‘ ‘, ‘\n’ , scanf() and output screen

by

First the issue: the default tty mode is canonical, meaning input is made available line by line (see man termios)

Once you fix that, you can use getchar() or read() to get one character at a time. The tty setting, example straight out of the man page of termios .

#include <stdio.h>
#include <termios.h>




int ttySetNoncanonical(int fd, struct termios *prev)
{
    struct termios t;
    if (tcgetattr(fd, &t) == -1)
        return -1;
    if (prev != NULL)
        *prev = t;
    t.c_lflag &= ~ (ICANON);
    t.c_cc[VMIN] = 1; // 1-char at a go
    t.c_cc[VTIME] = 0; // blocking mode
    if (tcsetattr(fd, TCSAFLUSH, &t) == -1)
        return -1;
    return 0;
}



void main(void) {
    printf ("\nType the string without spaces\n");
    ttySetNoncanonical(0,NULL); // set to non-canonical mode
    char X[1000];
    int m, ec=0;
    int i;
    X[0] = 0;
    for (i=0;i<1000;i++) {
        //ec = read(0,X+i,1); // read one char at a time
        m = getchar();
        if(m == EOF || m==' ' || m=='\n') {
            X[i] = 0;
            break;
        }
        X[i] = m;
    }
    printf("You entered %s. Bye.\n\n", X);
}

HTH. You might want to check the boundary condition, in case your user typed in 1000 characters. It works for me on a GNU Linux.

More Related Contents:

  1. isnt everything where it should be, why the segmentation fault?
  2. How do you allow spaces to be entered using scanf?
  3. How to use sscanf in loops?
  4. When should I use ampersand with scanf()
  5. Reading string from input with space character? [duplicate]
  6. Reading a line using scanf() not good?
  7. How to read string from keyboard using C?
  8. What will happen if ‘&’ is not put in a ‘scanf’ statement?
  9. Read no more than size of string with scanf()
  10. Why doesn’t scanf need an ampersand for strings and also works fine in printf (in C)?
  11. Reading a string with spaces with sscanf
  12. Why is adding a leading space in a scanf format string recommended?
  13. Strange character after an array of characters
  14. whitespace in the format string (scanf)
  15. How do you type something on the same line of text in C [closed]
  16. What is the output of the following code in C? [closed]
  17. Why does scanf ask twice for input when there’s a newline at the end of the format string?
  18. Returning string from C function
  19. scanf: “%[^\n]” skips the 2nd input but ” %[^\n]” does not. why?
  20. Code for printf function in C [duplicate]
  21. Going through a text file line by line in C
  22. Print all the permutations of a string in C
  23. C equivalent to fstream’s peek
  24. While-loop ignores scanf the second time
  25. Using scanf and fgets in the same program?
  26. String.indexOf function in C
  27. Why does this code print two times? [duplicate]
  28. Does C have any tools for doing string addition?
  29. How to concatenate string and int in C?
  30. Getting multiple values with scanf()

Leave a Comment