[lwip-users] Weird behavior of lwIP with C functions

[Louis Filasky]

Hi,

Thanks again everyone for your help so far. Still, the more I feel like I get to understand how lwIP works, the more I encounter some weird problems.
The Virtex II Pro, being the server; receives data from a java client.
The thing is that we have weird behavior. Code that work with Xilinx 9.1 won t work with 8.2 or code that work with dhcp enabled wont work without it.

That includes the use of function such as atoi, strtol, memcpy or sprintf.

I am really confused here, here is the code below. I started it all over again to determine the cause of those crashes. Actually the server works but whenever I send
a command to the server, it will crash/restart the server...

void processCommand(struct pbuf* p,struct tcp_pcb *pcb, struct connection_state *cs) {
         char *commandLine, *commandType, *data1, *data2, *response, *end;
       char* memory =(char*)XPAR_DDR_512MB_64MX64_RANK2_ROW13_COL10_CL2_5_MEM1_BASEADDR;
         long int i;
         char test[10]="1";
         
         //Allocate memory and copy the entire content of the command line received in pbuf->payload:
         commandLine=(char*)malloc((p->tot_len)*sizeof(char));
         sprintf(commandLine, "%s", p->payload);
         //Take care of the garbage after the command line.
         commandLine=strtok(commandLine, "\r\n");
       //Get the command type.
       commandType=strtok(commandLine, " ");
         
         if(strncmp(commandType, "PROC",4)==0) {   
              //If "PROC" type command, only 1 argument is expected:
                data1=strtok(NULL, " ");
                xil_printf("Command Type: %s / %s.\r\n", commandType, data1);
               
                //Send control signal to register 0 of custom logic
              //*(customLogicPtr) = (Xuint8)(atoi(data1));
               xil_printf("Video processing #%s running.\r\n", data1);
                response=(char*)malloc((strlen("PROC command.\n")+1)*sizeof(char));
                sprintf(response, "%s", "PROC command.\n");
         }
         else if(strncmp(commandType, "SEND",4)==0) {
         
               //If "SEND" type command, 2 arguments are expected:
                 data1=strtok(NULL, " ");
               data2=strtok(NULL, " ");
                 xil_printf("Command Type: %s / %s / %s.\r\n", commandType, data1, data2);
                 //Then copy the data at the corresponding address:
                 i=atol(test);
                 xil_printf("Number: %d\r\n", (int)i);
                 //memcpy(memory+i, data2, strlen(data2));
                 //Print information on the server terminal and store the response to be sent to the client:
                 response=(char*)malloc((strlen("youhou\n")+1)*sizeof(char));
                //xil_printf("Data sent to server: %s at address: %s.\r\n",data2,data1);
                 sprintf(response, "%s", "youhou\n");
                 //response[strlen(data2)]='\n';
                 //response[strlen(data2)+1]='\0';      
         }
         
         xil_printf("response: %s\r",response);
         cs->data = "">         cs->left = strlen(response);

         send_data(pcb, cs);

         free(commandLine);
         free(response);
}

Thanks for your help, because I m really starting to be desperate...

Antoine.

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