From:	"Ben Davis" <ben AT vjpoole DOT freeserve DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: question about password coding
Date:	Tue, 4 Apr 2000 11:39:28 +0100
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References:	<38E92F15 DOT 459B04 AT mindspring DOT com>
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james archer wrote in message <38E92F15 DOT 459B04 AT mindspring DOT com>...
>Anyone happen to have a routine that will let the user enter a password
>with the letters represented by *s, that will send the input to a
>string?

It's not hard to write one. Here is one which will work with getch() and
putch() calls:

/* pw must be at least max_chars+1 bytes (for the null at end)
Returns 0 on success, 1 on failure (if user presses Esc) */
int input_password(char *pw, int max_chars) {
    int l = 0;
    char c, *p = pw;
    *p = 0;
    for (;;) {
        c = getch();
        switch (c) {
            case '\b':
                if (l) {
                    *(--p) = 0;
                    putch('\b');
                    putch(' ');
                    putch('\b');
                }
                break;
            case '\r':
                putch('\r');
                putch('\n');
                return 0;
            case '\e':
                putch('\r');
                putch('\n');
                return 1;
            default:
/* you may want to change this line, depending on what characters are
allowed */
                if (c >= ' ' && c <= '~') {
                    if (l < max_chars) {
                        *(p++) = c;
                        *p = 0;
                        l++;
                        putch('*');
                    }
                }
        }
    }
}

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