thodg/libgit2/src/trace.h

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• Hash : 950a7f76
  Author :
  Date : 2021-07-17T16:21:05
  

  Variadic arguments aren't in C89
  
  This refactors this to a wrapper function, as well as changing the
  existing API have a va_list and ... version.
  

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• src/trace.h

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * 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_trace_h__
  #define INCLUDE_trace_h__
  
  #include "common.h"
  
  #include <git2/trace.h>
  #include "buffer.h"
  
  #ifdef GIT_TRACE
  
  struct git_trace_data {
  	git_trace_level_t level;
  	git_trace_cb callback;
  };
  
  extern struct git_trace_data git_trace__data;
  
  GIT_INLINE(void) git_trace__vwrite_fmt(
  	git_trace_level_t level,
  	const char *fmt, va_list ap)
  {
  	git_trace_cb callback = git_trace__data.callback;
  	git_buf message = GIT_BUF_INIT;
  
  	git_buf_vprintf(&message, fmt, ap);
  
  	callback(level, git_buf_cstr(&message));
  
  	git_buf_dispose(&message);
  }
  
  GIT_INLINE(void) git_trace__write_fmt(
  	git_trace_level_t level,
  	const char *fmt, ...)
  {
  	va_list ap;
  
  	va_start(ap, fmt);
  	git_trace__vwrite_fmt(level, fmt, ap);
  	va_end(ap);
  }
  
  #define git_trace_level()		(git_trace__data.level)
  /* Varadic macros are a C99 feature */
  #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
  #define git_trace(l, ...)		{ \
  									if (git_trace__data.level >= l && \
  										git_trace__data.callback != NULL) { \
  										git_trace__write_fmt(l, __VA_ARGS__); \
  									} \
  								}
  #else
  GIT_INLINE(void) git_trace(git_trace_level_t level, const char *fmt, ...)
  {
  	if (git_trace__data.level >= level &&
  			git_trace__data.callback != NULL) {
  		va_list ap;
  
  		va_start(ap, fmt);
  		git_trace__vwrite_fmt(level, fmt, ap);
  		va_end(ap);
  	}
  }
  #endif
  #else
  
  GIT_INLINE(void) git_trace__null(
  	git_trace_level_t level,
  	const char *fmt, ...)
  {
  	GIT_UNUSED(level);
  	GIT_UNUSED(fmt);
  }
  
  #define git_trace_level()		((git_trace_level_t)0)
  #define git_trace			git_trace__null
  
  #endif
  
  #endif
  

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