Have to take a input string of size 5. Also have to check for validity in some unrelated sense. If the input is not valid user is prompted to input again.
Using the scanf("%4s", input);
But if the user inputs suppose string of 8 characters, the scanf just scans the last 4 chars still in the buffer before asking for actual user input.
I tried making a buffer variable that stores the input before passing it to the target var.
How to prevent buffer overflow when we recursively ask for input if input is not valid?
n characters, (which is n + 1 characters when one counts the Enter or '\n'), read at least a line of at least n + 1 characters. With fgets(), that needs to fit in a buffer of size n + 2. The extra 1 is to store the appended null character.#define STRING_LENGTH_MAX 5
char buf[STRING_LENGTH_MAX + 2];
for (;;) {
if (fgets(buf, sizeof buf, stdin) == NULL) {
// There is no more input from stdin.
// TBD code - perhaps quit?
}
...
'\n'. If found, lop it off and continue. If not found and line is long, read the rest of the line. Discard all and loop back (not recurse) to step 1. buf[strcspn(buf, "\n")] == '\0'; // Lop off a potential '\n'.
if (strlen(buf) <= STRING_LENGTH_MAX) {
// Perform other validation tests on `buf`.
// Otherwise ...
break;
}
// Read and toss rest of line.
int ch;
while ((ch = getchar()) != '\n' && ch != EOF) {
;
}
}