Array of structs only outputs last entry read in C - arrays

Question

I am reading from a file and inserting the read entries into a struct as shown:
typedef struct card
{
unsigned int id;
char* name;
char* cost;
unsigned int converted_cost;
char* type;
char* text;
char* stats;
enum rarity rarity;
} card_t;
int main(int argc, char **argv) {
FILE *input_file;
input_file = fopen(argv[1], "r");
card_t **cards = NULL;
int cardsaccum = 0;
char *buf = NULL;
char *name_duplicate;
size_t bufsiz = 0;
ssize_t result = getline(&buf, &bufsiz, input_file);
while (result > 0)
{
// COPIES BUFFER TO SAVE THE MEMORY ADDRESS
char *stringp = buf;
// ALLOCATES MEMORY
cards = realloc(cards, sizeof(card_t *) * num_entries);
cards[cardsaccum] = malloc(sizeof(card_t));
name_duplicate = strsep(&stringp, "\"");;
cards[cardsaccum]->name = name_duplicate;
cardsaccum++;
num_entries++;
result = getline(&buf, &bufsiz, input_file);
}
for(int i = 0; i < cardsaccum; i++)
{
printf("%s\n",cards[i]->name);
}
// FREEING MEMORY
for(i = 0; i < cardsaccum;i++)
{
free(cards[i]);
}
free(cards);
free(buf);
fclose(input_file);
return 0;
}
The file should be reading the names of Bob, Marley, Frank. However, my output is only printing the last entry read:
Frank
Frank
Frank
Do I have a problem with my allocation of memory or is it something else? Any help is appreciated!

Answer 1

The function getline() calls realloc() internally. As the result, all previous pointers originating from buf like strsep(&stringp, "\"") get invalidated or overwritten.
Note that previous cards[X]->name point to some location inside previous buf.
Make a copy of a string before processing a next line:
cards[cardsaccum]->name = strdup(name_duplicate);
other solution is setting buf back to NULL just before calling getline.