#ifndef CMARK_BUFFER_H
#define CMARK_BUFFER_H

#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <stdbool.h>
#include "config.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef ssize_t bufsize_t;

typedef struct {
  unsigned char *ptr;
  bufsize_t asize, size;
} cmark_strbuf;

extern unsigned char cmark_strbuf__initbuf[];

#define GH_BUF_INIT                                                            \
  { cmark_strbuf__initbuf, 0, 0 }

/*
 * Maximum size for memory storage on any given `cmark_strbuf` object.
 *
 * This is a "safe" value to prevent unbounded memory growth when
 * parsing arbitrarily large (and potentially malicious) documents.
 *
 * It is currently set to 32mb, which is a reasonable default for
 * production applications. If you need to parse documents larger than
 * that, you can increase this value up to `SSIZE_MAX / 2` (which in
 * practice resolves to 1/4th of the total address space for the program).
 *
 * Anything larger than that is a security threat and hence static checks
 * will prevent CMark from compiling.
 */
#define BUFSIZE_MAX (32 * 1024 * 1024)

/**
 * Initialize a cmark_strbuf structure.
 *
 * For the cases where GH_BUF_INIT cannot be used to do static
 * initialization.
 */
void cmark_strbuf_init(cmark_strbuf *buf, bufsize_t initial_size);

/**
 * Grow the buffer to hold at least `target_size` bytes.
 */
bool cmark_strbuf_grow(cmark_strbuf *buf, bufsize_t target_size);

void cmark_strbuf_free(cmark_strbuf *buf);
void cmark_strbuf_swap(cmark_strbuf *buf_a, cmark_strbuf *buf_b);

bufsize_t cmark_strbuf_len(const cmark_strbuf *buf);

int cmark_strbuf_cmp(const cmark_strbuf *a, const cmark_strbuf *b);

unsigned char *cmark_strbuf_detach(cmark_strbuf *buf);
void cmark_strbuf_copy_cstr(char *data, bufsize_t datasize,
                            const cmark_strbuf *buf);

static CMARK_INLINE const char *cmark_strbuf_cstr(const cmark_strbuf *buf) {
  return (char *)buf->ptr;
}

#define cmark_strbuf_at(buf, n) ((buf)->ptr[n])

void cmark_strbuf_set(cmark_strbuf *buf, const unsigned char *data,
                      bufsize_t len);
void cmark_strbuf_sets(cmark_strbuf *buf, const char *string);
void cmark_strbuf_putc(cmark_strbuf *buf, int c);
void cmark_strbuf_put(cmark_strbuf *buf, const unsigned char *data,
                      bufsize_t len);
void cmark_strbuf_puts(cmark_strbuf *buf, const char *string);
void cmark_strbuf_clear(cmark_strbuf *buf);

bufsize_t cmark_strbuf_strchr(const cmark_strbuf *buf, int c, bufsize_t pos);
bufsize_t cmark_strbuf_strrchr(const cmark_strbuf *buf, int c, bufsize_t pos);
void cmark_strbuf_drop(cmark_strbuf *buf, bufsize_t n);
void cmark_strbuf_truncate(cmark_strbuf *buf, bufsize_t len);
void cmark_strbuf_rtrim(cmark_strbuf *buf);
void cmark_strbuf_trim(cmark_strbuf *buf);
void cmark_strbuf_normalize_whitespace(cmark_strbuf *s);
void cmark_strbuf_unescape(cmark_strbuf *s);

#ifdef __cplusplus
}
#endif

#endif