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Full Discussion: Masking Password with *'s
Top Forums Programming Masking Password with *'s Post 302480754 by Corona688 on Wednesday 15th of December 2010 05:26:00 PM
Old 12-15-2010
Quote:
Originally Posted by bigdrock44
I'm actually getting the same results as the first code you posted. I was wondering, would getc() and putc() work? I thought getc() didn't echo and I could basically do a loop using getc(stdin) and putc('*', stdout). I could never get it to work though...
It's nothing to do with what function you use because your terminal device is configured to echo and line-buffer. The echoing and buffering isn't happening anywhere in your code -- it happens in the operating system itself. You have to tell it not to do that.

But stdio isn't prepared to read from a raw terminal, since they act rather strange. So, once you change the terminal settings, you need to read from it with a low-level read().
 

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getc(3s)																  getc(3s)

Name
       getc, getchar, fgetc, getw - get character or word from stream

Syntax
       #include <stdio.h>

       int getc(stream)
       FILE *stream;

       int getchar()

       int fgetc(stream)
       FILE *stream;

       int getw(stream)
       FILE *stream;

Description
       The function returns the next character from the named input stream.

       The function is identical to (stdin).

       The function behaves like but is a genuine function, not a macro.  It may be used to save object text.

       The  function returns the next word (in a 32-bit integer on a VAX-11 or MIPS machine) from the named input stream.  It returns the constant
       EOF upon end of file or error, but since that is a good integer value, feof and should be used to check the success of The assumes no  spe-
       cial alignment in the file.

Restrictions
       Because it is implemented as a macro, treats a stream argument with side effects incorrectly.  In particular, `getc(*f++);' doesn't work as
       expected.

Diagnostics
       These functions return the integer constant EOF at end of file or upon read error.

       A stop with message, `Reading bad file', means an attempt has been made to read from a stream that has not been opened for reading by

See Also
       fopen(3s), fread(3s), gets(3s), putc(3s), scanf(3s), ungetc(3s)

																	  getc(3s)
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