Read from file to linked list C - c

Question

I'm new to the C language, and I'm trying to make a calendar using SDL2, but for some reason my code just skips storing the first data. When I try to return with the "head" of my linked list (which stores structures), some of the data is saved, but some is not. I have a function called linecutter. It should work fine according to my tests. The structure of the file is something like
for some reason the comment part returns correctly. If I printf the location data, it returns correctly, but otherwise it doesn't work as intended.
An examle of a file used:
Prog spec;2020/10/05;2020/11/01;00/00;23/59;Infoc;shouldnt forget it and leave to the last min
something;2020/10/05;2020/11/01;00/00;23/59;location;just a comment
asd asd;2020/2/02;2020/9/01;00/00;23/59;Infoc;lkasjd laksdj
This code should print the event names twice. Once when reading the file, once when checking in the main. But it only prints when reading.
#include <stdio.h>
#include <stdlib.h>
typedef struct Date{
int y;
int m;
int d;
} Date;
typedef struct Time{
int h;
int m;
} Time;
typedef struct Event{
char* name;
Date startdate;
Date enddate;
Time starttime;
Time endtime;
char* location;
char* comment;
} Event;
typedef struct Lista{
Event event;
struct Lista * next;
} Lista;
Date datecreate(char*todate)
{
Date *tmp = (Date *)malloc(sizeof(Date)*1);
int len = strlen(todate);
char date[len];
strcpy(date,todate);
char y[5];
char m[5];
char d[4];
int i =0;
for(; i<4; i++)
y[i] = date[i];
i++;
for(int var = 0; i<7; var++, i++)
{
m[var] = date[i];
}
i++;
for(int var = 0; i<10; var++, i++)
{
d[var] = date[i];
}
tmp->d = atoi(d);
tmp->m = atoi(m);
tmp->y = atoi(y);
return *tmp;
}
Time timecreator(char*totime)
{
Time tmp;
char h[3];
char m[3];
for(int i = 0; i<2; i++)
h[i] = totime[i];
for(int i = 4; i<6; i++)
m[i-4] = totime[i];
h[3] = '\0';
m[3] = '\0';
tmp.h = atoi(h);
tmp.m = atoi(m);
return tmp;
}
Event linecutter(char* line)
{
int i = -1;
int loc = 0;
char name[256], startdate[12],enddate[12],starttime[7],endtime[7],location[256],comment[512];
do{
i++;
name[i] = line[loc];
loc++;
}
while(name[i] !=';');
name[i] = '\0';
i=-1;
do{
i++;
startdate[i] = line[loc];
loc++;
}
while(startdate[i] !=';');
startdate[i] = '\0';
i=-1;
do{
i++;
enddate[i] = line[loc];
loc++;
}
while(enddate[i] !=';');
enddate[i] = '\0';
i=-1;
do{
i++;
starttime[i] = line[loc];
loc++;
}
while(starttime[i] !=';');
starttime[i] = '\0';
i=-1;
do{
i++;
endtime[i] = line[loc];
loc++;
}
while(endtime[i] !=';');
endtime[i] = '\0';
i=-1;
do{
i++;
location[i] = line[loc];
loc++;
}
while(location[i] !=';');
location[i] = '\0';
i=-1;
do{
i++;
comment[i] = line[loc];
loc++;
}
while(comment[i] !='\0');
comment[i] = '\0';
Event tmp;
tmp.name = name;
tmp.location = location;
tmp.comment = comment;
tmp.starttime = timecreator(starttime);
tmp.startdate = datecreate(startdate);
tmp.enddate = datecreate(enddate);
tmp.endtime = timecreator(endtime);
return tmp;
}
Lista * read(void)
{
FILE *fp;
char line[5000];
fp = fopen("esemenyek.txt" , "rw+");
if(fp == NULL) {
perror("error opening");
return NULL;
}
char buf[3];
fscanf(fp, "%3c", buf);
if (memcmp(buf, "\xEF\xBB\xBF", 3) != 0) //this is just for the encoding stuff
fseek(fp, 0, SEEK_SET);
/* ... handling the file ... */
Lista * head= NULL;
Lista * current = NULL;
while(fgets(line, sizeof(line), fp)!=NULL){
Lista *node = (Lista*)malloc(sizeof(Lista));
if(node == NULL)
{
perror("error");
return NULL;
}
node->event = linecutter(line);
node->next =NULL;
if(head== NULL){
current = head = node;
} else {
current = current->next= node;
}
for(int i = 0; i<500; i++)
line[i] ='\0';
printf("%s\n", current->event.name);
}
fclose(fp);
return head;
}
int main(void){
Lista * lst = read();
Lista *move;
for (move= lst; move!= NULL; move= move->next)
printf("%s\n", move->event.name);
return 0;
}
What am I doing wrong, or why is this not working? If someone could help me, I'd really appreciate it. I found another post here, it helped me to get here, but I don't know how to proceed from here.