How to use fgets() function so that it only reads 12 characters per line?

Question

I have a file that contains the following words:

Theendsherethiswillnotjaksdjlasdfjkl;asdjfklasdjfkl;asdfjl;
these
are
the

Below is my code :

int i = 0;
    bool duplicateFound = false;
        while(fgets(line,12,fp)){
            for (int j = 0; j < i; j++){
                if (strcmp(wordList[j], line) == 0){
                    duplicateFound = true;
                    printf("Duplicate Found on Line %d : %s\n", j, wordList[j]);
                }
            }
            if (duplicateFound == false){
                strcpy(wordList[i], line);
                printf("%s", wordList[i]);
            }
            i++;*/

            printf("%s", line);
        }

I am using line to save each word so that I can later check it for duplicates in the array. I want it so that the function only reads up to 12 characters on each line but it outputs the following output.

ACTUAL OUTPUT :

Theendsherethiswillnotjaksdjlasdfjkl;asdjfklasdjfkl;asdfjl;
these
are
the

EXPECTED OUTPUT:

Theendsheret
these
are
the

Answer 1

You really should just call fgets and then do line[12] = '\0', but that doesn't cleanly deal with input that has long lines. One option is to simply abort if fgets ever returns a partial line (eg, if strchr(line, '\n') returns NULL). If you want to handle long lines, you can just discard data with getchar until you see a newline. Assuming that you don't want to consider the newline to be one of the 12 characters, you could do something like:

#include <stdio.h>
#include <string.h>

int
main(void)
{
        char line[13];
        while( fgets(line, 13, stdin) ) {
                char *c = strchr(line, '\n');
                int ch;
                if( c == NULL ) while( (ch = getchar()) != EOF ) {
                        if( ch == '\n' ) {
                                break;
                        }
                } else {
                        *c = '\0';
                }
                if( printf("%s\n", line) < 0 ) {
                        break;
                }
        }
        return ferror(stdout) || ferror(stdin) || fclose(stdout) || fclose(stdin);
}