Hi,
Thanks for your reply. I did the size of uid to userName+1. Also my
replace char does reallocate the buffer size to accomodate the
additional chars. Still the behavior I explained remains....the first
time everything works fine, when I try to invoke constructMessage the
second time, I get a segmentation fault. If I do not replace any chars
in the xml string generated by the libxml toolkit, the program doesn't
crash.
BTW Here is my code for replaceChar()
#define LINESIZE 4096
void replaceChar(char** data,char* oldChar,char* newChar)
{
int newStringIndex;
char* nextIndex;
int currIndex;
char newString[LINESIZE];
if((nextIndex=(char *)strstr(*data,oldChar))==NULL)
return;
currIndex=0;
newStringIndex = 0;
while(nextIndex!=NULL)
{
strncpy(newString+newStringIndex,*data+currIndex,(nextIndex-*data)-currInd
ex);
newStringIndex+=(nextIndex-*data)-currIndex;
strncpy(newString+newStringIndex,newChar,strlen(newChar));
newStringIndex+=strlen(newChar);
currIndex = (nextIndex-*data)+strlen(oldChar);
nextIndex = strstr(*data+currIndex,oldChar);
}
strcpy(newString+newStringIndex,*data+currIndex);
*data =(char*)malloc((strlen(newString)+1)*sizeof(char));
strcpy(*data,newString);
free(newString);
free(nextIndex);
}
*/Mark Itzcovitz <mark itzcovitz ntlworld com>/* wrote:
Also xmlDocDumpMemory has told you how big your Message buffer is
and then you make it bigger by translating spaces to %20 (unless
of course replaceChar re-allocates the buffer, but you don't show
that so I don't know).
> _____
>
> From: Ed Day [mailto:eday obj-sys com]
> Sent: 07 October 2003 15:55
> To: XML User; xml gnome org
> Subject: Re: [xml] Segmentation fault - xmlNewDoc
>
>
>
> > Am I missing something?
>
>
>
> Sure, you are only allocating strlen chars for your uid. You
need strlen +
> 1 to account for the null terminator char if you are using strcpy.
>
>
>
> Regards,
>
>
>
> Ed Day
>
>
>
> ----- Original Message -----
>
> From: XML User
>
> To: xml gnome org
>
> Sent: Tuesday, October 07, 2003 10:24 AM
>
> Subject: [xml] Segmentation fault - xmlNewDoc
>
>
>
> Hi,
>
> I am using libXml to create an xml message and pass on the
message to a
> webserver. Since I am sending the message as part of a GET
request, I remove
> all the new line characters from the message. For this I am
using a small
> helper function which removes all new line characters from the
message. My
> problem is that the program works fine the first time, however
if I try to
> construct another xml message I get a segmentation fault. If I
do not do any
> newline character replacements within the xml string, everything
works fine.
>
>
>
> Here is the function I am using
>
>
>
> char* constructMessage(const char *userName,
> const char* responsibility)
> {
> xmlDocPtr doc;
> xmlNodePtr tree, subtree,subsubtree;
> xmlChar* Message;
> int size;
> char* uid;
>
> uid = (char*)malloc(strlen(userName)*sizeof(char));
> strcpy(uid,userName);
> encodeData(&uid);
>
> /*construct Message */
> doc = xmlNewDoc("1.0");
> doc->children = xmlNewDocNode(doc, NULL, "Message", NULL);
> xmlSetProp(doc->children,"MessageId","");
> xmlSetProp(doc->children,"IntObjectFormat","Hierarchical");
> xmlSetProp(doc->children,"MessageType","Integration Object");
> xmlSetProp(doc->children,"IntObjectName","User Registration");
> tree = xmlNewChild(doc->children, NULL,
"Start_UserRegistration", NULL)
> subtree = xmlNewChild(tree, NULL, "UserRegistration", NULL);
> subsubtree = xmlNewChild(subtree, NULL, "FirstName", uid);
> subsubtree = xmlNewChild(subtree, NULL, "LastName", uid);
> subsubtree = xmlNewChild(subtree, NULL, "LoginName", uid);
> subsubtree = xmlNewChild(subtree, NULL,
> "ListOfUserRegistration_Responsibilit
> ", NULL);
> tree = subsubtree;
> subtree = xmlNewChild(tree, NULL, "UserRegistration_Responsibility",
> NULL);
> subsubtree = xmlNewChild(subtree, NULL, "Responsibility",
responsibility);
> xmlDocDumpMemory(doc,&Message,&size);
>
> /*helper function*/
>
> replaceChar(&Message,"\n","");
> replaceChar(&Message," ","%20");
>
> xmlFreeDoc(doc);
> free(uid);
> return (char*)Message;
> }
>
>
>
> Am I missing something?
>
>
>
> Thanks,
>
> Akshay.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> _____
>
>
> Do you Yahoo!?
> The
> > %2Csec%3Amail> New Yahoo! Shopping - with improved product search
-----------------------------------------
Email provided by http://www.ntlhome.com/
------------------------------------------------------------------------
*From:* Ed Day [mailto:eday obj-sys com]
*Sent:* 07 October 2003 15:55
*To:* XML User; xml gnome org
*Subject:* Re: [xml] Segmentation fault - xmlNewDoc
Am I missing something?
Sure, you are only allocating strlen chars for your uid. You need
strlen + 1 to account for the null terminator char if you are
using strcpy.
Regards,
Ed Day
----- Original Message -----
*From:* XML User <mailto:xml_user2003 yahoo com>
*To:* xml gnome org <mailto:xml gnome org>
*Sent:* Tuesday, October 07, 2003 10:24 AM
*Subject:* [xml] Segmentation fault - xmlNewDoc
Hi,
I am using libXml to create an xml message and pass on the
message to a webserver. Since I am sending the message as part
of a GET request, I remove all the new line characters from
the message. For this I am using a small helper function which
removes all new line characters from the message. My problem
is that the program works fine the first time, however if I
try to construct another xml message I get a segmentation
fault. If I do not do any newline character replacements
within the xml string, everything works fine.
Here is the function I am using
char* constructMessage(const char *userName,
const char* responsibility)
{
xmlDocPtr doc;
xmlNodePtr tree, subtree,subsubtree;
xmlChar* Message;
int size;
char* uid;
uid = (char*)malloc(strlen(userName)*sizeof(char));
strcpy(uid,userName);
encodeData(&uid);
/*construct Message */
doc = xmlNewDoc("1.0");
doc->children = xmlNewDocNode(doc, NULL, "Message", NULL);
xmlSetProp(doc->children,"MessageId","");
xmlSetProp(doc->children,"IntObjectFormat","Hierarchical");
xmlSetProp(doc->children,"MessageType","Integration Object");
xmlSetProp(doc->children,"IntObjectName","User Registration");
tree = xmlNewChild(doc->children, NULL,
"Start_UserRegistration", NULL)
subtree = xmlNewChild(tree, NULL, "UserRegistration", NULL);
subsubtree = xmlNewChild(subtree, NULL, "FirstName", uid);
subsubtree = xmlNewChild(subtree, NULL, "LastName", uid);
subsubtree = xmlNewChild(subtree, NULL, "LoginName", uid);
subsubtree = xmlNewChild(subtree, NULL,
"ListOfUserRegistration_Responsibilit
", NULL);
tree = subsubtree;
subtree = xmlNewChild(tree, NULL,
"UserRegistration_Responsibility", NULL);
subsubtree = xmlNewChild(subtree, NULL, "Responsibility",
responsibility);
xmlDocDumpMemory(doc,&Message,&size);
/*helper function*/
replaceChar(&Message,"\n","");
replaceChar(&Message," ","%20");
xmlFreeDoc(doc);
free(uid);
return (char*)Message;
}
Am I missing something?
Thanks,
Akshay.
------------------------------------------------------------------------
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