Problem calling a function that uses strtok() inside of a while loop - c

Question

Hi i'm struggling with understanding what's wrong with my program.
My best guess is something related with this line of code here:
scanf("%s", str);
The thing is i'm trying to call a function that uses a strtok on a String passed on to it typed by the user, all of this inside of a while loop as shown in the code example below:
int i = 0;
char str[80];
while(i != 3){
printf("Type in some string so i can break it: ");
scanf("%s", str);
testFunc(str);
printf("Loop %i ended.\n", i);
i++;
}
return 1;
Result (not what i want, see further below what i actually want):
Type in some string so i can break it: hey there how are you doing!
hey
Loop 0 ended.
Type in some string so i can break it:
there
Loop 1 ended.
Type in some string so i can break it:
how
Loop 2 ended.
The reason why i think this is caused by the scanf line is because the program works fine when i'm using instead some dummy pre-declared String
int i = 0;
while(i != 3){
char str[80] = "hey there how are you doing!";
testFunc(str);
printf("Loop %i ended.\n", i);
i++;
}
return 1;
Result:
hey
there
how
are
you
doing!
Loop 0 ended.
hey
there
how
are
you
doing!
Loop 1 ended.
hey
there
how
are
you
doing!
Loop 2 ended.
Here's the funtion that uses strtok, most of the code here is taken from https://www.tutorialspoint.com/c_standard_library/c_function_strtok.htm
int testFunc(char linha[80]){
//
const char s[2] = " ";
char *token;
/* get the first token */
token = strtok(linha, s);
/* walk through other tokens */
while(token != NULL) {
printf("%s\n", token);
token = strtok(NULL, s);
}
return 1;
}
I'm puzzled, it's like the program is executing testFunc() in paralel with the main function.

Answer 1

I think the problem is when you execute this loop:
while(i != 3){
printf("Type in some string so i can break it: ");
scanf("%s", str);
testFunc(str);
printf("Loop %i ended.\n", i);
i++;
}
scanf gets only one word at a time, so the loop cycles 3 times, you only get 3 words no matter how long the input string is.
On the other hand, in your other example you already have a string to break apart so the function will work.
There are different ways to get spaced strings from the console but here is what I consider to be a good option to do it:
str[MAX_SIZE];
fgets(str, MAX_SIZE, stdin);
// where MAX_SIZE is the maximum size you want to allow for the string,
//must be smaller than str.

Answer 2

According to scanf(3) man page:
Matches a sequence of non-white-space characters; the next
pointer must be a pointer to the initial element of a
character array that is long enough to hold the input sequence
and the terminating null byte ('\0'), which is added
automatically. The input string stops at white space or at
the maximum field width, whichever occurs first
You can use fgets or fread for input:
char buffer[1000];
/* fgets (reads a line of text with trailing newline */
fgets (buffer, 1000, stdin);