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/*
* Copyright 2019 The Hafnium Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "hf/string.h"
#include "hf/static_assert.h"
#include "hf/std.h"
void string_init_empty(struct string *str)
{
static_assert(sizeof(str->data) >= 1, "String buffer too small");
str->data[0] = '\0';
}
/**
* Caller must guarantee that `data` points to a NULL-terminated string.
* The constructor checks that it fits into the internal buffer and copies
* the string there.
*/
enum string_return_code string_init(struct string *str,
const struct memiter *data)
{
const char *base = memiter_base(data);
size_t size = memiter_size(data);
/*
* Require that the value contains exactly one NULL character and that
* it is the last byte.
*/
if (size < 1 || memchr(base, '\0', size) != &base[size - 1]) {
return STRING_ERROR_INVALID_INPUT;
}
if (size > sizeof(str->data)) {
return STRING_ERROR_TOO_LONG;
}
memcpy_s(str->data, sizeof(str->data), base, size);
return STRING_SUCCESS;
}
bool string_is_empty(const struct string *str)
{
return str->data[0] == '\0';
}
const char *string_data(const struct string *str)
{
return str->data;
}
/**
* Returns true if the iterator `data` contains string `str`.
* Only characters until the first null terminator are compared.
*/
bool string_eq(const struct string *str, const struct memiter *data)
{
const char *base = memiter_base(data);
size_t len = memiter_size(data);
return (len <= sizeof(str->data)) &&
(strncmp(str->data, base, len) == 0);
}