local variables values disapearing after calling a function that uses libxml2

Pedro Dinis — Tue, 10 Jul 2007 05:45:56 GMT

what is happening is that i am creating some local variables char * user_txt, and when i call the function streamFileXML(CONFIG_FILE_NAME,ORACLE_BD_TAG,xmlelementos_oracle_bd);
for the first time it returns the values from the xml and fills the variables with the find tag function.

the problem occurs when i call streamFileXML(CONFIG_FILE_NAME,LIMITES_TAG,xmlelementos_limites); a second time but this time i am reading another tag from the xml, it returns the right values, but the value of the local variables char *usr_text;
char *passwd_text;
char *osid_text;
is gone, as you will see in the piece of the log file that i posted below:

before calling the xml reader for the second time :
dados a repetidos: (bdsn), (bdsn), (oesis)

after calling the xml reader function for the second time, these values (bdsn), (bdsn), (oesis) are missing

dados finales: (), (), (), (50)

thanks

elementoestrutura xmlelementos_oracle_bd[BIG_ENOUGH];
elementoestrutura xmlelementos_limites[BIG_ENOUGH];

char *usr_text;
char *passwd_text;
char *osid_text;
char *num_advertencias;

//ler o ficheiro de configuracao e sacar usr,passwd,osid

text_count=0;
LIBXML_TEST_VERSION

streamFileXML(CONFIG_FILE_NAME,ORACLE_BD_TAG,xmlelementos_oracle_bd);

xmlCleanupParser();
xmlMemoryDump();

usr_text=findtag("user",xmlelementos_oracle_bd);
passwd_text=findtag("passwd",xmlelementos_oracle_bd);
osid_text=findtag("osid",xmlelementos_oracle_bd);

sprintf( sstring, "dados a sem ser rep: (%s), (%s), (%s)", usr_text, passwd_text,osid_text);

log_message(LOG_FILE,sstring);
usr_text=findtag("user",xmlelementos_oracle_bd);
passwd_text=findtag("passwd",xmlelementos_oracle_bd);
osid_text=findtag("osid",xmlelementos_oracle_bd);

sprintf( sstring, "dados a repetidos: (%s), (%s), (%s)", usr_text, passwd_text,osid_text);
log_message(LOG_FILE,sstring);

text_count=0;

LIBXML_TEST_VERSION

streamFileXML(CONFIG_FILE_NAME,LIMITES_TAG,xmlelementos_limites);

xmlCleanupParser();
xmlMemoryDump();

num_advertencias=findtag("num_advertencias",xmlelementos_limites);

sprintf( sstring, "dados finales: (%s), (%s), (%s), (%s)",usr_text, passwd_text,osid_text ,num_advertencias);
log_message(LOG_FILE,sstring);

this is the log file created during the execution

[]-pedro:/home/pedro/bin>cat daemon.log
iniciar o daemonize
sprintf : demonio iniciado: Tue Jul 10 12:16:10 2007

lock file
drop user
fork off
fork off
exit parent
executando como filhos
umask
SETSID
CHDIR
el salir daemonize la función
crear la llave
iniciar el semáforo
estoy leyendo el conf.xml por primera vez
Text Count----->0
Text Count----->1
Text Count----->2
Oracle_name----->oracle_bd
entrei aqui
dados elemento==tag : (user)==(user) <<---->> (bdsn)
entrei aqui
dados elemento==tag : (passwd)==(user) <<---->> (bdsn)
dados elemento==tag : (passwd)==(passwd) <<---->> (bdsn)
entrei aqui
dados elemento==tag : (osid)==(user) <<---->> (bdsn)
dados elemento==tag : (osid)==(passwd) <<---->> (bdsn)
dados elemento==tag : (osid)==(osid) <<---->> (oesis)
dados a sem ser rep: (bdsn), (bdsn), (oesis)
entrei aqui
dados elemento==tag : (user)==(user) <<---->> (bdsn)
entrei aqui
dados elemento==tag : (passwd)==(user) <<---->> (bdsn)
dados elemento==tag : (passwd)==(passwd) <<---->> (bdsn)
entrei aqui
dados elemento==tag : (osid)==(user) <<---->> (bdsn)
dados elemento==tag : (osid)==(passwd) <<---->> (bdsn)
dados elemento==tag : (osid)==(osid) <<---->> (oesis)
dados a repetidos: (bdsn), (bdsn), (oesis)
Text Count----->0
Oracle_name----->limites
entrei aqui
dados elemento==tag : (num_advertencias)==(num_advertencias) <<---->> (50)
dados finales: (
), (), (), (50)
vou ficar a escrever na memoria ate que doa a barriga
[]-pedro:/home/pedro/bin>

this is the find tag function that goes to the array that was filled by the xml reader function

char * findtag(char * tag,elementoestrutura xmlelementos[])
{
char sstring[200];
char * texto;
int i =0;

log_message(LOG_FILE,"entrei aqui");
while(i< BIG_ENOUGH)
{

sprintf(sstring, "dados elemento==tag : (%s)==(%s) <<---->> (%s)", tag, xmlelementos[i].elemento,xmlelementos[i].texto);
log_message(LOG_FILE,sstring);
if(strcmp(tag,xmlelementos[i].elemento)==0)
{
texto=xmlelementos[i].texto;
return texto;
}

i++;
}
return "erro no XML";
}

Re: local variables values disapearing after calling a function that uses libxml2

Steven E. Protter — Tue, 10 Jul 2007 05:56:30 GMT

Shalom,

I can't debug your code.

If variables are being stepped on, check the specifications on the library and make sure you are not using names reserved by the library.

sEP

Re: local variables values disapearing after calling a function that uses libxml2

Dennis Handly — Tue, 10 Jul 2007 07:03:01 GMT

What OS version are you on?
If you are on IPF, you can use a real compiler that has +check=bounds +check=stack to catch this type of corruption.

>SEP: If variables are being stepped on,

You can also set a hardware watch point to see who overwrites these variables.

Re: local variables values disapearing after calling a function that uses libxml2

Dennis Handly — Tue, 10 Jul 2007 07:04:57 GMT

Is sstring big enough?
char sstring[200];
sprintf(sstring, "dados elemento==tag : (%s)==(%s) <<---->> (%s)", tag,

You may want to use snprintf, where you pass the size of sstring to prevent it from going out of bounds.

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