Problem reading a stdin as file in a structured list in C

Basicaly what i want is to read a file in these case im using the stdin as my file FILE *f=stdin;

the files contains something like these

2019 - Frog and Mouse
1982 - Water and gelly
3025 - Sugar
...

I want to be able to read and print the names and the total number of characters of the names

so far i have created a structure and a list

typedef struct struct_data_uc{
    int *uc_number;
	char *uc_name;
} S_data_uc;

typedef struct List_uc_data{
    S_data_uc uc_data;
    struct List_uc_data *next;
} L_uc_data;

L_uc_data* UC_add(L_uc_data *list, L_uc_data data_uc){
	L_uc_data *new;
	new=(L_uc_data*)malloc(sizeof(L_uc_data));
	if(new!=NULL){
		(*new)=data_uc;
		new->next=list;
		return new;
	}
	return list;
}

then i created the functions to read the list and show the results and also ree the list

void UC_free(L_uc_data *list){
	L_uc_data *aux;
	while(list!=NULL){
		aux=list->next;
		free(list);
		list=aux;
	}
}

void UC_read(L_uc_data *data_uc, FILE *fin, FILE *fout){
	char str[MAXSTR];
	if(fout!=NULL)
		fscanf(fin,"%d - %c",&data_uc->uc_data.uc_number,&data_uc->uc_data.uc_name);

void UC_Show(L_uc_data *data_uc, FILE *fout, int prompt){
	if(prompt==0){
		fprintf(fout,"%d - %c\n",
		data_uc->uc_data.uc_number,
		data_uc->uc_data.uc_name);
	}else{
		fprintf(fout,"%d - %c\n",
		data_uc->uc_data.uc_number,
		data_uc->uc_data.uc_name);
		}
}

than my main

int main(){

FILE *f=stdin;
L_uc_data *list=NULL, *i, data_uc;

UC_read(&data_uc, stdin, stdout);
list=UC_add(list,data_uc);

for(i=list;i!=NULL;i=i->next)
	UC_Show(i,f,0);
	
    return 0;
}

but the program wont seems to work, any help?

There are quite a few errors in your code. I've tried to fix without modifying the original code too much. See the comments for details.

typedef struct struct_data_uc{
int uc_number;   // Changed from int *
char *uc_name;
} S_data_uc;
typedef struct List_uc_data{
S_data_uc uc_data;
struct List_uc_data *next;
} L_uc_data;
// Allocate a new L_uc_data and insert into list
L_uc_data* UC_add(L_uc_data *list, int number, const char *name)
{
L_uc_data *new = malloc(sizeof(L_uc_data));
if (new != NULL) {
new->uc_data.uc_number = number;
// Need strdup here to alloc mem and copy
new->uc_data.uc_name = strdup(name);
new->next = list;
return new;
}
return list;
}
// Free the entire list
void UC_free(L_uc_data *list)
{
while (list) {
L_uc_data *aux = list->next;
// Free the mem from strdup
free(list->uc_data.uc_name);
free(list);
list = aux;
}
}
// Reads the entire file and returns a new list
L_uc_data * UC_read(FILE *f)
{
char line[MAXSTR];
L_uc_data *the_list = NULL;
// Using fgets to get the entire line, then sscanf to parse
while (fgets(line, MAXSTR, f)) {
int number;
char name[MAXSTR];
// Remember to check the return from sscanf
if (2 == sscanf(line, "%d - %[^\n]", &number, name)) {
// Add to list
the_list = UC_add(the_list, number, name);
}
}
return the_list;
}
// Print the entire list
void UC_show(L_uc_data *list, FILE *fout)
{
while (list) {
fprintf(fout, "%d - %s\n", list->uc_data.uc_number, list->uc_data.uc_name);
list = list->next;
}
}
int main()
{
L_uc_data *list = UC_read(stdin);
UC_show(list, stdout);
UC_free(list);
return 0;
}

You're making (at least) 2 mistakes. First, you are passing stdin as the argument to UC_Show, where an attempt is made to write to it. 2nd, you are not checking the value returned by printf, which is almost certainly going to indicate an error and set errno to EBADF to tell you exactly what the error is. You cannot write to stdin.