core/exception.c

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#include <string.h>
#include "exception.h"
#include "output.h"

EXCEPTIONHANDLER *handlers = NULL;

EXCEPTIONHANDLER *create_exception_handler(void)
{
    EXCEPTIONHANDLER *ptr = malloc(sizeof(EXCEPTIONHANDLER));
    if(ptr == NULL){
        output_fatal("create_exception_handler(): malloc failure");
        return NULL;
    }
    ptr->next = handlers;
    ptr->id = (handlers==NULL?0:handlers->id)+1;
    memset(ptr->msg,0,sizeof(ptr->msg));
    handlers = ptr;
    return ptr;
}

void delete_exception_handler(EXCEPTIONHANDLER *ptr) 
{
    EXCEPTIONHANDLER *target;
    if(ptr == NULL){
        output_fatal("delete_exception_handler(): ending an exception handler block where no exception handler was present");
        return;
    }
    target = ptr->next;
    while (handlers!=target)
    {
        ptr = handlers;
        handlers=ptr->next;
        free(ptr);
        /* if(handlers == NULL) break; */
    }
}

void throw_exception(char *format, 
                     ...) 
{
    char buffer[1024];
    va_list ptr;
    va_start(ptr,format);
    vsprintf(buffer,format,ptr);
    va_end(ptr);

    if (handlers)
    {
        strncpy(handlers->msg,buffer,sizeof(handlers->msg));
        longjmp(handlers->buf,handlers->id);
    }
    else
    {
        output_fatal("unhandled exception: %s", buffer);
        /*  TROUBLESHOOT
            An exception was generated that can't be handled by
            the system.  This usually occurs because some part
            of a module or external library isn't properly
            compiled or linked.
        */
        exit(-1);
    }
}

char *exception_msg(void)
{
    return handlers->msg;
}

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GridLAB-D^TM Version 2.0

An open-source project initiated by the US Department of Energy