C, custom reading from file into struct - c

Question

Can you guys please check this and tell me what am I doing wrong?
I am trying to read from a txt into a struct
The file looks like this: (name on a line, followed by 4 attributes on the next line)
NAME SURNAME OTHER
a1 a2 a4 a3
OTHER ANOTHER
s2 s3 s4 s5
I have to read the file into a struct, then search for a name and print the number of comparisons it took till you found it (the names in the file are alphabetically sorted - I guess binary search is optimal).
Here is what I wrote for now:
*note: I know for certain that the file will have 10000 lines and the full name has at most 40 chars
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct student
{
char name[40];
char arg1[10];
char arg2[10];
char arg3[10];
char arg4[10];
}STUD;
STUD studies[5000];
STUD *ptr = studies;
void readlines(FILE *f)
{
char line[40];
char secondline[40];
int i=0;
while(fgets(line, 40, f) != NULL) //read first line -> here has to be student's name
{
sscanf(line, "%[^\n]%*c\n", studies[i].name); //store first line ->student's name
fgets(secondline, 40, f); //read second line -> here has to be additional information
sscanf(secondline, "%s %s %s %s", studies[i].arg1, studies[i].arg2, studies[i].arg3, studies[i].arg4);
i++;
}
}
void binary_search_string(STUD *arr, char x[])
{
//printf("sizeof: %ld\n", sizeof(arr));
int l=0;
int r = 4999;
int mid;
int compare=0;
while(l <= r)
{
mid = (l + r)/2;
printf("%s\n", studies[mid].name);
if(strcmp(studies[mid].name, x) == 0)
{
compare++;
printf("%d comparisons to find %s\n", compare, x);
break;
}
else
{
if(strcmp(studies[mid].name, x) < 0)
{
compare++;
l = mid + 1;
}
else
{
compare++;
r = mid - 1;
}
}
//printf("compare: %d\n", compare);
}
}
void print(STUD *array)
{
for(int i=0; i<sizeof(array); i++)
{
printf("%s %s %s %s %s\n", studies[i].name, studies[i].arg1, studies[i].arg2, studies[i].arg3, studies[i].arg4);
}
}
int main(int argc, char **argv)
{
if(argc < 2)
{
printf("usage: ./exe file_to_open\n");
exit(-1);
}
FILE *fp = fopen(argv[1], "r");
if(fp == NULL)
{
return 1;
}
char x[]="SURNAME NAME";
readlines(fp);
print(studies);
binary_search_string(studies, x);
fclose(fp);
return 0;
}
Another thing I am not sure about is how would the function "readlines" look like when using the pointer to the array of struct (ptr). (Can you guys give me an example here?)
I am sorry in advance if this is a stupid question.
Thank you!