thodg/libgit2/src/buffer.h

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• Hash : 309113c9
  Author :
  Date : 2011-11-29T23:45:17
  

  Make initial value of git_buf ptr always be a valid empty string. Taking a page from core git's strbuf, this introduces git_buf_initbuf which is an empty string that is used to initialize the git_buf ptr value even for new buffers. Now the git_buf ptr will always point to a valid NUL-terminated string. This change required jumping through a few hoops for git_buf_grow and git_buf_free to distinguish between a actual allocated buffer and the global initial value. Also, this moves the allocation related functions to be next to each other near the top of buffer.c.

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• src/buffer.h

• /*
   * Copyright (C) 2009-2011 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #ifndef INCLUDE_buffer_h__
  #define INCLUDE_buffer_h__
  
  #include "common.h"
  
  typedef struct {
  	char *ptr;
  	ssize_t asize, size;
  } git_buf;
  
  extern char git_buf_initbuf[];
  
  #define GIT_BUF_INIT { git_buf_initbuf, 0, 0 }
  
  void git_buf_init(git_buf *buf, size_t initial_size);
  int git_buf_grow(git_buf *buf, size_t target_size);
  void git_buf_free(git_buf *buf);
  void git_buf_swap(git_buf *buf_a, git_buf *buf_b);
  
  /**
   * Any function that writes to a git_buf can fail due to memory allocation
   * issues.  If one fails, the git_buf will be marked with an OOM error and
   * further calls to modify the buffer will fail.  You just check
   * git_buf_oom() at the end of your sequence and it will be true if you ran
   * out of memory at any point with that buffer.
   */
  int git_buf_oom(const git_buf *buf);
  
  void git_buf_set(git_buf *buf, const char *data, size_t len);
  void git_buf_sets(git_buf *buf, const char *string);
  void git_buf_putc(git_buf *buf, char c);
  void git_buf_put(git_buf *buf, const char *data, size_t len);
  void git_buf_puts(git_buf *buf, const char *string);
  void git_buf_printf(git_buf *buf, const char *format, ...) GIT_FORMAT_PRINTF(2, 3);
  void git_buf_clear(git_buf *buf);
  void git_buf_consume(git_buf *buf, const char *end);
  void git_buf_join_n(git_buf *buf, char separator, int nbuf, ...);
  void git_buf_join(git_buf *buf, char separator, const char *str_a, const char *str_b);
  
  const char *git_buf_cstr(git_buf *buf);
  char *git_buf_take_cstr(git_buf *buf);
  void git_buf_copy_cstr(char *data, size_t datasize, git_buf *buf);
  
  #define git_buf_PUTS(buf, str) git_buf_put(buf, str, sizeof(str) - 1)
  
  #endif
  

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