thodg/libgit2/src/buffer.c

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• Hash : c7c30513
  Author :
  Date : 2011-09-05T21:38:56
  

  buffer: add git_buf_consume Moves the content after 'end' to the beginning of the buffer Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

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• src/buffer.c

• #include "buffer.h"
  #include "posix.h"
  #include <stdarg.h>
  
  #define ENSURE_SIZE(b, d) \
  	if ((ssize_t)(d) >= buf->asize && git_buf_grow(b, (d)) < GIT_SUCCESS)\
  		return;
  
  int git_buf_grow(git_buf *buf, size_t target_size)
  {
  	char *new_ptr;
  
  	if (buf->asize < 0)
  		return GIT_ENOMEM;
  
  	if (buf->asize == 0)
  		buf->asize = target_size;
  
  	/* grow the buffer size by 1.5, until it's big enough
  	 * to fit our target size */
  	while (buf->asize < (int)target_size)
  		buf->asize = (buf->asize << 1) - (buf->asize >> 1);
  
  	new_ptr = git__realloc(buf->ptr, buf->asize);
  	if (!new_ptr) {
  		buf->asize = -1;
  		return GIT_ENOMEM;
  	}
  
  	buf->ptr = new_ptr;
  	return GIT_SUCCESS;
  }
  
  int git_buf_oom(const git_buf *buf)
  {
  	return (buf->asize < 0);
  }
  
  void git_buf_putc(git_buf *buf, char c)
  {
  	ENSURE_SIZE(buf, buf->size + 1);
  	buf->ptr[buf->size++] = c;
  }
  
  void git_buf_put(git_buf *buf, const char *data, size_t len)
  {
  	ENSURE_SIZE(buf, buf->size + len);
  	memcpy(buf->ptr + buf->size, data, len);
  	buf->size += len;
  }
  
  void git_buf_puts(git_buf *buf, const char *string)
  {
  	git_buf_put(buf, string, strlen(string));
  }
  
  void git_buf_printf(git_buf *buf, const char *format, ...)
  {
  	int len;
  	va_list arglist;
  
  	ENSURE_SIZE(buf, buf->size + 1);
  
  	while (1) {
  		va_start(arglist, format);
  		len = p_vsnprintf(buf->ptr + buf->size, buf->asize - buf->size, format, arglist);
  		va_end(arglist);
  
  		if (len < 0) {
  			buf->asize = -1;
  			return;
  		}
  
  		if (len + 1 <= buf->asize - buf->size) {
  			buf->size += len;
  			return;
  		}
  
  		ENSURE_SIZE(buf, buf->size + len + 1);
  	}
  }
  
  const char *git_buf_cstr(git_buf *buf)
  {
  	if (buf->size + 1 >= buf->asize && git_buf_grow(buf, buf->size + 1) < GIT_SUCCESS)
  		return NULL;
  
  	buf->ptr[buf->size] = '\0';
  	return buf->ptr;
  }
  
  void git_buf_free(git_buf *buf)
  {
  	free(buf->ptr);
  }
  
  void git_buf_clear(git_buf *buf)
  {
  	buf->size = 0;
  }
  
  void git_buf_consume(git_buf *buf, const char *end)
  {
  	size_t consumed = end - buf->ptr;
  	memmove(buf->ptr, end, buf->size - consumed);
  	buf->size -= consumed;
  }
  

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