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/**
* Copyright 2019-2020 DigitalOcean 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 <stddef.h>
// Public
#include "prom_alloc.h"
// Private
#include "prom_assert.h"
#include "prom_string_builder_i.h"
#include "prom_string_builder_t.h"
// The initial size of a string created via prom_string_builder
#define PROM_STRING_BUILDER_INIT_SIZE 32
// prom_string_builder_init prototype declaration
int prom_string_builder_init(prom_string_builder_t *self);
struct prom_string_builder {
char *str; /**< the target string */
size_t allocated; /**< the size allocated to the string in bytes */
size_t len; /**< the length of str */
size_t init_size; /**< the initialize size of space to allocate */
};
prom_string_builder_t *prom_string_builder_new(void) {
int r = 0;
prom_string_builder_t *self = (prom_string_builder_t *)prom_malloc(sizeof(prom_string_builder_t));
self->init_size = PROM_STRING_BUILDER_INIT_SIZE;
r = prom_string_builder_init(self);
if (r) {
prom_string_builder_destroy(self);
return NULL;
}
return self;
}
int prom_string_builder_init(prom_string_builder_t *self) {
PROM_ASSERT(self != NULL);
if (self == NULL) return 1;
self->str = (char *)prom_malloc(self->init_size);
*self->str = '\0';
self->allocated = self->init_size;
self->len = 0;
return 0;
}
int prom_string_builder_destroy(prom_string_builder_t *self) {
PROM_ASSERT(self != NULL);
if (self == NULL) return 0;
prom_free(self->str);
self->str = NULL;
prom_free(self);
self = NULL;
return 0;
}
/**
* @brief API PRIVATE Grows the size of the string given the value we want to add
*
* The method continuously shifts left until the new size is large enough to accommodate add_len. This private method
* is called in methods that need to add one or more characters to the underlying string.
*/
static int prom_string_builder_ensure_space(prom_string_builder_t *self, size_t add_len) {
PROM_ASSERT(self != NULL);
if (self == NULL) return 1;
if (add_len == 0 || self->allocated >= self->len + add_len + 1) return 0;
while (self->allocated < self->len + add_len + 1) self->allocated <<= 1;
self->str = (char *)prom_realloc(self->str, self->allocated);
return 0;
}
int prom_string_builder_add_str(prom_string_builder_t *self, const char *str) {
PROM_ASSERT(self != NULL);
int r = 0;
if (self == NULL) return 1;
if (str == NULL || *str == '\0') return 0;
size_t len = strlen(str);
r = prom_string_builder_ensure_space(self, len);
if (r) return r;
memcpy(self->str + self->len, str, len);
self->len += len;
self->str[self->len] = '\0';
return 0;
}
int prom_string_builder_add_char(prom_string_builder_t *self, char c) {
PROM_ASSERT(self != NULL);
int r = 0;
if (self == NULL) return 1;
r = prom_string_builder_ensure_space(self, 1);
if (r) return r;
self->str[self->len] = c;
self->len++;
self->str[self->len] = '\0';
return 0;
}
int prom_string_builder_truncate(prom_string_builder_t *self, size_t len) {
PROM_ASSERT(self != NULL);
if (self == NULL) return 1;
if (len >= self->len) return 0;
self->len = len;
self->str[self->len] = '\0';
return 0;
}
int prom_string_builder_clear(prom_string_builder_t *self) {
PROM_ASSERT(self != NULL);
prom_free(self->str);
self->str = NULL;
return prom_string_builder_init(self);
}
size_t prom_string_builder_len(prom_string_builder_t *self) {
PROM_ASSERT(self != NULL);
return self->len;
}
char *prom_string_builder_dump(prom_string_builder_t *self) {
PROM_ASSERT(self != NULL);
// +1 to accommodate \0
char *out = (char *)prom_malloc((self->len + 1) * sizeof(char));
memcpy(out, self->str, self->len + 1);
return out;
}
char *prom_string_builder_str(prom_string_builder_t *self) {
PROM_ASSERT(self != NULL);
return self->str;
}
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