首先感谢您花时间阅读并打开它。我基本上完成了这段代码，我相信一切都近乎完美，除了我遇到了分段错误。这是一项家庭作业，但我已经完成了所有的工作，但我知道我的一个 Free() 中有一些东西混在一起，我相信它在我的 Delete() 函数中。
#define TABLE_SIZE 310987 // size of the hash table
#define true 1
#define false 0
static int hash(BOOK *b);
/* Deletes a book with key (b -> isbn) from the table.
If the book is found, it is deleted from the table
and true is returned; If no book with the given isbn
exists, False is returned. *comps holds the number
of comparisons done for this deletion.
*/
void insert(NODE *table[], BOOK x, int *collisionCount){
int i = hash(&x);
NODE *temp;
temp = (NODE *) malloc(sizeof(NODE));
assert(temp != NULL);
temp -> element = x;
temp -> next = table[i];
if(table[i] != NULL) {
*collisionCount += 1;
}
table[i] = temp;
}
boolean delete (NODE *table[], BOOK *b, int *comps){
NODE *current, *previous;
int i = hash(b);
*comps = 0;
current = table[i];
while(current != NULL) {
*comps += 1;
if(strcmp(current -> element.isbn, b -> isbn) == 0) {
if(current == table[i]) {
table[i] = current -> next;
free(current -> element.title);
free(current -> element.author);
free(current -> element.publisher);
free(current);
return true;
}
else {
previous -> next = table[i] -> next;
free(current -> element.title);
free(current -> element.author);
free(current -> element.publisher);
free(current);
}
}
previous = current;
current = current -> next;
}
return false;
}
/* initializes the hash table to an empty table */
void initialize(NODE *table[]){
int i;
for(i = 0; i < TABLE_SIZE; i++) {
table[i] = NULL;
}
}
/* prints one BOOK object to the ouptut file */
void printToFile(const BOOK *b, FILE *fpout) {
fprintf(fpout, "ISBN: %s", b -> isbn);
fprintf(fpout, "ISBN: %s", b -> title);
fprintf(fpout, "ISBN: %s", b -> author);
fprintf(fpout, "ISBN: %d", b -> year);
fprintf(fpout, "ISBN: %s", b -> publisher);
}
/* frees all the memory allocated on the heap */
void freeMemory(NODE * table[]){
NODE *temp;
int i;
for(i = 0; i <= TABLE_SIZE; i++) {
while(table[i] != NULL) {
temp = table[i] -> next;
free(table[i] -> element.title);
free(table[i] -> element.author);
free(table[i] -> element.publisher);
free(table[i]);
table[i] = temp;
}
}
}
我通过终端的 gdb 调试器运行它，我得到了这个：
gdb OpenHashing
(no debugging symbols found)...done.
(gdb) run OpenHashing
Starting program: OpenHashing
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7a9e59c in free ()
(gdb) backtrace
0 0x00007ffff7a9e59c in free ()
1 0x0000000000401889 in freeMemory ()
2 0x00000000004012d4 in main ()
我相信这意味着它在 free() 中，因为这两个数字匹配，但是在 free() 中的哪里不知道如何阅读，有人可以帮忙吗？指点我一个好的可下载调试器？终端机为我指明了正确的方向，但我不确定究竟是哪条线路让我失望，因为我有这么多 free()。
感谢您提供的任何帮助。