37 lines
790 B
C
37 lines
790 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define USERNAME_LEN 6
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#define NUM_USERS 8
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char logins[NUM_USERS][USERNAME_LEN] = { "user0", "user1", "user2", "user3", "user4", "user5", "user6", "admin" };
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void init() {
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setvbuf(stdout, 0, 2, 0);
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setvbuf(stdin, 0, 2, 0);
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}
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int read_int_lower_than(int bound) {
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int x;
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scanf("%d", &x);
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if(x >= bound) {
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puts("Invalid input!");
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exit(1);
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}
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return x;
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}
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int main() {
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init();
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printf("Select user to log in as: ");
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unsigned short idx = read_int_lower_than(NUM_USERS - 1);
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printf("Logging in as %s\n", logins[idx]);
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if(strncmp(logins[idx], "admin", 5) == 0) {
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puts("Welcome admin.");
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system("/bin/sh");
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} else {
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system("/bin/date");
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}
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}
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