inputu.c

//
//  inputu.c
//  secrets
//
//  Created by Anders on 10/07/2020.
//

#if defined linux || defined __linux__ || defined __APPLE__
#include <termios.h>
#define UNIX 1
#endif
#include <string.h>
#include "inputu.h"
#include "require.h"

char* input_fgets(char* dest, uint32_t buffer_size, FILE* stream) {
    char* result = fgets(dest, (int) buffer_size, stream);
    
    if (result != NULL) {
        require(result[strlen(result) - 1] == '\n', "input was too big\n");
    }
    
    return result;
}

#ifdef UNIX
char* input_fgets_hidden(char* dest, uint32_t buffer_size, FILE* stream) {
    struct termios old, new;
    
    /* Turn echoing off and fail if we can’t. */
    int echo_on = tcgetattr(fileno (stream), &old);
    require(!echo_on, "failed to turn off echo");
    new = old;
    new.c_lflag &= (tcflag_t) ~ECHO;
    echo_on = tcsetattr (fileno (stream), TCSAFLUSH, &new);
    require(!echo_on, "failed to turn off echo");
    
    char* result = input_fgets(dest, buffer_size, stream);
    
    /* Restore terminal. */
    (void) tcsetattr (fileno (stream), TCSAFLUSH, &old);
     
     return result;
}
#else
//todo
char* input_fgets_hidden(char* result, uint32_t buffer_size, FILE* stream) {
    return input_fgets(result, buffer_size, stream);
}
#endif