thodg/libgit2/src/errors.c

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• Hash : 0c7f49dd
  Author :
  Date : 2017-06-30T13:39:01
  

  Make sure to always include "common.h" first Next to including several files, our "common.h" header also declares various macros which are then used throughout the project. As such, we have to make sure to always include this file first in all implementation files. Otherwise, we might encounter problems or even silent behavioural differences due to macros or defines not being defined as they should be. So in fact, our header and implementation files should make sure to always include "common.h" first. This commit does so by establishing a common include pattern. Header files inside of "src" will now always include "common.h" as its first other file, separated by a newline from all the other includes to make it stand out as special. There are two cases for the implementation files. If they do have a matching header file, they will always include this one first, leading to "common.h" being transitively included as first file. If they do not have a matching header file, they instead include "common.h" as first file themselves. This fixes the outlined problems and will become our standard practice for header and source files inside of the "src/" from now on.

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• src/errors.c

• /*
   * 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.
   */
  
  #include "common.h"
  
  #include "global.h"
  #include "posix.h"
  #include "buffer.h"
  
  /********************************************
   * New error handling
   ********************************************/
  
  static git_error g_git_oom_error = {
  	"Out of memory",
  	GITERR_NOMEMORY
  };
  
  static void set_error_from_buffer(int error_class)
  {
  	git_error *error = &GIT_GLOBAL->error_t;
  	git_buf *buf = &GIT_GLOBAL->error_buf;
  
  	error->message = buf->ptr;
  	error->klass = error_class;
  
  	GIT_GLOBAL->last_error = error;
  }
  
  static void set_error(int error_class, char *string)
  {
  	git_buf *buf = &GIT_GLOBAL->error_buf;
  
  	git_buf_clear(buf);
  	if (string) {
  		git_buf_puts(buf, string);
  		git__free(string);
  	}
  
  	set_error_from_buffer(error_class);
  }
  
  void giterr_set_oom(void)
  {
  	GIT_GLOBAL->last_error = &g_git_oom_error;
  }
  
  void giterr_set(int error_class, const char *string, ...)
  {
  	va_list arglist;
  #ifdef GIT_WIN32
  	DWORD win32_error_code = (error_class == GITERR_OS) ? GetLastError() : 0;
  #endif
  	int error_code = (error_class == GITERR_OS) ? errno : 0;
  	git_buf *buf = &GIT_GLOBAL->error_buf;
  
  	git_buf_clear(buf);
  	if (string) {
  		va_start(arglist, string);
  		git_buf_vprintf(buf, string, arglist);
  		va_end(arglist);
  
  		if (error_class == GITERR_OS)
  			git_buf_PUTS(buf, ": ");
  	}
  
  	if (error_class == GITERR_OS) {
  #ifdef GIT_WIN32
  		char * win32_error = git_win32_get_error_message(win32_error_code);
  		if (win32_error) {
  			git_buf_puts(buf, win32_error);
  			git__free(win32_error);
  
  			SetLastError(0);
  		}
  		else
  #endif
  		if (error_code)
  			git_buf_puts(buf, strerror(error_code));
  
  		if (error_code)
  			errno = 0;
  	}
  
  	if (!git_buf_oom(buf))
  		set_error_from_buffer(error_class);
  }
  
  void giterr_set_str(int error_class, const char *string)
  {
  	git_buf *buf = &GIT_GLOBAL->error_buf;
  
  	assert(string);
  
  	if (!string)
  		return;
  
  	git_buf_clear(buf);
  	git_buf_puts(buf, string);
  	if (!git_buf_oom(buf))
  		set_error_from_buffer(error_class);
  }
  
  int giterr_set_regex(const regex_t *regex, int error_code)
  {
  	char error_buf[1024];
  
  	assert(error_code);
  
  	regerror(error_code, regex, error_buf, sizeof(error_buf));
  	giterr_set_str(GITERR_REGEX, error_buf);
  
  	if (error_code == REG_NOMATCH)
  		return GIT_ENOTFOUND;
  
  	return GIT_EINVALIDSPEC;
  }
  
  void giterr_clear(void)
  {
  	if (GIT_GLOBAL->last_error != NULL) {
  		set_error(0, NULL);
  		GIT_GLOBAL->last_error = NULL;
  	}
  
  	errno = 0;
  #ifdef GIT_WIN32
  	SetLastError(0);
  #endif
  }
  
  const git_error *giterr_last(void)
  {
  	return GIT_GLOBAL->last_error;
  }
  
  int giterr_state_capture(git_error_state *state, int error_code)
  {
  	git_error *error = GIT_GLOBAL->last_error;
  	git_buf *error_buf = &GIT_GLOBAL->error_buf;
  
  	memset(state, 0, sizeof(git_error_state));
  
  	if (!error_code)
  		return 0;
  
  	state->error_code = error_code;
  	state->oom = (error == &g_git_oom_error);
  
  	if (error) {
  		state->error_msg.klass = error->klass;
  
  		if (state->oom)
  			state->error_msg.message = g_git_oom_error.message;
  		else
  			state->error_msg.message = git_buf_detach(error_buf);
  	}
  
  	giterr_clear();
  	return error_code;
  }
  
  int giterr_state_restore(git_error_state *state)
  {
  	int ret = 0;
  
  	giterr_clear();
  
  	if (state && state->error_msg.message) {
  		if (state->oom)
  			giterr_set_oom();
  		else
  			set_error(state->error_msg.klass, state->error_msg.message);
  
  		ret = state->error_code;
  		memset(state, 0, sizeof(git_error_state));
  	}
  
  	return ret;
  }
  
  void giterr_state_free(git_error_state *state)
  {
  	if (!state)
  		return;
  
  	if (!state->oom)
  		git__free(state->error_msg.message);
  
  	memset(state, 0, sizeof(git_error_state));
  }
  
  int giterr_system_last(void)
  {
  #ifdef GIT_WIN32
  	return GetLastError();
  #else
  	return errno;
  #endif
  }
  
  void giterr_system_set(int code)
  {
  #ifdef GIT_WIN32
  	SetLastError(code);
  #else
  	errno = code;
  #endif
  }
  

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