mirror of
https://github.com/nunuhara/xsystem4.git
synced 2026-09-28 18:08:07 +03:00
Nunuhara Cabbage
b3a660f8ec
Only copy strings when they are mutated. This avoids copying strings in cases where neither the copy nor the original would be modified during the lifetime of the copy, e.g. when passing strings by-value. This is purely an optimization.
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* Copyright (C) 2019 Nunuhara Cabbage <nunuhara@haniwa.technology>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef SYSTEM4_STRING_H
|
|
#define SYSTEM4_STRING_H
|
|
|
|
#include <stdbool.h>
|
|
#include <stdlib.h>
|
|
|
|
struct string {
|
|
int size;
|
|
unsigned int ref : 24;
|
|
unsigned int cow : 1;
|
|
char text[];
|
|
};
|
|
|
|
void free_string(struct string *str);
|
|
|
|
// constructors
|
|
struct string *make_string(const char *str, unsigned int len);
|
|
struct string *string_ref(struct string *s);
|
|
struct string *string_dup(const struct string *in);
|
|
struct string *integer_to_string(int n);
|
|
struct string *float_to_string(float f, int precision);
|
|
struct string *string_concatenate(const struct string *a, const struct string *b);
|
|
struct string *string_copy(const struct string *s, int index, int len);
|
|
|
|
// mutators
|
|
void string_append(struct string **a, const struct string *b);
|
|
void string_push_back(struct string **s, int c);
|
|
void string_pop_back(struct string **s);
|
|
void string_erase(struct string **s, int index);
|
|
|
|
// queries
|
|
int string_find(const struct string *haystack, const struct string *needle);
|
|
|
|
#endif
|