xbps/lib/portableproplib/prop_string.c
2014-05-17 20:25:14 +02:00

470 lines
11 KiB
C

/* $NetBSD: prop_string.c,v 1.12 2014/03/26 18:12:46 christos Exp $ */
/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <prop/prop_string.h>
#include "prop_object_impl.h"
struct _prop_string {
struct _prop_object ps_obj;
union {
char * psu_mutable;
const char * psu_immutable;
} ps_un;
#define ps_mutable ps_un.psu_mutable
#define ps_immutable ps_un.psu_immutable
size_t ps_size; /* not including \0 */
int ps_flags;
};
#define PS_F_NOCOPY 0x01
_PROP_POOL_INIT(_prop_string_pool, sizeof(struct _prop_string), "propstng")
static _prop_object_free_rv_t
_prop_string_free(prop_stack_t, prop_object_t *);
static bool _prop_string_externalize(
struct _prop_object_externalize_context *,
void *);
static _prop_object_equals_rv_t
_prop_string_equals(prop_object_t, prop_object_t,
void **, void **,
prop_object_t *, prop_object_t *);
static const struct _prop_object_type _prop_object_type_string = {
.pot_type = PROP_TYPE_STRING,
.pot_free = _prop_string_free,
.pot_extern = _prop_string_externalize,
.pot_equals = _prop_string_equals,
};
#define prop_object_is_string(x) \
((x) != NULL && (x)->ps_obj.po_type == &_prop_object_type_string)
#define prop_string_contents(x) ((x)->ps_immutable ? (x)->ps_immutable : "")
/* ARGSUSED */
static _prop_object_free_rv_t
_prop_string_free(prop_stack_t stack, prop_object_t *obj)
{
prop_string_t ps = *obj;
if ((ps->ps_flags & PS_F_NOCOPY) == 0 && ps->ps_mutable != NULL)
_PROP_FREE(ps->ps_mutable, M_PROP_STRING);
_PROP_POOL_PUT(_prop_string_pool, ps);
return (_PROP_OBJECT_FREE_DONE);
}
static bool
_prop_string_externalize(struct _prop_object_externalize_context *ctx,
void *v)
{
prop_string_t ps = v;
if (ps->ps_size == 0)
return (_prop_object_externalize_empty_tag(ctx, "string"));
if (_prop_object_externalize_start_tag(ctx, "string") == false ||
_prop_object_externalize_append_encoded_cstring(ctx,
ps->ps_immutable) == false ||
_prop_object_externalize_end_tag(ctx, "string") == false)
return (false);
return (true);
}
/* ARGSUSED */
static _prop_object_equals_rv_t
_prop_string_equals(prop_object_t v1, prop_object_t v2,
void **stored_pointer1, void **stored_pointer2,
prop_object_t *next_obj1, prop_object_t *next_obj2)
{
prop_string_t str1 = v1;
prop_string_t str2 = v2;
if (str1 == str2)
return (_PROP_OBJECT_EQUALS_TRUE);
if (str1->ps_size != str2->ps_size)
return (_PROP_OBJECT_EQUALS_FALSE);
if (strcmp(prop_string_contents(str1), prop_string_contents(str2)))
return (_PROP_OBJECT_EQUALS_FALSE);
else
return (_PROP_OBJECT_EQUALS_TRUE);
}
static prop_string_t
_prop_string_alloc(void)
{
prop_string_t ps;
ps = _PROP_POOL_GET(_prop_string_pool);
if (ps != NULL) {
_prop_object_init(&ps->ps_obj, &_prop_object_type_string);
ps->ps_mutable = NULL;
ps->ps_size = 0;
ps->ps_flags = 0;
}
return (ps);
}
/*
* prop_string_create --
* Create an empty mutable string.
*/
prop_string_t
prop_string_create(void)
{
return (_prop_string_alloc());
}
/*
* prop_string_create_cstring --
* Create a string that contains a copy of the provided C string.
*/
prop_string_t
prop_string_create_cstring(const char *str)
{
prop_string_t ps;
char *cp;
size_t len;
ps = _prop_string_alloc();
if (ps != NULL) {
len = strlen(str);
cp = _PROP_MALLOC(len + 1, M_PROP_STRING);
if (cp == NULL) {
prop_object_release(ps);
return (NULL);
}
strcpy(cp, str);
ps->ps_mutable = cp;
ps->ps_size = len;
}
return (ps);
}
/*
* prop_string_create_cstring_nocopy --
* Create an immutable string that contains a refrence to the
* provided C string.
*/
prop_string_t
prop_string_create_cstring_nocopy(const char *str)
{
prop_string_t ps;
ps = _prop_string_alloc();
if (ps != NULL) {
ps->ps_immutable = str;
ps->ps_size = strlen(str);
ps->ps_flags |= PS_F_NOCOPY;
}
return (ps);
}
/*
* prop_string_copy --
* Copy a string. If the original string is immutable, then the
* copy is also immutable and references the same external data.
*/
prop_string_t
prop_string_copy(prop_string_t ops)
{
prop_string_t ps;
if (! prop_object_is_string(ops))
return (NULL);
ps = _prop_string_alloc();
if (ps != NULL) {
ps->ps_size = ops->ps_size;
ps->ps_flags = ops->ps_flags;
if (ops->ps_flags & PS_F_NOCOPY)
ps->ps_immutable = ops->ps_immutable;
else {
char *cp = _PROP_MALLOC(ps->ps_size + 1, M_PROP_STRING);
if (cp == NULL) {
prop_object_release(ps);
return (NULL);
}
strcpy(cp, prop_string_contents(ops));
ps->ps_mutable = cp;
}
}
return (ps);
}
/*
* prop_string_copy_mutable --
* Copy a string, always returning a mutable copy.
*/
prop_string_t
prop_string_copy_mutable(prop_string_t ops)
{
prop_string_t ps;
char *cp;
if (! prop_object_is_string(ops))
return (NULL);
ps = _prop_string_alloc();
if (ps != NULL) {
ps->ps_size = ops->ps_size;
cp = _PROP_MALLOC(ps->ps_size + 1, M_PROP_STRING);
if (cp == NULL) {
prop_object_release(ps);
return (NULL);
}
strcpy(cp, prop_string_contents(ops));
ps->ps_mutable = cp;
}
return (ps);
}
/*
* prop_string_size --
* Return the size of the string, not including the terminating NUL.
*/
size_t
prop_string_size(prop_string_t ps)
{
if (! prop_object_is_string(ps))
return (0);
return (ps->ps_size);
}
/*
* prop_string_mutable --
* Return true if the string is a mutable string.
*/
bool
prop_string_mutable(prop_string_t ps)
{
if (! prop_object_is_string(ps))
return (false);
return ((ps->ps_flags & PS_F_NOCOPY) == 0);
}
/*
* prop_string_cstring --
* Return a copy of the contents of the string as a C string.
* The string is allocated with the M_TEMP malloc type.
*/
char *
prop_string_cstring(prop_string_t ps)
{
char *cp;
if (! prop_object_is_string(ps))
return (NULL);
cp = _PROP_MALLOC(ps->ps_size + 1, M_TEMP);
if (cp != NULL)
strcpy(cp, prop_string_contents(ps));
return (cp);
}
/*
* prop_string_cstring_nocopy --
* Return an immutable reference to the contents of the string
* as a C string.
*/
const char *
prop_string_cstring_nocopy(prop_string_t ps)
{
if (! prop_object_is_string(ps))
return (NULL);
return (prop_string_contents(ps));
}
/*
* prop_string_append --
* Append the contents of one string to another. Returns true
* upon success. The destination string must be mutable.
*/
bool
prop_string_append(prop_string_t dst, prop_string_t src)
{
char *ocp, *cp;
size_t len;
if (! (prop_object_is_string(dst) &&
prop_object_is_string(src)))
return (false);
if (dst->ps_flags & PS_F_NOCOPY)
return (false);
len = dst->ps_size + src->ps_size;
cp = _PROP_MALLOC(len + 1, M_PROP_STRING);
if (cp == NULL)
return (false);
snprintf(cp, len + 1, "%s%s", prop_string_contents(dst),
prop_string_contents(src));
ocp = dst->ps_mutable;
dst->ps_mutable = cp;
dst->ps_size = len;
if (ocp != NULL)
_PROP_FREE(ocp, M_PROP_STRING);
return (true);
}
/*
* prop_string_append_cstring --
* Append a C string to a string. Returns true upon success.
* The destination string must be mutable.
*/
bool
prop_string_append_cstring(prop_string_t dst, const char *src)
{
char *ocp, *cp;
size_t len;
if (! prop_object_is_string(dst))
return (false);
_PROP_ASSERT(src != NULL);
if (dst->ps_flags & PS_F_NOCOPY)
return (false);
len = dst->ps_size + strlen(src);
cp = _PROP_MALLOC(len + 1, M_PROP_STRING);
if (cp == NULL)
return (false);
snprintf(cp, len + 1, "%s%s", prop_string_contents(dst), src);
ocp = dst->ps_mutable;
dst->ps_mutable = cp;
dst->ps_size = len;
if (ocp != NULL)
_PROP_FREE(ocp, M_PROP_STRING);
return (true);
}
/*
* prop_string_equals --
* Return true if two strings are equivalent.
*/
bool
prop_string_equals(prop_string_t str1, prop_string_t str2)
{
if (!prop_object_is_string(str1) || !prop_object_is_string(str2))
return (false);
return prop_object_equals(str1, str2);
}
/*
* prop_string_equals_cstring --
* Return true if the string is equivalent to the specified
* C string.
*/
bool
prop_string_equals_cstring(prop_string_t ps, const char *cp)
{
if (! prop_object_is_string(ps))
return (false);
return (strcmp(prop_string_contents(ps), cp) == 0);
}
/*
* _prop_string_internalize --
* Parse a <string>...</string> and return the object created from the
* external representation.
*/
/* ARGSUSED */
bool
_prop_string_internalize(prop_stack_t stack, prop_object_t *obj,
struct _prop_object_internalize_context *ctx)
{
prop_string_t string;
char *str;
size_t len, alen;
if (ctx->poic_is_empty_element) {
*obj = prop_string_create();
return (true);
}
/* No attributes recognized here. */
if (ctx->poic_tagattr != NULL)
return (true);
/* Compute the length of the result. */
if (_prop_object_internalize_decode_string(ctx, NULL, 0, &len,
NULL) == false)
return (true);
str = _PROP_MALLOC(len + 1, M_PROP_STRING);
if (str == NULL)
return (true);
if (_prop_object_internalize_decode_string(ctx, str, len, &alen,
&ctx->poic_cp) == false ||
alen != len) {
_PROP_FREE(str, M_PROP_STRING);
return (true);
}
str[len] = '\0';
if (_prop_object_internalize_find_tag(ctx, "string",
_PROP_TAG_TYPE_END) == false) {
_PROP_FREE(str, M_PROP_STRING);
return (true);
}
string = _prop_string_alloc();
if (string == NULL) {
_PROP_FREE(str, M_PROP_STRING);
return (true);
}
string->ps_mutable = str;
string->ps_size = len;
*obj = string;
return (true);
}