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Core dump error in code

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# 1  
Old 09-27-2011
Core dump error in code
HI,
I am getting run time error when am trying to compile the following coe can any one please help me
Code:
 while (fgets(strLine, MAX_LINELEN, vobjFile) != NULL && feof(vobjFile) == 0) {
                printf("this is the first loop\n");

                while (strcmp(strLine, "BEGINTRANS\n") != 0) 
                /*printf("this is second loop\n");
                if (fgets(strLine, MAX_LINELEN, vobjFile) == NULL)
                        break;
                if(!feof(vobjFile)) break;*/
                printf("second loop ends");
                while(strcmp(strLine, "ENDTRANS\n") != 0) {
                        printf("third loop\n");

                        _ParseReplyMessage(strLine, &objCountersInMessage);//This is the place iam getting an error
                        printf("this is the end\n");

And the code of this function is

Code:
static void _ParseReplyMessage(const char *vstrLine, CountersInMessage *robjCountersInMessage)
{
        static const char *strRoutine = "_ParseReplyMessage";
        char strHHMMSS[9] = "";
        char *strTransName;
        const char *tsstr;
        char strMSS[5] = "";

        _CountersInMessageInitialize(robjCountersInMessage);
        /*_FindTransactionDetails(vstrLine, &robjFindTransDetail);*/

        if(strstr(vstrLine, "NEWOLUF2") !=0)
                tsstr = strstr( vstrLine, "Input <");
                sscanf( tsstr, "Input <%8s", strTransName);
        strcpy(robjCountersInMessage->strTransactionName, strTransName);

        tsstr=strstr(vstrLine, "Timestamp");
        sscanf(tsstr, "Timestamp <%[^>]>", strHHMMSS);
        robjCountersInMessage->intTimestamp = _ConvertTimestamp(strHHMMSS);
        if (strncmp(vstrLine, "Elapsetime", 10) == 0)
                sscanf( vstrLine, "Elapsetime <%d>",&strMSS);

}

This function is getting the error core dump

Please help me Thanks in advance.

}
Last edited by pludi; 09-27-2011 at 04:35 AM..
# 2  
Old 09-27-2011
Look at the 2 statements below and it would make sense of the runtime error...
Code:
char *strTransName;  // this can hold 1 byte
...
sscanf( tsstr, "Input <%8s", strTransName);  // stuffing 8 bytes into a 1 byte holder??

# 3  
Old 09-28-2011
Data
Getting same error bus error(core dump ) at the same location please help me

Code:
while (fgets(strLine, MAX_LINELEN, vobjFile) != NULL && feof(vobjFile) == 0) {

                /* Only consider STL or BLANK messages */

                if((strcmp(strLine, "BEGINTRANS\n") != 0) && (strcmp(strLine, "ENDTRANS\n") != 0)) {
                                continue;
                        }

                        /* Decode a single line in file LOG.stq.stdout.DDMonYY */
                _ParseReplyMessage(strLine, &objCountersInMessage); //Getting the error here :wall:


And the code of this function is

Code:
static void _ParseReplyMessage(const char *vstrLine, CountersInMessage *robjCountersInMessage)
{
        static const char *strRoutine = "_ParseReplyMessage";
        char strHHMMSS[9] = "";
        char strTransName[100];
        const char *tsstr;
        int intMSS = -1;

        _CountersInMessageInitialize(robjCountersInMessage);
        /*_FindTransactionDetails(vstrLine, &robjFindTransDetail);*/
        printf("Initial stage\n");
        if(strstr(vstrLine, "NEWOLUF2") !=0)
                tsstr = strstr( vstrLine, "Input <");
                sscanf( tsstr, "Input <%8s", &strTransName);
        strcpy(robjCountersInMessage->strTransactionName[LEN_TRANS_NAME], strTransName);

        tsstr=strstr(vstrLine, "Timestamp");
        sscanf(tsstr, "Timestamp <%[^>]>", strHHMMSS);
        robjCountersInMessage->intTimestamp = _ConvertTimestamp(strHHMMSS);
        if (strncmp(vstrLine, "Elapsetime", 10) == 0)
                sscanf( vstrLine, "Elapsetime <%d>", &intMSS);
        robjCountersInMessage->intProcTime = intMSS;
      objCounterInMessage->intProcTime = intMSS;
 }

Please help me in finding it and what is the error means exactly in this programe and y it is coming like this.

Thank you in advance.

Moderator's Comments:
Mod Comment Video tutorial on how to use code tags in The UNIX and Linux Forums.
Last edited by radoulov; 10-06-2011 at 12:37 PM..
# 4  
Old 10-06-2011
Are you getting the error in the call to _ParseReplyMessage, or inside the function itself?

For the former, have you checked objCountersInMessage is not NULL? In the latter, is strHHMMSS always big enough to hold the timestamp?
# 5  
Old 10-06-2011
Quote:
Originally Posted by shamrock
Look at the 2 statements below and it would make sense of the runtime error...
Code:
char *strTransName;  // this can hold 1 byte

Incorrect -- it's a pointer to nowhere in particular, which can store nothing at all.

Try fprintf(stderr, "initial stage\n"); instead of printf("initial stage\n");. The stderr printf will got DIRECTLY to stdout with no buffering. printf() statements that already happened can be lost when your program crashes, but fprintf(stderr, ...); will never trick you that way.
# 6  
Old 11-10-2011
Your code faults:
1) Check all the pointers before using them (specially both the pointers your functions is getting as arguments).
2) Do Must check the strstr() return too; which you have not done; they return null when the pattern is not found but you used without looking at this.

To sum-up do proper error-handling in your code.
Further you can always look at the using gdb with crash dumps; it's easy to find issues.
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