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/*
* Copyright 2008, 2009 University Corporation for Atmospheric Research
*
* This file is part of the UDUNITS-2 package. See the file LICENSE
* in the top-level source-directory of the package for copying and
* redistribution conditions.
*/
/*
* This module is thread-compatible but not thread-safe. Multi-threaded
* access must be externally synchronized.
*/
/*LINTLIBRARY*/
#ifndef _XOPEN_SOURCE
# define _XOPEN_SOURCE 500
#endif
#include <stdarg.h>
#include <stdio.h>
#include "udunits2.h"
/*
* Writes an error-message to the standard-error stream when received and
* appends a newline. This is the initial error-message handler.
*
* Arguments:
* fmt The format for the error-message.
* args The arguments of "fmt".
* Returns:
* <0 A output error was encountered. See "errno".
* else The number of bytes of "fmt" and "arg" written excluding any
* terminating NUL.
*/
int
ut_write_to_stderr(
const char* const fmt,
va_list args)
{
int nbytes = vfprintf(stderr, fmt, args);
(void)fputc('\n', stderr);
return nbytes;
}
/*
* Does nothing with an error-message.
*
* Arguments:
* fmt The format for the error-message.
* args The arguments of "fmt".
* Returns:
* 0 Always.
*/
int
ut_ignore(
const char* const fmt,
va_list args)
{
return 0;
}
static ut_error_message_handler errorMessageHandler = ut_write_to_stderr;
/*
* Returns the previously-installed error-message handler and optionally
* installs a new handler. The initial handler is "ut_write_to_stderr()".
*
* Arguments:
* handler NULL or pointer to the error-message handler. If NULL,
* then the handler is not changed. The
* currently-installed handler can be obtained this way.
* Returns:
* Pointer to the previously-installed error-message handler.
*/
ut_error_message_handler
ut_set_error_message_handler(
ut_error_message_handler handler)
{
ut_error_message_handler prev = errorMessageHandler;
if (handler != NULL)
errorMessageHandler = handler;
return prev;
}
/*
* Handles an error-message.
*
* Arguments:
* fmt The format for the error-message.
* ... The arguments for "fmt".
* Returns:
* <0 An output error was encountered.
* else The number of bytes of "fmt" and "arg" written excluding any
* terminating NUL.
*/
int
ut_handle_error_message(
const char* const fmt,
...)
{
int nbytes;
va_list args;
va_start(args, fmt);
nbytes = errorMessageHandler(fmt, args);
va_end(args);
return nbytes;
}
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