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char_array.c
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char_array.c
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// Copyright 2018 Open Source Robotics Foundation, Inc.
//
// 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
//
// http://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 <stdarg.h>
#include "rcutils/error_handling.h"
#include "rcutils/types/char_array.h"
#define MIN(a, b) ((a) < (b) ? (a) : (b))
rcutils_char_array_t
rcutils_get_zero_initialized_char_array(void)
{
static rcutils_char_array_t char_array = {
.buffer = NULL,
.owns_buffer = true,
.buffer_length = 0u,
.buffer_capacity = 0u
};
char_array.allocator = rcutils_get_zero_initialized_allocator();
return char_array;
}
rcutils_ret_t
rcutils_char_array_init(
rcutils_char_array_t * char_array,
size_t buffer_capacity,
const rcutils_allocator_t * allocator)
{
RCUTILS_CHECK_ARGUMENT_FOR_NULL(char_array, RCUTILS_RET_ERROR);
RCUTILS_CHECK_ALLOCATOR_WITH_MSG(
allocator, "char array has no valid allocator",
return RCUTILS_RET_ERROR);
char_array->owns_buffer = true;
char_array->buffer_length = 0lu;
char_array->buffer_capacity = buffer_capacity;
char_array->allocator = *allocator;
if (buffer_capacity > 0lu) {
char_array->buffer =
(char *)allocator->allocate(buffer_capacity * sizeof(char), allocator->state);
RCUTILS_CHECK_FOR_NULL_WITH_MSG(
char_array->buffer,
"failed to allocate memory for char array",
char_array->buffer_capacity = 0lu;
char_array->buffer_length = 0lu;
return RCUTILS_RET_BAD_ALLOC);
}
return RCUTILS_RET_OK;
}
rcutils_ret_t
rcutils_char_array_fini(rcutils_char_array_t * char_array)
{
RCUTILS_CHECK_ARGUMENT_FOR_NULL(char_array, RCUTILS_RET_ERROR);
if (char_array->owns_buffer) {
rcutils_allocator_t * allocator = &char_array->allocator;
RCUTILS_CHECK_ALLOCATOR_WITH_MSG(
allocator, "char array has no valid allocator",
return RCUTILS_RET_ERROR);
allocator->deallocate(char_array->buffer, allocator->state);
}
char_array->buffer = NULL;
char_array->buffer_length = 0lu;
char_array->buffer_capacity = 0lu;
return RCUTILS_RET_OK;
}
rcutils_ret_t
rcutils_char_array_resize(rcutils_char_array_t * char_array, size_t new_size)
{
RCUTILS_CHECK_ARGUMENT_FOR_NULL(char_array, RCUTILS_RET_ERROR);
if (0lu == new_size) {
RCUTILS_SET_ERROR_MSG("new size of char_array has to be greater than zero");
return RCUTILS_RET_INVALID_ARGUMENT;
}
rcutils_allocator_t * allocator = &char_array->allocator;
RCUTILS_CHECK_ALLOCATOR_WITH_MSG(
allocator, "char array has no valid allocator",
return RCUTILS_RET_ERROR);
if (new_size == char_array->buffer_capacity) {
// nothing to do here
return RCUTILS_RET_OK;
}
char * old_buf = char_array->buffer;
size_t old_size = char_array->buffer_capacity;
size_t old_length = char_array->buffer_length;
if (char_array->owns_buffer) { // we own the buffer, we can do whatever we want
char_array->buffer = rcutils_reallocf(char_array->buffer, new_size * sizeof(char), allocator);
RCUTILS_CHECK_FOR_NULL_WITH_MSG(
char_array->buffer,
"failed to reallocate memory for char array",
return RCUTILS_RET_BAD_ALLOC);
} else { // we don't realloc memory we don't own. instead, we alloc some new space
rcutils_ret_t ret = rcutils_char_array_init(char_array, new_size, allocator);
if (ret != RCUTILS_RET_OK) {
return ret;
}
size_t n = MIN(new_size, old_size);
memcpy(char_array->buffer, old_buf, n);
char_array->buffer[n - 1] = '\0'; // always have an ending
}
char_array->buffer_capacity = new_size;
char_array->buffer_length = MIN(new_size, old_length);
return RCUTILS_RET_OK;
}
rcutils_ret_t
rcutils_char_array_expand_as_needed(rcutils_char_array_t * char_array, size_t new_size)
{
RCUTILS_CHECK_ARGUMENT_FOR_NULL(char_array, RCUTILS_RET_ERROR);
if (new_size <= char_array->buffer_capacity) {
return RCUTILS_RET_OK;
}
return rcutils_char_array_resize(char_array, new_size);
}
static int
_rcutils_char_array_vsprintf(rcutils_char_array_t * char_array, const char * format, va_list args)
{
va_list args_clone;
va_copy(args_clone, args);
// when doing size calculation, remember the return value of vsnprintf excludes terminating null
// byte
int size = vsnprintf(char_array->buffer, char_array->buffer_capacity, format, args_clone);
va_end(args_clone);
return size;
}
rcutils_ret_t
rcutils_char_array_vsprintf(rcutils_char_array_t * char_array, const char * format, va_list args)
{
int size = _rcutils_char_array_vsprintf(char_array, format, args);
if (size < 0) {
RCUTILS_SET_ERROR_MSG("vsprintf on char array failed");
return RCUTILS_RET_ERROR;
}
size_t new_size = (size_t) size + 1; // with the terminating null byte
if (new_size > char_array->buffer_capacity) {
rcutils_ret_t ret = rcutils_char_array_expand_as_needed(char_array, new_size);
if (ret != RCUTILS_RET_OK) {
RCUTILS_SET_ERROR_MSG("char array failed to expand");
return ret;
}
if (_rcutils_char_array_vsprintf(char_array, format, args) != size) {
if (rcutils_char_array_fini(char_array) == RCUTILS_RET_OK) {
RCUTILS_SET_ERROR_MSG("vsprintf on resized char array failed");
} else {
RCUTILS_SET_ERROR_MSG("vsprintf on resized char array failed; clean up failed too");
}
return RCUTILS_RET_ERROR;
}
}
char_array->buffer_length = new_size;
return RCUTILS_RET_OK;
}
rcutils_ret_t
rcutils_char_array_memcpy(rcutils_char_array_t * char_array, const char * src, size_t n)
{
rcutils_ret_t ret = rcutils_char_array_expand_as_needed(char_array, n);
if (ret != RCUTILS_RET_OK) {
RCUTILS_SET_ERROR_MSG("char array failed to expand");
return ret;
}
memcpy(char_array->buffer, src, n);
char_array->buffer_length = n;
return RCUTILS_RET_OK;
}
rcutils_ret_t
rcutils_char_array_strcpy(rcutils_char_array_t * char_array, const char * src)
{
return rcutils_char_array_memcpy(char_array, src, strlen(src) + 1);
}
rcutils_ret_t
rcutils_char_array_strncat(rcutils_char_array_t * char_array, const char * src, size_t n)
{
size_t current_strlen = strlen(char_array->buffer);
size_t new_length = current_strlen + n + 1;
rcutils_ret_t ret = rcutils_char_array_expand_as_needed(char_array, new_length);
if (ret != RCUTILS_RET_OK) {
RCUTILS_SET_ERROR_MSG("char array failed to expand");
return ret;
}
#ifndef _WIN32
strncat(char_array->buffer, src, n);
#else
errno_t err = strncat_s(char_array->buffer, new_length, src, n);
if (0 != err) {
RCUTILS_SET_ERROR_MSG("strncat_s failed");
return RCUTILS_RET_ERROR;
}
#endif
char_array->buffer_length = new_length;
return RCUTILS_RET_OK;
}
rcutils_ret_t
rcutils_char_array_strcat(rcutils_char_array_t * char_array, const char * src)
{
return rcutils_char_array_strncat(char_array, src, strlen(src));
}