error.c - third_party/github.com/GNOME/libxml2 - Git at Google

 /*
  * error.c: module displaying/handling XML parser errors
  *
  * See Copyright for the status of this software.
  *
  * Daniel Veillard <daniel@veillard.com>
  */

 #define IN_LIBXML
 #include "libxml.h"

 #include <stdarg.h>
 #include <libxml/parser.h>
 #include <libxml/xmlerror.h>
 #include <libxml/xmlmemory.h>
 #include <libxml/globals.h>

 void xmlGenericErrorDefaultFunc	(void *ctx ATTRIBUTE_UNUSED,
 				 const char *msg,
 				 ...);

 #define XML_GET_VAR_STR(msg, str) {				\
     int       size;						\
     int       chars;						\
     char      *larger;						\
     va_list   ap;						\
 								\
     str = (char *) xmlMalloc(150);				\
     if (str == NULL) 						\
 	return;							\
 								\
     size = 150;							\
 								\
     while (1) {							\
 	va_start(ap, msg);					\
   	chars = vsnprintf(str, size, msg, ap);			\
 	va_end(ap);						\
 	if ((chars > -1) && (chars < size))			\
 	    break;						\
 	if (chars > -1)						\
 	    size += chars + 1;					\
 	else							\
 	    size += 100;					\
 	if ((larger = (char *) xmlRealloc(str, size)) == NULL) {\
 	    xmlFree(str);					\
 	    return;						\
 	}							\
 	str = larger;						\
     }								\
 }

 /************************************************************************
  * 									*
  * 			Handling of out of context errors		*
  * 									*
  ************************************************************************/

 /**
  * xmlGenericErrorDefaultFunc:
  * @ctx:  an error context
  * @msg:  the message to display/transmit
  * @...:  extra parameters for the message display
  *
  * Default handler for out of context error messages.
  */
 void
 xmlGenericErrorDefaultFunc(void *ctx ATTRIBUTE_UNUSED, const char *msg, ...) {
     va_list args;

     if (xmlGenericErrorContext == NULL)
 	xmlGenericErrorContext = (void *) stderr;

     va_start(args, msg);
     vfprintf((FILE *)xmlGenericErrorContext, msg, args);
     va_end(args);
 }

 /**
  * initGenericErrorDefaultFunc:
  * @handler:  the handler
  *
  * Set or reset (if NULL) the default handler for generic errors
  * to the builtin error function.
  */
 void
 initGenericErrorDefaultFunc(xmlGenericErrorFunc * handler)
 {
     if (handler == NULL)
         xmlGenericError = xmlGenericErrorDefaultFunc;
     else
         (*handler) = xmlGenericErrorDefaultFunc;
 }

 /**
  * xmlSetGenericErrorFunc:
  * @ctx:  the new error handling context
  * @handler:  the new handler function
  *
  * Function to reset the handler and the error context for out of
  * context error messages.
  * This simply means that @handler will be called for subsequent
  * error messages while not parsing nor validating. And @ctx will
  * be passed as first argument to @handler
  * One can simply force messages to be emitted to another FILE * than
  * stderr by setting @ctx to this file handle and @handler to NULL.
  */
 void
 xmlSetGenericErrorFunc(void *ctx, xmlGenericErrorFunc handler) {
     xmlGenericErrorContext = ctx;
     if (handler != NULL)
 	xmlGenericError = handler;
     else
 	xmlGenericError = xmlGenericErrorDefaultFunc;
 }

 /************************************************************************
  * 									*
  * 			Handling of parsing errors			*
  * 									*
  ************************************************************************/

 /**
  * xmlParserPrintFileInfo:
  * @input:  an xmlParserInputPtr input
  *
  * Displays the associated file and line informations for the current input
  */

 void
 xmlParserPrintFileInfo(xmlParserInputPtr input) {
     if (input != NULL) {
 	if (input->filename)
 	    xmlGenericError(xmlGenericErrorContext,
 		    "%s:%d: ", input->filename,
 		    input->line);
 	else
 	    xmlGenericError(xmlGenericErrorContext,
 		    "Entity: line %d: ", input->line);
     }
 }

 /**
  * xmlParserPrintFileContext:
  * @input:  an xmlParserInputPtr input
  *
  * Displays current context within the input content for error tracking
  */

 void
 xmlParserPrintFileContext(xmlParserInputPtr input) {
     const xmlChar *cur, *base;
     unsigned int n, col;	/* GCC warns if signed, because compared with sizeof() */
     xmlChar  content[81]; /* space for 80 chars + line terminator */
     xmlChar *ctnt;

     if (input == NULL) return;
     cur = input->cur;
     base = input->base;
     /* skip backwards over any end-of-lines */
     while ((cur > base) && ((*(cur) == '\n') || (*(cur) == '\r'))) {
 	cur--;
     }
     n = 0;
     /* search backwards for beginning-of-line (to max buff size) */
     while ((n++ < (sizeof(content)-1)) && (cur > base) &&
     	   (*(cur) != '\n') && (*(cur) != '\r'))
         cur--;
     if ((*(cur) == '\n') || (*(cur) == '\r')) cur++;
     /* calculate the error position in terms of the current position */
     col = input->cur - cur;
     /* search forward for end-of-line (to max buff size) */
     n = 0;
     ctnt = content;
     /* copy selected text to our buffer */
     while ((*cur != 0) && (*(cur) != '\n') &&
     	   (*(cur) != '\r') && (n < sizeof(content)-1)) {
 		*ctnt++ = *cur++;
 	n++;
     }
     *ctnt = 0;
     /* print out the selected text */
     xmlGenericError(xmlGenericErrorContext,"%s\n", content);
     /* create blank line with problem pointer */
     n = 0;
     ctnt = content;
     /* (leave buffer space for pointer + line terminator) */
     while ((n<col) && (n++ < sizeof(content)-2) && (*ctnt != 0)) {
 	if (*(ctnt) != '\t')
 	    *(ctnt) = ' ';
 	*ctnt++;
     }
     *ctnt++ = '^';
     *ctnt = 0;
     xmlGenericError(xmlGenericErrorContext,"%s\n", content);
 }

 #if 0
 /**
  * xmlGetVarStr:
  * @msg:  the message format
  * @args:  a va_list argument list
  *
  * SGS contribution
  * Get an arbitrary-sized string for an error argument
  * The caller must free() the returned string
  */
 static char *
 xmlGetVarStr(const char * msg, va_list args) {
     int       size;
     int       length;
     int       chars, left;
     char      *str, *larger;
     va_list   ap;

     str = (char *) xmlMalloc(150);
     if (str == NULL)
       return(NULL);

     size = 150;
     length = 0;

     while (1) {
 	left = size - length;
 		    /* Try to print in the allocated space. */
 	va_start(msg, ap);
   	chars = vsnprintf(str + length, left, msg, ap);
 	va_end(ap);
 			  /* If that worked, we're done. */
 	if ((chars > -1) && (chars < left ))
 	    break;
 			  /* Else try again with more space. */
 	if (chars > -1)         /* glibc 2.1 */
 	    size += chars + 1;  /* precisely what is needed */
 	else                    /* glibc 2.0 */
 	    size += 100;
 	if ((larger = (char *) xmlRealloc(str, size)) == NULL) {
 	    xmlFree(str);
 	    return(NULL);
 	}
 	str = larger;
     }
     return(str);
 }
 #endif

 /**
  * 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);
     }
 }
	/*
	* error.c: module displaying/handling XML parser errors
	*
	* See Copyright for the status of this software.
	*
	* Daniel Veillard <daniel@veillard.com>
	*/

	#define IN_LIBXML
	#include "libxml.h"

	#include <stdarg.h>
	#include <libxml/parser.h>
	#include <libxml/xmlerror.h>
	#include <libxml/xmlmemory.h>
	#include <libxml/globals.h>

	void xmlGenericErrorDefaultFunc (void *ctx ATTRIBUTE_UNUSED,
	const char *msg,
	...);

	#define XML_GET_VAR_STR(msg, str) { \
	int size; \
	int chars; \
	char *larger; \
	va_list ap; \
	\
	str = (char *) xmlMalloc(150); \
	if (str == NULL) \
	return; \
	\
	size = 150; \
	\
	while (1) { \
	va_start(ap, msg); \
	chars = vsnprintf(str, size, msg, ap); \
	va_end(ap); \
	if ((chars > -1) && (chars < size)) \
	break; \
	if (chars > -1) \
	size += chars + 1; \
	else \
	size += 100; \
	if ((larger = (char *) xmlRealloc(str, size)) == NULL) {\
	xmlFree(str); \
	return; \
	} \
	str = larger; \
	} \
	}

	/************************************************************************
	* *
	* Handling of out of context errors *
	* *
	************************************************************************/

	/**
	* xmlGenericErrorDefaultFunc:
	* @ctx: an error context
	* @msg: the message to display/transmit
	* @...: extra parameters for the message display
	*
	* Default handler for out of context error messages.
	*/
	void
	xmlGenericErrorDefaultFunc(void ctx ATTRIBUTE_UNUSED, const char msg, ...) {
	va_list args;

	if (xmlGenericErrorContext == NULL)
	xmlGenericErrorContext = (void *) stderr;

	va_start(args, msg);
	vfprintf((FILE *)xmlGenericErrorContext, msg, args);
	va_end(args);
	}

	/**
	* initGenericErrorDefaultFunc:
	* @handler: the handler
	*
	* Set or reset (if NULL) the default handler for generic errors
	* to the builtin error function.
	*/
	void
	initGenericErrorDefaultFunc(xmlGenericErrorFunc * handler)
	{
	if (handler == NULL)
	xmlGenericError = xmlGenericErrorDefaultFunc;
	else
	(*handler) = xmlGenericErrorDefaultFunc;
	}

	/**
	* xmlSetGenericErrorFunc:
	* @ctx: the new error handling context
	* @handler: the new handler function
	*
	* Function to reset the handler and the error context for out of
	* context error messages.
	* This simply means that @handler will be called for subsequent
	* error messages while not parsing nor validating. And @ctx will
	* be passed as first argument to @handler
	* One can simply force messages to be emitted to another FILE * than
	* stderr by setting @ctx to this file handle and @handler to NULL.
	*/
	void
	xmlSetGenericErrorFunc(void *ctx, xmlGenericErrorFunc handler) {
	xmlGenericErrorContext = ctx;
	if (handler != NULL)
	xmlGenericError = handler;
	else
	xmlGenericError = xmlGenericErrorDefaultFunc;
	}

	/************************************************************************
	* *
	* Handling of parsing errors *
	* *
	************************************************************************/

	/**
	* xmlParserPrintFileInfo:
	* @input: an xmlParserInputPtr input
	*
	* Displays the associated file and line informations for the current input
	*/

	void
	xmlParserPrintFileInfo(xmlParserInputPtr input) {
	if (input != NULL) {
	if (input->filename)
	xmlGenericError(xmlGenericErrorContext,
	"%s:%d: ", input->filename,
	input->line);
	else
	xmlGenericError(xmlGenericErrorContext,
	"Entity: line %d: ", input->line);
	}
	}

	/**
	* xmlParserPrintFileContext:
	* @input: an xmlParserInputPtr input
	*
	* Displays current context within the input content for error tracking
	*/

	void
	xmlParserPrintFileContext(xmlParserInputPtr input) {
	const xmlChar cur, base;
	unsigned int n, col; /* GCC warns if signed, because compared with sizeof() */
	xmlChar content[81]; /* space for 80 chars + line terminator */
	xmlChar *ctnt;

	if (input == NULL) return;
	cur = input->cur;
	base = input->base;
	/* skip backwards over any end-of-lines */
	while ((cur > base) && (((cur) == '\n') \|\| ((cur) == '\r'))) {
	cur--;
	}
	n = 0;
	/* search backwards for beginning-of-line (to max buff size) */
	while ((n++ < (sizeof(content)-1)) && (cur > base) &&
	((cur) != '\n') && ((cur) != '\r'))
	cur--;
	if (((cur) == '\n') \|\| ((cur) == '\r')) cur++;
	/* calculate the error position in terms of the current position */
	col = input->cur - cur;
	/* search forward for end-of-line (to max buff size) */
	n = 0;
	ctnt = content;
	/* copy selected text to our buffer */
	while ((cur != 0) && ((cur) != '\n') &&
	(*(cur) != '\r') && (n < sizeof(content)-1)) {
	ctnt++ = cur++;
	n++;
	}
	*ctnt = 0;
	/* print out the selected text */
	xmlGenericError(xmlGenericErrorContext,"%s\n", content);
	/* create blank line with problem pointer */
	n = 0;
	ctnt = content;
	/* (leave buffer space for pointer + line terminator) */
	while ((n<col) && (n++ < sizeof(content)-2) && (*ctnt != 0)) {
	if (*(ctnt) != '\t')
	*(ctnt) = ' ';
	*ctnt++;
	}
	*ctnt++ = '^';
	*ctnt = 0;
	xmlGenericError(xmlGenericErrorContext,"%s\n", content);
	}

	#if 0
	/**
	* xmlGetVarStr:
	* @msg: the message format
	* @args: a va_list argument list
	*
	* SGS contribution
	* Get an arbitrary-sized string for an error argument
	* The caller must free() the returned string
	*/
	static char *
	xmlGetVarStr(const char * msg, va_list args) {
	int size;
	int length;
	int chars, left;
	char str, larger;
	va_list ap;

	str = (char *) xmlMalloc(150);
	if (str == NULL)
	return(NULL);

	size = 150;
	length = 0;

	while (1) {
	left = size - length;
	/* Try to print in the allocated space. */
	va_start(msg, ap);
	chars = vsnprintf(str + length, left, msg, ap);
	va_end(ap);
	/* If that worked, we're done. */
	if ((chars > -1) && (chars < left ))
	break;
	/* Else try again with more space. */
	if (chars > -1) /* glibc 2.1 */
	size += chars + 1; /* precisely what is needed */
	else /* glibc 2.0 */
	size += 100;
	if ((larger = (char *) xmlRealloc(str, size)) == NULL) {
	xmlFree(str);
	return(NULL);
	}
	str = larger;
	}
	return(str);
	}
	#endif

	/**
	* 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);
	}
	}