120 lines
2.2 KiB
C
120 lines
2.2 KiB
C
#include "mystring.h"
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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mcl_string *mcl_string_new(const char *text, long initial_capacity) {
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if (!text) {
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return NULL;
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}
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/* Allocate string struct */
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mcl_string *str = malloc(sizeof(mcl_string));
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if (!str) {
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return NULL;
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}
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/* Calculate size and capacity */
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str->size = strlen(text);
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size_t capacity = initial_capacity;
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if (capacity != -1 && capacity - 1 < str->size) {
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return NULL;
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}
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if (capacity == -1) {
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capacity = (unsigned long)pow(2, (unsigned)log2(str->size) + 1);
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}
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str->capacity = capacity;
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/* Allocate data buffer */
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str->data = malloc(sizeof(char) * str->capacity);
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if (!str->data) {
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free(str);
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return NULL;
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}
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/* Copy the text and ensure null termination */
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memset(str->data, 0, str->capacity);
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memcpy(str->data, text, str->size);
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str->data[str->size] = '\0';
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return str;
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}
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int mcl_string_append(mcl_string *string, const char *text) {
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if (!string || !text) {
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return -1;
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}
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/* Handle empty case */
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size_t text_len = strlen(text);
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if (text_len == 0) {
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return 0;
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}
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size_t new_size = text_len + string->size;
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/* Check if we need to resize */
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if (new_size + 1 > string->capacity) {
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size_t new_capacity = (unsigned long)pow(2, (unsigned)log2(new_size) + 1);
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/* Reallocate the buffer */
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void *new_data = realloc(string->data, sizeof(char) * new_capacity);
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if (!new_data) {
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return -1;
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}
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string->data = new_data;
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string->capacity = new_capacity;
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/* Init to 0 the new capacity */
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memset(string->data + string->size, 0, string->capacity - string->size);
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}
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/* Append text */
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memcpy(string->data + string->size, text, text_len);
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string->size = new_size;
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string->data[string->size] = '\0';
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return 0;
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}
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void mcl_string_free(mcl_string *string) {
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if (!string) {
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return;
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}
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if (string->data) {
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free(string->data);
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}
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free(string);
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}
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size_t mcl_string_length(const mcl_string *string) {
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if (!string) {
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return 0;
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}
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return string->size;
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}
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size_t mcl_string_capacity(const mcl_string *string) {
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if (!string) {
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return 0;
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}
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return string->capacity;
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}
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const char *mcl_string_cstr(const mcl_string *string) {
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if (!string || !string->data) {
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return "";
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}
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return string->data;
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}
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