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