thodg/libgit2/src/errors.c

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• Hash : f78f6bd5
  Author :
  Date : 2020-01-18T18:00:39
  

  error functions: return an int Stop returning a void for functions, future-proofing them to allow them to fail.

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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",
  	GIT_ERROR_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 git_error_set_oom(void)
  {
  	GIT_GLOBAL->last_error = &g_git_oom_error;
  }
  
  void git_error_set(int error_class, const char *fmt, ...)
  {
  	va_list ap;
  
  	va_start(ap, fmt);
  	git_error_vset(error_class, fmt, ap);
  	va_end(ap);
  }
  
  void git_error_vset(int error_class, const char *fmt, va_list ap)
  {
  #ifdef GIT_WIN32
  	DWORD win32_error_code = (error_class == GIT_ERROR_OS) ? GetLastError() : 0;
  #endif
  	int error_code = (error_class == GIT_ERROR_OS) ? errno : 0;
  	git_buf *buf = &GIT_GLOBAL->error_buf;
  
  	git_buf_clear(buf);
  	if (fmt) {
  		git_buf_vprintf(buf, fmt, ap);
  		if (error_class == GIT_ERROR_OS)
  			git_buf_PUTS(buf, ": ");
  	}
  
  	if (error_class == GIT_ERROR_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);
  }
  
  int git_error_set_str(int error_class, const char *string)
  {
  	git_buf *buf = &GIT_GLOBAL->error_buf;
  
  	assert(string);
  
  	if (!string) {
  		git_error_set(GIT_ERROR_INVALID, "unspecified caller error");
  		return -1;
  	}
  
  	git_buf_clear(buf);
  	git_buf_puts(buf, string);
  
  	if (git_buf_oom(buf))
  		return -1;
  
  	set_error_from_buffer(error_class);
  	return 0;
  }
  
  void git_error_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 *git_error_last(void)
  {
  	return GIT_GLOBAL->last_error;
  }
  
  int git_error_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);
  	}
  
  	git_error_clear();
  	return error_code;
  }
  
  int git_error_state_restore(git_error_state *state)
  {
  	int ret = 0;
  
  	git_error_clear();
  
  	if (state && state->error_msg.message) {
  		if (state->oom)
  			git_error_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 git_error_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 git_error_system_last(void)
  {
  #ifdef GIT_WIN32
  	return GetLastError();
  #else
  	return errno;
  #endif
  }
  
  void git_error_system_set(int code)
  {
  #ifdef GIT_WIN32
  	SetLastError(code);
  #else
  	errno = code;
  #endif
  }
  
  /* Deprecated error values and functions */
  
  const git_error *giterr_last(void)
  {
  	return git_error_last();
  }
  
  void giterr_clear(void)
  {
  	git_error_clear();
  }
  
  void giterr_set_str(int error_class, const char *string)
  {
  	git_error_set_str(error_class, string);
  }
  
  void giterr_set_oom(void)
  {
  	git_error_set_oom();
  }
  

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