpr_print(cdr, stream);
cdr = NULL;
}
}
sexpr = cdr;
} while (sexpr != NULL);
fprintf(stream, ")");
break;
case ISCCC_SEXPRTYPE_BINARY:
size = REGION_SIZE(sexpr->value.as_region);
curr = sexpr->value.as_region.rstart;
if (printable(&sexpr->value.as_region)) {
fprintf(stream, "'%.*s'", (int)size, curr);
} else {
fprintf(stream, "0x");
for (i = 0; i < size; i++)
fprintf(stream, "%02x", *curr++);
}
break;
default:
INSIST(0);
}
}
isccc_sexpr_t *
isccc_sexpr_car(isccc_sexpr_t *list)
{
REQUIRE(list->type == ISCCC_SEXPRTYPE_DOTTEDPAIR);
return (CAR(list));
}
isccc_sexpr_t *
isccc_sexpr_cdr(isccc_sexpr_t *list)
{
REQUIRE(list->type == ISCCC_SEXPRTYPE_DOTTEDPAIR);
return (CDR(list));
}
void
isccc_sexpr_setcar(isccc_sexpr_t *pair, isccc_sexpr_t *car)
{
REQUIRE(pair->type == ISCCC_SEXPRTYPE_DOTTEDPAIR);
CAR(pair) = car;
}
void
isccc_sexpr_setcdr(isccc_sexpr_t *pair, isccc_sexpr_t *cdr)
{
REQUIRE(pair->type == ISCCC_SEXPRTYPE_DOTTEDPAIR);
CDR(pair) = cdr;
}
isccc_sexpr_t *
isccc_sexpr_addtolist(isccc_sexpr_t **l1p, isccc_sexpr_t *l2)
{
isccc_sexpr_t *last, *elt, *l1;
REQUIRE(l1p != NULL);
l1 = *l1p;
REQUIRE(l1 == NULL || l1->type == ISCCC_SEXPRTYPE_DOTTEDPAIR);
elt = isccc_sexpr_cons(l2, NULL);
if (elt == NULL)
return (NULL);
if (l1 == NULL) {
*l1p = elt;
return (elt);
}
for (last = l1; CDR(last) != NULL; last = CDR(last))
/* Nothing */;
CDR(last) = elt;
return (elt);
}
isc_boolean_t
isccc_sexpr_listp(isccc_sexpr_t *sexpr)
{
if (sexpr == NULL || sexpr->type == ISCCC_SEXPRTYPE_DOTTEDPAIR)
return (ISC_TRUE);
return (ISC_FALSE);
}
isc_boolean_t
isccc_sexpr_emptyp(isccc_sexpr_t *sexpr)
{
if (sexpr == NULL)
return (ISC_TRUE);
return (ISC_FALSE);
}
isc_boolean_t
isccc_sexpr_stringp(isccc_sexpr_t *sexpr)
{
if (sexpr != NULL && sexpr->type == ISCCC_SEXPRTYPE_STRING)
return (ISC_TRUE);
return (ISC_FALSE);
}
isc_boolean_t
isccc_sexpr_binaryp(isccc_sexpr_t *sexpr)
{
if (sexpr != NULL && sexpr->type == ISCCC_SEXPRTYPE_BINARY)
return (ISC_TRUE);
return (ISC_FALSE);
}
char *
isccc_sexpr_tostring(isccc_sexpr_t *sexpr)
{
REQUIRE(sexpr != NULL &&
(sexpr->type == ISCCC_SEXPRTYPE_STRING ||
sexpr->type == ISCCC_SEXPRTYPE_BINARY));
if (sexpr->type == ISCCC_SEXPRTYPE_BINARY)
return ((char *)sexpr->value.as_region.rstart);
return (sexpr->value.as_string);
}
isccc_region_t *
isccc_sexpr_tobinary(isccc_sexpr_t *sexpr)
{
REQUIRE(sexpr != NULL && sexpr->type == ISCCC_SEXPRTYPE_BINARY);
return (&sexpr->value.as_region);
}