Errors in linked list implementation

[Givisi]

Hello all!

I am a completly newbie at C and I dont have good basis from Java so I cant get the linked lists part from C. I am trying to run the code from the function that is written at the end of this message but it has run-time errors so its hard to find the bugs. I really know that my logic is not so good since I cant understand that bit so well. I am using dm compiler. Could somebody possibly tell me what my mistakes are.

Thank you very much,

Vanessa.

/**********header file******/
 
/* Header files. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
 
/* Constants. */
#define TITLE_LEN 40
#define AUTHOR_LEN 15
#define REPORT_FILE "report.txt"
#define RESTOCK_LEVEL 5
#define SIZE 100
 
 
typedef struct saleStruct {
   int year, month, day;
   int quantity;
   float price;
   struct saleStruct* next;
} SaleType;
 
typedef struct bookStruct {
   int id;
   char title[TITLE_LEN + 1];
   char author[AUTHOR_LEN + 1];
   int year;
   float price;
   int count;
   int saleCount;
   SaleType* head;
   struct bookStruct* next;
} BookType;
 
typedef struct bookListStruct {
   BookType* head;
   int count;
} BookListType;
 
/*******function to load data***************/
 
void loadData(BookListType* booklist, char* booksFile, char* salesFile) {
 
    FILE *bp,*sp;
    char line[SIZE],*date,*title,*author,*result=NULL,*result2=NULL,delims[]=":";
    float bprice,sprice;
    int i,id,year,count,y,m,d,quantity;
 
    BookType *newBook,*preB,*currB,*current;
    SaleType *newSale,*currSale;
 
    if((bp=fopen(booksFile,"r"))==NULL){
        printf("Error openning %s\n - Exiting...",booksFile);
        exit(0);
 
    }
        while((fgets(line, SIZE-1, bp))!= NULL ) {
 
                line[strlen(line) - 1] = '\0';
            //    printf("Strlen(line):%d\n",strlen(line));
            //    printf("%s\n",line);
 
                result=strtok(line,delims);
                id = atoi(result);
                result=strtok(NULL,delims);
                title = result;
                result=strtok(NULL,delims);
                author = result;
                result=strtok(NULL,delims);
                year = atoi(result);
                result=strtok(NULL,delims);
                bprice = atof(result);
                result=strtok(NULL,delims);
                count= atoi(result);
                result=strtok(NULL,delims);
 
            //    printf("%d\t %s\t%s",id,title,author);
            //    printf("%d %f %d\n",year,bprice,count);
 
 
                if((newBook=malloc(sizeof(BookType)))==NULL) {
                 printf("malloc unsuccesfull for BookType - Exiting\n");
                 exit(0);
                }
 
 
                newBook->id = id;
                strcpy(newBook->title, title);
                strcpy(newBook->author, author);
                newBook->year=year;
                newBook->price=bprice;
                newBook->count=count;
 
            /*    newBook->next=booklist->head;
                booklist->head=newBook;
                booklist->count+=1;*/
 
 
                preB=NULL;
                currB=booklist->head;
                 while(currB != NULL) {
                 preB = currB;
                 currB = currB->next;
                 }
                 if(preB == NULL) {
                  booklist->head = newBook;
                 } 
                 else {
                 preB->next = newBook;
                 }
 
        }
    fclose(bp);
 
    if((sp=fopen(salesFile,"r"))==NULL){
        printf("Error openning %s\n - Exiting...",salesFile);
        exit(0);
    }
 
    while((fgets(line,SIZE-1,sp))!=NULL){
 
                line[strlen(line) - 1] = '\0';
 
                result=strtok(line,delims);
                id = atoi(result);
                result=strtok(NULL,delims);
                date=result;
                result=strtok(NULL,delims);
                sprice = atof(result);
                result=strtok(NULL,delims);
                quantity =atoi(result);
                result=strtok(NULL,delims);
 
                result2=strtok(date,"/");
                d=atoi(result2);
                result2=strtok(NULL,"/");
                m=atoi(result2);
                result2=strtok(NULL,"/");
                y=atoi(result2);
                result2=strtok(NULL,"/");
 
 
            //    printf("id: %d\nd: %d\nm: %d\ny: %d\nprice: %f\nquantity: %d",id,d,m,y,sprice,quantity);
 
 
            if((newSale=malloc(sizeof(SaleType)))==NULL) {
             printf("malloc unsuccesfull for SaleType - Exiting\n");
              exit(0);
            }
 
 
                current=booklist->head;
 
            //    while(current!=NULL){        
 
                 if(current->id==id){
                    newSale->year=y;
                    newSale->month=m;
                    newSale->day=d;
                    newSale->price=sprice;
                    newSale->quantity=quantity;
 
                    newSale->next=currB->head;
                    current->head=newSale;
                    printf("Year of sale %d\tId  %d\t%s\n",newBook->head->year,id,newBook->title);
                    current->saleCount+=1;
                    booklist->count+=1;
                    printf("Sale count %d\n",current->saleCount);
 
                }
                current=current->next;
                //}
 
 
     }fclose(sp);
 
}

[sicarie]

I'm betting your compiler already told you where the mistakes were. The output is cryptic, but usually useful. Can you post the compiler's error messages?

PS - Please use code tags in the future - especially on large blocks of code like that.

Thanks!