text: #ifndef CMARK_BUFFER_H
  #define CMARK_BUFFER_H
  
  #include <stddef.h>
  #include <stdarg.h>
  #include <string.h>
  #include <limits.h>
  #include <stdint.h>
  #include "config.h"
  #include "cmark.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  typedef struct {
    cmark_mem *mem;
    unsigned char *ptr;
    bufsize_t asize, size;
  } cmark_strbuf;
  
  extern unsigned char cmark_strbuf__initbuf[];
  
  #define CMARK_BUF_INIT(mem)                                                    \
    { mem, cmark_strbuf__initbuf, 0, 0 }
  
  /**
   * Initialize a cmark_strbuf structure.
   *
   * For the cases where CMARK_BUF_INIT cannot be used to do static
   * initialization.
   */
  CMARK_EXPORT
  void cmark_strbuf_init(cmark_mem *mem, cmark_strbuf *buf,
                         bufsize_t initial_size);
  
  /**
   * Grow the buffer to hold at least `target_size` bytes.
   */
  CMARK_EXPORT
  void cmark_strbuf_grow(cmark_strbuf *buf, bufsize_t target_size);
  
  CMARK_EXPORT
  void cmark_strbuf_free(cmark_strbuf *buf);
  
  CMARK_EXPORT
  void cmark_strbuf_swap(cmark_strbuf *buf_a, cmark_strbuf *buf_b);
  
  CMARK_EXPORT
  bufsize_t cmark_strbuf_len(const cmark_strbuf *buf);
  
  CMARK_EXPORT
  int cmark_strbuf_cmp(const cmark_strbuf *a, const cmark_strbuf *b);
  
  CMARK_EXPORT
  unsigned char *cmark_strbuf_detach(cmark_strbuf *buf);
  
  CMARK_EXPORT
  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])
  
  CMARK_EXPORT
  void cmark_strbuf_set(cmark_strbuf *buf, const unsigned char *data,
                        bufsize_t len);
  
  CMARK_EXPORT
  void cmark_strbuf_sets(cmark_strbuf *buf, const char *string);
  
  CMARK_EXPORT
  void cmark_strbuf_putc(cmark_strbuf *buf, int c);
  
  CMARK_EXPORT
  void cmark_strbuf_put(cmark_strbuf *buf, const unsigned char *data,
                        bufsize_t len);
  
  CMARK_EXPORT
  void cmark_strbuf_puts(cmark_strbuf *buf, const char *string);
  
  CMARK_EXPORT
  void cmark_strbuf_clear(cmark_strbuf *buf);
  
  CMARK_EXPORT
  bufsize_t cmark_strbuf_strchr(const cmark_strbuf *buf, int c, bufsize_t pos);
  
  CMARK_EXPORT
  bufsize_t cmark_strbuf_strrchr(const cmark_strbuf *buf, int c, bufsize_t pos);
  
  CMARK_EXPORT
  void cmark_strbuf_drop(cmark_strbuf *buf, bufsize_t n);
  
  CMARK_EXPORT
  void cmark_strbuf_truncate(cmark_strbuf *buf, bufsize_t len);
  
  CMARK_EXPORT
  void cmark_strbuf_rtrim(cmark_strbuf *buf);
  
  CMARK_EXPORT
  void cmark_strbuf_trim(cmark_strbuf *buf);
  
  CMARK_EXPORT
  void cmark_strbuf_normalize_whitespace(cmark_strbuf *s);
  
  CMARK_EXPORT
  void cmark_strbuf_unescape(cmark_strbuf *s);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  