error.c

libxml,在UNIX/LINUX下非常重要的一个库,为XML相关应用提供方便.目前上载的是最新版本,若要取得最新版本,请参考里面的readme.

     */
    if (msg == NULL) {
        str = (char *) xmlStrdup(BAD_CAST "No error message provided");
    } else {
        XML_GET_VAR_STR(msg, str);
    }

    /*
     * specific processing if a parser context is provided
     */
    if (ctxt != NULL) {
        if (file == NULL) {
            input = ctxt->input;
            if ((input != NULL) && (input->filename == NULL) &&
                (ctxt->inputNr > 1)) {
                input = ctxt->inputTab[ctxt->inputNr - 2];
            }
            if (input != NULL) {
                file = input->filename;
                line = input->line;
                col = input->col;
            }
        }
        to = &ctxt->lastError;
    } else if ((node != NULL) && (file == NULL)) {
	int i;

	if ((node->doc != NULL) && (node->doc->URL != NULL))
	    baseptr = node;
	for (i = 0;
	     ((i < 10) && (node != NULL) && (node->type != XML_ELEMENT_NODE));
	     i++)
	     node = node->parent;
        if ((baseptr == NULL) && (node != NULL) &&
	    (node->doc != NULL) && (node->doc->URL != NULL))
	    baseptr = node;

	if ((node != NULL) && (node->type == XML_ELEMENT_NODE))
	    line = node->line;
    }

    /*
     * Save the information about the error
     */
    xmlResetError(to);
    to->domain = domain;
    to->code = code;
    to->message = str;
    to->level = level;
    if (file != NULL)
        to->file = (char *) xmlStrdup((const xmlChar *) file);
    else if (baseptr != NULL) {
#ifdef LIBXML_XINCLUDE_ENABLED
	/*
	 * We check if the error is within an XInclude section and,
	 * if so, attempt to print out the href of the XInclude instead
	 * of the usual "base" (doc->URL) for the node (bug 152623).
	 */
        xmlNodePtr prev = baseptr;
	int inclcount = 0;
	while (prev != NULL) {
	    if (prev->prev == NULL)
	        prev = prev->parent;
	    else {
	        prev = prev->prev;
		if (prev->type == XML_XINCLUDE_START) {
		    if (--inclcount < 0)
		        break;
		} else if (prev->type == XML_XINCLUDE_END)
		    inclcount++;
	    }
	}
	if (prev != NULL) {
	    to->file = (char *) xmlGetProp(prev, BAD_CAST "href");
	} else
#endif
	    to->file = (char *) xmlStrdup(baseptr->doc->URL);
	file = to->file;
    }
    to->line = line;
    if (str1 != NULL)
        to->str1 = (char *) xmlStrdup((const xmlChar *) str1);
    if (str2 != NULL)
        to->str2 = (char *) xmlStrdup((const xmlChar *) str2);
    if (str3 != NULL)
        to->str3 = (char *) xmlStrdup((const xmlChar *) str3);
    to->int1 = int1;
    to->int2 = col;
    to->node = node;
    to->ctxt = ctx;

    if (to != &xmlLastError)
        xmlCopyError(to,&xmlLastError);

    /*
     * Find the callback channel if channel param is NULL
     */
    if ((ctxt != NULL) && (channel == NULL) && (xmlStructuredError == NULL) && (ctxt->sax != NULL)) {
        if (level == XML_ERR_WARNING)
	    channel = ctxt->sax->warning;
        else
	    channel = ctxt->sax->error;
	data = ctxt->userData;
    } else if (channel == NULL) {
        if (xmlStructuredError != NULL)
	    schannel = xmlStructuredError;
	else
	    channel = xmlGenericError;
	data = xmlGenericErrorContext;
    }
    if (schannel != NULL) {
        schannel(data, to);
	return;
    }
    if (channel == NULL)
        return;

    if ((channel == xmlParserError) ||
        (channel == xmlParserWarning) ||
	(channel == xmlParserValidityError) ||
	(channel == xmlParserValidityWarning))
	xmlReportError(to, ctxt, str, NULL, NULL);
    else if ((channel == (xmlGenericErrorFunc) fprintf) ||
             (channel == xmlGenericErrorDefaultFunc))
	xmlReportError(to, ctxt, str, channel, data);
    else
	channel(data, "%s", str);
}

/**
 * __xmlSimpleError:
 * @domain: where the error comes from
 * @code: the error code
 * @node: the context node
 * @extra:  extra informations
 *
 * Handle an out of memory condition
 */
void
__xmlSimpleError(int domain, int code, xmlNodePtr node,
                 const char *msg, const char *extra)
{

    if (code == XML_ERR_NO_MEMORY) {
	if (extra)
	    __xmlRaiseError(NULL, NULL, NULL, NULL, node, domain,
			    XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, extra,
			    NULL, NULL, 0, 0,
			    "Memory allocation failed : %s\n", extra);
	else
	    __xmlRaiseError(NULL, NULL, NULL, NULL, node, domain,
			    XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, NULL,
			    NULL, NULL, 0, 0, "Memory allocation failed\n");
    } else {
	__xmlRaiseError(NULL, NULL, NULL, NULL, node, domain,
			code, XML_ERR_ERROR, NULL, 0, extra,
			NULL, NULL, 0, 0, msg, extra);
    }
}
/**
 * xmlParserError:
 * @ctx:  an XML parser context
 * @msg:  the message to display/transmit
 * @...:  extra parameters for the message display
 * 
 * Display and format an error messages, gives file, line, position and
 * extra parameters.
 */
void
xmlParserError(void *ctx, const char *msg, ...)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
    xmlParserInputPtr input = NULL;
    xmlParserInputPtr cur = NULL;
    char * str;

    if (ctxt != NULL) {
	input = ctxt->input;
	if ((input != NULL) && (input->filename == NULL) &&
	    (ctxt->inputNr > 1)) {
	    cur = input;
	    input = ctxt->inputTab[ctxt->inputNr - 2];
	}
	xmlParserPrintFileInfo(input);
    }

    xmlGenericError(xmlGenericErrorContext, "error: ");
    XML_GET_VAR_STR(msg, str);
    xmlGenericError(xmlGenericErrorContext, "%s", str);
    if (str != NULL)
	xmlFree(str);

    if (ctxt != NULL) {
	xmlParserPrintFileContext(input);
	if (cur != NULL) {
	    xmlParserPrintFileInfo(cur);
	    xmlGenericError(xmlGenericErrorContext, "\n");
	    xmlParserPrintFileContext(cur);
	}
    }
}

/**
 * xmlParserWarning:
 * @ctx:  an XML parser context
 * @msg:  the message to display/transmit
 * @...:  extra parameters for the message display
 * 
 * Display and format a warning messages, gives file, line, position and
 * extra parameters.
 */
void
xmlParserWarning(void *ctx, const char *msg, ...)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
    xmlParserInputPtr input = NULL;
    xmlParserInputPtr cur = NULL;
    char * str;

    if (ctxt != NULL) {
	input = ctxt->input;
	if ((input != NULL) && (input->filename == NULL) &&
	    (ctxt->inputNr > 1)) {
	    cur = input;
	    input = ctxt->inputTab[ctxt->inputNr - 2];
	}
	xmlParserPrintFileInfo(input);
    }
        
    xmlGenericError(xmlGenericErrorContext, "warning: ");
    XML_GET_VAR_STR(msg, str);
    xmlGenericError(xmlGenericErrorContext, "%s", str);
    if (str != NULL)
	xmlFree(str);

    if (ctxt != NULL) {
	xmlParserPrintFileContext(input);
	if (cur != NULL) {
	    xmlParserPrintFileInfo(cur);
	    xmlGenericError(xmlGenericErrorContext, "\n");
	    xmlParserPrintFileContext(cur);
	}
    }
}

/************************************************************************
 * 									*
 * 			Handling of validation errors			*
 * 									*
 ************************************************************************/

/**
 * xmlParserValidityError:
 * @ctx:  an XML parser context
 * @msg:  the message to display/transmit
 * @...:  extra parameters for the message display
 * 
 * Display and format an validity error messages, gives file,
 * line, position and extra parameters.
 */
void
xmlParserValidityError(void *ctx, const char *msg, ...)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
    xmlParserInputPtr input = NULL;
    char * str;
    int len = xmlStrlen((const xmlChar *) msg);
    static int had_info = 0;

    if ((len > 1) && (msg[len - 2] != ':')) {
	if (ctxt != NULL) {
	    input = ctxt->input;
	    if ((input->filename == NULL) && (ctxt->inputNr > 1))
		input = ctxt->inputTab[ctxt->inputNr - 2];
		
	    if (had_info == 0) {
		xmlParserPrintFileInfo(input);
	    }
	}
	xmlGenericError(xmlGenericErrorContext, "validity error: ");
	had_info = 0;
    } else {
	had_info = 1;
    }

    XML_GET_VAR_STR(msg, str);
    xmlGenericError(xmlGenericErrorContext, "%s", str);
    if (str != NULL)
	xmlFree(str);

    if ((ctxt != NULL) && (input != NULL)) {
	xmlParserPrintFileContext(input);
    }
}

/**
 * xmlParserValidityWarning:
 * @ctx:  an XML parser context
 * @msg:  the message to display/transmit
 * @...:  extra parameters for the message display
 * 
 * Display and format a validity warning messages, gives file, line,
 * position and extra parameters.
 */
void
xmlParserValidityWarning(void *ctx, const char *msg, ...)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
    xmlParserInputPtr input = NULL;
    char * str;
    int len = xmlStrlen((const xmlChar *) msg);

    if ((ctxt != NULL) && (len != 0) && (msg[len - 1] != ':')) {
	input = ctxt->input;
	if ((input->filename == NULL) && (ctxt->inputNr > 1))
	    input = ctxt->inputTab[ctxt->inputNr - 2];

	xmlParserPrintFileInfo(input);
    }
        
    xmlGenericError(xmlGenericErrorContext, "validity warning: ");
    XML_GET_VAR_STR(msg, str);
    xmlGenericError(xmlGenericErrorContext, "%s", str);
    if (str != NULL)
	xmlFree(str);

    if (ctxt != NULL) {
	xmlParserPrintFileContext(input);
    }
}


/************************************************************************
 *									*
 *			Extended Error Handling				*
 *									*
 ************************************************************************/

/**
 * xmlGetLastError:
 *
 * Get the last global error registered. This is per thread if compiled
 * with thread support.
 *
 * Returns NULL if no error occured or a pointer to the error
 */
xmlErrorPtr
xmlGetLastError(void)
{
    if (xmlLastError.code == XML_ERR_OK)
        return (NULL);
    return (&xmlLastError);
}

/**
 * xmlResetError:
 * @err: pointer to the error.
 *
 * Cleanup the error.
 */
void
xmlResetError(xmlErrorPtr err)
{
    if (err == NULL)
        return;
    if (err->code == XML_ERR_OK)
        return;
    if (err->message != NULL)
        xmlFree(err->message);
    if (err->file != NULL)
        xmlFree(err->file);
    if (err->str1 != NULL)
        xmlFree(err->str1);
    if (err->str2 != NULL)
        xmlFree(err->str2);
    if (err->str3 != NULL)
        xmlFree(err->str3);
    memset(err, 0, sizeof(xmlError));
    err->code = XML_ERR_OK;
}

/**
 * xmlResetLastError:
 *
 * Cleanup the last global error registered. For parsing error
 * this does not change the well-formedness result.
 */
void
xmlResetLastError(void)
{
    if (xmlLastError.code == XML_ERR_OK)
        return;
    xmlResetError(&xmlLastError);
}

/**
 * xmlCtxtGetLastError:
 * @ctx:  an XML parser context
 *
 * Get the last parsing error registered.
 *
 * Returns NULL if no error occured or a pointer to the error
 */
xmlErrorPtr
xmlCtxtGetLastError(void *ctx)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;

    if (ctxt == NULL)
        return (NULL);
    if (ctxt->lastError.code == XML_ERR_OK)
        return (NULL);
    return (&ctxt->lastError);
}

/**
 * xmlCtxtResetLastError:
 * @ctx:  an XML parser context
 *
 * Cleanup the last global error registered. For parsing error
 * this does not change the well-formedness result.
 */
void
xmlCtxtResetLastError(void *ctx)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;

    if (ctxt == NULL)
        return;
    if (ctxt->lastError.code == XML_ERR_OK)
        return;
    xmlResetError(&ctxt->lastError);
}

/**
 * xmlCopyError:
 * @from:  a source error
 * @to:  a target error
 *
 * Save the original error to the new place.
 *
 * Returns 0 in case of success and -1 in case of error.
 */
int
xmlCopyError(xmlErrorPtr from, xmlErrorPtr to) {
    char *message, *file, *str1, *str2, *str3;

    if ((from == NULL) || (to == NULL))
        return(-1);

    message = (char *) xmlStrdup((xmlChar *) from->message);
    file = (char *) xmlStrdup ((xmlChar *) from->file);
    str1 = (char *) xmlStrdup ((xmlChar *) from->str1);
    str2 = (char *) xmlStrdup ((xmlChar *) from->str2);
    str3 = (char *) xmlStrdup ((xmlChar *) from->str3);

    if (to->message != NULL)
        xmlFree(to->message);
    if (to->file != NULL)
        xmlFree(to->file);
    if (to->str1 != NULL)
        xmlFree(to->str1);
    if (to->str2 != NULL)
        xmlFree(to->str2);
    if (to->str3 != NULL)
        xmlFree(to->str3);
    to->domain = from->domain;
    to->code = from->code;
    to->level = from->level;
    to->line = from->line;
    to->node = from->node;
    to->int1 = from->int1;
    to->int2 = from->int2;
    to->node = from->node;
    to->ctxt = from->ctxt;
    to->message = message;
    to->file = file;
    to->str1 = str1;
    to->str2 = str2;
    to->str3 = str3;

    return 0;
}

#define bottom_error
#include "elfgcchack.h"